Investigation of the use of three electroencephalographic electrodes for long-term electroencephalographic recording in awake and sedated dogs.

Objective: To compare electroencephalography (EEG) artifact associated with use of the subdermal wire electrode (SWE), gold cup electrode (GCE), and subdermal needle electrode (SNE) over an 8-hour period in sedated and awake dogs.

Animals: 6 healthy dogs.

Procedures: 8 EEG channels were recorded during 20-minute video-EEG recording sessions (intermittently at 0.

Regions in the brainstem and frontal cortex where electrical stimulation elicits parotid and submandibular saliva secretion in sheep.

Acute experiments were conducted in sheep anaesthetized with sodium pentobarbital to identify regions in the brain where electrical stimulation would elicit secretion by the parotid and submandibular salivary glands. This was a prerequisite for single unit studies in the future. In the brainstem, parotid and submandibular secretions were evoked on average between 7 and 16 mm rostral to obex and from 1 to 11 mm lateral to midline, with the parotid gland being active on the caudal and the submandibular on the rostral sides of this region.

Electrical stimulation of the medial frontal lobe elicits a pattern of body movements in sheep.

Acute experiments were conducted in sheep anaesthetized with sodium pentobarbital to identify regions in the brain where electrical stimulation would elicit movements of body parts. Stimulating the dorsal frontal cortex 2 mm from midline from the front of the brain backward for 30 mm caused movements, in order, of the lower jaw, face in general, neck, shoulder and front and back legs.

Technical note: reversible re-entrant cannulation of the parotid duct in cattle using a new injection anesthesia regimen.

A new method for reversible reentrant cannulation of the parotid duct in cattle by use of an injectable anesthetic regimen is described. Ruminal contents were removed before anesthesia instead of food deprivation. The parotid duct was dilated by means of a long hemostatic forceps: its jaws were encased in a piece of plastic tube, and the tip was extended by a piece of flexible wire.

Attempts to modify reperfusion injury of equine jejunal mucosa using dimethylsulfoxide, allopurinol, and intraluminal oxygen.

This study compared the severity of ischemic injury to the equine jejunal mucosa caused by arteriovenous obstruction (AVO) or venous obstruction (VO) with that caused by reperfusion after ischemia. The degree of mucosal damage and regeneration was scored according to a modified version of an established light microscopic classification for ischemic injury. Biopsy specimens taken after 3 and 4 hours of obstruction, and after 3 hours of obstruction and 1 hour of reperfusion, were compared.