Hemorrhage induces a detectable compensatory vasoconstrictor tone in the hindquarter vascular region of spontaneously hypertensive rats, despite pre-existing abnormal vasoconstrictor tone.
Suggests persistent compensatory sympathetic tone in hemorrhaged hypertensive models; leaves open translation to human shock management.
We investigated whether a compensatory vasoconstrictor action would be induced by a hypotensive intervention in the hindquarter vascular region of conscious spontaneously hypertensive rats (SHRs). Mean arterial pressure and hindquarter blood flow were recorded. After hemorrhage (withdrawing blood, 0.3 ml/100 g body weight), hindquarter resistance (HQR) was increased significantly. The decrease in HQR induced by the administration of a ganglionic blocker (C6; 25 mg/kg, i.v.) was significantly greater in SHRs with hemorrhage than in those without hemorrhage. The present results suggest that a detectable hindquarter compensator tone occurs due to hemorrhage in SHRs, although an abnormal substantial vasoconstrictor tone already exists in the hindquarters.
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Teranishi et al. (2001) studied this question.
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