Key result
Isolated canine skeletal muscle demonstrates distinct tone-dependent arteriolar and tone-independent venous zero-flow pressures.
Why the study?
The existence of two positive zero-flow pressure intercepts, one tone-dependent and one tone-independent, in autoregulating isolated skeletal muscle was investigated to clarify vascular regulation mechanisms.
Population
Isolated canine extensor digitorum longus muscle preparation perfused with autologous blood
Comparison
Variation of venous pressure (0-45 mmHg) and administration of vasoactive drugs
Design
Preclinical experimental study with isolated muscle preparation
Authors
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Demonstrates dual zero-flow intercepts in isolated muscle; leaves open in vivo relevance and clinical translation.
The study demonstrates the existence of a proximal tone-dependent zero-flow pressure at the arteriolar level and a distal tone-independent zero-flow pressure at the venous level in skeletal muscle.
Braakman et al. (1990) studied Autoregulating isolated skeletal muscle. Venous pressure variation and vasoactive drugs was evaluated on Steady-state and instantaneous zero-flow pressure axis intercepts. In isolated canine skeletal muscle, there is a proximal tone-dependent zero-flow pressure at the arteriolar level (mean 28.5 mmHg) and a distal tone-independent zero-flow pressure at the venous level (mean 8.9 mmHg).
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