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Basic Science for the MRCS E-Book

Basic Science for the MRCS E-Book

Andrew T Raftery | Michael S. Delbridge | Helen E. Douglas

(2017)

Additional Information

Abstract

This is a concise revision guide to the core basic sciences for all surgical trainees preparing for Part A of the Intercollegiate MRCS examination. Covering anatomy, physiology and pathology it has been written in a style to facilitate easy learning of the essential facts, with indications of both their clinical relevance and importance. This book concentrates on those topics which tend to be recurring examination themes for initial surgical training. It will be an invaluable resource for the basic surgical trainee as well as proving useful for those in higher surgical training and for the surgically-inclined, well-motivated student.

  • The book covers in one volume all the essentials of the basic sciences – anatomy, physiology and pathology - to aid the candidate for the MRCS examination.
  • In covering the applied basic science the books explains the application and clinical relevance of the three sciences.
  • The text is written in an appropriate ‘bullet-point’ style to allow easy reading rapid exam preparation.
  • The contents concentrate on the recurring common themes of the examination, thus helping direct appropriate learning and focussing on the specific important areas of knowledge.
  • The book is illustrated with clear line drawings which are clearly annotated to aid learning.
  • Now available on StudentConsult with a downloadable ebook version included.
  • 250 new online single-best answer questions in the format of the MRCS Part A examination will give the reader valuable experience in assessing their knowledge. Each answer will refer back to text for further reading as required.
  • New and updated OSCE ‘Clinical scenarios’ will be included at the end of every chapter.

Table of Contents

Section Title Page Action Price
Front Cover cover
Inside Front Cover ifc1
Basic Science for the MRCS i
Copyright Page iv
Table Of Contents v
Online contents vi
Preface vii
Acknowledgements viii
I Anatomy 1
1 The thorax 3
Development 3
Heart and great vessels 3
Heart (Fig. 1.1) 3
Great vessels (Fig. 1.2) 4
Fetal circulation (Fig. 1.3) 4
Congenital anomalies 5
Malposition 5
Left-to-right shunt 5
Atrial septal defect (ASD) 5
Ventricular septal defect 6
Patent ductus arteriosus (PDA) 6
Eisenmenger’s syndrome 6
Right-to-left shunt (cyanotic) 6
Fallot’s tetralogy 6
Other congenital anomalies 6
Coarctation of the aorta 6
Abnormalities of valves 6
The diaphragm (Fig. 1.4) 6
II Physiology 179
7 General physiology 181
Homeostasis 181
Nervous system 181
Hormonal system 181
Thermoregulation 181
Heat production 181
Heat loss 181
Regulation of body temperature 181
Peripheral thermoreceptors 182
Reflex vasoconstriction 182
Reflex vasodilatation 182
Receptors on internal surfaces 182
Body temperature 182
Core temperature 182
Peripheral temperature 182
Abnormal temperature regulation 182
Fever (pyrexia) 182
Heatstroke 182
Hypothermia 182
Factors affecting thermoregulation 183
Fluid Balance and Fluid Replacement Therapy 183
Body water 183
Functions of the Kidney 183
Diuresis 183
Water diuresis 183
Osmotic diuresis 183
Water Balance 184
Regulation of total body water 184
