MRCS Part A

# 79 PRE- AND POST-OPERATIVE OPTIMISATION The perioperative period — the hours and days surrounding an operation — is where most preventable surgical morbidity is made or avoided. Good surgeons don't just operate well; they identify risk, modify it where they can, and recognise complications early. This lesson covers the

# Allergy & Hypersensitivity Hypersensitivity is an exaggerated or inappropriate immune response to an antigen that would normally be harmless or only mildly noxious. The damage is done by the immune system, not the antigen itself. The Gell-Coombs classification (I–IV) remains the framework MRCS examiners use, and almost every

# 65 STATISTICS, EVIDENCE & INCIDENTS Statistics, evidence-based medicine and clinical governance form a small but reliable slice of MRCS Part A. The questions are not about being a statistician — they are about whether you can pick the right test, interpret a 2×2 table, recognise a study design, and

# 66 COAGULATION & ANTICOAGULANTS Detailed notes Haemostasis is the body's response to vessel injury. It must be fast enough to stop blood loss, but tightly regulated to avoid pathological thrombosis. The MRCS Part A consistently tests three things here: the cascade, the drugs that target it, and the

# 63 INCONTINENCE & ERECTILE DYSFUNCTION Detailed notes Bladder anatomy and embryology The bladder is a hollow muscular reservoir lined with transitional epithelium (urothelium). Two regions matter for the exam, because they have different origins and different behaviour. The body of the bladder (dome and walls) is derived from the endodermal

# Detailed notes The stomach is a muscular reservoir that mechanically churns food, sterilises it with acid, begins protein digestion and meters chyme into the duodenum. Understanding it for MRCS Part A means understanding three things together: which cell secretes what, how acid secretion is switched on and off, and what

# THORACIC ANATOMY & PATHOLOGY Detailed notes The thorax is the busiest crossroads in human anatomy. Three organ systems share a single bony cage, and the surgical questions in MRCS Part A circle the same anatomical relationships again and again — which structure lies behind the sternum at the 5th ICS, where

# 27 ANAESTHETICS, SEDATION & ANALGESIA 👩‍⚕️ Anaesthetics is predictable territory in MRCS Part A. Examiners return to the same cluster: LA dose calculations, the WHO ladder, ketamine in shock, opioid reversal, malignant hyperthermia, and suxamethonium contraindications. Recite the antidotes cold and calculate a lidocaine maximum in under thirty seconds — easy marks.

# 39 CALCIUM & BONE DISEASE Calcium is one of the most tightly regulated ions in the body. The plasma calcium concentration is held within roughly 2.2–2.6 mmol/L because even small deviations disrupt neuromuscular excitability, cardiac contractility and coagulation. The MRCS examiners love this topic because a

# 23 SHOCK, VASOPRESSORS & FLUIDS What is shock? Shock is circulatory failure causing inadequate tissue oxygen delivery. It is not defined by blood pressure — a normotensive patient can be in shock and a hypotensive one can be well perfused. The defining problem is cellular: O₂ supply fails to meet demand,