[Identification of the sino-atrial potential in the dog by epicardial electrocardiography].
The electrical activity of the sino-atrial node has been recorded in the dog through a thoracotomy and using both unipolar and bipolar electrodes. Amiodarone was used to establish that the pre-artial potential which was registered was indeed originating in the sinus, as it allowed us to produce various degrees of sino-atrial block in a reliable and reproducable manner. The fact that the sinus potential can be recorded in the presence of intermittent abnormalities of the surface P wave suggests that the abnormalities may be associated with intra-sinus displacement of the pacemaker and not with ectopic depolarisation of the atrium.
D000638:Amiodarone / Q000494:pharmacology; D000818:Animals; D002304:Cardiac Pacing, Artificial; D004285:Dogs; D004562:Electrocardiography / Q000379:methods*; D012848:Sinoatrial Block / Q000503:physiopathology; D012849:Sinoatrial Node / Q000187:drug effects / Q000502:physiology* / Q000503:physiopathology
D000638:Amiodarone
Identification du potentiel sinusal chez le chien par électrocardiographie épicardique.