TY - JOUR T1 - Lesson of the month 1: Obesity hypoventilation (Pickwickian) syndrome: a reversible cause of severe pulmonary hypertension JF - Clinical Medicine JO - Clin Med SP - 578 LP - 581 DO - 10.7861/clinmedicine.17-6-578 VL - 17 IS - 6 AU - Frazer Warricker AU - Zafir Islam AU - Benoy N Shah Y1 - 2017/12/01 UR - http://www.rcpjournals.org/content/17/6/578.abstract N2 - Obesity hypoventilation syndrome (OHS) is a condition in which an individual with a body mass index >30 kg/m2 develops daytime alveolar hypoventilation (defined as a resting PaCO2 >45 mmHg) that cannot be attributed to other pathologies. It is a condition with increasing prevalence and rising cost to healthcare systems worldwide. Right heart failure and pulmonary hypertension are well-known complications of this syndrome. Here, we present the case of a female patient with OHS who presented to our centre with severe pulmonary hypertension, which resolved with appropriate treatment. We also review this clinical condition and its diagnosis and management. ER -