Burst-suppression anesthesia (BSA) has been previously compared with electroconvulsive therapy (ECT) in drug-resistant depression, with promising results. We have carried out a double-blind randomized clinical trial comparing BSA with sham-BSA in 20 patients meeting DSM-IV criteria for major depression with inadequate response to antidepressant drugs and who chose BSA as an alternative to ECT. After withdrawing antidepressant drugs, patients were randomized to receive four sessions of either BSA (induction with propofol followed by the anesthetic agent sevoflurane, achieving BSA for 1 hour) or sham-BSA (induction with propofol until loss of consciousness, followed by spontaneous awakening in 5-10 minutes). Decrease in the Hamilton Rating Depression Scale was larger with BSA (-6.0 +/- 7.3) than with sham-BSA (-2.5 +/- 4.5), but differences did not reach statistical significance ( t = -1.08, p = 0.3). In our sample, we have not found BSA to be superior to sham-BSA and therefore cannot consider BSA as an alternative to ECT.
Patients' waiting time at the clinic dropped. The number of «unavoidable» appointments and interruptions was reduced. Patients´ satisfaction improved with the time they had to wait at the clinic improved. The corrective measures introduced are the right ones for correcting the situation.
Se evaluó el desempeño de la influencia de la ceniza de bagazo de caña (CBC) como filler en mezclas de concreto autocompactante (CAC), adicionado en un 0%, 5%, 10%, 15%, 20% y 25% con respecto al peso de cemento. La caracterización de la ceniza se realizó mediante FTIR, FRX y DRX. Las propiedades de trabajabilidad del CAC fueron determinadas mediante ensayos de flujo de asentamiento, anillo J, caja en L, embudo V, Índice de Estabilidad Visual y resistencia a la compresión. De acuerdo con los resultados, los porcentajes de 10 al 20% en las mezclas de CAC obtuvieron un desempeño satisfactorio, evidenciando parámetros de trabajabilidad y resistencia a la compresión sobresalientes comparados con trabajos similares a los publicados en la literatura.
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