Topics for Anatomy and Physiology
Find educational topics for Anatomy and Physiology aligned with the Zambian tertiary curriculum.
Esophageal Cancer: Squamous vs Adenocarcinoma
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Esophageal cancer is the SIXTH LEADING CAUSE OF CANCER DEATH worldwide, with TWO MAIN HISTOLOGIC TYPES: SQUAMOUS CELL CARCINOMA (SCC) and ADENOCARCINOMA (AC). For Zambian students, SCC is the DOMINANT TYPE (80-90%), with HIGH INCIDENCE in parts of Africa (esophageal cancer belt). EPIDEMIOLOGY: SCC: Sub-Saharan Africa, Asia, Middle East. Risk …
Achalasia
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Achalasia is a rare, chronic, progressive esophageal motility disorder characterized by INADEQUATE LOWER ESOPHAGEAL SPHINCTER (LES) RELAXATION and LOSS OF ESOPHAGEAL PERISTALSIS. For Zambian students, it is a key differential diagnosis for DYSPHAGIA (solids and liquids) and should not be mistaken for malignancy. PATHOPHYSIOLOGY: Idiopathic. Autoimmune? Viral trigger? → inflammatory …
Esophageal Webs and Rings
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Esophageal webs and rings are thin, membranous, or muscular structures causing luminal narrowing and intermittent dysphagia. For Zambian students, Schatzki ring is COMMON, Plummer-Vinson syndrome (PVS, Paterson-Brown-Kelly) is RARE but important—associated with IRON DEFICIENCY and POSTCRICOID DYSPHAGIA, plus increased risk of ESOPHAGEAL SCC. SCHATZKI RING: Type B (mucosal) ring, at …
Esophageal Diverticula
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Esophageal diverticula are outpouchings of one or more layers of the esophageal wall, classified by location: PHARYNGOESOPHAGEAL (ZENKER'S DIVERTICULUM, most common), MIDE SOPHAGEAL (TRACTION, usually benign), and EPIPHRENIC (PULSION, above LES). For Zambian students, Zenker's diverticulum is the most clinically relevant. ZENKER'S DIVERTICULUM: PATHOPHYSIOLOGY: Pulsion diverticulum through KILLIAN'S DEHISCENCE (between …
Caustic Esophageal Injury
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Caustic ingestion is a devastating medical emergency, causing severe, often irreversible injury to the esophagus and stomach. For Zambian students, this is a CRITICAL, TIME-SENSITIVE PRESENTATION, particularly in children (accidental) and adults (suicidal). Alkali (NaOH, drain cleaner) > Acid. PATHOPHYSIOLOGY: ALKALI: LIQUEFACTIVE NECROSIS, deep penetration, thrombosis, severe esophageal injury (stricture, …
Mallory-Weiss Syndrome
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Mallory-Weiss syndrome (MWS) is a NON-PENETRATING MUCOSAL TEAR at the gastroesophageal junction or gastric cardia, caused by forceful retching, vomiting, or straining. For Zambian students, MWS is a COMMON CAUSE of UPPER GI BLEEDING (5-15%), usually SELF-LIMITED, benign. PATHOPHYSIOLOGY: Sudden, marked increase in intra-abdominal pressure against a closed glottis → …
Boerhaave Syndrome
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Boerhaave syndrome is a LIFE-THREATENING, FULL-THICKNESS PERFORATION of the esophagus, caused by a sudden, massive increase in intraesophageal pressure (forceful vomiting). It is a SURGICAL EMERGENCY with HIGH MORTALITY (20-50%) if not promptly diagnosed and treated. For Zambian students, Boerhaave is a RARE but CATASTROPHIC DIAGNOSIS, frequently missed, and requires …
Peptic Ulcer Disease: Pathophysiology and Clinical Spectrum
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Peptic ulcer disease (PUD) refers to mucosal defects in the stomach (gastric ulcer, GU) or proximal duodenum (duodenal ulcer, DU) that extend through the muscularis mucosae. For Zambian students, PUD is EXTREMELY COMMON, with Helicobacter pylori as the dominant etiology. NSAID use is increasing. MASTERY OF PUD PATHOPHYSIOLOGY, CLINICAL PRESENTATION, …
Helicobacter pylori: Diagnosis and Management
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Helicobacter pylori is a Gram-negative, microaerophilic, spiral-shaped bacterium that colonizes the human gastric mucosa, affecting over 50% of the world's population. For Zambian students, H. pylori is a MAJOR PUBLIC HEALTH PROBLEM, with prevalence exceeding 70-80% in many African populations. It is the PRIMARY CAUSE of PEPTIC ULCER DISEASE and …