Doppler and stethoscope heartbeat [with ECG]

Stole the idea from:    • 【心音】聴診器＆ドップラー / Stethoscope and Doppler【He...   and    • [Audio] - Doppler & Steth Breath Hold   Breathhold version:    • Doppler and stethoscope breathhold heartbe...   Tumblr: yetanothercardiophile