Postprandial changes of renal blood flow

Abstract

Postprandial renal blood flow was studied in 14 conscious dogs on a chronic high and low sodium intake on 72 days after implantation of an electromagnetic flow transducer around the left renal artery. Fasting renal blood flow was 11.7±3.2 ml/min·kg on high sodium intake (43 days) and 11.5±3.3 ml/min·kg on low sodium intake (29 days). During ingestion no change of renal blood flow occurred; mean arterial pressure rose transiently. During digestion renal blood flow increased always and was, like the fasting renal blood flow, independent of the daily sodium intake: maximum increase of renal blood flow of dogs on a high sodium intake was 41±23%, and of dogs on a low sodium intake 35±155 referring to fasting controls; peak increase mostly occurred between 60 and 90 min postprandially and was due to a decrease of renal vascular resistance.