Regional blood flow response to orthostasis in patients with congestive heart failure

Steven Goldsmith, Gary S Francis, T. Barry Levine, Jay N Cohn

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To investigate the central and regional circulatory response to orthostasis in congestive heart failure, hemodynamic variables and forearm and hepatic blood flow were measured in 22 patients at supine rest and during a 65° head-up tilt. Results were compared with those in nine normal subjects. Heart rate and mean arterial blood pressure increased during tilt in normal subjects, but not in patients with heart failure. Forearm blood flow decreased in normal subjects from 3.7 ± l.lto2.7± 1.5 ml/min per 100 g (probability [p] < 0.02), but did not change from a lower baseline (1.65 ± 0.78 ml/min per 100 g) in patients. Forearm vascular resistance increased in normal subjects but not in patients. Hepatic blood flow did not change during tilt in either group, but hepatic vascular resistance increased in normal subjects from 0.37 ± 0.13 to 0.47 ± 0.15 U, (p < 0.02). The increase was not seen in patients (1.2 ± 1.1 to 1.4 ± 1.0 U, p = not significant [NS]). Total systemic resistance increased in patients from 1,848 ± 560 to 2,132 ± 731 dynes·s·cm-5 (p < 0.005) indicating that resistance did increase in some vascular beds. Plasma nor-epinephrine also increased modestly in these patients from 665 ± 377 to 761 ± 379 pg/ml (p = 0.035), but individual changes in plasma norepinephrine did not correlate with changes in hepatic or forearm resistance. Thus, both the overall hemodynamic response and the regulation of regional blood flow and resistance differ in several respects in patients with congestive heart failure when compared with normal subjects. Changes in heart rate, blood pressure, forearm flow and forearm and hepatic vascular resistance are all blunted in patients. Reasons for the differences are not yet clear, but may be associated with abnormalities in reflex control of the circulation in patients with congestive heart failure.

Original languageEnglish (US)
Pages (from-to)1391-1395
Number of pages5
JournalJournal of the American College of Cardiology
Issue number6
StatePublished - 1983

Bibliographical note

Funding Information:
From the Cardiovascular Division, Uruversuy of Minnesota School of Medicine, and the Veterans AdministratIon Medical Center, Minneapolis, Minnesota. This research was supported in part by Trainmg Grant HL07l84-06 and Research Grant HL22977-03 from the National Heart, Lung, and Blood Institute, NatIonal Institutes of Health, Bethesda, Maryland and by a Research Grant from the Veterans Administration, Washington, D.C Dr. Goldsmith is the recipient of a Clinical Investigator Award from the National Heart, Lung, and Blood Institute. Manuscript received October 5, 1982; revised manuscript received January 24, 1983. accepted January 25, 1983.


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