Disturbances of Total Body Water Content 184
Water depletion 184
Water intoxication 184
Electrolyte Disorders 185
Sodium 185
Regulation of sodium 185
Renal 185
Extrarenal 185
Sodium excess 185
Sodium depletion 186
Potassium 186
Hyperkalaemia 187
Hypokalaemia 187
Acid–Base Balance 187
Carbonic acid–bicarbonate system 187
Disturbances of acid–base balance 188
Respiratory acidosis 188
Respiratory alkalosis 188
Metabolic acidosis 189
Metabolic alkalosis 189
Mixed acid–base disorders 189
Interpretation of acid–base changes 190
Anion gap 190
Fluid Balance and Fluid Replacement Therapy 190
Fluid balance in the uncomplicated patient 190
Change in fluid and electrolyte requirements in response to surgery and trauma 190
Fluid and electrolyte problems in surgical patients 191
Blood and plasma 191
Gastrointestinal losses 191
Intraperitoneal fluid loss 192
Septicaemia 192
Excessive insensible fluid loss 192
Colloid and Crystalloid Solutions 192
Types 192
Uses 192
Albumin 192
Dextran 192
Gelatins 192
Hydroxyethyl starch 192
Choice of plasma expanders 193
General problems of plasma expanders 193
Crystalloids 193
Common types 193
Uses 193
Oedema and Lymphatic Function 194
Causes of oedema 194
Obstruction to lymphatics 194
Osce Scenarios 195
OSCE Scenario 7.1 195
OSCE Scenario 7.2 195
OSCE Scenario 7.3 195
8 Respiratory system 196
Introduction 196
Components 196
Function 196
Airway function 196
Mechanics of Ventilation 196
Pulmonary ventilation 196
Lung pressures (Fig. 8.1) 197
Surfactant and surface tension (Fig. 8.2) 197
Compliance (Fig. 8.3) 198
Respiratory muscles 199
Work of breathing (Fig. 8.4) 199
Regional variations in ventilation (Fig. 8.5) 199
Clinical physiology 200
Pneumothorax 200
Spontaneous (primary) pneumothorax 200
Spontaneous (secondary) pneumothorax 200
Traumatic (closed) pneumothorax 200
Tension pneumothorax 200
Open pneumothorax or ‘sucking’ chest wound 200
Pulmonary assessment 200
Lung volumes (Box 8.1) 200
Dead space and alveolar ventilation rate 201
Peak expiratory flow rate (PEFR) 203
Closing capacity 203
Flow–volume and volume–time curves 204
Diffusion capacity 204
Pulmonary Blood Flow 204
Structure of the lung 204
Regulation of pulmonary blood flow 204
Regional variations in pulmonary blood flow 204
Cardiac output and pulmonary vascular resistance 205
Ventilation and perfusion 205
Clinical physiology 205
Pulmonary embolus 205
Pleural effusion 206
Pulmonary oedema 206
Adult respiratory distress syndrome 206
Gas Diffusion and Exchange 207
Gas diffusion 207
Gas exchange (Table 8.1) 207
Gas transport (Fig. 8.11) 207
Oxygen transport 208
Carbon dioxide transport 208
Regulation of Respiration 210
Neurological regulation 210
Chemical regulation 210
Hypoxia and respiratory failure 211
Hypoxia and hypoxaemia 211
Respiratory failure 212
Clinical physiology 212
Response to hypoxia 212
Acute 212
Chronic 212
Oxygen therapy and mechanical ventilation 212
Oxygen therapy 212
Mechanical ventilation 213
Indications 213
Intermittent positive pressure ventilation (IPPV) 213
Complications 213
Osce Scenarios 214
OSCE Scenario 8.1 214
OSCE Scenario 8.2 214
OSCE Scenario 8.3 214
9 Cardiovascular system 215
Cardiac Muscle 215
Cardiac action potential (Fig. 9.1) 215
Phase 0 215
Phase 1 215
Phase 2 215
Phase 3 216
Phase 4 216
Excitation/contraction coupling 216
Generation and conduction of cardiac impulse 216
