COMPARISON OF 2 METHODS OF MEASURING TRACHEAL MUCOUS VELOCITY IN ANESTHETIZED BEAGLE DOGS

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Abstract
Tracheal mucous velocity measurements were made in 6 beagle dogs using Sackner''s method of radiographing teflon discs and Chopra''s method using a .gamma. camera to detect the movement of instilled labeled material. Dogs were anesthetized by i.v. injection of 30 mg Na pentobarbital/kg body wt in case 1 after pretreatment with atropine and Innovar-Vet; in case 2, without the pretreatment. The mean velocities measured using the 2 techniques were significantly different in both cases: case 1, 3.7 .+-. 3.3 mm/min for Sackner''s method and 7.5 .+-. 3.7 mm/min for Chopra''s method (P < 0.001); case 2, 3.7 .+-. 3.1 mm/min for Sackner''s method and 5.5 .+-. 2.1 mm/min for Chopra''s method (P < 0.05). Systematic differences in velocities should be considered when comparing data from different techniques.