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The rate of eyelid reflex loss following thiopental administration in hypo- and hypergonadism in rabbits.
Med. Sci. Monitor 2002: 8 (5) s.BR179-BR183, il., tab., bibliogr. 13 poz.
Hasła klasyfikacyjne GBL:
ginekologia i położnictwo
The aim of this research was to explain whether different hormonal conditions caused by disturbed concentrations of estrogens and progesterone might lead to alteration of CNS reaction following administration of the hypnotic agent thiopental. The investigated factor was the rate of loss of the eyelid reflx after intravenous thiopental administration, since this corresponds with loss of consciousness. The investigation was performed in 24 sexually mature female Chinchilla rabbaits divided into 4 groups of 6 rabbits each. The animals were oophorectomized (hypoprogesterone/hypoestrogen), hyperestrogen (sham surgery plus estradiol injections), or normal (sham surgery). Twelve weeks later, thiopental (40 mg/ml) was infused through the intravenous cannula at a constant rate (90 ml/hour) until loss of the eyelid reflex, at which time blood was sampled for determination of thiopental, á-estradiol, progesterone and 17ŕ-hydroxyprogesterone concentrations. The ANOVA and Tukey tests were applied in statistical analysis (p = 0.05). Hyperprogesterone rabbits lost consciousness faster (138 ń 34.6 sec), at a lower plasma thiopental concentration (46.3 ń 6.6 ćg/ml), and required less thiopental (24.63 ń 6.44 mg/kg) than controls; hypoprogesterone rabbits lost consciousness slover (207.5 ń 30.9 sec), at a higher plasma thiopental concentration (129.2 ń 24.9 ćg/ml), and required more tiopental (38.51 ń 2.33 mg/kg) than controls. The time of sleep induction in the control group was 190 ń 25.7 sec.; the serum thiopental concentration was 77.8 ń 13.9 ćg/ml, and the total thiopental consumption was 35.8 ń 3.51 mg/kg. Estrogen status has no effect. Various hormonal states are accompanied by different CNS reactions to thiopental. Among the studied groups of sex steroids, only progestins significantly modify the CNS response to barbiturate infusion.
The influence of controlled hypotension on splanchnic mucosal perfusion using gastric tonometry in patients undergoing resection of meningioma.
Med. Sci. Monitor 2002: 8 (1) s.CR28-CR30, tab., bibliogr. 9 poz.
Hasła klasyfikacyjne GBL:
dorośli 19-44 r.ż.
dorośli 45-64 r.ż.
Background: The aim of our research was to evaluate the influence of general anesthesia with controlled nitroglycerin-induced hypotension on splanchnic mucosal perfusion using gastric tonometry. Material/Methods: In six patients (1 female, 5 males, median age 46 years, range 32 - 62) undergoing elective resection of meningiomas, measurements of gastric mucosal perfusion were taken by nasogastric tonometry. Controlled hypotension was initiated after craniotomy and terminated prior to hemostasis procedures. The mean arterial blood pressure (MAP) was maintained 25 - 30 p.c. below initial parameters during controlled hypotension. The adequacy of perfusion was defined by the intramucosal pH (pHi) and the difference between arterial and intramucosal pH (pHGAP). All parameters were analyzed before the induction of controlled hypotension, after the 1st, 2nd, and 3rd hour, and 1 hour after the termination of controlled hypotension. Results: The MAP decreased during controlled hypotension by ca. 26.5 p.c. (min. 21.1 p.c.; max 31.6 p.c.). The lower MAP was accompanied by a statistically significant increase in heart rate. A significant increase from baseline in regional prCO2 was seen after teh 1st, 2nd, and 3rd hour of controlled hypotension. Intramucosal pH values decreased significantly during the same period, from 7.428 ń 0.032 to 7.372 ń 0.015. Despite these statistically significant differences during controlled hypotension, the pH, values were always greater than 7.35, and the pHGAP values were lower than 0.05, which were recognized as being within the normal range. Conclusions: Controlled hypotension allows accurate evaluation of the blood flow quality at the level of microcirculation. Mild controlled hypotension slightly alters splanchnic mucosal perfusion.
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