Segal, B S Respiratory responses of piglets to hypercapnia during postnatal development: effects of opioids. [electronic resource] - Pediatric pulmonology 1991 - 113-9 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. ISSN: 8755-6863 Standard No.: 10.1002/ppul.1950110207 doi Subjects--Topical Terms: AnimalsAnimals, Newborn--physiologyCarbon Dioxide--physiologyEndorphins--physiologyHeart Rate--physiologyHypercapnia--physiopathologyNaltrexone--pharmacologyOxygen--physiologyPulmonary Ventilation--drug effectsSwineSwine, MiniatureTidal Volume--drug effects