H-J Lee

Pusan National University, Tsau-liang-hai, Busan, South Korea

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Publications (4)11.24 Total impact

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    ABSTRACT: Although remifentanil provides profound analgesia during operation, postoperative occurrence of hyperalgesia and tolerance after remifentanil administration could be a challenge to the postoperative pain control. In this investigation, we sought to determine the effect of maintenance with propofol or sevoflurane on postoperative analgesia after remifentanil-based anaesthesia. Two hundred and fourteen women undergoing breast cancer surgery under remifentanil-based general anaesthesia were randomly included in this prospective and double-blind trial. The patients were anaesthetized with sevoflurane (S) or propofol (P) under high (H) or low (L) effect-site concentration (Ce) of remifentanil-based anaesthesia using a target-controlled infusion system; the patients were allocated into the SH, SL, PH, and PL groups. Pain intensity (visual analogue score, VAS) and cumulative morphine requirements were recorded 30 min, 1, 6, 12, and 24 h after operation. The patient characteristics were similar. Cumulative morphine consumption at 24 h after surgery was higher in the SH group [38.6 (sd 14.9)] compared with the SL [31.5 (3.7)], PH [31.7 (8.3)], and PL groups [30.1 (6.1)] (P<0.001). The VAS scores during 24 h after surgery were also higher in the SH group than the SL, PH, and PL groups (P<0.001). Remifentanil hyperalgesia was induced by high dose of remifentanil-based anaesthesia during sevoflurane anaesthesia, whereas that was not apparent during propofol anaesthesia. Also, remifentanil hyperalgesia did not occur during low dose of remifentanil-based anaesthesia. Maintenance of propofol during high-dose remifentanil-based anaesthesia provided better postoperative analgesia.
    BJA British Journal of Anaesthesia 09/2010; 105(5):661-7. DOI:10.1093/bja/aeq257 · 4.35 Impact Factor
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    ABSTRACT: Sevoflurane is a widely used inhalation anesthetic, but there are no studies on its effect on the wound-healing process. This study was undertaken to evaluate the effect of exposure time to sevoflurane on wound healing. Male Sprague-Dawley rats were used. Two circular full-thickness skin defects 8 mm in diameter were made on the dorsum of the rats. The animals were divided into six groups according to exposed gas type and time: S1 (sevoflurane, 1 h), S4 (sevoflurane, 4 h), S8 (sevoflurane, 8 h), O1 (oxygen, 1 h), O4 (oxygen, 4 h), and O8 (oxygen, 8 h). The surface area of the wounds was measured 0, 1, 3, and 7 days after surgery. Separately, the mean blood pressures (MBP) and arterial oxygen pressures (PaO(2)) were monitored during the sevoflurane exposure. Collagen type I production and transforming growth factor-beta1 (TGF-beta1) and basic fibroblast growth factor (bFGF) expression on the wound surface were analyzed. Routine histological analysis was also performed. Exposure duration to sevoflurane had no influence on MBP and PaO(2). The reduction in wound size and collagen type I production was delayed in S8. The expression of TGF-beta1 and bFGF on the wound surface in S8 was significantly attenuated in S8. The histology of the S8 demonstrated a delayed healing status. Prolonged exposure to sevoflurane might alter the inflammatory phase of the wound-healing process by attenuation of growth factor expression such as TGF-beta1 and bFGF and subsequently by reduced collagen production.
    Acta Anaesthesiologica Scandinavica 08/2010; 54(7):885-93. DOI:10.1111/j.1399-6576.2009.02190.x · 2.31 Impact Factor
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    ABSTRACT: Wrinkle-based measurement of elastic modulus for a nano-scale thin film was analyzed. As a demonstrative example, the wrinkles of Pt films on a Polydimethylsiloxane (PDMS) substrate under compressive loading were formed with a well-defined wavelength, corresponding to the difference of elastic moduli between the films and substrates. The elastic modulus of the Pt nano-scale thin film measured with the wrinkle-based measurement was found to be consistent with that independently measured with micro-tensile test. Uncertainty of the wrinkle-based measurement was analyzed to figure out the main uncertainty components for the evaluation of elastic modulus measurement, and guidelines for the reliable wrinkle-based measurement were suggested. KeywordsNano-scale thin film-Pt-Wrinkle-Elastic modulus-Tensile test
    Experimental Mechanics 06/2009; 50(5):635-641. DOI:10.1007/s11340-009-9243-8 · 1.57 Impact Factor
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    ABSTRACT: The purpose of this study was to investigate the acceptability and therapeutic efficacy of a preoperative single administration of long-acting 5-hydroxytryptamine type 3 (5-HT 3) receptor antagonist in an orally disintegrating tablet formulation, ramosetron, in breast cancer patients. Two hundred and forty women, ASA I-II, aged 24-60 yr, undergoing elective breast cancer surgery, were randomized. A standardized anaesthetic technique was used. Patients were assigned to receive one of three treatment regimens (n = 80 in each group): no prophylactic antiemetics (Group A), single prophylactic intravenous injection of ramosetron 0.1 mg at the completion of surgery (Group B) or preoperatively oral administration of 0.1 mg of ramosetron (Group C). Episodes of nausea and vomiting, the use of rescue antiemetic treatment, degree of pain, adverse events and level of satisfaction were recorded. The overall incidence of nausea and vomiting during the first 24 h after the recovery in Groups B (27.8%) and C (25%) was decreased significantly compared with Group A (75.3%). The frequency of the use of rescue antiemetics was significantly lower in Group C (5.0%) compared with Groups A (53.2%) and B (15.2%). The patients in Group C were more satisfied with control of postoperative nausea and vomiting than others. Preoperative oral administration of ramosetron at a dose of 0.1 mg is an acceptable and effective way of reducing the incidence of postoperative nausea and vomiting in breast cancer patients.
    European Journal of Anaesthesiology 05/2008; 25(9):756-62. DOI:10.1017/S0265021508004262 · 3.01 Impact Factor

Publication Stats

43 Citations
11.24 Total Impact Points

Institutions

  • 2008–2010
    • Pusan National University
      • School of Medicine
      Tsau-liang-hai, Busan, South Korea
  • 2009
    • Korea Institute of Machinery and Materials
      Sŏul, Seoul, South Korea