Generation of cardiac output 216
Phases of the Cardiac Cycle (Fig. 9.2) 216
Phase IVc 217
Phase I 217
Phase IIa 217
Phase IIb 217
Phase III 217
Phase IVa 217
Phase IVb 217
Intracardiac Pressures 217
Heart Sounds 218
First heart sound 218
Second heart sound 218
Third heart sound 218
Fourth heart sound 218
Venous Pulse (Fig. 9.4) 218
a-wave 218
c-wave 218
v-wave 218
x-descent 218
y-descent 218
Coronary Circulation 218
Cardiac Output (CO) 219
Regulation of cardiac output 219
Starling’s law of the heart (Fig. 9.5) 219
Factors modifying cardiac output 219
1 Contractility 219
2 Preload 220
3 Afterload 220
Measurement of Cardiac Output 220
Fick method 220
Thermodilution 220
Dye dilution 220
Doppler ultrasound 220
Blood Pressure 220
Control of blood pressure (general systemic blood pressure) 221
Factors determining arterial blood pressure 221
Control of local blood pressure and blood flow 221
Peripheral Resistance (Systemic Vascular Resistance; Svr) 221
Monitoring the Circulation 221
ECG 221
Blood pressure 221
Central venous pressure 222
Pulmonary capillary wedge pressure (pulmonary artery occlusion pressure; PAOP) 223
Pulse oximetry 223
Cardiac output 223
Urine output 223
Echocardiography 223
Echo doppler 223
Cardiovascular Support 223
Ventilate 223
Infusion 223
Pump 223
Pharmacological Support 224
Adrenaline 224
Noradrenaline 224
Isoprenaline 224
Dopamine 224
Dobutamine 224
Dopexamine 224
Vasodilators 224
Phosphodiesterase inhibitors 224
OSCE Scenarios 225
OSCE Scenario 9.1 225
OSCE Scenario 9.2 225
OSCE Scenario 9.3 225
10 Gastrointestinal system 226
Functions 226
Nervous and Hormonal Regulation Within the GI Tract 226
Nervous regulation 226
Hormones and neurotransmitters 226
Oral Cavity, Pharynx and Oesophagus 226
Chewing 226
Saliva 227
Swallowing 227
Oesophageal sphincter 227
Stomach 227
Gastric mucosa 227
Gastric secretion 228
Gastric acid (Fig. 10.1) 228
Pepsinogen secretion 229
Mucus secretion 229
Intrinsic factor secretion 229
Regulation of gastric secretion 229
Gastric motility 229
Storage 229
Mixing and propulsion 229
Clinical physiology 230
Vomiting 230
Treatment of peptic ulceration 230
Medical treatment 230
Surgical treatment 231
Post-gastrectomy syndromes 231
Effects of vagotomy 231
Small Intestine 231
Small intestine mucosa 231
Absorption (Table 10.1) 233
Carbohydrates (Fig. 10.3) 233
Fats (Fig. 10.4) 233
Protein (Fig. 10.5) 234
Fluids and electrolytes 234
Vitamins 234
Iron 234
Calcium 235
Small intestinal motility 235
Clinical physiology 235
Physiological effects of duodenal resection 235
Physiological effects of terminal ileal resection 235
Pancreas 235
Exocrine secretions 235
Fluid component 235
Enzyme component 236
Proteolytic enzymes 236
Amylase 236
Lipolytic enzymes 236
Regulation of exocrine secretions 236
Cephalic 236
Gastric 236
Intestinal 236
Endocrine secretions 236
Clinical physiology 236
Physiological effects of pancreatic resection 236
Liver and Gall Bladder 236
Liver 236
Bile production (Fig. 10.6) 236
Metabolic functions 238
Carbohydrate metabolism 238
Protein metabolism 238
Lipid metabolism 238
Protein synthesis 238
Vitamin D activation 238
Detoxification 238
Vitamin and mineral storage 238
Phagocytosis 239
Haemopoiesis 239
Clinical physiology 239
Jaundice 239
Prehepatic jaundice 239
Hepatocellular jaundice 239
Cholestatic jaundice 240
