Prevention of Oculocardiac Reflex by Premedication With Low Dose I/V Ketamine during Strabismus Surgery

Background: OCR commonly occurs during strabismus surgery, producing bradycardia, arrhythmias and even cardiac arrest after manipulation of orbital structures. Ketamine is NMDA receptor antagonist and acts as an analgesic. Aim: To determine the effect of ketamine premedication on prevention of OCR during strabismus surgery. Study design: Randomized control trial Methodology: 60 patients were randomly divided into two groups i.e., Ketamine 0.75mg/kg (Group K) and control (Group C). Group K patients were premedicated with 0.75mg/kg ketamine while Group C patients did not receive any premedication. Heart rate and ECG were observed 30 sec before and continuously after traction on extraocular muscles was applied upto end of surgery for bradycardia and arrhythmias. Percentage change in HR and presence of arrhythmias was documented. All the data was collected using case report form and analyzed using SPSS version 15. Results: In Group C, 15(50%) cases had arrhythmias while in Group K, only 4(13.33%) cases had arrhythmias. Mean HR in Group C was 118.77±6.92/min and in Group K was 101.57±15.65/min. In Group C, oculocardiac reflex was present in 23(76.7%) cases and in Group K, OCR was present in 6 (20%) cases and prevented in 24 (80%) cases. