Key Points
- The study aims to explore the relationship between muscle nerve sympathetic activity and blood pressure in hypertensive and normotensive subjects.
- Analyzed multi-unit sympathetic activity in 33 healthy and 12 hypertensive subjects at rest.
- Recorded intra-arterial blood pressure in 17 normotensive and all hypertensive subjects.
- Quantified sympathetic activity through burst incidence in relation to age and blood pressure levels.
- Mean burst incidence varied significantly among subjects, with hypertensives showing reset diastolic pressure thresholds for sympathetic outflow.
- Diastolic fluctuations influenced sympathetic burst occurrence, more in hypertensive subjects.
- At stable diastolic pressure, sympathetic activity increased during diastolic pressure declines, especially in hypertensive individuals.
Structured PICO
PPopulation33 healthy (normotensive) and 12 hypertensive subjects resting in the recumbent position (total n=45).
OOutcomeMuscle nerve sympathetic activity (burst incidence) and its correlation with age and arterial blood pressuresurrogate
The diastolic pressure threshold for sympathetic outflow is reset to higher values with greater variability in hypertensive subjects, likely as a secondary effect of hypertension.