Blocked premature atrial contractions mimicking severe sinus bradycardia
Chang Hee Kwon · 2026
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Description
Chang Kwon reports a case where hidden early heartbeats mimicked a dangerously slow heart, in a 2026 article. A man in his seventies arrived with dizziness and breathlessness over two days. His pulse read near thirty beats per minute, an alarming low. He had earlier had two procedures to fix atrial fibrillation and took no rhythm drugs.
His heart tracing first looked like simple sinus bradycardia, a slow but orderly rhythm. Closer reading showed small extra beats buried in each T wave. Those early atrial beats came in pairs and never reached the lower chambers, since the relay node was still recovering. Each blocked beat also reset the heart's pacemaker, stretching the pauses. The case warns doctors to hunt for hidden beats before blaming the pacemaker itself.
Catalog record
| CREATOR | Chang Hee Kwon |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 3 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |