Survival of Dogs with Bilateral Phrenectomy and Extensive Transection of Intercostal Nerves

Summary

Seven dogs were kept in good health and without respiratory distress for periods varying between 9 and 67 days after bilateral phrenectomy. All of the animals were eventually sacrificed, none died as a result of paralyzing the diaphragm. Electrical stimulation and microscopic examination proved that the phrenectomies were complete in all cases. It was established that following paralysis of the diaphragm at least half of the intercostal nerves, either upper or lower, may be sectioned without loss of the animal. The conclusion drawn is that reports or statements to the effect that the diaphragm is essential for life in otherwise intact grown dogs are erroneous.