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694 records · Page 39Linked to original sources
PubMed1984

Auditory-evoked response in the clinically normal dog: early latency components.

Early latency components (0 to 10 ms) of the auditory-evoked response, which is also called the brainstem auditory-evoked response (BAER), were recorded in 6 clinically normal adult dogs. Each dog responded to suprathreshold monaural clicks with a highly repeatable averaged waveform configuration consisting of 6 to 7 vertex positive waves. Configuration of the canine BAER consisted mainly of waves I, II, III, V, and VI. Wave IV was present in some records, but in most cases, it formed a complex with wave III and was not apparent as a separate wave. After a 90-dB hearing level (HL) stimulus (20/s), the positive peak of wave I in the averaged response appeared at approximately 1 ms after stimulation onset, and subsequent waves were spaced at approximately less than or equal to 1-ms intervals. Amplitudes of these waves were 4.0 microV when measured from positive peak to the following negative trough. Experiments were conducted to determine the effects of varying stimulus intensity (50- to 90-dB HL) on BAER wave amplitude and peak latency in nonanesthetized and anesthetized dogs and to determine the effects of increasing stimulus rate (10 to 50/s) in nonanesthetized dogs. As stimulus intensity was increased in 10-dB steps from 50 to 90 dB and as the stimulus rate remained at 20/s, amplitude increased and latency decreased for all waves (P less than 0.01). When stimulus intensity was held constant at 90 dB and stimulus rate increased from 5 to 50/s, amplitude decreased and latency increased.(ABSTRACT TRUNCATED AT 250 WORDS)

Acoustic Stimulation↗
PubMed1984

Auditory-evoked response in the clinically normal dog: middle latency components.

The middle latency components (6 to 60 ms) of the auditory-evoked response were recorded in clinically normal mature dogs (n = 15 mixed breed). To record the middle latency response (MLR), a series of suprathreshold auditory clicks was presented monaurally to nonanesthetized and anesthetized dogs at a stimulus rate of 5/s. To determine effects of stimulus intensity on wave amplitude and latency in nonanesthetized dogs, clicks were presented at 90-, 70-, and 50-dB hearing level. Filtered electroencephalic activity during the first 100 ms after each click was recorded and averaged digitally for 1,024 consecutive stimuli. The response pattern in the nonanesthetized dog was a repeatable polyphasic configuration characterized by 3 to 4 major waves. Peaks of the waves were labeled, using a method developed in human beings. Mean latency ranges for the positive (P) or negative (N) peaks that comprised the waves across intensity levels were 7.43 to 7.77 ms (No), 11.07 to 11.57 ms (Po), 13.62 to 14.20 ms (Na), 20.04 to 20.68 (Pa), 39.08 to 39.37 ms (Nb), and 54.25 to 55.21 ms (Pb). The only variations in waveform morphologic features were the additional wave formed by peaks Nx (24.80 to 25.94 ms) and Px (30.0 to 30.62 ms), which occurred in 44% of the records, and the missing wave formed by No and Po in 6.6% of the records. Varying the stimulus intensity had no effect (P less than 0.05) on wave amplitude or latency.(ABSTRACT TRUNCATED AT 250 WORDS)

Acoustic Stimulation↗
PubMed1978

Comparison of the averaged evoked cisterna cerebellomedullaris potential, cortical potential, and neurologic examination in the diagnosis of spinal cord injury of the dog.

Average cerebrocortical potentials (ECP) and cisterna cerebellomedullaris potentials (ECMP), evoked by ulnar and sciatic nerve stimulation, were compared with neurologic examination to evaluate their accuracy in the diagnosis of the degree of experimental spinal injury in 24 Beagles. The dogs were divided into 2 equal groups. Various impact forces were applied to the spinal cord at L1 of 1 group of dogs and various degrees of compression forces were applied to the spinal cord at L1 of the other group of dogs. The degrees of functional loss in both groups of dogs extended from mild to complete. The dogs were untreated and monitored for 30 days after injury. A short-acting barbiturate was compared with a long-acting barbiturate as the means of anesthesia; both were found to permit similar production of ECP and ECMP. The ECMP was found to be a more sensitive, more easily interpreted, and more consistent means of evaluating the degree of spinal injury than the ECP or the neurologic examination.

Anesthesia↗
PubMed1993

Immobilization and anesthesia of two hand-reared zebras.

This report describes our experiences with 2 drug combinations that were used safely and effectively to immobilize and anesthetize 2 hand-reared zebras. Zebras were sedated with xylazine hydrochloride or detomidine. The latter is more potent and of more use in healthy, vigorous animals. Anesthesia was induced with thiamylal/guaifenesin or tiletamine/zolazepam. The latter is more convenient because a quick, simple IV injection will preclude the necessity for physical restraint required to administer a large volume of guaifenesin/thiobarbiturate combination. Tracheal intubation was easily accomplished with either induction regimen, and inhalation anesthetic was used for longer periods of anesthesia.

Anesthesia↗
PubMed1996

Evaluation of five common induction protocols by comparison of hemodynamic responses to surgical manipulation in halothane-anesthetized horses.

OBJECTIVE: To determine whether hemodynamic responses of halothane-anesthetized horses undergoing surgical procedures depended on anesthetic induction protocols used, and to determine whether hemodynamic responses to surgical manipulation could be detected. DESIGN: Prospective experimental study without controls. ANIMALS: 36 clinically normal horses. PROCEDURE: Horses were allotted to 5 groups according to anesthetic induction protocol: acepromazine/guaifenesin/thiamylal, acepromazine/guaifenesin/ketamine, xylazine/guaifenesin/thiamylal, xylazine/guaifenesin/ketamine, and xylazine/diazepam/ketamine. Anesthesia was maintained with halothane. Hemodynamic measurements and blood gas values were obtained prior to the start of surgery, during surgery, and after surgery. RESULTS: Few differences in hemodynamic measurements existed between horses in which anesthesia was induced by 5 anesthetic induction protocols, whether prior to the start of surgery or for pooled values for all 3 measurement periods. Hemodynamic responses to surgical manipulation were marked and included increased mean arterial pressure and systemic vascular resistance, and decreased cardiac index and oxygen delivery. CLINICAL IMPLICATIONS: Choice of anesthetic induction protocol has little impact on hemodynamic function during surgery in halothane-anesthetized horses. Surgical stimulation may increase blood pressure, but does not improve cardiac index or oxygen delivery.

Acepromazine↗