Document Detail

Effects of phenylephrine on cardiac output and venous return depend on the position of the heart on the Frank-Starling relationship.
MedLine Citation:
PMID:  22556399     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: phenylephrine is used daily during anesthesia for treating hypotension. However, the effects of phenylephrine on cardiac output (CO) are not clear. We hypothesized that the impact of phenylephrine on cardiac output is related to preload dependency.
METHODS: eight pigs were studied at a preload independent stage (after CO augmentation) and at a preload dependent stage (after a 21 ml/kg hemorrhage). At each stage, phenylephrine boluses (0.5, 1.0, 2.0, and 4.0 μg/kg) were given randomly while mean arterial pressure (MAP), CO, inferior vena cava flow (IVCf) (both measured using ultrasonic flow probes), and pulse pressure variation were measured.
RESULTS: at the preload independent stage, phenylephrine boluses induced significant increases in MAP (from 72 ± 6 to 100 ± 6 mmHg; P < 0.05) and decreases in CO and IVCf (from 7.0 ± 0.8 to 6.0 ± 1.1 l/min and from 4.6 ± 0.5 to 3.8 ± 0.6 l/min, respectively). At the preload-dependent stage, phenylephrine boluses induced significant increases in MAP (from 40 ± 7 to 65 ± 9 mmHg), CO (from 4.1 ± 0.6 to 4.9 ± 0.7 l/min), and IVCf (from 3.0 ± 0.4 to 3.5 ± 0.6 l/min; all data presented are for 4 μg/kg). Incremental doses of phenylephrine induced incremental changes in cardiac output. A pulse pressure variation >16.4% before phenylephrine predicted an increase in stroke volume with a 93% sensitivity and a 100% specificity.
CONCLUSION: impact of phenylephrine on cardiac output is related to preload dependency. When the heart is preload independent, phenylephrine boluses induce on average a decrease in cardiac output. When the heart is preload dependent, phenylephrine boluses induce on average an increase in cardiac output.
Maxime Cannesson; Zhongping Jian; Guo Chen; Trung Q Vu; Feras Hatib
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Publication Detail:
Type:  Journal Article     Date:  2012-05-03
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  113     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-07-20     Completed Date:  2012-12-18     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  281-9     Citation Subset:  IM    
Department of Anesthesiology and Perioperative Care, School of Medicine, University of California-Irvine, 333 City Boulevard West Side, Orange, CA 92868-3301, USA.
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MeSH Terms
Cardiac Output / drug effects*,  physiology*
Cardiotonic Agents
Dose-Response Relationship, Drug
Phenylephrine / administration & dosage*
Posture / physiology*
Stroke Volume / drug effects*,  physiology*
Veins / drug effects,  physiology*
Reg. No./Substance:
0/Cardiotonic Agents; 59-42-7/Phenylephrine
Comment In:
J Appl Physiol (1985). 2012 Sep;113(6):984   [PMID:  22984238 ]
J Appl Physiol (1985). 2013 Jun;114(11):1646   [PMID:  23729635 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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