Circadian hemodynamic characteristics in hypertensive patients with primary aldosteronism.

ABSTRACT

OBJECTIVE: The present study aimed to compare circadian hemodynamic characteristics in hypertensive patients with and without primary aldosteronism. METHODS: Circadian hemodynamics, including 24-h brachial and central blood pressure (BP), SBP variability indices, central pulse wave velocity (PWV), augmentation index (AIx@75), cardiac index, and total vascular resistance (TVR), were evaluated using an oscillometric device, Mobil-O-Graph, in 60 patients with primary aldosteronism (63.4±13.3 years, 47% women) and 120 age-matched and sex-matched patients with essential hypertension. RESULTS: Office SBP, PWV, AIx@75, and BP variability indices were similar between groups; however, 24-h brachial (124 ±â€Š14 vs 130 ±â€Š11 mmHg) as well as central (112 ±â€Š12 vs 120 ±â€Š10 mmHg) SBP was higher (both P < 0.01), and the difference between 24-h brachial and central SBP (11 ±â€Š5 vs 9 ±â€Š3 mmHg, P < 0.05), an index of pressure amplification, was smaller in primary aldosteronism than in essential hypertension. In both groups, cardiac index decreased from daytime to night-time (both P < 0.01), but this decrease was smaller in primary aldosteronism (P < 0.05). During daytime, TVR in primary aldosteronism was higher than that in essential hypertension (P < 0.05), and the significant increase of TVR from daytime to night-time was lost in primary aldosteronism. In a multivariate stepwise regression model, primary aldosteronism emerged as an independent predictor of 24-h central SBP as well as the difference between 24-h brachial and central SBP. CONCLUSION: Our results demonstrated that circadian hemodynamics in primary aldosteronism patients are characterized by increased central SBP, smaller disparity between brachial and central SBP, and disturbed circadian hemodynamic variation.