A 45-year-old man presents to the emergency department with sudden-onset severe epigastric pain and left lower chest pain radiating to the back, following a bout of forceful vomiting after heavy alcohol consumption. On examination, there is crepitus palpable in the neck and left chest wall. Chest X-ray shows pneumomediastinum with left pleural effusion. The structure marked **A** in the diagram represents the pathology in this patient. Which of the following best describes the mechanism of injury in this condition?
A. Rupture of an esophageal diverticulum due to increased intraluminal pressure
B. Sudden rise in intraesophageal pressure against a closed cricopharyngeus during forceful vomiting, causing barogenic full-thickness longitudinal tear
C. Instrumentation-related perforation during endoscopic evaluation
D. Chronic acid reflux causing mucosal erosion and submucosal tear at the gastroesophageal junction
Explanation
Why option 1 is correct
Boerhaave syndrome is defined as a spontaneous esophageal perforation caused by a sudden rise in intraesophageal pressure against a closed cricopharyngeus during forceful vomiting or retching. This barogenic mechanism produces a full-thickness longitudinal tear, typically in the left posterolateral wall of the distal esophagus 2–3 cm above the gastroesophageal junction—the anatomically weakest area lacking external supporting structures. The clinical presentation (Mackler triad: vomiting, severe chest/epigastric pain, subcutaneous emphysema with Hamman's crunch) and imaging findings (pneumomediastinum, left pleural effusion) are pathognomonic for this diagnosis. [Sabiston 21e Ch 41; SAGES Esophageal Perforation Guidelines]
Why each distractor is wrong
Option 2 (Chronic acid reflux): This describes the mechanism of Mallory-Weiss tear, which is a mucosal or submucosal tear at the gastroesophageal junction, self-limited, and does not cause mediastinitis or the full-thickness perforation seen in structure A.
Option 3 (Instrumentation-related): While iatrogenic perforation from endoscopic instrumentation is the most common cause of esophageal perforation overall, it is distinct from Boerhaave syndrome, which is spontaneous and barogenic, not procedure-related.
Option 4 (Diverticulum rupture): Zenker diverticulum (structure C) may perforate but does not result from the acute barogenic mechanism of forceful vomiting against a closed cricopharyngeus; it is a chronic outpouching.
High-YieldNEET PG
Boerhaave syndrome = sudden ↑ intraesophageal pressure + closed cricopharyngeus + forceful vomiting → full-thickness barogenic tear in left posterolateral distal esophagus → mediastinitis within hours → surgical emergency.
