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1 Departments of Surgery and Medicine, University Hospitals, University of Wisconsin and the Veterans Administration Hospital
The following techniques for studying cardiopulmonary physiology in chronic closed chest canine operations have been discussed: a) chronic tracheostomy, permitting awake intubations; b) tracheal separation for bronchospirometry including a reliable new bronchospirometry tube for dogs. Unsuccessful efforts at creating cutaneous left mainstem bronchostomies have been described; c) indwelling vascular catheters, functioning up to three years; d) implantable flow meters.
These methods are available to the average physiologic laboratory at this time, while telemetric techniques yielding the same information are not.
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