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To assess the effects of dexmedetomidine (Dex) on propofol dosage in target-controlled infusion (TCI) and hemodynamics in patients undergoing laparoscopic surgery under general anesthesia.Sixty patients undergoing laparoscopic surgery under general anesthesia were randomly divided into control group (n=30) and the Dex group (n=30). The patients in Dex group received a loading dose of Dex (1 µg/kg, infused within 10 min) before the surgery followed by continuous infusion at the rate of 0.3 µg·kg(-1)·h(-1) till the end of the surgery, and the control patients received saline infusion in the same manner. Heart rate, blood pressure, bispectral index (BIS), and propofol dose in TCI were recorded during induction and maintenance of anesthesia. The incidence of hypotension and bradycardia were observed during and after the surgery.No difference was found in the incidence of hypotension and bradycardia between the control group and Dex group (P0.05), but heart rate and blood pressure were lower in Dex group during extubation (P0.05). The dose of propofol in TCI was significantly less in Dex group than in the control group (P0.05).Dex can reduce hemodynamic abnormalities caused by extubation and decrease the dosage of propofol in TCI, and may serve as an ideal adjuvant drug for general anesthesia.

Taking account of the coupling differential equations under the effect of Stokes and anti-Stokes for the pump wave linearly polarized and aligned with the x-axis direction,the gain coefficient for the Stokes and anti-Stokes have been derived from simultaneously act of stimulated Raman scattering and parametric amplification in the same x polarization.The Lorenz model of parallel gain coefficient is introduced in this equation. The correlation between the gain spectrum and correlative parameter studied in dispersion-shifted fiber.The conclusion shows that gain spectrum is dissymmetrical with the Stokes and anti-Stokes wave and has no relation with third-order dispersion.At the same time,the ratio of Stokes and anti-Stokes |E_(ax)/E_(sx)| increases with frequency shift,then it rapidly reduced.

To assess the feasibility of using subclinical doses of pentazocine in painless egg retrieval.Eighty-one patients undergoing painless egg retrieval were randomized into the observation group and the control group to receive 0.4 mg/kg pentazocine with 1.5 mg/kg propofol and 0.5 mg/kg pentazocine with 1.5 mg/kg propofol, respectively. The mean arterial pressure (MAP), heart rate (HR), SPO(2), respiratory rate (RR), unconsciousness time, awake time, hospital stay, complications, consciousness during the operation and adverse effects were compared between the two groups.The two groups showed no significant differences in the analgesic effect, dosage of propofol, adverse effects, unconsciousness time, awake time, or hospital stay. But compared with the control group, the observation group showed greater intraoperative consciousness but with more stable respiration.Subclinical doses of pentazocine can be used in the painless egg retrieval, but the dose of propofol should be increased to reduce the body activity during the operation.

To define the possible risk factors for early complications following anterior surgery for cervical spondylotic myelopathy.Two hundred and fifty-eight cases of cervical spondylotic myelopathy receiving anterior surgery between January 1992 and December 2003 were reviewed and the gender, age and other factors of the patients were analyzed with single-factor analysis and multiple logistic regression.Complications arising in the early stage after the surgery were found in 19 cases (20 events), with an incidence rate of 7.4%;. Single-factor analysis showed that the two factors, paralysis and surgical approaches, were correlated with the early complications, and paralysis was identified as the major factor determining the occurrence of these complications by multiple logistic regression.Paralysis is the major factor related to the occurrence of early complications following anterior surgery for cervical spondylotic myelopathy, which reiterates the importance of proper perioperative management.