Bispectral Index Monitoring In Pediatric Cataract Surgery: A Comparative Study Using Propofol-Midazolam Versus Sevoflurane Anesthesia

Bispectral Index Monitoring In Pediatric Cataract Surgery: A Comparative Study Using Propofol-Midazolam Versus Sevoflurane Anesthesia

Bispectral Index Monitoring In Pediatric Cataract Surgery: A Comparative Study Using Propofol- Midazolam Versus Sevoflurane Anesthesia

Ocular alignment will be studied in children having cataract surgery that will be divided into two groups, one group will be anesthetized using sevoflurane anesthesia (group A), and the other will be anesthetized by midazolam bolus and propofol infusion (total intravenous anesthesia, TIVA) (group B). in both groups depth of anesthesia will be monitored by bispectral index monitor.

After signing the informed consent by children parent, child will be transferred to the operating room and will be connected to pulse oximetry, non invasive blood pressure and electrocardiogram(ECG), child will be anesthetized by sevoflurane 8% for cannula insertion, then in Group A, sevoflurane will be continued with 2%, and iv atracurium 0.25mg/kg, and paracetamol 15mg/kg iv will be given. In group B, sevoflurane will be discontinued and propofol bolus1mg/kg iv, midazolam 0.05 mg/kg iv, atracurium 0.25 iv, and paracetamol 15mg/kg iv then propofol infusion will start immediately according to McFarlan protocol for manual syringe pump for pediatrics. For first 10 minutes 15mg/kg, second 10 minutes 13mg/kg, third 10 minutes 13mg/kg, fourth 10 minutes 11mg/kg, fifth 10 minutes 11mg/kg, and will be continued on this rate for the end of surgery. Bispectral index monitor(Covidien, Germany) will be attached to child forehead after cleansing it with alcohol 70%. after adequate jaw relaxation , trachea will be intubated with adequate size endotracheal tube and attached to anesthesia machine ( General electric, Carestation 650).Volume controlled ventilation (VCV) will start with tidal volume(VT) 6-8 ml/kg, respiratory rate (RR)16-20 according to end-tidal carbon dioxide (CO2)35-40mmhg. Flow of fresh gas rate 2 l/minute. standard circuit system connection for pediatric will be used. Heart rate ,peripheral oxygen saturation (SPO2), non invasive blood pressure, end-tidal carbon dioxide (ETCO2), and bispectral index monitor will be measured every 5 minutes. 6 ml/kg of ringer will be given infusion slowly.

child will be anesthetized with sevoflurane 2% and atracurium 0.25mg/kg and paracetamol 15mg/kg, then bispectral index will be recorded after intubation and every five minutes till end of surgery. Position of the globe will recorded every five minutes. Angle of deviation of the globe will be calculated via withdrawing horizontal line passing from the lateral and medial canthi, and another vertical one passing the medial canthus(90-0--90 degree). Bis should be 40-65 to ensure adequate depth of anesthesia. If more than 65 or less than 40, sevoflurane concentration will be adjusted till having the target range. pupillary dilation in surgical eye will be assessed after speculum insertion, 20 minutes after speculum insertion, and before speculum removal by pupil ruler((pupil gauge), whether it will be maintained or not (considered maintained if pupil size equal or more than 5mm).

Child will be anesthetized with midazolam 0.05 mg/kg IV bolus and propofol 1mg/kg IV bolus, paracetamol 15mg\kg IV infusion, and atracurium 0.25mg/kg IV bolus ,then anesthesia will be maintained with propofol infusion according to Mcfarlan protocol, then BIS will be recorded after intubation and every five minutes till end of surgery. Position of the globe will recorded every five minutes till the end of surgery. Angle of deviation will be calculated in same way as group A. Bis should be 40-65. If more than 65 or less than 40, sevoflurane concentration will be adjusted till having the target range. pupillary dilation in surgical eye will be assessed after speculum insertion, 20 minutes after speculum insertion, and before speculum removal by pupil ruler((pupil gauge) and will be observed all over the surgery with the help of surgeon feedback whether it will be maintained or not (considered maintained if pupil size equal or more than 5mm).

measuring feasibility of BIS monitor in detecting depth of anesthesia in pediatric population and whether it will be beneficial as a tool for helping anesthesiologist in maintaining central globe alignment

depth of anesthesia will be measured using bispectral index monitor (BIS) monitor and position of the globe will be assessed and related to it by measuring the angle of deviation in degrees. Then, correlation the findings using pearson correlation co-effecient

pupil of surgical eye is dilated with phenylephrine 2.5%. assessing wether pupillary dilatation will be maintained during anesthesia (> or aqual to 5 mm) or not by using pupil gauge.

after insertion of the speculum and will be observed all over the procedure. any change of the pupil size less than 5 mm will be recorded.

Inclusion Criteria: 0-children American society of anesthesiologist (ASA )grade l, ll of both sex 0-congenital or traumatic cataract Exclusion Criteria: 0- syndromes involving cataract. 0- children with neurologic disorders. 0- children on anti-psychotic medication. 0- hypersensitivity to any anesthetic used.

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