handbook
Respiratory
Medicine
2nd Edition
Editors
Paolo Palange
Anita K. Simonds
handbook
R
espir
atory Medicine
The European Respiratory Society (ERS)
Handbook of Respiratory Medicine, now in
its second edition, is a concise, compact and
easy-to-read guide to each of the key areas in
respiratory medicine. Its 18 chapters, written
by clinicians and researchers at the forefront
of the field, explain the structure and function
of the respiratory system, its disorders and
how to treat them.
The Handbook is a must-have for anyone
who intends to remain up to date in the
field, and to have within arm’s reach a
reference that covers everything from the
basics to the latest developments in
respiratory medicine.
Paolo Palange is head of the Pulmonary
Function and Research Unit in the
Department of Clinical Medicine at the
Sapienza University of Rome, and is the
HERMES Director.
Anita Simonds is Consultant in Respiratory &
Sleep Medicine at NIHR Respiratory
Biomedical Research Unit,Royal Brompton &
Harefield NHS Trust, London,
and is the ERS School Chair.
Respiratory
Medicine
2nd Edition
Editors
Paolo Palange
and Anita K. Simonds
PUBLISHED BY
THE EUROPEAN RESPIRATORY SOCIETY
CHIEF EDITORS
Paolo Palange (Rome, Italy)
Anita K. Simonds (London, UK)
ERS STAFF
Alice Bartlett, Matt Broadhead, Neil Bullen, Alyson Cann, Jonathan Hansen,
Sarah Hill, Fiona Marks, Elin Reeves, David Sadler, Claire Turner
© 2013 European Respiratory Society
Design by Claire Turner and Lee Dodd, ERS
Typeset in China by Charlesworth Group
Printed by Charlesworth Press
All material is copyright to the European Respiratory Society.
It may not be reproduced in any way including electronically without the express
permission of the society.
CONTACT, PERMISSIONS AND SALES REQUESTS:
European Respiratory Society, 442 Glossop Road, Sheffield, S10 2PX, UK
Tel: +44 114 2672860 Fax: +44 114 2665064 e-mail: [email protected]
Table of contents
Contributors
xiv
Preface xxix
Get more from this Handbook
xxx
List of abbreviations
xxxi
Chapter 1 – Structure and function of the respiratory system
Genetics
1
Gernot Zissel
Molecular biology of the lung
7
Melanie Königshoff and Oliver Eickelberg
Anatomy of the respiratory system
13
Pallav L. Shah
Respiratory physiology
18
Susan A. Ward
Cytology of the lung
29
Venerino Poletti, Giovanni Poletti, Marco Chilosi and Bruno Murer
Immunology and defence mechanisms
39
Bruno Balbi, Davide Vallese, Alessandro Pitruzzella, Chiara Vicari and
Antonino Di Stefano
Chapter 2 – Signs and symptoms
Cough and sputum
45
Alyn H. Morice
Dyspnoea 51
Chest pain
59
Matthew Hind
Physical examination
61
Martyn R. Partridge
Chapter 3 – Pulmonary function testing
Static and dynamic lung volumes
66
Riccardo Pellegrino and Andrea Antonelli
Respiratory mechanics
72
Daniel Navajas and Ramon Farré
Gas transfer: T
LCOand T
LNO 77J. Mike Hughes
Control of ventilation
82
Brian J. Whipp and Susan A. Ward
Arterial blood gas assessment
87
Paolo Palange, Alessandro Maria Ferazza and Josep Roca
Exercise testing
94
Paolo Palange and Paolo Onorati
Bronchial provocation testing
99
Kai-Håkon Carlsen
Sputum and exhaled breath analysis
103
Patrizia Pignatti, Andrea Zanini, Sabrina Della Patrona, Federico Gumiero,
Francesca Cherubino and Antonio Spanevello
Chapter 4 – Other diagnostic tests
Bronchoscopy 109
Pallav L. Shah
Bronchoalveolar lavage
114
Patricia L. Haslam
Fine-needle biopsy
122
Stefano Gasparini
Medical thoracoscopy/pleuroscopy
124
Robert Loddenkemper
Thoracentesis 128
Emilio Canalis and Mari Carmen Gilavert
Interventional pulmonology
131
Marc Noppen
Chapter 5 – Lung imaging
Chest X-ray and fluoroscopy
136
Walter De Wever
Lung CT and MRI
141
Johny A. Verschakelen
HRCT of the chest
146
Johny A. Verschakelen
Nuclear medicine of the lung
151
Transthoracic ultrasound
154
Florin von Groote-Bidlingmaier, Coenraad F.N. Koegelenberg and
Chris T. Bolliger
Chapter 6 – Lung injury and respiratory failure
Lung injury
159
Bernrd Schönhofer and Christian Karagiannidis
Respiratory failure
162
Nicolino Ambrosino and Fabio Guarracino
NIV in acute respiratory failure
166
Anita K. Simonds
Acute oxygen therapy
171
Anita K. Simonds
Assessment for anaesthesia/surgery
174
Macé M. Schuurmans, Chris T. Bolliger and Annette Boehler
Long-term ventilation
178
Anita K. Simonds
Chapter 7 – Respiratory Infections
Microbiology testing and interpretation
183
Magareta Ieven
Upper respiratory tract infections
190
Gernot Rohde
Infective exacerbations of COPD
194
Pneumonia 199
Mark Woodhead
Hospital-acquired pneumonia
203
Francesco Blasi
Opportunistic infections in the immunocompromised host
207
Thomas Fuehner, Mark Greer, Jens Gottlieb and Tobias Welte
Pneumonia in the immunocompromised host
211
Santiago Ewig
Pleural infection and lung abscess
215
Amelia Clive, Clare Hooper and Nick Maskell
Influenza, pandemics and SARS
222
Wei Shen Lim
Chapter 8 – Tuberculosis
Pulmonary tuberculosis
229
Giovanni Sotigu and Giovanni Battista Migliori
Extrapulmonary tuberculosis
241
Aik Bossink
Tuberculosis in the immunocompromised host
245
Martina Sester
Latent tuberculosis
248
Jean-Pierre Zellweger
Nontuberculous mycobacterial diseases
251
Laboratory diagnosis of mycobacterial infections
255
Claudio Piersimoni
Chapter 9 – Airway diseases
Chronic rhinitis
261
Arnaud Bourdin and Pascal Chanez
Asthma 264
Bianca Beghé, Leonardo M. Fabbri and Paul O’Byrne
Vocal cord dysfunction
274
Adel H. Mansur
Bronchitis 279
Gernot Rohde
Gastro-oesophageal reflux
281
Lieven Dupont
COPD and emphysema
287
Eleni G. Tzortaki and Nikolaos M. Siafakas
Exacerbations of COPD
293
Alexander J. Mackay and Jadwiga A. Wedzicha
Extrapulmonary effects of COPD
300
Yvonne Nussbaumer-Ochsner and Klaus F. Rabe
Pharmacology of asthma and COPD
304
