The Comparison of Maternal Hemodynamics and Infant's Apgar Score between the Supine Position with and without Left Uterine Displacement for a Cesarean Section / 대한마취과학회지

BACKGROUND: It is commonly believed that the supine position with left uterine displacement is good for both the mother and the fetus for a cesarean section although all pregnant women do not suffer hypotension during the supine position. This study was to demonstrate whether maternal hemodynamics and infant's apgar score differences existed between the supine position with and without left uterine displacement for a cesarean section. METHODS: One hundred eighteen women for an elective repeat cesarean section were involved in this study. They were divided into 2 groups; (E) supine position (n = 65) and (C) supine position with left uterine displacement (n = 53). Hemodynamic variables (CO, CI, SVR, SVRI, SI, EF, MAP and HR) were measured at three different time points; preoperation, after intubation and 10 minutes after delivery by using a thoracic bioimpedence. The infant's apgar score was measured at 1 and 5 minutes after delivery. RESULTS: All the values of preoperation and at 10 min after delivery, were not different compared between the two groups (P > 0.05). However, after intubation, the values of HR, MBP and SVR of group C were increased significantly (P < 0.05) compared to those of group E. The infant's apgar scores (1 min, 5 min) were not different between the two groups. CONCLUSIONS: From these results, it might be thought that left uterine displacement is absolutely not necessary for an elective repeat cesarean section. However, left uterine displacement is recommended when maternal and fetal problems exist, regional anesthetic induced sympathetic blockade is done or preclampsia is diagnosed.

Expiratory Unidirectional Valve Malfunction Detected by Capnographic Waveform Change: A case report / 대한마취과학회지

Unidirectional valve (UDV) malfunction causes rebreathing of expired gas during anesthesia. However, the resultant hypercarbia without hypoxemia by UDV malfunction is not easily detected. We experienced a case of severe hypercarbia which caused by sticking expiratory valve at 45 minutes after the induction of anesthesia, in spite of checking UDV function preoperatively. In this case, expiratory UDV malfunction was diagnosed with the change of capnographic waveform. And so, we recommend monitoring of capnographic waveform during every anesthesia, in addition to preoperative UDV checking.

Lidocaine Pretreatment with Tourniquet Inflation Ameliorate Pain on Injection of Propofol / 대한마취과학회지

BACKGROUND: Venous lidocaine retention with tourniquet has a possibility to prevent propofol injection pain efficiently. We performed the study to assess the efficacy of various intravenous lidocaine pretreatment methods with tourniquet on reducing propofol-induced injection pain, especially the effect of varying the concentration and dose of lidocaine. METHODS: In order to know the effect of lidocaine pretreatment with tourniquet on prevention of propofol-induced injection pain, one hundred patients were divided into four groups by the method of pretreatment; 1% lidocaine of 1 mg/kg (lidocaine pretreatment, LPT1 n = 25); 0.5% lidocaine of 1 mg/kg (LPT2, n = 25); 1% lidocaine of 0.5 mg/kg (LPT3, n = 25); 5 ml of saline pretreatment (saline pretreatment, SPT, n = 25). After 5 minutes of pretreatment, propofol-induced pain was measured immediately after injection of 1 mg/kg propofol with tourniquet inflation and after deflation of tourniquet, and after a second injection of 1 mg/kg propofol by use of the numerical rating scale and pain score of four categories. We selected maximal values of three times measurement for comparison. RESULTS: All groups of lidocaine pretreatment (pain incidence of LPT1; 20%, LPT2; 16% and LPT3; 36%, respectively) significantly reduced the incidence of propofol-induced injection pain compared to the saline pretreatment group (96%) (P 0.05). CONCLUSIONS: This result indicates that lidocaine pretreatment with tourniquet has an effect on the prevention of propofol-induced injection pain. However, we recommend pretreatment with 0.5 1% lidocaine of 1 mg/kg by use of tourniquet and propofol injection immediately after deflation of the tourniquet in practice.