Why the study?
Does levobupivacaine compared to bupivacaine affect QT, QTc, and P wave dispersion durations in parturients undergoing elective cesarean section?
Does levobupivacaine compared to bupivacaine affect QT, QTc, and P wave dispersion durations in parturients undergoing elective cesarean section?
Both agents yield comparable QT/QTc and P-wave dispersion; supports interchangeable spinal use in cesarean without differential conduction risk.
In our study we aimed to investigate the effect of bupivacaine and levobupivacaine on QT, corrected QT (QTc), and P wave dispersion durations during spinal anesthesia in cesarean section. Sixty parturients scheduled for elective cesarean section in ASA I-II risk groups were included in the study. Baseline electrocardiographic (ECG) records of the patients were obtained in the operation room. Heart rate (HR), non-invasive blood pressure (NIBP), peripheral oxygen saturation (SpO2) and respiration rates (RR) were recorded. Venous cannulation was performed with 18 G cannula and fl uid preload made with 10 mL.kg-1. Lactated Ringer solution. After fl uid preload, second ECG recordings were taken and the patients were randomly separated into two groups. Group B (n = 30) received 10 mg of bupivacaine and Group L (n = 30) received 10 mg of levobupivacaine for spinal anesthesia. ECG recordings were repeated at 1, 5 and 10 minutes after spinal block. HR, NIBP, SpO2 , RR and sensory block levels were also recorded at the same time intervals. At predetermined time intervals of spinal anesthesia, P wave dispersion (Pwd), QT dispersion (QTd), and QTc dispersion (QTcd) durations were measured from ECG records. QT and QTc durations are calculated with Bazzett formula Nosso estudo teve como objetivo investigar o efeito de bupivacaína e levobupivacaína na duração das dispersões do QT, QT corrigido (QTc) e da onda P durante raquianestesia em cesariana. Sessenta parturientes programadas para cesariana eletiva ASA I-II foram incluídas no estudo. Exames eletrocardiográfi cos (ECG) foram feitos após a entrada das pacientes na sala de operação. Frequência cardíaca (FC), pressão arterial não invasiva (PANI), saturação periférica de oxigênio (SpO2) e frequência respiratória (RR) foram registradas. Para o acesso venoso, uma cânula de calibre 18G foi usada. A pré-carga de líquidos foi feita com solução de Ringer com lactato (10 mL.kg-1). Após a pré-carga de líquidos, um segundo exame eletrocardiográfi co foi feito e as pacientes foram designadas aleatoriamente para dois grupos. O Grupo B (n = 30) recebeu 10 mg de bupivacaína e o Grupo L (n = 30) recebeu 10 mg de levobupivacaína para raquianestesia. Exames ECG foram repetidos nos minutos um, cinco e 10 após a anestesia. FC, PANI, SpO2, FR e os níveis de bloqueio sensorial também foram registrados nos mesmos intervalos de tempo. Em intervalos de tempo pré-determinados de raquianestesia, as durações da dispersão da onda P (OPd), QT (QTd) e QTc (QTcd) foram medidas a partir dos registros do ECG. As durações de QT e QTc foram calculadas com a fórmula de Bazzett.
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Deniz et al. (2013) studied this question.
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