Key result
This systematic review evaluates the efficacy and feasibility of exercise tests or postural changes in diagnosing long QT syndrome, with no quantitative results reported in the abstract.
Why the study?
Most evidence for QT prolongation during exercise or postural change in diagnosing LQTS comes from single-center studies without external validation, creating inter-study heterogeneity and diagnostic interpretation difficulties.
Does QT interval measurement during exercise tests or postural changes improve the diagnosis of congenital long QT syndrome?
Systematic Review
Does QT interval measurement during exercise tests or postural changes improve the diagnosis of congenital long QT syndrome?
This systematic review aims to summarize the evidence on the diagnostic performance and feasibility of exercise tests and postural changes for identifying congenital long QT syndrome.
May aid LQTS diagnosis when resting QT is borderline; leaves open standardized protocols and thresholds.
Congenital long QT syndrome (LQTS) causes life-threatening cardiac arrhythmias and is the leading cause of sudden cardiac death in young people. Measurements of QT prolongation during exercise or postural change have been recommended to assist in the diagnosis of LQTS, particularly in those with hidden phenotypes. However, most evidence has come from single-center studies without external validation in an independent cohort. Inter-study heterogeneity leads to significant difficulties in interpreting and applying consistent diagnostic criteria for LQTS. A comprehensive systematic review is critically needed to summarize the evidence and validate the diagnostic performance of QT intervals during exercise or postural change across a variety of studies. In this study, we review cross-sectional and cohort studies evaluating the efficacy and feasibility of exercise tests or postural changes in diagnosing LQTS, and propose possible problems resulting from exercise tests.
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Chan et al. (2022) conducted a systematic review in Congenital long QT syndrome (LQTS). Exercise tests or postural changes was evaluated on Efficacy and feasibility of exercise tests or postural changes in diagnosing LQTS. This systematic review evaluates the efficacy and feasibility of exercise tests or postural changes in diagnosing long QT syndrome, with no quantitative results reported in the abstract.
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