Peter J. Barnes
Bronchiectasis 311
Cystic fibrosis
315
Andrew Bush and Jane C. Davies
Chapter 10 – Occupational and environmental lung
Work-related and occupational asthma
327
Eleftherios Zervas and Mina Gaga
Respiratory diseases caused by acute inhalation of gases, vapours and dusts
332
Benoit Nemery
Hypersensitivity pneumonitis
337
Torben Sigsgaard and Anna Rask-Andersen
Pneumoconiosis 341
Allan F. Henderson
Indoor and outdoor pollution
345
Giovanni Viegi, Marzia Simoni, Sara Maio, Sonia Cerrai, Giuseppe Sarno and
Sandra Baldacci
Smoking-related diseases
352
Yves Martinet and Nathalie Wirth
Treatment of tobacco dependence
357
Luke Clancy and Zubair Kabir
High-altitude disease
361
Yvonne Nussbaumer-Ochsner and Konrad E. Bloch
Diving-related diseases
366
Radiation-induced lung disease
369
Robert P. Coppes and Peter van Luijk
Chapter 11 – Interstitial lung disease
HRCT in the diagnosis of interstitial lung diseases
371
Giovanni Della Casa, Stefania Cerri, Paolo Spagnolo, Pietro Torricelli and
Luca Richeldi
Sarcoidosis 382
Ulrich Costabel
Idiopathic interstitial pneumonias
386
Dario Olivieri, Sara Chiesa and Panagiota Tzani
Eosinophilic diseases
395
Andrew Menzies-Gow
Drug-induced respiratory disease
399
Philippe Camus and Philippe Bonniaud
Chapter 12 – Pulmonary vascular diseases
Pulmonary embolism
411
Massimo Pistolesi
Pulmonary vasculitis
417
Georgios Margaritopoulos and Athol U. Wells
Pulmonary hypertension
422
Chapter 13 – Pleural, mediastinal and chest wall diseases
Pleural effusion
428
Robert Loddenkemper
Pneumothorax and pneumomediastinum
432
Paul Schneider
Mediastinitis 439
Pierre-Emmanuel Falcoz, Nicola Santelmo and Gilbert Massard
Neuromuscular disorders
443
Andrea Vianello
Chest wall disorders
448
Pierre-Emmanuel Falcoz, Nicola Santelmo and Gilbert Massard
Chapter 14 – Thoracic tumours
Pathology and molecular biology of lung cancer
451
Sylvie Lantuéjoul, Lénaïg Mescam-Mancini, Barbara Burroni and
Anne McLeer-Florin
Lung cancer: diagnosis and staging
455
Johan Vansteenkiste, Sofie Derijcke and Inge Hantson
Chemotherapy and molecular biological therapy
460
Amanda Tufman and Rudolf M. Huber
Surgical treatment for lung cancer
466
Gilbert Massard, Nicola Santelmo and Pierre-Emmanuel Falcoz
Radiotherapy for lung cancer
472
Metastatic tumours
477
Elisabeth Quoix
Pleural and chest wall tumours
482
Arnaud Scherpereel
Mediastinal tumours
489
Paul E. Van Schil, Patrick Lauwers and Jeroen M. Hendriks
Chapter 15 – Sleep-related disorders
Obstructive sleep apnoea/hypopnoea syndrome
491
Wilfried De Backer
Central sleep apnoea
498
Konrad E. Bloch and Thomas Brack
Hypoventilation syndromes
503
Jean-François Muir
Chapter 16 – Immunodeficiency/orphan lung disorders
Pulmonary diseases in primary immunodeficiency syndromes
509
Federica Pulvirenti, Cinzia Milito, Maria Anna Digiulio and Isabella Quinti
HIV-related disease
513
Marc C.I. Lipman and Rob F. Miller
Graft versus host diseases
521
Federica Pulvirenti, Cinzia Milito, Maria Anna Digiulio and Isabella Quinti
Amyloidosis 526
Pulmonary alveolar proteinosis
529
Maurizio Luisetti
Adult pulmonary Langerhans’ cell histiocytosis
532
Vincent Cottin, Romain Lazor and Jean-François Cordier
Lymphangioleiomyomatosis 535
Vincent Cottin, Romain Lazor and Jean-François Cordier
Chapter 17 – Pulmonary rehabilitation
Respiratory physiotherapy
539
Julia Bott
Pulmonary rehabilitation
543
Thierry Troosters, Hans Van Remoortel, Daniel Langer, Marc Decramer and
Rik Gosselink
Palliative care
552
Sylvia Hartl
Chapter 18 - Epidemiology
Measuring the occurrence and causation of respiratory diseases
554
Riccardo Pistelli and Isabella Annesi-Maesano
xiv
Contributors
Nicolino Ambrosino
Cardio-Thoracic Dept
University Hospital
Pisa, Italy
[email protected]
Isabella Annesi-Maesano
Université Pierre et Marie Curie –
Paris 6
Medical School Saint-Antoine
UMR S 707: EPAR
Paris, France
[email protected]
Andrea Antonelli
Allergologia e Fisiopatologia
Respiratoria, ASO S. Croce e Carle
Cuneo, Italy
[email protected]
Bruno Balbi
Fondazione Salvatore Maugeri
IRCCS
Veruno, Italy
[email protected]
Sandra Baldacci
Pulmonary Environmental
Epidemiology Unit, Institute of
Clinical Physiology National Research
Council
Pisa, Italy
[email protected]
Peter J. Barnes
National Heart and Lung Institute
Imperial College
London, UK
[email protected]
Bianca Beghé
Section of Respiratory Diseases
Department of Oncology
Haematology and Respiratory
Diseases
University Policlinic of Modena
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Francesco Blasi
Respiratory Medicine Section
Dipartimento Toraco-Polmonare e
Cardiocircolatorio
Università degli Studi di Milano and
IRCCS Fondazione Cà Granda
Milan, Italy
[email protected]
Konrad E. Bloch
Pulmonary Division
University Hospital of Zurich
Zurich, Switzerland
[email protected]
Chief Editors
Paolo Palange
Department of Public Health and
Infectious Diseases
Sapienza University of Rome
Rome, Italy
[email protected]
Authors
Anita K. Simonds
NIHR Respiratory Disease Biomedical
Research Unit
Royal Brompton and Harefield NHS
Foundation Trust
London, UK
xv
Annette Boehler
University Hospital of Zurich
Zurich, Switzerland
[email protected]
Chris T. Bolliger
†Philippe Bonniaud
Department of Pulmonary Medicine
and Intensive Care
CHU Dijon
Dijon, France
[email protected]
Aik Bossink
Diakonessenhuis
Utrecht, the Netherlands
[email protected]
Julia Bott
Virgin Care
Chertsey, UK
[email protected]
Arnaud Bourdin
Department of Respiratory Disease
CHU Arnaud de Villeneuve
Montpellier, France
[email protected]
Thomas Brack
Cantonal Hospital Glarus
Glarus, Switzerland
[email protected]
Barbara Burroni
Département de Pathologie
Pôle de Biologie et de Pathologie
Centre Hospitalier Universitaire A.
