THE EFFECT OF HEXAMETHONIUM AS COMPARED TO PROCAINE OR METYCAINE LUMBAR BLOCK ON THE BLOOD FLOW TO THE FOOT OF NORMAL SUBJECTS 12

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Abstract

Blood flow was measured in the left foot using the venous occlusion plethysmograph described by Abramson (10), but with certain modifications. These changes were introduced because of the necessity of removing the foot from the plethysmograph at the time of the regional block and then replacing it rapidly to avoid delaying the determinations of blood flow. Therefore, instead of cementing the edge of a thick rubber sheeting to the ankle, a thin rubber boot was prepared, the edges of which were everted and sealed permanently to the inlet of the plethysmograph in a manner similar to that described by Krogh, Landis and Turner (11) for use with the limb segment plethysmograph. The boot was made of rubber thin and pliable enough for the pressure of the water filling the plethysmograph to press the rubber membrane snugly against the contours of the foot.4 Since an air pocket usually formed at the upper end of the boot, the air was removed by means of small-bore plastic tubing leading from the toe of the boot to one of the two outlets of the plethysmograph. The trapped air could then be removed by applying suction to the plastic tube with a syringe. By means of this device, the foot could be sealed quickly

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