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Contributors
Brian J Angus MD, FRCP, DTM&H
Associate Professor, Nufeld Department of Medicine, Oxford University, Oxford, UK
Adam C Baker BM, BMedSci(Hons), MSc ExMed
Pre-Hospital Emergency Medicine Fellow, Honorary Senior Clinical Research Fellow, Department of Emergency Medicine, University Hospitals Plymouth NHS Trust, Devon Air Ambulance, University of Exeter, Devon, UK
James G Boyle MBChB, MD, MSc, FRCP
Consultant Diabetologist, Department of Diabetes, Endocrinology and Clinical Pharmacology, Glasgow Royal Inrmary; Honorary Associate Clinical Professor, School of Medicine, Dentistry and Nursing, University of Glasgow, Glasgow, UK
Harry Campbell MBChB, MD, FRCPE, FFPH, FRSE, FMedSci
Professor of Genetic Epidemiology and Public Health, Centre for Global Health, Usher Institute, University of Edinburgh, Edinburgh, UK
Thean Soon Chew MBChB, MRCP, PhD
Consultant Gastroenterologist and Honorary Senior Lecturer in Gastroenterology, Academic Unit of Gastroenterology, University of Shefeld, Shefeld, UK
Ian J Clifton MD, FRCP
Consultant Respiratory Physician and Honorary Senior Lecturer, Department of Respiratory Medicine, St James’s University Hospital, Leeds, UK
Sally Clive BMedSci(Hons), MBChB, MD, FRCPE
Consultant Medical Oncologist, Edinburgh Cancer Centre, Western General Hospital, Edinburgh, UK
Gavin PR Clunie MD, FRCP
Consultant Rheumatologist and Metabolic Bone Physician, Department of Rheumatology, Cambridge University Hospital NHS Foundation Trust, Addenbrooke’s Hospital, Cambridge, UK
Daniel J Clutterbuck BSc(Hons), FRCP
Consultant in Genitourinary and HIV Medicine, NHS Lothian; Chalmers Sexual Health Centre, Edinburgh, UK
Myles D Connor MBBCh, FCP(SA), FCNeurol(SA), PhD, FRCPE
Consultant Neurologist, Department of Neurology, NHS Borders, Melrose, UK; Honorary Senior Lecturer, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK; Honorary Senior Researcher, School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
Bryan Conway MB, MRCP, PhD
Senior Lecturer and Honorary Consultant Nephrologist, Department of Renal Medicine, University of Edinburgh and Edinburgh Royal Inrmary, Edinburgh, UK
Nicola Cooper MBChB, MMedSci, FRCPE, FRACP, FAcadMEd, SFHEA
Consultant Physician and Clinical Associate Professor in Medical Education, Department for Acute Internal Medicine, University Hospitals of Derby & Burton NHS Foundation Trust, Derby, UK
Alison L Cracknell MBChB, FRCP
Consultant in Medicine for Older People, Department of Medicine for Older People, Leeds Teaching Hospitals NHS Trust; Honorary Clinical Associate Professor, University of Leeds, Leeds, UK
Dominic J Culligan BSc, MD, FRCP, FRCPath
Consultant Haematologist and Honorary Senior Lecturer, Department of Haematology, Aberdeen Royal Inrmary, Aberdeen, UK
David H Dockrell MD, FRCPI, FRCPG, FACP
Chair of Infection Medicine, Centre for Inammation Research, University of Edinburgh; Professor of Infection Medicine, UoE Centre for Inammation Research, University of Edinburgh, Edinburgh, UK
Deborah AB Ellames BSc(Hons), MBChB
Consultant Physician in Respiratory Medicine, Department of Respiratory Medicine, Leeds Teaching Hospitals NHS Trust, Leeds, UK
Marie Fallon MBChB, MD, FRCPG, FRCPE, DCH, DRCOG, MRCGP
St Columba’s Hospice Chair of Palliative Medicine, Edinburgh Cancer Research Centre, Institute for Genetics and Cancer, University of Edinburgh, Edinburgh, UK
Lesley A Colvin MBChB, PhD, FRCA, FFPMRCA, FRCPE
Professor of Pain Medicine, Division of Population Health and Genomics, University of Dundee School of Medicine, Dundee, UK
Fraser W Gibb MBChB, BSc(Hons), FRCP, PhD
Consultant Physician/Honorary Clinical Reader, Edinburgh Centre for Endocrinology and Diabetes, Royal Inrmary of Edinburgh/ University of Edinburgh, Edinburgh, UK
xii  CONT RIB UTOR S
Timothy T Gordon-Walker MBChB, PhD, MRCP