Michallon
INSERM U 823 – Institut A. Bonniot
Université J. Fourier
Grenoble, France
[email protected]
Andrew Bush
Imperial College and Royal Brompton
Hospital
London, UK
[email protected]
Philippe Camus
Department of Pulmonary Medicine
and Intensive Care
CHU Dijon
Dijon, France
[email protected]
Emilio Canalis
Thoracic Surgery Service
Hospital Universitari Joan XXIII
IISPV
URV
Tarragona, Spain
[email protected]
Kai-Håkon Carlsen
Institute of Clinical Medicine,
University of Oslo
Dept of Paediatrics, Oslo University
Hospital
Norwegian School of Sport Science
Oslo, Norway
Sonia Cerrai
Pulmonary Environmental
Epidemiology Unit
Institute of Clinical Physiology
National Research Council
Pisa, Italy
[email protected]
Stefania Cerri
Centre for Rare Lung Disease
Dept of Medical and Surgical
Sciences
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Pascal Chanez
Service de Pneumo-Allergologie et
Laboratoire d’Immunologie INSERM
U600
Université de la Méditerranée
AP-HM
Marseille, France
[email protected]
Francesca Cherubino
Pneumology Unit, Fondazione
Salvatore Maugeri
IRCCS
Tradate, Italy
[email protected]
Sara Chiesa
Department of Clinical and
Experimental Medicine
University of Parma
Parma, Italy
[email protected]
xviMarco Chilosi
Department of Pathology
Università di Verona
Veronica, Italy
[email protected]
Luke Clancy
TobaccoFree Research Institute
Ireland
Dublin, Ireland
[email protected]
Amelia Clive
North Bristol Lung Centre
University of Bristol
Bristol, UK
[email protected]
Robert P. Coppes
Depts of Cell Biology and Radiation
Oncology
University Medical Center Groningen
University of Groningen
Groningen, the Netherlands
[email protected]
Jean-François Cordier
Department of Respiratory Diseases
CHU de Lyon
Lyon, France
[email protected]
Ulrich Costabel
Dept of Pneumology and Allergy
Ruhrlandklinik
Essen
Germany
[email protected]
xvii
Vincent Cottin
Department of Respiratory Diseases
CHU de Lyon
Lyon, France
[email protected]
Jane C. Davies
Imperial College and Royal Brompton
Hospital
London, UK
[email protected]
Wilfried De Backer
Dept of Pulmonary Medicine
University of Antwerp
Antwerp, Belgium
[email protected]
Marc Decramer
Respiratory Rehabilitation and
Respiratory Division
University Hospital Leuven
Leuven, Belgium
[email protected]
Giovanni Della Casa
Division of Radiology
Dept of Diagnostic and Imaging
Services
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Sabrina Della Patrona
Pneumology Unit
Fondazione Salvatore Maugeri
IRCCS
Tradate, Italy
[email protected]
Sofie Derijcke
Respiratory Oncology Unit
Dept of Pulmonology
University Hospital Leuven
Leuven, Belgium
[email protected]
Walter De Wever
University Hospitals Leuven
Leuven, Belgium
[email protected]
Maria Anna Digiulio
Dept of Clinical Medicine
Reference Centre for Primary
Immunodeficiencies
Sapienza University of Rome
Rome, Italy
[email protected]
Antonino Di Stefano
Fondazione Salvatore Maugeri
IRCCS
Veruno, Italy
[email protected]
Lieven Dupont
Department of Respiratory Medicine
University Hospital Gasthuisberg
KU Leuven
Leuven, Belgium
[email protected]
Oliver Eickelberg
Comprehensive Pneumology Center,
Ludwig-Maximilians-University and
Helmholtz Zentrum München
Munich, Germany
[email protected]
Santiago Ewig
Thoraxzentrum Ruhrgebiet
Kliniken für Pneumologie und
Infektiologie
Evangelisches Krankenhaus Herne
und Augusta-Kranken-Anstalt
Bochum
Bochum, Germany
[email protected]
Leonardo M. Fabbri
Section of Respiratory Diseases
Department of Oncology
Haematology and Respiratory
Diseases
University Policlinic of Modena
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Pierre-Emmanuel Falcoz
Université Louis Pasteur and
Hôpitaux Universitaires de
Strasbourg
Strasbourg, France
[email protected]
Ramon Farré
Unitat de Biofisica i Bioenginyeria,
Facultat de Medicina, Universitat de
Barcelona
CIBER Enfermedades Respiratorias
Institut de Investigacions
Biomèdiques August Pi Sunyer
Barcelona, Spain
[email protected]
xviii
Alessandro Maria Ferrazza
Dept of Public Health and Infectious
Diseases
Sapienza University of Rome
Rome, Italy
[email protected]
Thomas Fuehner
Dept of Respiratory Medicine
Hanover Medical School
Hanover, Germany
[email protected]
Mina Gaga
Asthma Centre and 7th Respiratory
Medicine Dept
Athens Chest Hospital
Athens, Greece
[email protected]
Stefano Gasparini
Pulmonary Diseases Unit
Dept of Immunoallergic and
Respiratory Diseases
Azienda Ospedaliero-Universitaria
“Ospedali Riuniti”
Ancona, Italy
[email protected]
Mari Carmen Gilavert
Intensive Care Unit
Hospital Universitari Joan XXIII
IISPV
URV
Tarragona, Spain
[email protected]
Rik Gosselink
Faculty of Kinesiology and
Rehabilitation Sciences
Dept of Rehabilitation Sciences
Katholieke Universiteit Leuven
Leuven, Belgium
xix
[email protected]
Jens Gottlieb
Dept of Respiratory Medicine
Hanover Medical School
Hanover, Germany
[email protected]
Mark Greer
Dept of Respiratory Medicine
Hanover Medical School
