Determinants of QRS alternans during narrow QRS tachycardia
نویسندگان
چکیده
منابع مشابه
Observations on patient with two tachycardia QRS alternans in a types of narrow QRS
1. Yasue H, Nagao M, Omote S, Takizawa A, Miwa K, Tanaka S: Coronary arterial spasm and Prinzmetal’s variant form of angina induced by hyperventilation and Tris-buffer infusion. Circulation 5856, 1978. 2. Girotti LA, Crosatto JR, Messuti H, Kaski JC, Dyszel E, Rivas CA, Araujo LI, Vetulli HD, Rosenbaum MB: The hyperventilation test as a method for developing successful therapy in Prinzmetal’s a...
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gram. Tachyeardias originating in the left bundle branch and documented by right, left, and His bundle recordings have been produced in animals given excessive digitalis. We have noted a similar tachycardia in a patient with ischemic heart disease receiving digitalis during hypokalemia. The QRS complexes were 0.10 sec in duration and by contour suggested an ectopic focus located in the posterio...
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An 80-year-old man underwent an electrophysiologic procedure because of recurrent episodes of supraventricular tachycardia. Episodes of nonsustained narrow QRS complex tachycardia occurred spontaneously after catheter placement. Examples of the onset and termination of an episode of tachycardia are shown in Figures 1 and 2, respectively. What is the mechanism of the tachycardia? What is the lev...
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A 42-year-old woman was referred for radiofrequency catheter ablation of narrow QRS tachycardia that was terminated with intravenous adenosine. Baseline twelve-lead ECG was normal during sinus rhythm and transthoracic echocardiography demonstrated no evidence of structural heart disease. The electrophysiological study showed a normal AH interval of 114 ms and HV interval of 37 ms during sinus r...
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In patients with latent dual atrioventricular nodal pathways a 2:1 ventriculoatrial block often occurs during ventricular pacing and is generally associated with the concomitant appearance of QRS alternans. This type of QRS alternans is related to retrograde conduction, and a concealed retrograde conduction in the His Purkinje system could explain the QRS alternans. A case that confirms the hyp...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1987
ISSN: 0735-1097
DOI: 10.1016/s0735-1097(87)80040-2