Consultant Hepatologist, Department of Gastroenterology and Scottish Liver Transplant Unit, The Royal Inrmary of Edinburgh, Edinburgh, UK
Neil R Grubb MD, FRCP
Consultant in Cardiology and Cardiac Electrophysiology, Department of Cardiology, Royal Inrmary of Edinburgh, Edinburgh, UK
David PJ Hunt MB BChir, PhD, FRCP
Wellcome Senior Clinical Fellow, Department of Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
Sally H Ibbotson BSc(Hons), MD, FRCPE
Professor of Photodermatology, University of Dundee; Honorary Consultant Dermatologist and Head of Photobiology Unit, Ninewells Hospital and Medical School, Dundee, UK
Sara J Jenks MBChB, MRCP, FRCPath
Consultant in Metabolic Medicine, Department of Clinical Biochemistry, Royal Inrmary of Edinburgh, Edinburgh, UK
Sarah L Johnston FRCP, FRCPath
Consultant Immunologist, Department of Immunology and Immunogenetics, North Bristol NHS Trust, Bristol, UK
Stephen M Lawrie MD(Hons), FRCPsych, Hon FRCPE, FRSE
Professor of Psychiatry and Neuroimaging, Division of Psychiatry, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
David A McAllister MBChB, MPH, MD, MRCP, MFPH
Wellcome Trust Intermediate Clinical Fellow and Beit Fellow and Honorary Consultant in Public Health Medicine, Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
Eve Miller-Hodges MBChB, PhD
Senior Clinical Lecturer and Honorary Consultant in Inherited Metabolic Disorders and Renal Medicine, Centre for Cardiovascular Science & Scottish IMD Service, University of Edinburgh, Edinburgh, UK
Francesca EM Neuberger MBChB, FRCP
Consultant Physician in Acute and Obstetric Medicine, Medical Division, North Bristol NHS Trust, Bristol, UK
David E Newby BA BSc(Hons), PhD, BM DM DSc, FRSE, FESC, FACC, FMedSci
British Heart Foundation Duke of Edinburgh Chair of Cardiology, Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, UK
John DC Newell-Price MA, PhD, FRCP
Professor of Endocrinology, Department of Oncology and Metabolism, University of Shefeld, Shefeld, UK
John A Olson MD, FRCPE, FRCOphth
Consultant Ophthalmic Physician, Aberdeen Royal Inrmary; Honorary Reader, University of Aberdeen, Aberdeen, UK
John R Petrie BSc, MBChB, PhD, FRCPE, FRCPG
Professor of Diabetic Medicine, Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
Michael EJ Lean MA, MB, BChir, MD, FRCP, FRSE
Professor of Human Nutrition, Human Nutrition, University of Glasgow, Glasgow, UK
Gary Maartens MBChB, MMed, FCP(SA)
Chair of Clinical Pharmacology, Department of Medicine, University of Cape Town, Cape Town, South Africa
Lucy H Mackillop BM BCh, MA(Oxon), FRCP
Consultant Obstetric Physician, Oxford University Hospitals, NHS Foundation Trust; Honorary Senior Clinical Lecturer, Nufeld Department of Women’s and Reproductive Health, University of Oxford, Oxford, UK
Michael J MacMahon FRCA, EDIC
Consultant Intensivist, Department of Anaesthesia and Intensive Care, Victoria Hospital, Kirkcaldy, UK
Rebecca J Mann BMedSci, BMBS, MRCP, FRCPCh
Consultant Paediatrician, Department of Paediatrics, Taunton and Somerset NHS Foundation Trust, Taunton, UK
Lynn M Manson MBChB, MD
Consultant Haematologist, Department of Transfusion Medicine, Royal Inrmary of Edinburgh, Edinburgh, UK
Amanda Mather MBBS, FRACP, PhD
Renal Staff Specialist, Department of Renal Medicine, Royal North Shore Hospital; Conjoint Senior Lecturer, Faculty of Medicine, University of Sydney, Sydney, NSW, Australia
Paul J Phelan MD, FRCPE
Consultant Nephrologist and Renal Transplant Physician, Department of Nephrology, Royal Inrmary of Edinburgh, Edinburgh, UK
Terence J Quinn FRCP, MD, MBChB, BSc
Senior Clinical Lecturer and Honorary Consultant in Geriatric Medicine, Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
Stuart H Ralston MBChB, MD, FRCP, FFPM(Hon), FMedSci, FRSE
Professor of Rheumatology, Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Edinburgh, UK
Anupam Rej MBChB, BMedSci(Hons), MRCP(UK)
Clinical Research Fellow, Academic Unit of Gastroenterology, Royal Hallamshire Hospital, Shefeld, UK
