Anesthesia and analgesia
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Anesthesia and analgesia · Aug 1990
Randomized Controlled Trial Comparative Study Clinical TrialPostoperative pain control with a continuous infusion of epidural sufentanil in the intensive care unit: a comparison with epidural morphine.
A prospective, randomized, double-blind trial was conducted to compare the analgesic actions and side effects of sufentanil continuously infused (5 micrograms/h) into the lumbar epidural space (L2-3) with those of an infusion of lumbar epidural morphine (0.5 mg/h). Forty patients admitted to an intensive care unit after elective major abdominal surgery participated over a varying period of 24-40 h. Post-operative pain was treated with an epidural bolus of either sufentanil (50 micrograms) or morphine (5 mg), followed by a continuous infusion of the same opiate. ⋯ The incidence of nausea and vomiting, pruritus, and drowsiness was similar in the two groups. In spontaneously breathing patients there were no respiratory complications requiring treatment. Forced vital capacities were statistically significantly better during the first 1-4 h with sufentanil.
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Anesthesia and analgesia · Aug 1990
Cardiovascular actions of common anesthetic adjuvants during desflurane (I-653) and isoflurane anesthesia in swine.
To determine the cardiovascular actions of drugs commonly combined with inhalation anesthetics, we administered one drug from each of several classes of adjuvants to seven swine already anesthetized with equipotent concentrations (1.2 MAC) of desflurane, formerly I-653, a new inhaled anesthetic, or isoflurane. Succinylcholine (1 and 2 mg/kg), atracurium (0.6 mg/kg), and atropine (5 micrograms/kg) plus edrophonium (5 mg/kg) had no cardiovascular effects. Fentanyl was given in amounts that decreased MAC for the inhaled anesthetics by 25%-35%. ⋯ Thiopental (2.5 and 5.0 mg/kg IV) decreased mean aortic blood pressure, cardiac output, stroke volume, and systemic vascular resistance during both anesthetics without altering heart rate or left- or right-sided cardiac filling pressures. The addition of 60% nitrous oxide caused no cardiovascular changes during desflurane anesthesia, but increased systemic vascular resistance and decreased cardiac output and stroke volume during isoflurane without altering heart rate or cardiac preload. We conclude that the usual clinical doses of adjuvants commonly administered during anesthesia have no untoward cardiovascular actions during 1.2 MAC desflurane or isoflurane anesthesia in swine.
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Anesthesia and analgesia · Aug 1990
Effects of halothane on intraocular pressure in anesthetized children.
Intraocular pressure (IOP) measurements in children are usually performed under nitrous oxide and halothane anesthesia. We studied the effects of both time and end-tidal halothane concentration on IOP in 80 children (mean age +/- SD = 4.5 +/- 2.9 yr), to determine the most optimal time to make such measurements in anesthetized children. In 30 children the end-tidal halothane and nitrous oxide concentrations were kept constant while IOP was measured at 1-min intervals after the induction of anesthesia. ⋯ Intraocular pressure did not differ significantly at either halothane concentration but increased after tracheal intubation. We conclude that in patients anesthetized with halothane and nitrous oxide, IOP after induction remains constant over time and is not affected by end-tidal halothane concentrations up to 1.0% but is affected by tracheal intubation. Thus, the optimal time to measure IOP in children receiving up to 1% halothane in 66% nitrous oxide is during the first 10 min after induction, but before tracheal intubation.
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Anesthesia and analgesia · Aug 1990
High spinal anesthesia does not depress central nervous system function as measured by central conduction time and somatosensory evoked potentials.
Short-latency somatosensory evoked potentials (SSEPs) in response to median nerve stimulation were recorded from the neck and the scalp before and during diagnostic high spinal anesthesia (touch T3, pinprick C8) in six patients with chronic pain. The central conduction time--the time difference between the neck-recorded N13 and the scalp-recorded N20--and the amplitudes of the SSEPs did not change in a statistically significant way during high spinal anesthesia. ⋯ This may have been due to a local anesthetic effect on those spinal roots of the median nerve in which segmental pinprick analgesia occurred. Because high spinal anesthesia did not depress central nervous function, as measured by central conduction time, and SSEP amplitudes, it is concluded that scalp-recorded SSEPs during high spinal anesthesia measure the effects of local anesthetics in the cerebrospinal fluid on neuronal pathways outside the brain.