Fatal postoperative systemic pulmonary hypertension in benfluorex-induced valvular heart disease surgery: A case report.

Rationale: Drug-induced valvular heart disease (DI-VHD) remains an under-recognized entity.

Patient Concerns: This report describes a heart valve replacement which was complicated by intractable systemic pulmonary arterial hypertension in a 61-year-old female with severe restrictive mitral and aortic disease. The diagnosis of valvular disease was preceded by a history of unexplained respiratory distress. The patient had been exposed to benfluorex for 6.5 years.

Diagnoses: The diagnostic procedure documented specific drug-induced valvular fibrosis.

Interventions: Surgical mitral and aortic valve replacement was performed.

Outcomes: Heart valve replacement was postoperatively complicated by unanticipated disproportionate pulmonary hypertension. This issue was fatal despite intensive care including prolonged extracorporeal life support.

Lessons: Benfluorex is a fenfluramine derivative which has been marketed between 1976 and 2009. Although norfenfluramine is the common active and toxic metabolite of all fenfluramine derivatives, the valvular and pulmonary arterial toxicity of benfluorex was much less known than that of fenfluramine and dexfenfluramine. The vast majority of benfluorex-induced valvular heart disease remains misdiagnosed as hypothetical rheumatic fever due to similarities between both etiologies. Better recognition of DI-VHD is likely to improve patient outcome.