Hanover, Germany
[email protected]
Fabio Guarracino
Cardio-Thoracic Dept
University Hospital
Pisa, Italy
[email protected]
Federico Gumiero
Department of Clinical and
Experimental Medicine
University of Insubria
Varese, Italy
[email protected]
Inge Hantson
Respiratory Oncology Unit
Dept of Pulmonology
University Hospital Leuven
Leuven, Belgium
[email protected]
Sylvia Hartl
Dept of Respiratory and Critical Care
Otto Wagner Hospital
Vienna, Austria
[email protected]
Patricia L. Haslam
National Heart and Lung Institute
and Royal Brompton Hospital
Imperial College
London, UK
[email protected]
Allan F. Henderson
Norfolk and Norwich University
Hospital
Norwich, UK
[email protected]
Jeroen M. Hendriks
Department of Thoracic and Vascular
Surgery
Antwerp University Hospital
Antwerp, Belgium
[email protected]
Matthew Hind
Royal Brompton Hospital
London, UK
[email protected]
Clare Hooper
Worcestershire Royal Hospital
Worcester, UK
[email protected]
Rudolf M. Huber
Division of Respiratory Medicine
and Thoracic Oncology, Hospitals
of Ludwig-Maximilians-University –
Campus Innenstadt, and Thoracic
Oncology Centre of Munich
Munich, Germany
[email protected]
J. Mike Hughes
National Heart and Lung Institute
Imperial College
London, UK
Marc Humbert
Université Paris-Sud
INSERM U999
Assistance Publique-Hôpitaux de
Paris
Service de Pneumologie
Hôpital Bicêtre
Paris, France
[email protected]
Magareta Ieven
Laboratory of Medical Microbiology,
University Hospital Antwerp,and
Dept of Medical Microbiology,
Vaccine and Infectious Disease
Institute, Faculty of Medicine,
University of Antwerp
Antwerp, Belgium
[email protected]
Zubair Kabir
TobaccoFree Research Institute
Ireland
Dublin, Ireland
[email protected]
Christian Karagiannidis
Abteilung für Pneumologie und
Internistische Intensivmedizin
Krankenhaus Oststadt-Heidehaus
Klinikum Region Hannover
Hanover, Germany
[email protected]
Coenraad F.N. Koegelenberg
Division of Pulmonology
Dept of Medicine
University of Stellenbosch and
Tygerberg Academic Hospital
Cape Town, South Africa
[email protected]
xx
Melanie Königshoff
Comprehensive Pneumology Center
Ludwig-Maximilians-University and
Helmholtz Zentrum München
Munich, Germany
[email protected]
Helen J. Lachmann
UK National Amyloidosis Centre
Division of Medicine
University College London Medical
School
London, UK
[email protected]
Daniel Langer
Faculty of Kinesiology and
Rehabilitation Sciences
Dept of Rehabilitation Sciences
Katholieke Universiteit Leuven
Leuven, Belgium
[email protected]
Sylvie Lantuéjoul
Département de Pathologie
Pôle de Biologie et de Pathologie
Centre Hospitalier Universitaire A.
Michallon
INSERM U 823-Institut A.
Bonniot-Université J. Fourier
Grenoble, France
[email protected]
Patrick Lauwers
Dept of Thoracic and Vascular
Surgery
Antwerp University Hospital
Antwerp, Belgium
xxi
Pierantonio Laveneziana
Equipe de Recherche ER 10 UPMC
Laboratoire de Physio-Pathologie
Respiratoire
Faculté de Médecine Pierre et Marie
Curie
Université Pierre et Marie Curie
(Paris VI)
Paris, France
[email protected]
Romain Lazor
Interstitial and Rare Lung Disease
Unit
Lausanne University Hospital
Lausanne, Switzerland
[email protected]
Wei Shen Lim
Respiratory Medicine
Nottingham University Hospitals
NHS Trust
Nottingham, UK
[email protected]
Marc C.I. Lipman
University College London Medical
School and Royal Free London NHS
Foundation Trust
London, UK
[email protected]
Robert Loddenkemper
Dept of Pneumology II
Lungenklinik Heckeshorn
HELIOS Klinikum Emil von Behring
Berlin, Germany
[email protected]
Maurizio Luisetti
University of Pavia
SC Pneumologia
Dip. di Medicina Molecolare
IRCCS Policlinico San Matteo
Pavia, Italy
[email protected]
Alexander J. Mackay
Academic Unit of Respiratory
Medicine
UCL Medical School
London, UK
[email protected]
Sara Maio
Pulmonary Environmental
Epidemiology Unit
Institute of Clinical Physiology
National Research Council
Pisa, Italy
[email protected]
Adel H. Mansur
Birmingham Heartlands Hospital
Birmingham, UK
[email protected]
Georgios Margaritopoulos
Interstitial Lung Disease Unit
Royal Brompton Hospital
London, UK
[email protected]
Yves Martinet
University of Nancy Henri Poincaré
Nancy, France
Nick Maskell
North Bristol Lung Centre
University of Bristol
Bristol, UK
[email protected]
Gilbert Massard
Dept of Thoracic Surgery
Hôpitaux Universitaires de
Strasbourg
Strasbourg, France
[email protected]
Anne McLeer-Florin
Plateforme de Génétique Moléculaire
des Cancers
Pôle de Biologie et de Pathologie
Centre Hospitalier Universitaire A.
Michallon
INSERM U 823-Institut A.
Bonniot-Université J. Fourier
Grenoble, France
[email protected]
Andrew Menzies-Gow
Royal Brompton and Harefield NHS
Foundation Trust
London, UK
[email protected]
Lénaïg Mescam-Mancini
Département de Pathologie et
Plateforme de Génétique Moléculaire
des Cancers
Pôle de Biologie et de Pathologie
Centre Hospitalier Universitaire A.
Michallon
INSERM U 823-Institut A.
