Koishikawa Cardiology Clinic, located in Koishikawa, Bunkyo-ku, Tokyo, is an internal medicine clinic specializing in cardiovascular diseases. The clinic focuses on the diagnosis and treatment of cardiovascular conditions such as atrial fibrillation, angina pectoris, and myocardial infarction, combining physiological testing and oral medication tailored to each patient's symptoms and condition, with referral coordination to specialized hospitals when necessary. The clinic also maintains a comprehensive care system for sleep apnea syndrome, offering at-home simplified testing to evaluate snoring and apnea during sleep, and providing CPAP therapy based on disease severity. In addition, the clinic provides a broad range of internal medicine services beyond cardiology, including an obesity treatment clinic (self-funded), subcutaneous Xolair injections and sublingual immunotherapy for cedar pollen allergy, various vaccinations, and investigation of chronic cough causes. Consulting hours are 9:00 to 13:00 in the morning and 15:00 to 19:00 in the afternoon, with Sundays and public holidays closed. The facility is barrier-free, providing an accessible environment for patients who may feel uneasy about hospital visits.