Preoperative fasting for the infusion of "yerba mate": a randomized clinical trial with ultrasound evaluation of gastric contents

Abstract Background The traditional infusion of "yerba mate" is widely consumed in South America and exported to countries around the world. Although generally considered a "clear fluid", there is no data to date on the gastric emptying time of yerba mate and safe preoperative fasting intervals. The objective of this study was to evaluate the gastric emptying time of a standardized infusion of yerba mate using bedside ultrasound and compare it with the time confirm of hot and cold tea. Methods This was a prospective, randomized crossover experimental study. Thirty healthy volunteers were evaluated after 8 hours of fasting for both fluids and solids. Gastric antral area and gastric volume were evaluated at baseline and every 20 minutes after drinking 300 mL of randomly assigned infusion of "yerba mate", hot tea, or cold tea. Results The mean gastric emptying time was: 69.7 ± 22.1 min, 63.1 ± 14.5 min, and 64.3 ± 23.5 min for the mate, hot tea, and cold tea respectively. No significant differences were found in emptying time among the infusion groups (p-value = 0.043). When same time measures were compared, the only significant difference detected was between hot teas and mate infusion at 20 minutes (p-value = 0.012) Conclusion Yerba mate infusion has a similar gastric emptying time to that of tea. All subject's gastric volume returned to baseline values by 100 minutes. It is reasonable to recommend a similar fasting period of 2 hours for mate infusion prior to elective surgery.

Cirugía con despertar operatorio para procesos expansivos cerebrales. Reporte de 20 casos

Resumen: Introducción: La cirugía de lesiones expansivas cerebrales con paciente despierto es una técnica que se usa de forma cada vez más frecuente. Esto se debe a que es una técnica costo efectiva para realizar resección de tumores cerebrales de forma amplia y segura. Resultado: Se presentan 20 pacientes operados con dicha técnica. Se trató de 13 hombres y 7 mujeres, rango etario 16 - 67 años, portadores de 17 lesiones tumorales y 3 lesiones vasculares (angiomas cavernosos). Se realizaron 22 cirugías ya que dos pacientes se intervinieron 2 veces. Se logró resección supra-máxima en 3 casos, completa en 9, subtotal en 5 y parcial en 2 pacientes. Un paciente no se pudo operar debido a que presentó un despertar inadecuado y el procedimiento se suspendió. En cuanto a las complicaciones, 18% de los pacientes presentaron crisis intra-operatorias, pero las mismas no impidieron el desarrolló del procedimiento con normalidad luego de yugulada la crisis. Dos pacientes (9% de los procedimientos) presentaron un despertar inadecuado. En un caso la lesión se resecó completamente de todas formas, en el otro se suspendió el procedimiento. 18% de los pacientes presentaron una peoría funcional transitoria y un 4.5% presentó una peoría definitiva (paresia severa). Un solo paciente (4.5%) presentó una infección del colgajo que requirió retiro de la plaqueta ósea y colocación de una placa de acrílico en diferido. Conclusiones: Las cifras presentadas por los autores están en concordancia con las de los centros regionales e internacionales de referencia.

Abstract: Introduction: Expansive brain injury surgery with awake patients is a technique that is being used more and more frequently. This is because it is a cost-effective technique for performing brain tumor resection widely and safely. Outcome: Twenty patients operated with this technique are presented. There were 13 men and 7 women, age range 16 - 67 years, carriers of 17 tumor lesions and 3 vascular lesions (cavernous angiomas). 22 surgeries were performed since two patients underwent surgery twice. Supra-maximal resection was achieved in 3 cases, complete in 9, subtotal in 5, and partial in 2 patients. One patient could not be operated on due to inadequate awakening and the procedure was suspended. Regarding complications, 18% of the patients presented intra-operative seizures, but they did not prevent the normal development of the procedure after the crisis was jugulated. Two patients (9% of the procedures) had inadequate awakening. In one case the lesion was completely resected anyway, in the other the procedure was suspended. 18% of the patients presented a transitory functional deterioration and 4.5% presented a definitive worsening (severe paresis). Only one patient (4.5%) had a flap infection that required removal of the bone plate and placement of a delayed acrylic plate. Conclusions: The figures presented by the authors are in accordance with those of the regional and international reference centers.

Resumo: Introdução: A cirurgia de lesão cerebral extensiva com pacientes acordados é uma técnica cada vez mais utilizada. Isso ocorre porque é uma técnica econômica para realizar a ressecção de tumor cerebral de forma ampla e segura. Resultado: São apresentados 20 pacientes operados com essa técnica. Eram 13 homens e 7 mulheres, com idades entre 16 e 67 anos, portadores de 17 lesões tumorais e 3 lesões vasculares (angiomas cavernosos). Foram realizadas 22 cirurgias, pois dois pacientes foram operados duas vezes. A ressecção supra-máxima foi alcançada em 3 casos, completa em 9, subtotal em 5 e parcial em 2 pacientes. Um paciente não pôde ser operado devido ao despertar inadequado e o procedimento foi suspenso. Em relação às complicações, 18% dos pacientes apresentaram convulsões no intra-operatório, mas não impediram o desenvolvimento normal do procedimento após a jugulação da crise. Dois pacientes (9% dos procedimentos) tiveram despertar inadequado. Em um caso a lesão foi totalmente ressecada de qualquer maneira, no outro o procedimento foi suspenso. 18% dos pacientes apresentaram uma deterioração funcional transitória e 4,5% apresentaram piora definitiva (paresia grave). Apenas um paciente (4,5%) apresentou infecção do retalho que exigiu a retirada da placa óssea e colocação de placa acrílica retardada. Conclusões: Os números apresentados pelos autores estão de acordo com os dos centros de referência regionais e internacionais.