David S Sanders MBChB, MD, FACG
Professor of Gastroenterology, Academic Unit of Gastroenterology, Royal Hallamshire Hospital and University of Shefeld, Shefeld, UK
Jonathan AT Sandoe FRCPath, PhD
Associate Clinical Professor, Consultant Microbiologist, Department of Microbiology, University of Leeds and Leeds Teaching Hospitals NHS Trust, Leeds, UK
Alan G Shand MD, FRCPE
Consultant Gastroenterologist, Gastrointestinal Unit, Western General Hospital, Edinburgh, UK
Simon RJ Maxwell MD, PhD, FRCP, FRCPE, FBPhS
Professor of Student Learning (Clinical Pharmacology and Prescribing), Clinical Pharmacology Unit, University of Edinburgh, Edinburgh, UK
Mark Stares MBBS, MD(Res), MRes, BSc, MRCP
Medical Oncologist, Edinburgh Cancer Centre, Western General Hospital, NHS Lothian, Edinburgh, UK
CO NTR IBU T ORS  xiii
Robby M Steel MA, MD, FRCPsych
Consultant Liaison Psychiatrist and Honorary (Clinical) Senior Lecturer in Psychiatry, Department of Psychological Medicine, Royal Inrmary of Edinburgh, Edinburgh, UK
Grant D Stewart BSc, MBChB, PhD Edin, MA Cantab, FRCSE (Urol)
Professor of Surgical Oncology, Department of Surgery, University of Cambridge, Cambridge, and Honorary Consultant Urological Surgeon, Addenbrooke’s Hospital, Cambridge, UK
David R Sullivan MBBS, FRACP, FRCPA, FCSANZ
Head of Department, Department of Chemical Pathology, NSW Health Pathology, Sydney, NSW, Australia
Shyam Sundar MD, FRCP, FAMS, FASc, FNA
Distinguished Professor, Department of Medicine, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
Victoria R Tallentire MBChB, MD, FRCP
Consultant Acute Physician and Associate Postgraduate Dean, Medical Directorate, NHS Education for Scotland, Edinburgh, UK
Katrina Tatton-Brown BM BCh, BA, MD
Professor of Clinical Genetics and Genomic Education and Consultant in Clinical Genetics, South West Thames Regional Genetics Service, St George’s University Hospitals NHS Foundation Trust, London, UK
Simon HL Thomas BSc, MD, FRCP, FRCPE, FEAPCCT, FACCT
Professor of Clinical Pharmacology and Therapeutics, Translational and Clinical Research Institute, Newcastle University, Newcastle-upon-Tyne, UK
Henry G Watson MD, FRCP, FRCPath
Consultant Haematologist and Honorary Professor of Medicine, Department of Haematology, Aberdeen Royal Inrmary, Aberdeen, UK
Julian White MD, FACTM
Clinical Toxinologist and Head of Toxinology, Toxinology Department and University of Adelaide Department of Paediatrics, Women’s & Children’s Hospital, North Adelaide, SA, Australia
William Whiteley BA, BM BCh, MSc, PhD, FRCP
Reader in Neurology, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK; Senior Research Fellow, Nufeld Department of Population Health, University of Oxford, Oxford, UK
Michael J Williams BM BCh, PhD
Consultant Hepatologist, Scottish Liver Transplant Unit, Royal Inrmary of Edinburgh, Edinburgh, UK
Rebecca Woodeld MA, MB BChir, MRCP, PhD
Consultant Geriatrician and Stroke Physician, Department of Medicine for the Elderly, Western General Hospital, Edinburgh, UK
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International Advisory Board
ABM Abdullah MRCP(UK), FRCPE
UGC Professor, Department of Medicine, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
Amitesh Aggarwal MD, FRCPE, FACP(USA), FRCPG, FICP, FIACM, FIMSA, FISE, FIAMS, FUPDA, FGSI, FISH, FRSSDI
Professor, Department of Medicine, University College of Medical Sciences (University of Delhi) and GTB Hospital, Delhi, India
Matthew A Brown MBBS, MD, FRACP, FAHMS, FAA
Director, Guy’s and St Thomas’ NHS Foundation Trust and King’s College London NIHR Biomedical Research Centre, King’s College London, London, UK
Arnold N Cohen MD, FACP, FACG, AGAF
Professor of Medicine, Department of Medical Education and Science, Elson S. Floyd College of Medicine of Washington State University; Associate Clinical Professor of Medicine Emeritus, University of Washington School of Medicine, Spokane, Washington, USA
