A 58-year-old man, who had been in good health, became infuriated after a quarrel with his wife for 20 minutes. He suddenly experienced severe chest tightness with breathing difficulty and collapsed. After resuscitation, he was brought to Emergency Department, where he was found to be in a delirious state with laborious breathing. He was afebrile (BT 35.8 °C). BP measured 122/74 mmHg, PR 33/min, and RR 28/min. He was intubated for assisted breathing, followed by transvenous insertion of a temporary pacemaker because of a complete A-V block shown on the ECG. Reportedly, one week before admission, he did have a “cold,” for which he took analgesics for muscle aches. He had no sore throat, fever, chills, or skin rash and had no recent travel. There were no abnormal focal neurological signs. Complete blood counts were normal. Notably, BNP was 475 (N <100) pg/mL, and serum cardiac and liver enzymes were elevated (CK-MB 21.3 [N <5] ng/mL, Tn-I 3.77 [N <0.5] ng/mL, SGOT 183 [N 0-40] U/L, SGPT 109 [N 0-40] U/L). BUN and Cr were 20.9 [6.7-21.3] and 1.8 [N 0.4-1.4] mg/dL, respectively, and eGFR 41.84 ml/min. Serum Na was 133 (N 134-148) mEq/L and K 3.3 (3.4-4.8) mEq/L. The chest X-ray showed normal cardiac size with increased lung markings, suggesting mild pulmonary congestion. Subsequently, cardiac catheterization revealed normal coronary arteries alongside a slightly dilated, globally hypokinetic LV (EF 39.81%). Echocardiography showed impaired LV contractility with global LV hypokinesis (LV EF 39.81). He gradually regained consciousness, and repeated echocardiography revealed preserved LV contractility (LV EF 65%) and diastolic dysfunction after three weeks of hospitalization. However, he had remained in complete AV block throughout and was discharged with a permanent pacemaker.