PMC7313116_01
(a) Initial ECG taken at time 04:19 at our hospital demonstrating sinus bradycardia. (b) Repeat ECG at time 09:25 showing resolution of sinus bradycardia, but with marked sinus arrhythmia. (c) Repeat ECG at time 10:25 showing sinus rhythm and normal ECG.
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The heart rate had decreased from 106 beats per minute to 36 beats per minute (Figure 1(a)). Given her lab work and improving heart rate on ECGs (Figures 1(b) and 1(c)), the team was reassured that the patient's clinical status was improving.