PMC6683799_01
ECG during bradycardia showed a second-degree AV block with an atrial frequency of 130/min and a ventricular frequency of 65/min. QRS 76 ms; QTc 590 ms. Red arrows are pointed towards the P-waves, at times hidden in the T-waves. Settings 25 mm/s; 10 mm/mV.
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fig1
Evaluation of the electrocardiogram (ECG) showed a second-degree atrioventricular (AV) block (Figure 1).
Illustration of the curve of the heartbeat with episodes of a sudden bradycardia (*) and spontaneous recovery to normal AV conduction (#). Y-axis: heart rate in beats per minute; X-axis: time in hours.
CRIPE2019-4013564.002.jpg
PMC6683799_01_CRIPE2019-4013564.002.jpg
fig2
ECG on the right showed normal heart frequency (131 beats/minute) with 1 : 1 AV conduction, with a left bundle branch block (QRS 120 ms). Settings 25 mm/s; 10 mm/mV.
CRIPE2019-4013564.003.jpg
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fig3
AV conduction. A 21-channel video EEG at that time showed no epileptic activity, suggesting bradycardia was not related to convulsions. A few hours later, bradycardia resolved spontaneously and ECG showed a left bundle branch block (Figure 3).