Central cardiovascular effects of narcotic analgesics and enkephalins in rats.

1. The cardiovascular effects of morphine, fentanyl, [D-Ala2]-met-enkephalinamide were analyzed after intracisternal injection in anaesthetized rats. PaO2 was measured as an index of respiratory function. 2. At low doses in spontaneously breathing rats, morphine, fentanyl and [D-Ala2]-met-enkephalinamide induced a pressor response with slight tachycardia… CONTINUE READING