Mradul Kumar Daga MD, FRCP, FCCP
Professor of Medicine and In-Charge Medical ICU, Department of Internal Medicine, Maulana Azad Medical College, New Delhi, India
D Dalus MD, PhD, FRCP, FRCPE, FRCPG
Professor of Medicine and Senior Consultant, Department of Internal Medicine, Cosmopolitan Hospitals, Trivandrum, Kerala, India
Sydney C Dsouza MD
Professor and Head, Department of Internal Medicine, Yenepoya Medical College, Mangaluru, Karnataka, India
Tarun K Dutta MBBS, MD
Emeritus Professor, Department of General Medicine, Mahatma Gandhi Medical College and Research Institute, Puducherry, India
M Abul Faiz MBBS, FCPS, PhD
Professor of Medicine (Retired), Department of Medicine, Sir Salimullah Medical College and Dev Care Foundation, Dhaka, Bangladesh
Albert G Frauman MD, FRACP, FACP, FACCP, FBPhS
Professor of Clinical Pharmacology and Therapeutics, The University of Melbourne; Director, Department of Clinical Pharmacology and Therapeutics, Austin Health, Victoria, Australia
Hadi Goubran MBBCh, MSc, MD, FACP, FRCPE
Professor, Division of Hematology and Oncology, Saskatoon Cancer Centre and College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
Rajiva Gupta MD, MRCP, FRCP
Vice Chairman and Head, Department of Rheumatology and Clinical Immunology, Medanta The Medicity, Gurgaon, India
Quazi T Islam FCPS, FRCP, FRCPE, MACP
Professor of Medicine, Department of Medicine, Popular Medical College, Dhaka, Bangladesh
Saroj Jayasinghe MBBS, MD, MRCP(UK), PhD, FRCP, FCCP, FNASSL
Consultant Physician and former Chair Professor of Medicine, Department of Clinical Medicine, University of Colombo, Colombo, Sri Lanka
AL Kakrani MD, FICP
Professor of Clinical Eminence and Director of Academic Collaborations, Department of Medicine, Dr. D.Y. Patil Medical College, Hospital and Research Centre, Pune, Maharashtra, India
Vasantha Kamath MD, FICP
Senior Professor in Internal Medicine, Department of Internal Medicine, MVJ Medical College and Research Hospital, Hoskote, Bangalore, Karnataka, India
Ammar F Mubaidin MD, FRCPE, FRCPG
Professor of Clinical Neurology, Department of Neurology, Al Khalidi Medical Centre, Amman, Jordan
Milind Y Nadkar MD, FICP, FACP
Additional Dean (Academic) and Professor and Head, Department of Medicine and Rheumatology Services, Seth G S Medical College and KEM Hospital, Mumbai, Maharashtra, India
Viswanathan Neelakantan MBBS, DNB, FRCPG, FRCP, FACP, AB
Senior Professor of Medicine and Consultant in Tropical Medicine, Department of Internal Medicine, Sri Manakula Vinayagar Medical College Hospital, Puducherry, India
Sujoy Ghosh MD, DM, FRCP, FRCPE, FRCPG, FACE
Professor, Department of Endocrinology, Institute of Post Graduate Medical Education and Research, Kolkata, West Bengal, India
Matthew Ng FRCP, FRCPE
Honorary Clinical Professor, Department of Medicine, University of Hong Kong, Pok Fu Lam, Hong Kong
xvi  INTE RNAT ION AL A DVI SORY B OAR D
Ami Prakashvir Parikh MD
Professor and Head, Department of Medicine, Smt. NHL Municipal Medical College and SVP Hospital, Ahmedabad, Gujarat, India
Medha Y Rao MBBS, MD, PGDHHM
Senior Professor of Internal Medicine and Principal and Dean, Department of General Medicine, M.S. Ramaiah Medical College, Bangalore, Karnataka, India
NR Rau MD, FICP
Consultant Physician, Anugraha Medical Center, Udupi, Karnataka, India; Consultant Physician and Head, Department of Internal Medicine, Adarsh Hospital, Udupi, Karnataka, India; Former Professor and Head, Department of Medicine, Kasturba Medical College, Manipal, India
Jacek Rozanski MD, PhD
Professor of Medicine, Department of Nephrology, Transplantology, and Internal Medicine, Pomeranian Medical University, Szczecin, Poland
Sarkar Nirmalendu MD
Honorary Professor, Department of General Medicine, Ramakrishna Mission Sevapratishthan and Vivekananda Institute of Medical Sciences, Kolkata, West Bengal, India
