Effect-site concentration of remifentanil for blunting hemodynamic responses to tracheal intubation using light wand during target controlled infusion-total intravenous anesthesia / 대한마취과학회지

BACKGROUND: Transillumination using a light wand is an alternative type of laryngoscope used for tracheal intubation. There is little information available on the effect-site concentration of remifentanil required to control hemodynamic changes induced by tracheal intubation using the transillumination method during total IV anesthesia. We therefore conducted this study to determine the effect-site concentration of remifentanil blunting hemodynamic responses after tracheal intubation in patients receiving propofol anesthesia. METHODS: We enrolled 26 healthy adult patients (ASA physical status I-II), aged 16-67 scheduled for surgery within 2 hours. All patients received a target-controlled infusion of 4 microg/ml propofol. The effect-site target-concentration of remifentanil of 5.0 ng/ml was chosen for the first patient. We used the Dixon's up-and-down sequential allocation method for determining the next remifentanil concentration. The time required for tracheal intubation was measured as the level of intubation stimulation. RESULTS: The average intubation time was 13.9 +/- 9.1 seconds. From the Dixon's method, the EC50 of remifentanil blunting the hemodynamic response to tracheal intubation was 2.94 ng/ml. CONCLUSIONS: This study shows that effect-site concentrations of remifentanil of 2.94 ng/ml is effective in blunting sympathetic responses to tracheal intubation in 50% of patients with normal airway anatomy when combined with a target controlled infusion of propofol (4 microg/ml).

Anesthetic management of patient with congenital insensitivity to pain with anhidrosis (CIPA) by using BIS monitor: A case report

Congenital insensitivity to pain with anhidrosis (CIPA, or hereditary sensory and autonomic neuropathy type IV) is a rare, autosomal recessive disease, is characterized by inability to sweat, insensitivity to pain, recurrent episodes of hyperpyrexia, self-mutilation and mental retardation. Because of lacking autonomic response to painful stimuli, it is difficult to determine adequate depth of anesthesia in patients with CIPA. We report an anesthetic experience for child with CIPA who had undergone an orthopedic operation. Anesthesia was induced by propofol and maintained by Sevoflurane with 50% nitrous oxide and anesthetic depth was monitored by using bispectral index (BIS). Throughout the operation, anesthesia was maintained with low end-tidal Sevoflurane concentrations (<1.5 vol%), BIS was within 28-62 and vital signs were stable. After operation, he did not remember anything about the surgery. The BIS monitor may be a useful tool to guide the adequate depth of anesthesia for the patient with CIPA.

Anesthetic management of a neonate with Antley-Bixler syndrome: A case report

Antley-Bixler syndrome is a congenital anomaly of multiple bones and cartilage, and this was first reported by Antley and Bixler in 1975. It is characterized by craniosynostosis, midface hypoplasia with choanal stenosis and atresia, radiohumeral synostosis and femoral bowing. This is sometimes accompanied by cardiac, renal, gastrointestinal and genital malformations. The risk of respiratory distress is high in the infants with this syndrome, and this is most commonly caused by choanal stenosis and atresia. Careful anesthetic management is needed for these infants because of the potential risk of a difficult airway and respiratory complications. We report here on our experience with the anesthetic management of a neonate with Antley-Bixler syndrome and we review the relevant literature.