| 1 | They can produce a "ball valve" effect by intermittently occluding the atrioventricular valve orifice. | |
| 2 | It is characterized by sinoatrial node dysfunction and often includes atrioventricular node disease and bundle branch block. | |
| 3 | These transitory accessory connections may act as substrate for AV reentrant tachycardias in fetuses or neonates. | |
| 4 | There was first-degree AV block in 5 patients (2.7%) documented by electrocardiogram and in 9 patients(7.6%) revealed during Holter monitoring. | |
| 5 | The team "strongly recommends" electrocardiogram (ECG) monitoring of all such patients to look for the development of atrioventricular block and symptomatic bradycardia. |
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