Surendra K Sharma MD (Internal Medicine), PhD
Adjunct Professor, Department of Molecular Medicine, Jamia Hamdard Institute of Molecular Medicine, Hamdard University, Hamdard Nagar, Delhi, India
Arvind K Vaish MD, FICP
Professor and Head, Department of Medicine, Hind Institute of Medical Sciences; Former Professor and Head of Medicine, King George’s Medical University, Lucknow, India
Josanne Vassallo MD, PhD, FRCP, FACP, FACE
Professor and Consultant Endocrinologist, Department of Medicine, Division of Endocrinology, University of Malta Medical School, Msida, Malta
Special Content Advisor for the Indian National Medical Commission undergraduate curriculum
Professor Dilip R Karnad MD, FRCPG, FACP
Senior Consultant in Critical Care, Jupiter Hospital, Thane, India
Acknowledgements
The editors would like to acknowledge and offer grateful thanks for the input of all previous editions’ contributors, without whom this new edition would not have been possible.
In particular we are indebted to those former authors who step down with the arrival of this new edition. They include Quentin M Anstee, Leslie Burnett, Mark Byers, Graham G Dark, Richard J Davenport, Emad El-Omar, David R FitzPatrick, J Alastair Innes, David EJ Jones, Peter Langhorne, John Paul Leach, Sara E Marshall, Rory J McCrimmon, Mairi H McLean, Ewan R Pearson, Peter T Reid, Gordon R Scott, Peter Stewart, John PH Wilding and Miles D Witham.
We are grateful to members of the International Advisory Board, all of whom provided detailed suggestions that have improved the book. Several members have now retired from the Board and we are grate­ful for their support during the preparation of previous editions. They include Ragavendra Bhat, Khalid I Bzeizi, Piotr Kuna, Pravin Manga, Moffat Nyirenda, Tommy Olsson, KR Sethuraman, Ibrahim Sherif, Ian J Simpson, SG Siva Chidambaram and Josanne Vassallo. We are equally grateful to new members of our International Advisory Board, who have given us valuable advice as we prepared this new edition, including ABM Abdullah, Quazi T Islam, Viswanathan Neelakantan and Jacek Rozanski.
We would like to extend special thanks to Professor Dilip Karnad, Jupiter Hospital, Thane, India, who thoroughly reviewed all chapters of this 24th edition in draft form, to help ensure the coverage of this edition is more relevant than ever to our large readership in India, Pakistan and Bangladesh. He provided invaluable advice to the editorial team dur­ing preparation of the 24th edition and exhaustive feedback on how the content aligns with competencies in the current Indian National Medical Commission undergraduate curriculum. Readers of the International Edition of this book can now access a comprehensive Competency Mapping Guide with full page references for the rst time as a result of this thorough review.
Detailed chapter reviews were commissioned to help plan this new edition and we are grateful to all those who assisted, including Professor Rustam Al-Shahi, Dr Daniel Beckett, Dr Helen Cohen, Dr Ian Edmond, Dr David Enoch, Professor Tonks Fawcett, Dr Colin Forfar, Professor Richard Gilson, Dr Helena Gleeson, Dr Peter Hall, Dr Greg Heath, Dr Richard Herriot, Dr Robert Lindsay, Dr Catherine Nelson-Piercy and Dr Alex Rowe.
The Editors and Publisher would like to thank all those who have pro­vided valuable feedback on this textbook and whose comments have helped shape this new edition. We would particularly like to extend our thanks to the many readers who contact us with suggestions for improvements. This input has been invaluable and is much appreciated; we regret the names are too numerous to mention individually.
The authors of Chapter 20 would like to thank Dr Drew Henderson, who reviewed the ‘Diabetic nephropathy’ section, and we are indebted to Dr Ruth Darbyshire for assistance with the Ophthalmology multiple choice questions to accompany Chapter 30.
Two short sections in Chapter 3 on array comparative genomic hybridisation and single-molecule sequencing are adapted from Dr K Tatton-Brown’s Massive Open Online Course for FutureLearn. We would like to thank the Open University and St George’s, University of London, for permission to use this material.
We are especially grateful to Laurence Hunter and Wendy Lee from Elsevier for their endless support and expertise in the shaping, collation and publication of Davidson’s over many years and who have now retired. We have thoroughly enjoyed working with a new team including Jeremy Bowes, Siân Jarman and Anne Collett who have seamlessly taken over the reins. We are delighted that Robert Britton continues to work on the book and illustrate it beautifully. We are proud of this new edition and are condent it will remain an essential and invaluable resource for readers the world over.
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Introduction
The opening chapters of the book, making up Part 1 on ‘Fundamentals of Medicine’, provide an account of the principles of genetics, immunol­ogy, infectious diseases and population health, oncology and pain man­agement, along with a discussion of the core principles behind clinical decision-making and good prescribing. Subsequent chapters in Part 2, ‘Emergency and Critical Care Medicine’, discuss medical emergencies in poisoning, envenomation and medicine in austere environments, while
Chapter 9 explores common presentations in acute medicine, as well
as the recognition and management of the critically ill. The third part, ‘Clinical Medicine’, is devoted to the major medical specialties. Each chapter has been written by experts in the eld to provide the level of detail expected of trainees in their discipline. To maintain the book’s virtue of being concise, care has been taken to avoid unnecessary duplication between chapters.
The system-based chapters in Part 3 follow a standard format, begin­ning with an overview of the relevant aspects of clinical examination, followed by an account of functional anatomy, physiology and investi­gations, then the common presentations of disease, and details of the individual diseases and treatments relevant to that system. In chapters that describe the immunological, cellular and molecular basis of disease, this problem-based approach brings the close links between modern medical science and clinical practice into sharp focus.
The methods used to present information are described below.
Clinical examination overviews
The value of good clinical skills is highlighted by a two-page overview of the important elements of the clinical examination at the beginning of most chapters. The left-hand page includes a mannikin to illustrate key steps in examination of the relevant system, beginning with simple observations and progressing in a logical sequence around the body. The right-hand page expands on selected themes and includes tips on examination technique and interpretation of physical signs. These over­views are intended to act as an aide-mémoire and not as a replacement for a detailed text on clinical examination, as provided in our sister title,
Macleod’s Clinical Examination
Presenting problems
Medical students and junior doctors must not only assimilate a great many facts about various disorders, but also develop an analytical approach to formulating a differential diagnosis and a plan of investigation for patients who present with particular symptoms or signs. In Davidson’s this is addressed by incorporating a ‘Presenting Problems’ section into all rel­evant chapters. Nearly 250 presentations are included, which represent the most common reasons for referral to each medical specialty.
Boxes
Boxes are a popular way of presenting information and are particularly useful for revision. They are classied by the type of information they contain, using specic symbols.
General Information
These include causes, clinical features, investigations, treatments and other useful information.
Practice Point
There are many practical skills that students and doctors must master. These vary from inserting a nasogastric tube to reading an ECG or X-ray, or interpreting investigations such as arterial blood gases or thyroid func­tion tests. ‘Practice Point’ boxes provide straightforward guidance on how these and many other skills can be acquired and applied.
Emergency
These boxes describe the management of many of the most common emergencies in medicine.
In Old Age
Life expectancy is increasing in many countries and older people are the chief users of health care. While they contract the same diseases as those who are younger, there are often important differences in the way they present and how they are best managed. Chapter 34, ‘Ageing and disease’, concentrates on the principles of managing the frailest group, who suffer from multiple comorbidity and disability, and who tend to present with non-specic problems such as falls or delirium. Many older people, though, also suffer from specic single-organ pathology. ‘In Old Age’ boxes are thus included in each chapter and describe common presentations, implications of physiological changes of ageing, effects of age on investigations, problems of treatment in old age, and the benets and risks of intervention in older people.
In Pregnancy
Many conditions are different in the context of pregnancy, while some arise only during or shortly after pregnancy. Particular care must be taken with investigations (for example, to avoid radiation exposure to the fetus) and treatment (to avoid the use of drugs that harm the fetus). These issues are highlighted by ‘In Pregnancy’ boxes distributed throughout the book, which complement Chapter 32, ‘Maternal medicine’.