PMC7218462_01
The patient's electrocardiogram in which the red arrows indicate the typical flutter waves (f-waves) that occur right before the QRS complex, simulating a pseudo-preexcitation pattern. The segment underscored in black indicates the f-waves in series at a rate of approximately 240 beats per minute. The QRS complexes are occurring at 120 to 140 beats per minute, hence the 2:1 atrioventricular block.
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The patient's chest radiograph does not indicate any airspace disease that would be expected in coronavirus-2019 (COVID-19) infection.
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A chest radiograph did not reveal any acute cardiopulmonary disease (see Figure 2), while a bedside 2-dimensional transthoracic echocardiogram demonstrated a preserved left ventricular ejection fraction, without any regional wall motion abnormalities.
The patient's rhythm strip post-cardioversion, which indicates coarse atrial fibrillation with a rapid ventricular response. The variable RR intervals highlighted by the interspersed red lines.
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Despite these therapies, the patient unsuccessfully underwent cardioversion with 100 J and subsequently transitioned to atrial fibrillation with rapid ventricular (AF RVR) response (see Figure 3).