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Provocation of T-wave alternans with adenosine. Adenosine test in an asymptomatic patient is considered to be an ‘obligatory carrier’ of LQTS because her mother and daughter have obvious LQTS with documented torsade de pointes (her daughter has been reported elsewhere).32 The QTc at baseline is borderline for a female (QTc = 450 ms). During the tachycardia phase of the adenosine challenge, she develops T-wave alternans (arrows).
