title: Neuromuscular block by circulating D-tubocurarine residue following uptake and distribution.
abstract: Serum concentration of d-tubocurarine decreases rapidly after intravenous injection because of uptake and distribution. The circulating residue of an ED 50 dose of d-tubocurarine five minutes after injection will produce no block in a previously unexposed neuromuscular junction. To produce a 50 per cent block with the circulating d-tubocurarine residue in a previously unexposed neuromuscular junction requires an initial injection of 2.5 x ED 50 dose. Five minutes after a dose 5 to 6 times the ED 50, the plasma d-tubocurarine residue is sufficient to produce a total block.
mesh_terms: D000818:Animals; D002415:Cats; D005260:Female; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009469:Neuromuscular Junction / Q000187:drug effects*; D009435:Synaptic Transmission / Q000187:drug effects; D013997:Time Factors; D014403:Tubocurarine / Q000097:blood* / Q000494:pharmacology
chemical_list: D014403:Tubocurarine