The heart rate response to the Valsalva manoeuvre was reproducible in normal subjects, with a within-subject variation of 0.044 for the tachycardia ratio and 0.18 for the Valsalva ratio.
Observational (n=19)
Is the heart rate response to the Valsalva manoeuvre reproducible in normal subjects?
The heart rate response to the Valsalva manoeuvre, measured by tachycardia and Valsalva ratios, demonstrates reproducible within-subject variation in normal subjects.
The reproducibility of the heart rate response to the Valsalva manoeuvre was assessed in 12 young normal subjects who each repeated the manoeuvre 10 times. The length of the RR intervals before, during, and after each Valsalva manoeuvre was measuredfrom an electrocardiogram and the changes expressed as two ratios: the 'tachycardia' ratio and the 'Valsalva' ratio. The within-subject variation was 0 044 for the tachycardia ratio and + 0<18for the Valsalva ratio, while the between-subject variation was 0 10for the tachycardia ratio and 0-37for the Valsalva ratio. The heart rate response to the Valsalva manoeuvre was alsofound to be reproducible in 7 older normal subjects.
Baldwa et al. (Wed,) conducted a observational in Healthy subjects (n=19). Valsalva manoeuvre was evaluated on Reproducibility of heart rate response (tachycardia ratio and Valsalva ratio). The heart rate response to the Valsalva manoeuvre was reproducible in normal subjects, with a within-subject variation of 0.044 for the tachycardia ratio and 0.18 for the Valsalva ratio.