case_images: PMC10284657_01
case_images: Presenting ECG, which demonstrates third-degree AV block with a narrow complex ventricular escape rhythm of 36 BPM.
case_images: CRIC2023-8664315.001.jpg
case_images: PMC10284657_01_CRIC2023-8664315.001.jpg
case_images: fig1
case_images: Several electrocardiograms (ECGs) performed at the time of presentation in the emergency department demonstrated third-degree AV block (Figure 1).
case_images: Follow-up ECG, which demonstrates first-degree AV block with markedly prolonged PR interval of 512 ms.
case_images: CRIC2023-8664315.002.jpg
case_images: PMC10284657_01_CRIC2023-8664315.002.jpg
case_images: fig2
case_images: The transition to first-degree AV block was later confirmed on an ECG performed about 10 hours after arrival (Figure 2).
case_images: ECG stress test at peak exercise, which demonstrates intermittent high-grade 2 : 1 AV block.
case_images: CRIC2023-8664315.003.jpg
case_images: PMC10284657_01_CRIC2023-8664315.003.jpg
case_images: fig3
case_images: Subsequently, during an exercise ECG stress test, the patient was found to have high-grade intermittent 2 : 1 second-degree AV block at rest and with exertion (Figure 3).