Bonniot-Université J. Fourier
Grenoble, France
[email protected]
xxiiGiovanni Battista Migliori
WHO Collaborating Centre for TB
and Lung Diseases
Fondazione S. Maugeri
Care and Research Institute
Tradate, Italy
[email protected]
Cinzia Milito
Dept of Molecular Medicine
Reference Centre for Primary
Immunodeficiencies
Sapienza University of Rome
Rome, Italy
[email protected]
Rob F. Miller
University College London Medical
School, and London School of
Hygiene and Tropical Medicine
London, UK
[email protected]
Marc Miravitlles
Pneumology Dept
Hospital Universitari Vall d’Hebron
Barcelona, Spain
[email protected]
Luigi Moretti
Dept of Radiation Oncology
Institut Jules Bordet
Université Libre de Bruxelles
Brussels, Belgium
[email protected]
Alyn H. Morice
Hull York Medical School
University of Hull
Hull, UK
xxiii
Jean-François Muir
Respiratory Dept and Respiratory
Intensive Care Unit
Rouen University Hospital
Rouen, France
[email protected]
Bruno Murer
Surgical Pathology Unit
Department of Clinical Pathology
Ospedale dell’Angelo
Venice, Italy
[email protected]
Daniel Navajas
Unitat de Biofisica i Bioenginyeria,
Facultat de Medicina, Universitat
de Barcelona, CIBER Enfermedades
Respiratorias, and Institut de
Bioenginyeria de Catalunya
Barcelona, Spain
[email protected]
Benoit Nemery
Research Unit of Lung Toxicology,
Occupational, Environmental and
Insurance Medicine
KU Leuven
Leuven, Belgium
[email protected]
Marc Noppen
University Hospital Brussels
Brussels, Belgium
[email protected]
Yvonne Nussbaumer-Ochsner
University Hospital Zurich
Zurich, Switzerland
[email protected]
Dario Olivieri
Department of Clinical and
Experimental Medicine
University of Parma
Parma, Italy
[email protected]
Paolo Onorati
Department of Public Health and
Infectious Diseases
Sapienza University of Rome
Rome, Italy
[email protected]
Antonio Palla
Cardiothoracic and Vascular Dept
University of Pisa
Pisa, Italy
[email protected]
Martyn R. Partridge
Imperial College, London, UK and
Lee Kong Chian School of Medicine,
Singapore
[email protected]
Riccardo Pellegrino
Allergologia e Fisiopatologia
Respiratoria
ASO S. Croce e Carle
Cuneo, Italy
[email protected]
Claudio Piersimoni
Regional Reference Mycobacteriology
Unit
Clinical Pathology Laboratory
Azienda Ospedaliera-Universitaria
Ospedali Riuniti
Ancona, Italy
c.piersimoni@ospedaliriuniti.
marche.it
Patrizia Pignatti
Allergy and Immunology Unit
Fondazione Salvatore Maugeri
IRCCS
Pavia, Italy
[email protected]
Massimo Pistolesi
Section of Respiratory Medicine
Dept of Experimental and Clinical
Medicine
University of Florence
Florence, Italy
[email protected]
Riccardo Pistelli
Catholic University
Columbus Hospital
Rome, Italy
[email protected]
Alessandro Pitruzzella
Fondazione Salvatore Maugeri
IRCCS
Veruno, Italy
[email protected]
Giovanni Poletti
Hematology Laboratory Area Vasta
Romagna
Pievesestina, Italy
[email protected]
Venerino Poletti
Department of Diseases of the
Thorax
Ospedale GB Morgagni
Forlì, Italy
[email protected]
xxivFederica Pulvirenti
Dept of Clinical Medicine
Reference Centre for Primary
Immunodeficiencies
Sapienza University of Rome
Rome, Italy
[email protected]
Isabella Quinti
Dept of Molecular Medicine
Reference Centre for Primary
Immunodeficiencies
Sapienza University of Rome
Rome, Italy
[email protected]
Elisabeth Quoix
University of Strasbourg
University Hospital
Strasbourg, France
[email protected]
Klaus F. Rabe
Centre for Pneumology and Thoracic
Surgery
Grosshansdorf Hospital
Grosshansdorf, Germany
[email protected]
Anna Rask-Anderson
Uppsala University
Uppsala, Sweden
[email protected]
Luca Richeldi
Centre for Rare Lung Disease
Dept of Medical and Surgical
Sciences
University of Modena and Reggio
Emilia
Modena, Italy
xxv
Josep Roca
Hospital Clinic
IDIBAPS
CIBERES
University of Barcelona
Barcelona, Spain
[email protected]
Gernot Rohde
Dept of Respiratory Medicine
Maastricht University Medical Centre
Maastricht, the Netherlands
[email protected]
Nicola Santelmo
Université de Strasbourg and
Hôpitaux Universitaires de
Strasbourg
Strasbourg, France
[email protected]
Giuseppe Sarno
Pulmonary Environmental
Epidemiology Unit
Institute of Clinical Physiology
National Research Council
Pisa, Italy
[email protected]
Giorgio Scano
Dept of Internal Medicine
Section of Immunology and
Respiratory Medicine
University of Florence
Florence, Italy
[email protected]
Arnaud Scherpereel
Faculté de Médecine, Université de
Lille Nord de France, CHRU de Lille,
and INSERM unit 1019, CIIL, Institut
Pasteur de Lille
Lille, France
[email protected]
Paul Schneider
DRK Kliniken Berlin
Thoracic Surgery
Berlin, Germany
[email protected]
Bernd Schönhofer
Abteilung für Pneumologie und
Internistische Intensivmedizin
Krankenhaus Oststadt-Heidehaus
Klinikum Region Hannover
Hanover, Germany
[email protected]
Macé M. Schuurmans
University Hospital
Zurich, Switzerland
[email protected]
Martina Sester
Dept of Transplant and Infection
Immunology
Institute of Virology
University of the Saarland
Homburg, Germany
[email protected]
Pallav L. Shah
Royal Brompton Hospital
London, UK
[email protected]
Nikolaos M. Siafakas
Dept of Thoracic Medicine
Medical School
University of Crete
Heraklion, Greece
[email protected]
Torben Sigsgaard
Aarhus University
Aarhus, Denmark
[email protected]
xxvi
Marzia Simoni
Pulmonary Environmental
Epidemiology Unit
Institute of Clinical Physiology
National Research Council
Pisa, Italy
[email protected]
Gérald Simonneau
National Reference Center for
Pulmonary Hypertension Hôpital
Antoine Béclère
Paris, France
France
[email protected]
Giovanni Sotgiu
Epidemiology and Medical Statistics
Unit
Department of Biomedical Sciences,
University of Sassari
Sassari, Italy
[email protected]
Paolo Spagnolo
Centre for Rare Lung Disease
Dept of Medical and Surgical
Sciences
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Antonio Spanevello
Pneumology Unit, Fondazione
Sal-vatore Maugeri, IRCCS Tradate, and
Dept of Clinical and
Experimental Medicine, University of
Insubria, Varese, Italy
[email protected]
Nick ten Hacken
University Medical Center Groningen
Groningen, the Netherlands
[email protected]
Einar Thorsen
University of Bergen
Bergen, Norway
[email protected]
Pietro Torricelli
Division of Radiology
Dept of Diagnostic and Imaging
Services
University of Modena and Reggio
Emilia
Modena, Italy
[email protected]
Thierry Troosters
Respiratory Rehabilitation and
Respiratory division, University
Hospital Leuven, and Faculty of
Kinesiology and Rehabilitation
Sciences, Dept of Rehabilitation
Sciences, KU Leuven
Leuven, Belgium
[email protected]
Amanda Tufman
Division of Respiratory Medicine
and Thoracic Oncology, Hospitals of
Ludwig-Maximilians-University, and
Thoracic Oncology Centre of Munich
Munich, Germany
[email protected]
Panagiota Tzani
Department of Experimental and
Clinical Medicine
University of Parma
Parma, Italy
xxvii
Eleni G. Tzortzaki
Dept of Thoracic Medicine
Medical School
University of Crete
Heraklion, Greece
[email protected]
Davide Vallese
Fondazione Salvatore Maugeri
IRCCS
Veruno, Italy
[email protected]
Paul Van Houtte
Dept of Radiation Oncology
Institut Jules Bordet
Université Libre de Bruxelles
Brussels, Belgium
[email protected]
Peter van Luijk
University Medical Center Groningen
University of Groningen
Groningen, the Netherlands
[email protected]
Hans Van Remoortel
Faculty of Kinesiology and
Rehabilitation Sciences
Dept of Rehabilitation Sciences
KU Leuven
Leuven, Belgium
[email protected].
