Document Detail

Halothane alters the oxygen consumption-oxygen delivery relationship compared with conscious state.
MedLine Citation:
PMID:  2248396     Owner:  NLM     Status:  MEDLINE    
The authors' objectives were as follows: 1) to characterize for the first time the relationship between whole body O2 delivery (DO2) and O2 consumption (VO2) in adult conscious dogs; and 2) to asses the effects of the inhalational anesthetic, halothane, on that relationship. DO2 was varied over a wide range in chronically instrumented dogs by gradual inflation and deflation of a hydraulic occluder implanted around the thoracic inferior vena cava to alter venous return and cardiac output. VO2 was measured at different values of DO2 in dogs in the fully conscious state and again during halothane anesthesia. A "binning" technique indicated that halothane decreased VO2 (P less than 0.01) at any given value of DO2 over a broad range of VO2. A two-line piecewise linear regression analysis technique indicated that halothane decreased (P less than 0.01) the critical O2 delivery (COD) from 20 +/- 3 to 10 +/- 1 and increased (P less than 0.01) O2 extraction at COD from 31 +/- 3 to 40 +/- 2%. However, the DO2-VO2 plots measured in both conscious and halothane-anesthetized dogs did not exhibit a discrete discontinuity but rather were closely fit (correlation coefficient = 0.98) by an exponential equation of the following form: O2 extraction = B1.(1 - exp (-DO2/B2))/DO2, where B1 is the delivery-independent estimate of VO2 and B2 is the "delivery constant," i.e., the DO2 associated with a VO2 equal to 63% of B1. Halothane decreased B1 (P less than 0.01) from 5.3 +/- 0.1 to 3.9 +/- 0.1 and decreased B2 (P less than 0.01) from 5.6 +/- 0.3 to 3.6 +/- 0.3 compared with that measured in conscious dogs. Thus, compared with the conscious state, halothane anesthesia alters the fundamental relationship between DO2 and VO2 and may have a beneficial effect on tissue oxygenation at low values of DO2.
P Rock; C Beattie; A W Kimball; D P Nyhan; B B Chen; D M Fehr; S A Derrer; S D Parker; P A Murray
Related Documents :
3021776 - Hyperbaric oxygen reduces edema and necrosis of skeletal muscle in compartment syndrome...
21297616 - Fluorescent peptides highlight peripheral nerves during surgery in mice.
24178926 - Mitochondrial-related proteomic changes during obesity and fasting in mice are greater ...
14713126 - Hypoxic regulation of blood flow in humans. alpha-adrenergic receptors and functional s...
23561916 - Effects of combined application of muscle relaxants and celecoxib administration after ...
25262016 - Ultrasound of the peripheral nerves in systemic vasculitic neuropathies.
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Anesthesiology     Volume:  73     ISSN:  0003-3022     ISO Abbreviation:  Anesthesiology     Publication Date:  1990 Dec 
Date Detail:
Created Date:  1991-01-09     Completed Date:  1991-01-09     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  1300217     Medline TA:  Anesthesiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1186-97     Citation Subset:  AIM; IM    
Johns Hopkins Medical Institutions, Baltimore, Maryland 21205.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Consciousness / physiology*
Halothane / pharmacology*
Oxygen / blood*
Oxygen Consumption / drug effects*
Grant Support
Reg. No./Substance:
151-67-7/Halothane; 7782-44-7/Oxygen

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

Previous Document:  Subarachnoid clonidine reduces spinal cord blood flow and glucose utilization in conscious rats.
Next Document:  Covalent binding of oxidative biotransformation intermediates is associated with halothane hepatotox...