Severe metabolic alkalosis due to pyloric obstruction: case presentation, evaluation, and management.

A 46-year-old man presented to the emergency room with severe metabolic alkalosis, hypokalemia, and respiratory failure requiring intubation and mechanical ventilation. The cause of his acid-base disorder was initially unclear. Although alkalosis is common in the intensive care unit, metabolic alkalosis of this severity is unusual, carries a very high mortality rate, and requires careful attention to the pathophysiology and differential diagnosis to effectively evaluate and treat the patient. A central concept in the diagnosis of metabolic alkalosis is distinguishing chloride responsive and chloride nonresponsive states. Further studies are then guided by the history and physical examination in most cases. By using a systematic approach to the differential diagnosis, we were able to determine that a high-grade gastric outlet obstruction was the cause of the patients' alkalosis and to offer effective therapy for his condition. A literature review and algorithm for the diagnosis and management of metabolic alkalosis are also presented.