title: Prolongation of pancuronium-induced neuromuscular blockade by intravenous infusion of nitroglycerin.
abstract: Based upon clinical observation of undue prolongation of pancuronium-induced blockade in the presence of intravenous infusion of nitroglycerin, neuromuscular blockades produced by pancuronium, succinylcholine and d-tubocurarine were studied in 51 cats using the sciatic-gastrocnemius nerve-muscle preparation. Pancuronium-induced blockade was found to be significantly prolonged (P less than 0.1) in the presence of a nitroglycerin infusion of 1 microgram/kg/min (65 vs. 127 min). Less, but still significant, prolongation occurred when nitroglycerin, 0.5 microgram/kg/min, was infused. The intravenous infusion of nitroglycerin must be started prior to the pancuronium injection for the block to be prolonged. Neuromuscular blocks produced by succinylcholine and d-tubocurarine were not altered by nitroglycerin. In experiments using the isolated rat diaphragm preparation, the depth of pancuronium-induced block was found not to be changed by nitroglycerin, suggesting an effect of nitroglycerin on the process of recovery from blockade. These findings indicate a selective pancuronium-nitroglycerin interaction.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002415:Cats; D004305:Dose-Response Relationship, Drug; D007263:Infusions, Parenteral; D008297:Male; D009469:Neuromuscular Junction / Q000187:drug effects*; D005996:Nitroglycerin / Q000008:administration & dosage*; D010197:Pancuronium / Q000494:pharmacology*; D051381:Rats; D013390:Succinylcholine / Q000494:pharmacology; D013997:Time Factors; D014403:Tubocurarine / Q000494:pharmacology
chemical_list: D005996:Nitroglycerin; D013390:Succinylcholine; D010197:Pancuronium; D014403:Tubocurarine