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Effect of length changes on sensitivity of helical artery strips to adenosine.

The relationship between length and the responses of helical strips of rabbit femoral and coronary arteries to vasoactive agents was investigated by conducting concentration--response determinations at the length for maximum active force (Lmax) and a shorter length. The mean effective dose (ED50) values for norepinephrine (NE) were smaller when femoral artery strips were set at Lmax, in comparison to the values at the shorter length. Maximal relaxation of femoral artery strips by adenosine was greater when the strips were set at Lmax. However, adenosine ED50 values were smaller at Lmax only in groups of strips in which responses at Lmax were obtained prior to those at the shorter length. Experiments with coronary artery strips did not demonstrate consistent relationships between strip length and ED50 values for acetylcholine (ACh) or adenosine. The results of experiments with artery strips from normotensive and those from one-kidney, one-clip hypertensive rabbits were similar. Thus, the femoral artery data indicate that helical artery strip preparations may exhibit length-dependent sensitivity to a vasodilator agent as well as vasoconstrictor agents under certain experimental conditions. However, the coronary artery data suggest that length may not affect sensitivity of isolated artery preparations from all vascular beds in the same manner.