Gall bladder 240
Clinical physiology 240
Physiological effects of cholecystectomy 240
Water absorption 240
Colonic flora 240
Large intestinal motility 240
Defecation 241
Clinical physiology 242
Diarrhoea 242
Osmotic 242
Secretory 242
Inflammatory 242
Abnormal motility 242
Constipation (Box 10.1) 242
Nutrition 242
Requirements 242
Regulation 243
Osce Scenarios 244
OSCE Scenario 10.1 244
OSCE Scenario 10.2 244
OSCE Scenario 10.3 244
11 Urinary system 245
Components 245
Functions 245
Structure 245
Renal Blood Supply 245
Renal circulation 245
Regulation of renal blood flow 245
Glomerulus (Fig. 11.1) 246
Microscopic structure 246
Glomerular filtration 246
Proximal convoluted tubule 246
Loop of Henle 247
Countercurrent multiplier mechanism (Fig. 11.2) 247
Distal convoluted tubule and collecting ducts 248
Regulation of Na+ and Water Reabsorption 248
Antidiuretic hormone 248
Renin–angiotensin–aldosterone system (RAS) 248
Atrial natriuretic peptide (ANP) 248
Ion and nutrient reabsorption 249
Potassium 249
Calcium and phosphate 249
Hydrogen and bicarbonate (Fig. 11.3) 249
Glucose and amino acids 250
Urea 250
Glomerular Filtration Rate (GFR) and Renal Plasma Flow 250
Measuring GFR 250
Measuring renal plasma flow 250
Micturition 250
Clinical Physiology 251
Bladder function and spinal injury 251
Hormone Production 251
Renin 251
Erythropoietin 252
1α-hydroxylase 252
OSCE Scenarios 252
OSCE Scenario 11.1 252
OSCE Scenario 11.2 252
OSCE Scenario 11.3 252
12 Endocrine system 253
Introduction 253
Pituitary and Hypothalamic Function 253
Control of pituitary function 253
Anterior pituitary 253
Posterior pituitary 253
Anterior pituitary hormones 253
Adrenocorticotrophic hormone (ACTH) 253
Thyroid-stimulating hormone (TSH) 254
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) 254
Prolactin 254
Growth hormone (GH) 254
Posterior pituitary hormones 254
Oxytocin 254
Antidiuretic hormone 254
Clinical physiology 254
Pituitary disorders 254
Increased hormone secretion 254
Decreased hormone secretion 254
Thyroid Function 254
Anatomy 254
Synthesis of thyroid hormone (Fig. 12.1) 255
Clinical physiology 255
Antithyroid drugs 255
Secretion and transport of thyroid hormone 255
Effects of thyroid hormone 255
Clinical physiology 256
Thyroid disorders 256
Hyperthyroidism 256
Hypothyroidism 256
Sick euthyroid syndrome 256
Calcium and Phosphate Regulation 257
Calcium 257
Regulation of calcium balance 258
Parathormone 258
Vitamin D 259
Calcitonin 259
Regulation of phosphate balance 259
Clinical physiology 259
Disorders of calcium and phosphate balance 259
Hypoparathyroidism 259
Hyperparathyroidism 259
Vitamin D deficiency 259
Hypocalcaemia 260
Hypercalcaemia 260
Hypophosphataemia 260
Hyperphosphataemia 260
Adrenal Function 260
Cortex 261
Synthesis and excretion 261
Actions of the adrenal cortex hormones 261
Aldosterone 261
Cortisol 261
Androgens 262
Medulla 262
Clinical physiology 262
Disorders of adrenal function 262
Addison’s disease 262
Hyperaldosteronism 263
Cushing’s disease/syndrome 263
Adrenogenital syndrome 263
Phaeochromocytoma 264
Growth hormone 264
Clinical physiology 265
Disorders of growth hormone secretion 265
Gigantism 265
Acromegaly 266
Endocrine Function of the Pancreas 266
Insulin 267
III Pathology 291
14 Cellular injury 293
Mechanisms of Cellular Injury 293
Cell Death 293
Necrosis 293
