Why the study?
Does the shorthand rule (QT < 1/2 of the RR interval) accurately predict a normal QTc compared to standard correction formulas?
Does the shorthand rule (QT < 1/2 of the RR interval) accurately predict a normal QTc compared to standard correction formulas?
This study mathematically tests the validity of the commonly taught shorthand rule that QTc is normal if QT is less than half the RR interval.
No takes yet. Share an insight, caveat, or question.
Shorthand QTc rule warrants clinical caution; leaves open its validity versus standard formulas in broader cohorts.
Colin K. L. Phoon (1998) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: