title: The effects of d-tubocurarine, pancuronium and atracurium on the responses of gastrocnemius and soleus muscles in the cat.
abstract: In vivo, the effects of d-tubocurarine (0.20 mg kg-1), pancuronium (0.015 mg kg-1) and atracurium (0.15 mg kg-1) on the responses of the indirectly stimulated cat gastrocnemius (fast) and soleus (slow) muscles to a twitch, train-of-four and tetanic stimuli were studied. The soleus muscle demonstrated a greater degree of fade than the gastrocnemius in response to tetanic stimuli (50 Hz). There was no difference between the responses of the two muscles to twitch or train-of-four stimuli with any of the drugs. Recovery of train-of-four ratio occurred more rapidly than did the tetanic fade ratio. At a time when train-of-four ratio exceeded 0.7, tetanic fade was still evident, especially in the soleus muscle.
mesh_terms: D000818:Animals; D001279:Atracurium; D002415:Cats; D004558:Electric Stimulation; D066298:In Vitro Techniques; D007546:Isoquinolines / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D009132:Muscles / Q000294:innervation; D009466:Neuromuscular Blocking Agents / Q000494:pharmacology*; D009469:Neuromuscular Junction / Q000187:drug effects*; D010197:Pancuronium / Q000494:pharmacology*; D013746:Tetany / Q000209:etiology; D013997:Time Factors; D014403:Tubocurarine / Q000494:pharmacology*
chemical_list: D007546:Isoquinolines; D009466:Neuromuscular Blocking Agents; D001279:Atracurium; D010197:Pancuronium; D014403:Tubocurarine