[Impaired urinary flow rate during the day: a new factor possibly involved in hypertension and in the lack of nocturnal dipping].

Abstract

This study shows the advantages of separate day and night urine collections in relation with AMBP. For a similar total diuresis, some subjects exhibit a too low urine flow rate and too low NaEx during the day, and a compensatory rise during the night. This low diurnal diuresis is associated with a higher blood pressure and a lower nocturnal fall (= nocturnal pressure diuresis). The factors responsible for a too low diuresis during the day need further investigation.