Heart rate response to Valsalva manoeuvre. Reproducibility in normals, and relation to variation in resting heart rate in diabetics.
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TL;DR
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 and was found to be reproducible in 7 older normal subjects.
Abstract
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.