Coagulative necrosis 293
Colliquative necrosis 293
Caseous necrosis 293
Gangrenous necrosis 293
Fibrinoid necrosis 294
Fat necrosis 294
Apoptosis 294
Function of apoptosis 294
Mediators of apoptosis 294
p53 294
bcl-2 294
fas (CD 95) 294
Caspases 294
Morphological features of apoptosis 294
Diseases of increased apoptosis 295
Diseases of decreased apoptosis 295
The Process of Healing 295
Regeneration and repair 295
Cell renewal 295
Repair 295
Granulation tissue 295
Clinical problems with organization and wound contraction 295
Organization 295
Wound contraction 295
Injuries to Specific Tissues 295
Skin 295
Skin anatomy (Fig. 14.1) 295
Incised wound (surgical incision) – healing by first intention 295
Tissue loss – healing by second intention 296
Abnormalities of skin healing 296
Keloid 296
Hypertrophied scar 296
Anatomy of repair of defects 296
Reconstructive ladder (Fig. 14.3) 296
Grafts 297
Skin grafts 297
Mechanism of skin graft take 297
Split-thickness skin grafts (Fig. 14.4) 297
Full-thickness skin grafts (Fig. 14.5) 298
Flaps 298
Classification 299
Local flaps 299
Transposition flap (Fig. 14.9A) 299
Rotation flap (Fig. 14.9B) 299
Advancement flap (Fig. 14.9C) 300
Z-plasty (Fig. 14.9D) 300
Free flaps (Fig. 14.10) 300
Radial forearm flap 301
Anterolateral thigh flap 301
Deep inferior epigastric perforator (DIEP)/transverse rectus abdominis myocutaneous (TRAM) flap 301
Bone 301
Factors affecting bone healing 302
Liver 302
Kidney 302
Cardiac muscle 302
Neural tissue 302
Peritoneum 302
Gastrointestinal tract 303
Mucosal erosions 303
Mucosal ulcers 303
Gastrointestinal anastomoses 303
Factors affecting wound healing 303
Local 303
Systemic 304
Injury Due to Ionizing Radiation 304
Mode of action 304
Effects on tissues 304
Effect on individual tissues 304
Bone marrow 304
Skin 304
Intestines 305
Gonads 305
Lung 305
Kidney 305
Whole-body irradiation 305
Ultraviolet light 305
Therapeutic Irradiation 305
Radical applications 305
Adjuvant radiotherapy 305
Palliative radiotherapy 305
Fractionation of dose 305
Response modifiers 305
Injury Due to Burns 305
Types of burn 306
Thermal 306
Electrical 306
Chemical 306
Causes of burns 306
Predisposing medical conditions 306
Burn injury response 306
Local response (Fig. 14.11) 306
Systemic response 307
Carbon monoxide effects 307
Assessing a burn 307
The extent of body surface area burnt (Fig. 14.12) 308
The depth of the burn (Fig. 14.13) 308
OSCE Scenarios 310
OSCE Scenario 14.1 310
OSCE Scenario 14.2 310
OSCE Scenario 14.3 310
15 Disorders of growth, morphogenesis and differentiation 311
Growth 311
Cell turnover 311
Cell cycle 311
Phases of the cell cycle (Fig. 15.1) 311
Other factors involved in the cell cycle 311
Control of cell division 311
Therapeutic interruptions of cell cycle (Fig. 15.2) 311
Factors affecting growth 313
Genetic factors 313
Hormones 313
Nutrition 313
Blood supply 313
Oxygen supply 313
Nerve supply 313
Growth factors 313
Increased growth 313
Physiological hypertrophy and hyperplasia 313
Pathological hypertrophy 314
Pathological hyperplasia 314
Atrophy 314
Physiological (Box 15.1) 314
Pathological 314
Decreased growth (hypoplasia) 314
Differentiation 314
Control of differentiation 314
Morphogenesis 315
Congenital disorders of differentiation and morphogenesis 315
Chromosomal abnormalities affecting whole chromosomes 315
