Sinus rhythm refers to the normal rhythm of the heartbeat. It means that the electrical signals controlling the heart's contractions follow a regular, steady pattern, like a well-behaved wave. Full definition
Electrocardiographs of both dogs were recorded and showed normal sinus rhythm with deep S wave. (tci-thaijo.org)
Nadiia Rozmaritsa (Ravens, TUD)-- «Regulation of Ca2 + - handling proteins by nitric oxide in atrial myocytes from patients in sinus rhythm and atrial fibrillation» (2012) (dresden-ipp.de)
The new antiarrhythmic drug vernakalant: ex vivo study of human atrial tissue from sinus rhythm and chronic atrial fibrillation. (dresden-ipp.de)