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Electroencephalograms of 20 dogs given succinylcholine and concurrent artificial respiration were recorded. The amplitudes of the fast activity of the electroencephalograms were approximately one-fifth that observed in awake dogs. In addition, the occurrence of slow waves (6 to 8 Hz) was more marked in those dogs treated with succinylcholine. Succinylcholine caused a low amplitude dominant activity with increased moderate amplitude low frequency waves.

Electroencephalograms were recorded from 10 dogs before, immediately after, and every 10 minutes (for 60 minutes) after IV injection of 0.005 ml of a fentanyl citrate and droperidol combination/kg of body weight. Narcosis was adequate for recording. At 30 to 40 minutes after injection, tail wagging was the only adverse reaction (EEG artifact) observed. The only changes in EEG activity observed were a slight increase in amplitude of the dominant activity and an increase in spindle-like activity. Daily repetition for 5 days did not alter the EEG pattern or the behavior of the dogs.

The voltage and duration of electrical rectangular pulsed stimuli needed to produce an F wave and a monosynaptic reflex (H wave) and the characteristics of these responses were recorded in clinically normal dogs. Optimal stimulus to produce H waves was 0.1 to 0.2 ms and less than 80 volts. F waves were variable in appearance and were most evident following 0.5 ms and 125 to 150 volt stimulation. F waves had shorter latency than comparable H waves.

A new fascial technique was used to repair artificially induced rupture of the cranial cruciate ligament in 20 dogs. Although technically simple to perform, the procedure resulted in only 12 animals free of lameness. In addition, a drawer sign was present in the stifle of 14 animals 31 days after surgery. Arthritis changes typical of cruciate ligament instability were observed in 16 joints; changes were slight to moderate in 10 joints.