Chromosomal abnormalities affecting parts of chromosomes 315
Single gene alterations 315
Functional aspects of developmental disorders 315
Anomalies of organogenesis 315
Agenesis (aplasia) 315
Atresia 315
Hypoplasia 315
Dysgenesis (dysplasia) 316
Ectopia (heterotopia) 316
Acquired disorders of differentiation and growth 316
Metaplasia 316
Dysplasia 317
Polyps 317
Pathological processes causing polyps 317
Symptoms of polyps 317
Examples of polyps 317
Neoplasia 318
OSCE Scenarios 319
IV Appendix 447
Appendix OSCE scenario answers 449
OSCE Scenario Answer 1.1 449
OSCE Scenario Answer 1.2 449
OSCE Scenario Answer 1.3 450
OSCE Scenario Answer 2.1 450
Initial pain 450
Localized pain 451
OSCE Scenario Answer 2.2 451
OSCE Scenario Answer 2.3 452
OSCE Scenario Answer 3.1 452
OSCE Scenario Answer 3.2 453
OSCE Scenario Answer 3.3 453
OSCE Scenario Answer 4.1 453
OSCE Scenario Answer 4.2 454
OSCE Scenario Answer 4.3 454
OSCE Scenario Answer 5.1 455
OSCE Scenario Answer 5.2 455
OSCE Scenario Answer 5.3 456
OSCE Scenario Answer 6.1 456
OSCE Scenario Answer 6.2 456
OSCE Scenario Answer 6.3 457
OSCE Scenario Answer 7.1 457
OSCE Scenario Answer 7.2 458
OSCE Scenario Answer 7.3 458
OSCE Scenario Answer 8.1 459
OSCE Scenario Answer 8.2 459
OSCE Scenario Answer 8.3 460
OSCE Scenario Answer 9.1 460
OSCE Scenario Answer 9.2 461
OSCE Scenario Answer 9.3 462
OSCE Scenario Answer 10.1 462
OSCE Scenario Answer 10.2 463
OSCE Scenario Answer 10.3 463
OSCE Scenario Answer 11.1 464
OSCE Scenario Answer 11.2 464
OSCE Scenario Answer 11.3 465
OSCE Scenario Answer 12.1 465
OSCE Scenario Answer 12.2 466
OSCE Scenario Answer 12.3 466
OSCE Scenario Answer 13.1 467
OSCE Scenario Answer 13.2 467
OSCE Scenario Answer 13.3 468
OSCE Scenario Answer 14.1 468
History 468
Examination 468
Investigations 469
Management 469
OSCE Scenario Answer 14.2 469
OSCE Scenario Answer 14.3 470
OSCE Scenario Answer 15.1 471
OSCE Scenario Answer 15.2 471
History 471
Examination 471
Investigations 472
Management 472
OSCE Scenario Answer 15.3 472
OSCE Scenario Answer 16.1 472
History 472
Examination 473
Investigations 473
OSCE Scenario Answer 16.2 473
OSCE Scenario Answer 16.3 474
OSCE Scenario Answer 17.1 475
Examination 475
Investigations 475
OSCE Scenario Answer 17.2 475
OSCE Scenario Answer 17.3 476
OSCE Scenario Answer 18.1 477
OSCE Scenario Answer 18.2 478
OSCE Scenario Answer 18.3 479
OSCE Scenario Answer 19.1 480
Symptoms 480
Signs 480
OSCE Scenario Answer 19.2 480
OSCE Scenario Answer 19.3 481
OSCE Scenario Answer 20.1 482
Questions 482
Investigations 482
Possible further investigations 482
OSCE Scenario Answer 20.2 482
OSCE Scenario Answer 20.3 483
OSCE Scenario Answer 21.1 483
Investigations 483
Management 484
OSCE Scenario Answer 21.2 484
OSCE Scenario Answer 21.3 484
OSCE Scenario Answer 22.1 485
Histopathologically 485
Clinically 485
OSCE Scenario Answer 22.2 486
Medical 486
Surgical 486
OSCE Scenario Answer 22.3 486
Types of pneumothorax 487
Causes 487
Treatment 487
OSCE Scenario Answer 22.4 487
OSCE Scenario Answer 22.5 488
OSCE Scenario Answer 22.6 489
OSCE Scenario Answer 22.7 489
Pre-hepatic jaundice 489
Hepatic jaundice 490
Post-hepatic/cholestatic jaundice 490
Index 491
A 491
B 494
C 496
D 499
E 500
F 501
G 503
H 504
I 506
J 508
K 508
L 508
M 510
N 512
O 513
P 514
Q 517
R 518
S 519
T 523
U 525
V 526
W 527
X 527
Y 527
Z 527