P089 RELATION BETWEEN ISOMETRIC STRESS-INDUCED PRESSURE RESPONSE AND P-WAVE OF THE ELECTROCARDIOGRAM

Background and objectives: The effects of isometric stress-induced vascular hyperreactivity on P wave duration have scarcely been studied. We set out to determine the relationship between isometric stress reactivity and the P wave in young hypertensives. Materials: A cross-sectional, prospective study was carried out on the relationship between the duration of the maximum P wave corrected for heart rate (Pmaxc) and the degree of blood pressure reactivity in two groups of 30 young men, who were divided into normotensive and hypertensive patients. The hypertensive patients were of recent clinical diagnosis. Vascular reactivity was measured by the sustained weight test (PPS). Results: Diastolic blood pressure variation (ΔPAD) was greater in hypertensives than in normotensives (15.83 mmHg ± 7.321 vs. 10.17 mmHg ± 5.331, p<0.01) after application of the PPS. The ΔPAD correlated positively with Pmaxc in both groups studied, but was only significant in the hypertensive group (r=0.433; p<0.05). Conclusions: Increasing levels of isometric stress induced by PPS correlate positively and significantly with Pmaxc. Figure 1: Correlation between diastolic blood pressure reactivity (ΔPAD) and heart rate correction for peak P wave (Pmaxc) in hypertensives and normotensives