Different
Characteristics of T Wave Alternans Between Polymorphic Ventricular
Tachycardia and Monomorphic Ventricular Tachycardia |
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Presentation
Time: Monday,
10:00 a.m. - 11:00 a.m. |
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Kaoru
Tanno, Youichi
Kobayashi, Takashi Katagiri, Showa University, Tokyo, Japan. |
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Presentation
Number: 1093-109 |
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Poster
Board Number: 109 |
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Keyword:
Ventricular
tachycardia, Repolarization |
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[Background]
Microvolt T wave alternans (TWA) has been reported to be closely associated
with polymorphic ventricular tachycardia (VT) in animal experiments. However,
it is not clear whether monomorphic VT (monoVT) has relation to TWA as
closely as polymorphic VT (polyVT). [Method] The subjects were 59 patients
(male/female=51/8, mean age 60 ± 13 years) with organic heart disease and
ventricular tachyarrhythmias. We compared TWA of patients with polyVT with
that of patients with monoVT. Programmed ventricular stimulation was
performed at right ventricular apex and outflow tract to induce sustained
ventricular tachyarrhythmias. Recordings of TWA were made in sinus rhythm and
with atrial pacing at 80, 90, 100, and 110 beat per minute if conducted
without atrioventricular block for 3 minutes respectively with CH2000 system
(Cambridge Heart Co. Boston, MA). TWA was considered positive when the alternans
voltage (Valt) was >1.9mV and the alternans ratio was
>3 for a period of more than 1 minute in VM, X, Y, Z, or two adjacent
precordial leads. |
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