Accession Number : ADA614688


Title :   Arterial Blood Gases, Electrolytes and Metabolic Indices Associated with Hemorrhagic Shock: Inter-and Intrainbred Rat Strain Variation


Descriptive Note : Journal article


Corporate Author : ARMY INST OF SURGICAL RESEARCH FORT SAM HOUSTON TX


Personal Author(s) : Rose, Rajiv ; Kheirabadi, Bijan S ; Klemcke, Harold G


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a614688.pdf


Report Date : 07 Mar 2013


Pagination or Media Count : 10


Abstract : We have previously shown interstrain variation (indicating a genetic basis), and intrastrain variation in survival time after hemorrhage (STaH) among inbred rat strains. To assist in understanding physiological mechanisms associated with STaH, we analyzed various arterial blood measures (ABM; pH, PaCO2, oxygen content, sodium, potassium, glucose, bicarbonate, base excess, total CO2, and ionized calcium) in inbred rats. Rats from five inbred strains (n = 8-10/strain) were catheterized and, 24 h later, subjected to a conscious, controlled, 47% hemorrhage. ABM were measured at the start (initial) and end (final) of hemorrhage. Inter- and intrainbred strain variations of ABM were quantified and compared, and correlations of ABM with STaH were determined. All final ABM values and some initial ABM values were different among strains. Most ABM changed (delta) during hemorrhage, and these changes differed among strains (P 0.03). Some strain-dependent correlations (r /=0.7; P /=0.05) existed between deltaABM and STaH (e.g., BN/Mcwi, deltaK(expn +), r =-0.84). Dark Agouti rats (longest STaH) had the smallest deltaPaCO2, deltaHCO3-, and deltabase excess, and the highest final glucose. High coefficients of variation (CVs, 10%), strain-specific CVs, and low intraclass correlation coefficients (r[sub t] 0.5) defined the large intrastrain ABM variation that exceeded interstrain variation for most ABM. These results suggest that some ABM (K[expn +), PaCO2, glucose, oxygen content) could predict subsequent STaH in an inbred rat strain-dependent manner. We speculate that whereas genetic differences may be responsible for interstrain variation, individual-specific epigenetic processes (e.g., DNA methylation) may be partly responsible for both inter- and intrastrain ABM variation.


Descriptors :   *BLOOD GASES , *ELECTROLYTES , ARTERIES , BLOOD CHEMISTRY , BREEDING , COEFFICIENTS , CORRELATION , HEMORRHAGE , HEMORRHAGIC SHOCK , METABOLISM , OXYGEN , RATS , STRAINS(BIOLOGY) , VARIATIONS


Subject Categories : Anatomy and Physiology
      Medicine and Medical Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE