Anesthesia and analgesia
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Anesthesia and analgesia · May 1995
Randomized Controlled Trial Clinical TrialArterial and jugular venous bulb blood propofol concentrations during induction of anesthesia.
The aim of this study was to show that blood propofol concentrations at loss of consciousness vary with the rate of administration. Eighteen patients were allocated to receive a propofol infusion at 6 or 12 mg.kg-1.h-1 (approximately 8 and 15 mg/min) for induction of anesthesia. Propofol concentrations were analyzed from simultaneous arterial and jugular bulb venous blood samples. ⋯ There were no significant differences between the groups in the area between the arterial and venous time concentration curves from start of infusion to loss of consciousness (3.14 and 3.05 micrograms.mL-1.min-1). This study confirms that a target blood concentration of propofol cannot be identified with loss of consciousness under nonsteady state conditions. Both arterial and venous blood propofol concentrations at loss of consciousness depend on the rate of administration.
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Anesthesia and analgesia · May 1995
Histamine concentrations and hemodynamic responses after remifentanil.
Remifentanil is a new potent opioid analgesic that undergoes rapid esterase metabolism. The purpose of this study was to investigate hemodynamic responses to 2-30 micrograms/kg remifentanil (escalating doses) injected as a bolus over 1 min during general anesthesia. ⋯ Arterial blood was taken for histamine determinations before drug administration and then at 1, 3, and 5 min after drug administration. Administration of remifentanil was associated with a reduction in systolic blood pressure from 134 +/- 18 to 91 +/- 16 mm Hg and heart rate from 99 +/- 20 to 69 +/- 21 bpm and was not associated with alterations in histamine concentration.
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Anesthesia and analgesia · May 1995
Postoperative nausea and vomiting after discharge from outpatient surgery centers.
We examined patients' experiences with nausea and vomiting after they were discharged from outpatient surgical centers. Data were collected on 211 surgical outpatients at 24-48 h after discharge via a telephone interview conducted by outpatient surgery nurses, and at 5 days after discharge via a patient-completed questionnaire. Telephone interviews were conducted with 193 patients. ⋯ Patients who experienced postdischarge nausea and vomiting were not able to resume their normal daily activities as quickly as those who did not. Patients managed postdischarge nausea and vomiting with little contact or intervention from health professionals and with minimal product purchases. The results indicate that postdischarge nausea and vomiting is common after outpatient surgery, and that it results in substantial distress and impairment for patients who experience it.
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Anesthesia and analgesia · May 1995
Comparative StudyHydroxyethyl starch versus lactated Ringer's solution in the chronic maternal-fetal sheep preparation: a pharmacodynamic and pharmacokinetic study.
Administration of fluids intravenously prior to spinal and epidural analgesia in obstetrics is required to prevent maternal hypotension and fetal hypoxia. A colloid solution, such as hydroxyethyl starch (HES), might be preferable considering the capacity to stay intravascularly for a longer period. In this study the placental transfer of HES and the hemodynamic effects after infusion were investigated using a chronic maternal-fetal sheep preparation. ⋯ In contrast, infusion of RL did not significantly change these variables. Infusion of HES increases UBF, CO, and uterine and total oxygen-carrying capacity in the pregnant ewe. No significant transplacental transfer of HES was shown.