Repetitive monomorphic ventricular tachycardia with a morphology of inferior axis and left bundle branch block pattern in patients without structural heart disease commonly originates from the right ventricular outflow tract. We report the case of a 22-year-old man with an incessant, monomorphic ventricular tachycardia with a similar morphology originating from the left coronary cusp, which was confirmed by perfect pace mapping, local ventricular activation preceding the onset of QRS by 25 mse, and eliminated by a single delivery of low-energy (11 W) radiofrequency currents.

Thyroid storm is a rare disorder with a sudden onset, rapid progression and high mortality. We experienced a case of thyroid storm which had a devastating course, including multiple organ failure (MOF), severe hypoglycemia, disseminated intravascular coagulation (DIC), and stroke. It was difficult to make a diagnosis of thyroid storm in the present patient, because she did not have a history of thyroid disease and her serum FT3 level was normal. Clinicians should be aware that thyroid storm can occur even when there is an almost normal level of thyroid hormones, and that intensive anticoagulation is required for patients with atrial fibrillation to prevent stroke after thyroid storm.

Polyarteritis nodosa (PAN) is a rare necrotizing vasculitis that occurs in small-to medium-sized muscular arteries. A 71-year-old man was admitted to our hospital for an evaluation of a sustained fever and he later died of cardiac arrest. The autopsy revealed that the patient had PAN and severe coronary vasculitis with no signs of cardiac ischemia. The reason for the patient's sudden death remains unclear; however, cardiac arrest due to coronary vasculitis was suggested. This is a rare case of PAN coronary vasculitis that led to sudden death without either stenosis or any embolism.

A 55-year-old woman with stage IV breast cancer was diagnosed with heart failure. Her left ventricular ejection fraction (LVEF) had decreased to 37.2%. Chemotherapy-related cardiac dysfunction (CTRCD) was suspected, and standard treatment for heart failure was initiated. After five months, her LVEF remained below 50% since she could not tolerate beta-blockers. Ivabradine was introduced, which remarkably improved her LVEF to 72.6% in only three months. Her myocardium was not dilated, which may be the reason that ivabradine was effective. Ivabradine has shown to be safe and effective in the treatment of CTRCD, and improved activities of daily living of an advanced-stage cancer patient.

An asymptomatic 65-year-old woman was identified with an oversized round-shaped hypoechoic lesion (62 mm in diameter) between right and left atria by echocardiogram. A contrast-enhanced 320-slice multidetector computed tomography demonstrated a giant aneurysmatic fistula branched from the left main coronary trunk towards right atrium. The patient underwent an elective surgical repair. The aneurysm was resected, followed by coronary artery bypass graft surgery using bilateral internal thoracic arteries. The surgery was successful, and the patient enjoys normal life without any symptoms for 15 months.