Key result
Congestive heart failure is linked to a prolonged relative Q-T interval versus normal controls.
Cross-Sectional (n=454)
No
Mean Difference: 0.058
Absolute Event Rate: 0.432% vs 0.374%
This study documents the variation of the Q-T and R-R intervals in a normal male over a 24-hour period.
Single ECGs may miss normal diurnal QT/RR shifts; leaves open need for timed reference standards in repolarization research.
Electrocardiographic measurements of a normal individual, (male), during a 24-hour period Time "~~~~'R-R " "Q0-T"v Time interval interval K It seconds seconds 9:30 a.m.0.925 0.350 0.364 10:30 a.m.0.900 0.358 0.377 11:30 a.m.0
No takes yet. Share an insight, caveat, or question.
Cheer et al. (1931) conducted a cross-sectional in Congestive heart failure (n=454). Congestive heart failure vs. Normal individuals without heart failure was evaluated on Constant K (Q-T interval divided by the square root of the R-R interval) (Mean difference 0.058). Congestive heart failure was associated with a significantly prolonged relative Q-T interval, with the constant K increased by 0.058 in males and 0.045 in females compared to normal controls.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: