Fig. 2
From: Adverse clinical events caused by pacemaker battery depletion: two case reports
ECG (a and b: at presentation). a: Completely dissociated P waves (black arrows) and wide QRS complexes. The rhythm strip showed complete atrioventricular(AV) block. The QRS complexes were wide because of the presence of right bundle branch block and left posterior fascicular block, representing the AV block is infranodal. QT intervals were prolonged (QTc 550 ms) and premature ventricular contraction(PVC) was present (black star). b: Complete AV block with wide QRS complexes, frequent PVCs were present. The first PVC occurred on the downslope of the T wave, which induced a polymorphic ventricular tachycardia with changing QRS complex amplitudes, which was known as torsade de pointes(TdP)