Abstract:
PURPOSE:To elucidate the mechanisms of the more profound hypotensive effects of propofol relative to thiamylal, we monitored changes in left ventricular (LV) preload, afterload, and contractility during the course of anesthetic induction with propofol and thiamylal. METHODS:Thirty-two patients (ASA I) were randomly assigned into two groups and injected with propofol (2 mg.kg(-1)) or thiamylal (4 mg.kg(-1)) as anesthetic induction agents. Transthoracic echocardiography (TTE) was used to assess LV performance before and during induction by the two anesthetics. The LV end-diastolic area (EDA) and LV end-systolic wall stress (ESWS) were used as indices of LV preload and LV afterload, respectively, while LV contractility was assessed by the fractional area change (FAC). RESULTS:Both propofol and thiamylal significantly reduced EDA and ESWS without significant change in FAC. Propofol-induced reductions in EDA and ESWS were significantly greater than those of thiamylal. CONCLUSION:The more profound hypotension observed during induction of anesthesia with propofol is due to the greater decrease in preload and afterload than with thiamylal, but not to a decrease in LV contractility.
journal_name
J Anesthjournal_title
Journal of anesthesiaauthors
Yamaura K,Hoka S,Okamoto H,Kandabashi T,Akiyoshi K,Takahashi Sdoi
10.1007/s005400070021subject
Has Abstractpub_date
2000-01-01 00:00:00pages
138-42issue
3eissn
0913-8668issn
1438-8359journal_volume
14pub_type
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