This non-invasive dimensionless score index -SPI-reflects the Patients' sympathetic response to surgical stimulation. Its effectiveness in detecting the balance between nociceptor activation and analgesia was not only reported but also, was reported to be superior to the other parameters like blood pressure and heart rate. SPI value is correlated to pain and ranges from 0 to 100, higher values indicate strong surgical stimulus. Its value is obtained from photoplethysmographic amplitude (PPGA) and heart rate (HR) data from pulse oximetry measurement. Prediction of the severity of postoperative pain using SPI in both adults and children has been reported by several studies. So, the authors hypothesize that dexmedetomidine infusion without giving a bolus dose may affect the SPI in pediatrics undergoing hypospadias repair.
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Surgical pleth index number
Timeframe: 1 minute at end of the operation after skin closure.