be
Paul E. Van Schil
Dept of Thoracic and Vascular
Surgery
Antwerp University Hospital
Antwerp, Belgium
[email protected]
Johan Vansteenkiste
Respiratory Oncology Unit
Dept of Pulmonology
University Hospital Leuven
Leuven, Belgium
[email protected]
Johny A. Verschakelen
University Hospitals Leuven
Leuven, Belgium
[email protected]
Andrea Vianello
Respiratory Pathophysiology and
Intensive Care Division
University City Hospital of Padua
Padua, Italy
[email protected]
Chiara Vicari
Fondazione Salvatore Maugeri
IRCCS
Veruno, Italy
[email protected]
Giovanni Viegi
Pulmonary Environmental
Epidemiology Unit, Institute of
Clinical Physiology, National
Research Council, Pisa and
A. Monroy Institute of Biomedicine
and Molecular Immunology, National
Research Council, Palermo, Italy
[email protected]
Duccio Volterrani
Nuclear Medicine
University of Pisa
Pisa, Italy
[email protected]
xxviii
Florian von Groote-Bidlingmaier
Division of Pulmonology
Dept of Medicine
University of Stellenbosch and
Tygerberg Academic Hospital
Cape Town, South Africa
[email protected]
Susan A. Ward
Human Bio-Energetics Research
Centre
Crickhowell, UK
[email protected]
Jadwiga A. Wedzicha
Academic Unit of Respiratory
Medicine
University College London
London, UK
[email protected]
Athol U. Wells
Interstitial Lung Disease Unit
Royal Brompton Hospital
London, UK
[email protected]
Tobias Welte
Dept of Respiratory Medicine
Hannover Medical School
Hanover, Germany
[email protected]
Brian J. Whipp
†Nathalie Wirth
University of Nancy Henri Poincaré
Nancy, France
[email protected]
Mark Woodhead
Dept of Respiratory Medicine
Manchester Royal Infirmary
Manchester, UK
[email protected]
Andrea Zanini
Pneumology Unit, Fondazione
Salvatore Maugeri, IRCCS, Tradate,
Italy and Dept of Clinical and
Experimental Medicine, University of
Insubria, Varese, Italy
[email protected]
Jean-Pierre Zellweger
Swiss Lung Association
Berne, Switzerland
[email protected]
Eleftherios Zervas
7th Pulmonary Dept
Athens Chest Hospital
Athens, Greece
[email protected]
Gernot Zissel
Dept of Pneumology
University Medical Centre Freiburg
Freiburg, Germany
xxix
Preface
Eight years ago, the ERS School started a very ambitious project to harmonise
education in respiratory medicine for European specialists (HERMES). A
preliminary survey among 29 European countries showed considerable
variation in postgraduate training. Based on these findings, the ERS School
developed a range of consensus documents: a core syllabus describing the
competencies required, a curriculum of recommendations indicating how
competencies should be taught and learned, an accreditation methodology
for training centres, and a voluntary European examination to assess whether
specialists have acquired the knowledge-based component of competence. The
Handbook, together with a vast array of educational material, such as lectures,
articles published in Breathe and the European Respiratory Monograph, and other
lectures and courses, all available on the ERS School website, together comprise
an unrivalled educational resource for anyone preparing for the European
Examination in Adult Respiratory Medicine.
The first edition of the ERS Handbook of Respiratory Medicine was published
in 2010 with the aim of providing state-of-the-art summaries in all areas of
respiratory medicine. This second edition of the Handbook has been extensively
peer review and revisited, and includes new sections on
•
cytology of the lung
•
HRCT of the chest
• long-term
ventilation
•
opportunistic infections in the immunocompromised host
•
the pharmacology of asthma and COPD
•
HRCT in the diagnosis of interstitial lung disease
•
pathology and molecular biology of lung cancer
• palliative
care
The Handbook is a comprehensive, easily accessible source of the essentials
of respiratory medicine for senior medical staff requiring revalidation, and
nursing and allied healthcare professionals at all levels who wish to keep
their knowledge up to date. All readers can be assured that as they set sail to
manage patients across the spectrum of respiratory disorders, they are armed
with the best information, access to multiple-choice questions to check their
knowledge, and a source guide for more in-depth study.
We are particularly indebted to the ERS School Committee, the ERS Publications
Office who curated the entire contents of the Handbook, and all the
contributors.
Paolo Palange, Anita K. Simonds
Chief Editors
‘To study the phenomenon of disease without books is to sail an uncharted sea, while to study books without patients is not to go to sea at all.’ ‘Too many men slip early out of the habit of studious reading, and yet that is essential.’ William Osler
By buying the ERS Handbook of Respiratory Medicine, you also gain access to the
electronic version of the book, as well as an accredited online CME test.
To log in, simply visit
www.ersnet.org/handbook
and enter the unique code
printed on inside of the
front cover of the book.
Once logged in, you’ll
be able to download the
entire book in PDF or
EPUB format, to read on
your computer or mobile
device.
ERS Handbook: Self-Assessment in Respiratory Medicine
Edited by Konrad E. Bloch, Paolo Palange and
Anita K. Simonds
Self-Assessment in Respiratory Medicine is an invaluable
tool for any practitioner of adult respiratory medicine.
