Cardiac contractility, central haemodynamics and blood pressure regulation during semistarvation
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Cardiac contractility, central haemodynamics and blood pressure regulation during semistarvation. / Stokholm, K H; Breum, Leif; Astrup, Arne.
I: Clinical Physiology, Bind 11, Nr. 6, 1991, s. 513-523.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Cardiac contractility, central haemodynamics and blood pressure regulation during semistarvation
AU - Stokholm, K H
AU - Breum, Leif
AU - Astrup, Arne
PY - 1991
Y1 - 1991
N2 - Eight obese patients were studied before and after 2 weeks of treatment by a very‐low‐calorie diet (VLCD). Cardiac output and central blood volume (pulmonary blood volume and left atrial volume) were determined by indicator dilution (125I‐albumin) and radionuclide angiocardiography (first pass and equilibrium technique by [99Tcm]red blood cells). Cardiac output decreased concomitantly with the reduction in oxygen uptake as the calculated systemic arteriovenous difference of oxygen was unaltered. There were no significant decreases in left ventricular contractility indices, i.e. the ejection fraction, the peak ejection rate and changes in end‐systolic volume. Also the diastolic function evaluated by the peak filling rate remained normal. Furthermore, no sign of backward failure could be demonstrated since the central blood volume was not significantly increased. Both systolic and diastolic blood pressure (BP) declined. The fall in BP was caused by the reduction in cardiac output as the total peripheral resistance was unchanged. Finally, the decline in total blood volume was not significant. These findings together with a reduction in heart rate indicated that a reduced sympathetic tone via increased capacitance of the venous bed was the main operator of a reduced venous return. Thus, the haemodynamic alterations in obese patients during short‐term semistarvation may be caused by the fall in oxygen uptake and produced mainly by changes in the sympathetic tone.
AB - Eight obese patients were studied before and after 2 weeks of treatment by a very‐low‐calorie diet (VLCD). Cardiac output and central blood volume (pulmonary blood volume and left atrial volume) were determined by indicator dilution (125I‐albumin) and radionuclide angiocardiography (first pass and equilibrium technique by [99Tcm]red blood cells). Cardiac output decreased concomitantly with the reduction in oxygen uptake as the calculated systemic arteriovenous difference of oxygen was unaltered. There were no significant decreases in left ventricular contractility indices, i.e. the ejection fraction, the peak ejection rate and changes in end‐systolic volume. Also the diastolic function evaluated by the peak filling rate remained normal. Furthermore, no sign of backward failure could be demonstrated since the central blood volume was not significantly increased. Both systolic and diastolic blood pressure (BP) declined. The fall in BP was caused by the reduction in cardiac output as the total peripheral resistance was unchanged. Finally, the decline in total blood volume was not significant. These findings together with a reduction in heart rate indicated that a reduced sympathetic tone via increased capacitance of the venous bed was the main operator of a reduced venous return. Thus, the haemodynamic alterations in obese patients during short‐term semistarvation may be caused by the fall in oxygen uptake and produced mainly by changes in the sympathetic tone.
KW - Blood pressure
KW - Cardiac output
KW - Energy metabolism
KW - Myocardial contraction
KW - Obesity
KW - Very‐low‐calorie diet
U2 - 10.1111/j.1475-097X.1991.tb00671.x
DO - 10.1111/j.1475-097X.1991.tb00671.x
M3 - Journal article
C2 - 1769186
AN - SCOPUS:0025953522
VL - 11
SP - 513
EP - 523
JO - Clinical Physiology
JF - Clinical Physiology
SN - 0144-5979
IS - 6
ER -
ID: 212164939