Key result
4-minute recovery QTc strongly predicts LQTS carrier status, yielding a 0.90 AUC in females.
Why the study?
Diagnosis of congenital LQTS is complicated by phenotypic ambiguity, with a frequent normal-to-borderline resting QT interval. This study evaluated a 3-step exercise algorithm in a broader LQTS population with milder phenotypes to establish sex-specific cutoffs.
Does a 3-step QT exercise algorithm using treadmill testing accurately diagnose and predict subtype in patients with long-QT syndrome?
Case-Control (n=423)
Yes
Does a 3-step QT exercise algorithm using treadmill testing accurately diagnose and predict subtype in patients with long-QT syndrome?
Effect estimate: AUC 0.90 (females), 0.82 (males)
Exercise treadmill testing with sex-specific QTc cutoffs during recovery accurately identifies LQTS carrier status and differentiates between LQTS1 and LQTS2 genotypes, even in patients with normal or borderline resting QTc.
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May aid LQTS carrier detection with normal resting QTc; leaves open prospective validation before clinical adoption.
Yee et al. (2022) conducted a case-control in Congenital long-QT syndrome (LQTS) (n=423). Exercise treadmill testing (3-step QT exercise algorithm) vs. Unaffected controls was evaluated on Predictive value of 4-minute recovery QTc for carrier status (AUC 0.90 (females), 0.82 (males)). The 4-minute recovery QTc during exercise treadmill testing effectively predicted LQTS carrier status, yielding an area under the curve of 0.90 in females and 0.82 in males.
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