Frequency of BRAF V600E Mutation in the Mexican Population of Patients With Metastatic Melanoma.

PURPOSE: The BRAF V600E mutation has been described in melanomas occurring in the Caucasian, European, and Asian populations. However, in the Mexican population, the status and clinical significance of BRAF mutation has not been researched on a large scale. METHODS: Consecutive BRAF-tested Mexican patients with metastatic melanoma (n = 127) were analyzed for mutations in exon 15 of the BRAF gene in genomic DNA by real-time polymerase chain reaction technology for amplification and detection. The results were correlated with the clinical-pathologic features and the prognosis of the patients. RESULTS: The frequency of somatic mutation V600E within the BRAF gene was 54.6% (43 of 127 patients). Nodular melanoma was the most prevalent subtype in our population, with BRAF mutations in 37.2% (16 of 55 patients). In contrast, superficial spread had a frequency of 18.6% BRAF mutation (eight of 24). Other clinicopathologic features were assessed to correlate with the mutation status. CONCLUSION: This study searched for the most prevalent BRAF V600E mutation type in melanoma in a heterogeneous population from Mexico. Nodular melanoma was found to be the most prevalent in metastatic presentation and the presence of BRAF V600E mutation, perhaps related to the mixed ancestry; in the north, ancestry is predominantly European and in the south, it is predominantly Asian. The outcomes of the mutation correlations were similar to those found in other populations.

Comparison of 2 laryngeal tracheal anesthesia techniques in reducing emergence phenomena.

Endotracheal intubation (ETT) can cause emergence phenomena (EP) including coughing, sore throat, and dysphonia. Two methods used to prevent EP are the administration of local anesthetics directly onto airway structures using a specialized laryngotracheal instillation of topical anesthesia (LITA) tube (Sheridan Catheter Corporation, Argyle, New York) or the placement of a local anesthetic into the ETT cuff. The purpose of this study was to determine which method was better at preventing ERl In this prospective, randomized, comparative analysis, a sample of 160 ASA class I through III patients were randomly assigned to receive their EP prophylaxes either by placement of alkalinized lidocaine directly into the ETT cuff at intubation or by injection into a specialized port on the LITA tube approximately 30 minutes before extubation. Variables measured included the incidence and severity of sore throat, coughing, and dysphonia for the first 24 hours following surgery. The incidence of cough and sore throat was higher in the LITA group, achieving significance in the postanesthesia care unit and after discharge to home. No difference in any of the other variables was noted between groups. Our study demonstrated greater efficacy in decreasing the incidence and severity of EP by placing an alkalinized solution of lidocaine into the ETT cuff on intubation.