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Journal of Korean Neurosurgical Society > Volume 18(2); 1989 > Article
Journal of Korean Neurosurgical Society 1989;18(2): 235-244.
Effect of Intracerebroventricular Digitalis on Cardiovascular System of Rabbits.
Jai Wook Song, Sam Suk Kang, Jung Hyun Woo
Department of Neurosurgery, Chonnam University Medical School, Kwangju, Korea.
ABSTRACT
Influences of intracerebroventricular(icv) ouabain on cardiovascular system and on pressor response to raised intracranial pressure(ICP) were investigated in urethane-anesthetized rabbits. Intravenous(iv) 40 microgram/kg ouabain did not affect blood pressure of rabbit. Icv ouabain(5, 10, 20 microgram/kg) and digoxin(6.25, 12.5 microgram/kg) produced dose-dependent pressor responses and marked decrease of heart rate. After bilateral vagotomy, the bradycardiac effect of ouabain disappeared, while the pressor effect was significantly potentiated. The ouabain-induced pressor effect was not affected by iv and icy phentolamine or propranolol, and significantly inhibited by icy infusion of lidocaine(0.1 mg/kg/min) and diazepam(0.025 mg/kg/min). The pressor response to raised ICP was not affected by iv 40 microgram/kg ouabain but disappeared by icy 10 microgram/kg ouabain and 6.25 microgram/kg digoxin. These data suggests that ouabain causes pressor effect through direct interaction with a site(s) in central nervous system and bradycardiac effect by direct activation of vagal center, and ouabain blocks central sympathetic stimulation by increase of ICP in rabbits.
Key Words: Intracranial pressure; Digitalis; Intracerebroventricular; Experiment
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