[Provocation of the attack of supraventricular reciprocal paroxysmal tachycardia by frequent stimulation of the left atrium through the esophagus to determine its approximate range of reciprocal excitement].
The study involved 24 patients with supraventricular paroxysmal reciprocal tachycardia (SPRT) showing no ECG evidence of ventricular pre-excitation between the attacks. SPRT attacks could be provoked by frequent esophageal left-atrial stimulation in all patients, particularly with impulse frequencies in the 160 to 200 imp/min range, associated with first-degree atrioventricular block featuring Wenckebach's phenomenon. In most cases, induced SPRT was similar to a spontaneous attack. During an induced attack, the duration of Q--P interval was less than 70 ms in 15 (62.5%) suggesting that the scope of reciprocal excitation was limited to the atrioventricular node, and more than 70 ms in 9 (37.5%), indicating the involvement of complementary ventriculo-atrial pathways.
A I
AI
Lukoshiavichiute
D A
DA
Gedrimene
D000293:Adolescent; D000328:Adult; D000368:Aged; D001283:Atrioventricular Node / Q000503:physiopathology; D004558:Electric Stimulation / Q000379:methods; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009434:Neural Pathways / Q000503:physiopathology; D013614:Tachycardia, Paroxysmal / Q000175:diagnosis / Q000209:etiology*
Provokatsiia pristupa nadzheludochkovoĭ vozvratnoĭ paroksizmal'noĭ takhikardii pri pomoshchi chastoĭ stimuliatsii levogo predserdiia cherez pishchevodas tsel'iu opredeleniia ee orientirovochnogo kruga vozvratnogo vozbuzhdeniia.