Jul 1, 1978

Actions of tetrahydropapaveroline on the cardiovascular system and skeletal muscles of the anaesthetized cat and on guinea-pig soleus muscle in vitro

Clinical and Experimental Pharmacology & Physiology
M W Nott, G A Head

Abstract

1. Tetrahydropapaveroline (THP) and isoprenaline have been compared for effects on heart rate, diastolic blood pressure and contractions of soleus and tibialis muscles in chloralose-anaesthetized cats and on in vitro guinea-pig soleus muscles. 2. All effects of THP were similar to those of isoprenaline. Maximal responses were the same and responses to both drugs were antagonized by propranolol. 3. THP produced an increase in heart rate, a fall in diastolic blood pressure and a decrease in the tension and degree of fusion of incomplete tetanic contractions of the soleus, being, respectively, 12.9, 14.7 and 19.6 times less potent than isoprenaline. The similarity in potency ratios suggests that THP is a non-selective beta-adrenoceptor agonist. 4. Effects on the guinea-pig soleus in vitro were similar to those in the cat soleus. 5. In the cat, THP enhanced the tension and duration of tibialis twitches, but the tibialis was about ten times less sensitive than the soleus to the effects of THP. 6. THP deepened neuromuscular blockade in partially curarized cat soleus and tibialis preparations. Doses required were ten times greater than for direct depressant effects on the soleus. 7. Agents which depress the tension and fusion of inco...Continue Reading

Mentioned in this Paper

Diastolic Blood Pressure Measurement
Pavatym
Exertion
Cavia
Cardiovascular System
Neuromuscular Inhibition
Diastolic Blood Pressure
Antagonist Muscle Action
Contraction (Finding)
Plant fiber

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