Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Left ventricular M‐mode tracing recorded with the intracardiac ultrasound probe positioned at the right ventricular septum at baseline sinus rhythm, 95beats per minute (bpm), and 125bpm in controls and in patients with heart failure with preserved ejection fraction (HFpEF). SR indicates sarcoplasmic reticulum.