The 111 multiple-choice questions cover the full breadth
of the specialty, using clinical vignettes that test not only
readers’ knowledge but their ability to apply it in daily
practice.
xxx
Get more from this Handbook
Also available from the ERS
You’ll also be able to take the online CME test. This handbook has been accredited
by the European Board for Accreditation in Pneumology (EBAP) for 18 CME
credits.
To buy a copy of this Handbook for €50 (€40 for ERS members) plus postage,
please contact [email protected]
xxxi
List of abbreviations
(C)HF
(Congestive) heart failure
AHI
Apnoea–hypopnoea
index
AIDS
Acquired immunodeficiency syndrome
BMI
Body mass index
CF
Cystic
fibrosis
COPD
Chronic obstructive pulmonary disease
CPAP
Continuous positive airway pressure
CT
Computed
tomography
ECG
Electrocardiogram
ENT
Ear, nose and throat
FEV1
Forced expiratory volume in 1 s
FVC
Forced vital capacity
Hb
Haemoglobin
HIV
Human immunodeficiency virus
HRCT
High-resolution computed tomography
K
COTransfer coefficient of the lung for carbon monoxide
MRI
Magnetic resonance imaging
NIV
Noninvasive
ventilation
OSA(S)
Obstructive sleep apnoea (syndrome)
P
aCO2Arterial carbon dioxide tension
P
aO2
Arterial oxygen tension
PCR
Polymerase chain reaction
P
tcCO2Transcutaneous carbon dioxide tension
S
aO2
Arterial oxygen saturation
S
pO2
Arterial oxygen saturation measured by pulse oximetry
TB
Tuberculosis
TLC
Total lung capacity
T
LCOTransfer factor for the lung for carbon monoxide
Genetics
Gernot Zissel
Genetics addresses the composition, function and transmission of inherited entities (genes) summing up to the genome of an individual. Generally, the term ‘gene’ is understood as a unit coding for a single RNA that gives rise to a single and specific protein. However, due to alternative splicing, one gene may code for different proteins. There are also genes not coding for proteins but for catalytic RNAs (tRNA, rRNA) or regulatory RNAs (microRNA (miRNA)). The genotype is the specific composition of genes of an individual that influences its phenotype. However, in contrast to the genotype, which is simply inherited, a phenotype is shaped by epigenetic phenomena, environment, climate, nutrition and other external factors.
Genes are transcribed to RNA and subsequently translated into proteins. Genes do not code for ‘diseases’. Every genetic disease is based on an altered or missing protein. Because we are all equipped with a double set of
chromosomes, in the vast majority of cases, a dysfunctional gene is corrected by its counterpart with normal function. A deficiency occurs only when the respective gene is dysfunctional on both
chromosomes, or the gene product is either missing or does not perform its task. Diseases caused by the alteration of a single gene with relevance for pulmonologists are CF and a1-proteinase inhibitor (PI) deficiency (formerly a1-antitrypsin (AT) deficiency). In other diseases such a clear-cut relationship between a gene and a disease is not evident, although facts, such as geographical distribution or familial clusters, indicate a genetic background. This is the case in asthma, sarcoidosis, pulmonary fibrosis and primary pulmonary hypertension. Table 1 shows examples of mutated genes involved in respiratory disorders.
There are also numbers of gene variations that are regarded as neutral variations of the human gene pool. These variations are not harmfulper se, but together with distinct external stimuli they foster the development of certain diseases. Glutamine at position 69 in the human leukocyte antigen (HLA)-DPB1 gene does not cause an illness; however, when in contact with beryllium dust, carriers of Glu69+ HLA-DPB1 are at an increased risk of developing chronic beryllium disease (CBD). Up to 97% of CBD patients are Glu69+ HLA-DPB1 positive. Another example is the lack of functional
Key points
N
A few respiratory diseases, such as CF and a1-Pi deficiency, are single-gene conditions.N
A large range of respiratory diseases, including asthma, COPD, sarcoidosis, IPF and primary pulmonaryhypertension, may have a genetic background.
N
Non-harmful gene variants can nonetheless confer susceptibility to conditions such as chronic beryllium disease.N
The role of epigenetic regulatory mechanisms in respiratory disease is likely to be very significant.receptors for interferon-c or interleukin-12. In these cases the individuals grow up normally and reach adolescence; however, after the BCG (Bacillus Calmette–Gue´rin) vaccination or when they encounter environmental mycobacteria (e.g. Mycobacterium fortuitum, Mycobacterium chelonae), these individuals develop severe and sometimes fatal disease.
Epigenetics and regulatory genes
The genome is not a static blueprint of the phenotype as it was regarded in the past. Several mechanisms of genetic regulation, epigenetics and regulatory genes, have been discovered in recent years. The term epigenetics describes a wide field of DNA and histone modifications that contribute to the regulation of gene transcription. One of these modifications is the methylation of the nucleobase cytosine. Cytosine is methylated only in CG ‘islands’; single cytosines are not methylated. Cytosine methylation inhibits binding of RNA polymerases to the gene,
which is subsequently not translated. Cytosine methylation is important in promoter silencing and inactivation of the X chromosome.
Histone modifications are an additional form of epigenetic regulation. Histones are protein spheres that bind DNA. There are four different histones, two of each histone together with the bound DNA build a nucleosome, the core of a chromosome. Histones can be modified, mainly by acetylation, methylation and various other mechanisms. Generally, acetylation of histones opens the nucleosome structure and the gene becomes accessible for transcription. In contrast, histone methylation leads to the accumulation of additional histone proteins in turn leading to a compacted nucleosome and
subsequently inhibiting gene transcription. The miRNAs are short, highly conserved, noncoding RNAs that bind to
39-untranslated regions (39-UTR) of mRNAs. Table 1. Examples of mutated genes involved in respiratory disorders
Disease Gene Gene product Mutation(s)
CF CFTR Cystic fibrosis transmembrane conductance regulator
.1500 Emphysema SERPINA1 Serpin peptidase inhibitor,
clade A (a-1 antiproteinase, antitrypsin)
SNP G-342A .90% of cases
Chronic beryllium disease
HLA-DPB1 Histocompatibility antigen, DP(W2) b-chain
Glutamine at position 69
Sarcoidosis BTNL2 Butyrophilin-like 2 rs2076530 SNP G-11084A causing premature stop codon ANXA11 Annexin A11 rs1049550 SNP CRT, arginine
to cysteine
TNF TNF SNP G-308A
TLR TLR SNPs in variousTLR genes
influence disease course
Cancer c-Myc Promoter translocation
Ras Family of GTPases Various SNPs induce permanent activation EGFR Epidermal growth factor
receptor
Deletions, SNPs leading to over expression and permanent activation
Incomplete binding leads to silencing and complete binding to degradation of the RNA. In fact, miRNAs are powerful regulators. Activation of transcription factors, such as nuclear factor (NF)-kB leads to the transcription of a variety of immune mediator genes. Simultaneous activation of miRNAs suppresses certain mediators, giving rise to a specific pattern of mediator activation. miRNAs are of strong
importance in cancer and pulmonary fibrosis; however, one might expect that transcriptional regulation by miRNAs is also important in other diseases. The pattern of miRNAs expressed in several diseases and tumours is highly specific and might be used as a biomarker.
