Jeffrey Song^1,, Tariq Sharman¹

Yohimbine is an Indoloquinolizidine alkaloid derived from the bark of the African tree Pausinystalia johimbe, as well as from the bark of the unrelated South American tree Aspidosperma quebracho-blanco. It is commonly sold as a dietary supplement for the purpose of enhancing libido, weight loss and natural bodybuilding aids. Yohimbine has high affinity for the α₂-adrenergic receptor, moderate affinity for the α₁ receptor, dopamine D₂ receptor, and weak affinity for the dopamine D₃ receptors and some of the serotonin receptors. Depending on dosage, Yohimbine can either increase or decrease systemic blood pressure (through vasoconstriction or vasodilation, respectively). We present a 51-year-old male who presented with substernal chest pressure and the sensation of a “pounding heart” after starting Yohimbine as a dietary supplement. He was found to have type II myocardial injury characterized by elevated troponin levels. We propose that the mechanism for this was 1) elevation of blood pressure and sinus tachycardia causing myocardial ischemia due to increased myocardial oxygen demand and supply mismatch, 2) cardiac norepinephrine release causing direct non-ischemic norepinephrine mediated myocardial injury and 3) increased sympathetic outflow mediated coronary vasoconstriction and spasm causing ischemia.

Yohimbine, Hypertension, Norepinephrine, α₂ receptor, Type II NSTEMI, Tachycardia, Erectile Dysfunction