PMC7069049_01
ECG tracings of the patients (25 mm/s,10 mm/mV). a Atrial fibrillation (sinus:131 bpm) (d + 9) b Premature onset,sinus arrest or sinus block (d + 18). Sudden chest tightness, shortness of breath, followed by ass attack was occurred. c Borderline escape rhythm with sinus capture (d + 22). A temporary heart pacemaker had been placed for 3 days. d Spontaneous rhythm and pacemaker heart rate alternately appear (d + 28)
40959_2020_59_Fig1_HTML.jpg
PMC7069049_01_40959_2020_59_Fig1_HTML.jpg
Fig1
On d + 9, she felt palpitation again, ECG revealing paroxysmal AF and atrial flutter, then she was treated with metoprolol tartrate again, however, it didn't improve her symptoms (Fig. 1a). However, she developed chest tightness, shortness of breath, followed by ass attack on d + 18(Fig. 1b). Long intervals of RR with more than 2 s (13 times), and the longest RR was 4.1 s. 3) junctional escape rhythm and escape beat were observed sometimes. 4) ventricular pacing, ventricular intermittent pacing dysfunction. 5) frequent atrial premature (3917 times), partial two-triplet rhythm. 6) occasional ventricular premature (57 times) (Fig. 1c). On d + 28 because of sinus arrest and the long interval of RR, she was embedded in two-chamber permanent heart pacemaker (Fig. 1d).