Asymmetric features of short-term blood pressure variability.
Summary of "Asymmetric features of short-term blood pressure variability."
Prolongations of cardiac cycles have a significantly larger contribution to short-term heart rate variability than shortenings-this is called heart rate asymmetry. Our aim is to establish the existence of blood pressure asymmetry phenomenon, which has not been done so far. We used 30-min resting continuous recordings of finger pressure waveforms from 227 healthy young volunteers (19-31 years old; 97 female), and performed Poincaré plot analysis of systolic blood pressure (SBP) to quantify the effect. Median contribution of SBP increases (C(i)) to short-term blood pressure variability was 52.8% (inter-quartile range: 50.9-55.1%) and median number of SBP increases (N(i)) was 48.8% (inter-quartile range: 47.2-50.1%). The C(i)>50% was found in 82% (P<0.0001; binomial test) and N(i)<50% in 75% (P<0.0001) of the subjects. Although SBP increases are significantly less abundant than reductions, their contribution to short-term blood pressure variability is significantly larger, which means that short-term blood pressure variability is asymmetric. SBP increases and reductions have unequal contribution to short-term blood pressure variability at supine rest in young healthy people. As this asymmetric behavior of blood pressure variability is present in most of the healthy studied people at rest, it can be concluded that blood pressure asymmetry is a physiological phenomenon.Hypertension Research advance online publication, 5 August 2010; doi:10.1038/hr.2010.138.
Department of Cardiology-Intensive Therapy, University of Medical Sciences in Poznan, Poznan, Poland.
This article was published in the following journal.
Name: Hypertension research : official journal of the Japanese Society of Hypertension
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20686487
- DOI: http://dx.doi.org/10.1038/hr.2010.138
Medical and Biotech [MESH] Definitions
Blood Pressure Monitoring, Ambulatory
Method in which repeated blood pressure readings are made while the patient undergoes normal daily activities. It allows quantitative analysis of the high blood pressure load over time, can help distinguish between types of HYPERTENSION, and can assess the effectiveness of antihypertensive therapy.
Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.
A response by the BARORECEPTORS to increased BLOOD PRESSURE. Increased pressure stretches BLOOD VESSELS which activates the baroreceptors in the vessel walls. The net response of the CENTRAL NERVOUS SYSTEM is a reduction of central sympathetic outflow. This reduces blood pressure both by decreasing peripheral VASCULAR RESISTANCE and by lowering CARDIAC OUTPUT. Because the baroreceptors are tonically active, the baroreflex can compensate rapidly for both increases and decreases in blood pressure.
The blood pressure in the VEINS. It is usually measured to assess the filling PRESSURE to the HEART VENTRICLE.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
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