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Cardiac Output Response to Norepinephrine in Postoperative Cardiac Surgery Patients: Interpretation With Venous Return and Cardiac Function Curves.
MedLine Citation:
PMID:  23128382     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE:: We studied the variable effects of norepinephrine infusion on cardiac output in postoperative cardiac surgical patients in whom norepinephrine increased mean arterial pressure. We hypothesized that the directional change in cardiac output would be determined by baseline cardiac function, as quantified by stroke volume variation, and the subsequent changes in mean systemic filling pressure and vasomotor tone. DESIGN:: Intervention study. SETTING:: ICU of a university hospital. PATIENTS:: Sixteen mechanically ventilated postoperative cardiac surgery patients. INTERVENTIONS:: Inspiratory holds were performed at baseline-1, during increased norepinephrine infusion, and baseline-2 conditions. MEASUREMENTS AND MAIN RESULTS:: We measured mean arterial pressure, heart rate, central venous pressure, cardiac output, stroke volume variation and, with use of inspiratory hold maneuvers, mean systemic filling pressure, then calculated resistance for venous return and systemic vascular resistance. Increasing norepinephrine by 0.04 ± 0.02 μg·kg·min increased mean arterial pressure 20 mm Hg in all patients. Cardiac output decreased in ten and increased in six patients. In all patients mean systemic filling pressure, systemic vascular resistance and resistance for venous return increased and stroke volume variation decreased. Resistance for venous return and systemic vascular resistance increased more (p = 0.019 and p = 0.002) in the patients with a cardiac output decrease. Heart rate decreased in the patients with a cardiac output decrease (p = .002) and was unchanged in the patients with a cardiac output increase. Baseline stroke volume variation was higher in those in whom cardiac output increased (14.4 ± 4.2% vs. 9.1 ± 2.4%, p = 0.012). Stroke volume variation >8.7% predicted the increase in cardiac output to norepinephrine (area under the receiver operating characteristic curve 0.900). CONCLUSIONS:: The change in cardiac output induced by norepinephrine is determined by the balance of volume recruitment (increase in mean systemic filling pressure), change in resistance for venous return, and baseline heart function. Furthermore, the response of cardiac output on norepinephrine can be predicted by baseline stroke volume variation.
Authors:
Jacinta J Maas; Michael R Pinsky; Rob B de Wilde; Evert de Jonge; Jos R Jansen
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-2
Journal Detail:
Title:  Critical care medicine     Volume:  -     ISSN:  1530-0293     ISO Abbreviation:  Crit. Care Med.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0355501     Medline TA:  Crit Care Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 Department of Intensive Care Medicine, Leiden University Medical Center, Leiden, The Netherlands. 2 Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, PA.
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