Genetics in CF
CF is caused by the dysfunction of the cystic fibrosis transmembrane conductance regulator (CFTR) gene, which codes for a chloride channel. However, although in all CF patients the CFTR is dysfunctional, there are .1 500 different mutations known to affect CFTR and lead to a dysfunctional chloride channel. CF inheritance follows an autosomal recessive heredity,i.e. the disease becomes manifest only when CFTR genes on both chromosomes are mutated, albeit not necessarily by the same mutation. The most common defect is the deletion of a phenylalanine at position 508 (DF508), which is responsible for up to 70% of all CF cases. Interestingly, there is a marked difference in the frequency of this disease in different populations. It is most common in Caucasians (1:2000 being highest in Scotland and the Faroe Islands (1:500)) but lower in descendants from Africa (1:15 000); and lowest in Asians (1:30 000). CFTR mutations can be grouped into classes based on their functional consequences on the CFTR within the cell: CFTR is either not synthesised, inadequately processed, not regulated, shows abnormal conductance, discloses partially defective production or shows accelerated degradation.
Genetics of proteinase inhibitors
The PI a1-antitrypsin belongs to a family of serine PIs (serpins) and blocks serine
proteases, such as neutrophil elastase, cathepsin G and proteinase 3, all released by neutrophils and is, therefore, renamed as a1-PI. The lack of a1-PI leads to an incomplete or absent containment of proteinases resulting in severe organ damage (e.g. emphysema), mostly in the lung.
There are several known mutations in the a1-PI gene, such as base substitutions, in-frame deletions, in-frame-shift mutations and exon deletions. More than 90% of cases are caused by single amino acid exchange at position 342 (glycine to lysine), which is called Z mutation. The Z mutation results in a structural alteration that inhibits post-translational modifications and secretion. Patients bearing the Z allele demonstrate ,15% of the normal a1-PI level in serum, which additionally seems to be non-functional.
The gene frequency of the Z allele is rather common in Europe, with up to 4% of the population being heterozygotic. However, the frequency declines to ,1% in southern Europe. The lowest frequency is found in African–Americans (0.4%).
Genetics in interstitial lung diseases
There is some indication that interstitial lung diseases, such as sarcoidosis, CBD or idiopathic pulmonary fibrosis (IPF), are based on a specific genetic background. Familial clusters are seen in sarcoidosis and IPF. In Europe, sarcoidosis frequency increases from South to North. This might also be a matter of climate, as the same distribution is seen in Japan. However, the Swedish population encounters the highest prevalence in Europe (55–64 per 100 000). In contrast, in the Finnish population living at the same latitude, the prevalence is just half of the Swedish (28 per 100 000). This difference points to a strong genetic background in the pathogenesis of sarcoidosis.
An inherited pre-disposition for sarcoidosis is also indicated by an increased risk of sarcoidosis in close relatives of patients. The percentage of
patients with a positive family history ranges from 2.7% in Spain to 17% in African–Americans. Analysis of familial sarcoidosis suggests that multiple small or moderate genetic effects cause a
predisposition for sarcoidosis.
Genes of high interest are the HLA class II antigens. Although some of these linkages are largely dependent on the population investigated, several associations seem to be preserved,e.g. HLA-DRB1*03
associates with spontaneous resolution and mild disease, as demonstrated in Swedish, Polish, Croatian and Czech populations.
Using different methods, a variety of candidate genes were identified and found to be associated with the susceptibility or the natural course of the disease. This included genes for co-stimulatory molecules (e.g. butyrophilin-like 2
(BTNL2)), genes involved in cell cycle (e.g. annexin A11 (ANXA11)), and genes involved in immune regulation (e.g. CD40), mediators (e.g. tumour necrosis factor (TNF)-a (TNFA2) or Toll-like receptors (TLR)). These genes may alter the reactivity of the respective cells to external stimuli which subsequently initiate an inadequate immune response.
Angiotensin-converting enzyme (ACE) is often used in the diagnosis and clinical monitoring of sarcoidosis. However, serum levels of ACE (sACE) are highly variable, which impairs the clinical use of ACE as a marker. The variability of sACE is based on a deletion/insertion in intron 16 of the ACE gene. The homozygote deletion variant is associated with higher sACE, whereas homozygote insertion is associated with lower levels.
Heterozygotes exhibit intermediate values. Therefore, in populations of Caucasian origin, the knowledge of the zygosity of the deletion/insertion variants allows the application of genotype-corrected
reference values of sACE, which leads to an improvement of the clinical application of this marker. However, this is not
applicable in populations of African origin; the ACE gene in these populations is much
more polymorphic and sACE levels are not linked with the deletion/insertion
polymorphism.
Familial pulmonary fibrosis is frequently linked with two mutations in the surfactant protein C (SP-C) gene resulting either in a splice deletion of exon 4 in a SP-C variant that cannot be processed and accumulates as pro-SP-C in the cell causing cell stress and apoptosis. The pathological pattern of fibrosis is in both forms consistent with non-specific interstitial pneumonitis in younger patients and usual interstitial pneumonia in the elderly. A recent report points to a mutation in the telomerase reverse transcriptase (TERT) causing short ends in the telomeres and bone marrow hypocellularity. But also mutations in genes regulating cell cycle like TP53 and CDKN1A are found to influence survival times in IPF.
Genetics in asthma
There is a plethora of work related to the genetics of asthma. The idea of a genetic basis for asthma is supported by the fact that there are familial clusters of asthma and differences of asthma frequency in different populations (highest at the South Atlantic island Tristan da Cunha affecting .20% of the population). However, no single gene is responsible for the development or the clinical course of asthma; instead, several genes are regarded as risk genes for developing asthma. The gene products of these genes are involved in T-cell activation, cytokine release and balance, epithelial function and repair or smooth muscle contractility. Again, new genes involved in asthma susceptibility might be expected.
Nevertheless, although there are
predisposing genes in asthma, the influence of lifestyle on the development of asthma is also evident. There is a clear increase in asthma incidences in developing countries. Therefore, asthma might be an elucidating example for the complex genotype/ phenotype relationship.