In cardiology,<unk>  is a difference in the timing, or lack of synchrony, of contractions in different ventricles in the heart. Large differences in timing of contractions can reduce cardiac efficiency and is correlated with heart failure.
Ventricular dyssynchrony
Pacemaker crosstalk
Premature junctional contraction
Dorsal intercalated segment instability
Premature atrial contraction
Sinus node dysfunction
Premature ventricular contraction
Junctional escape beat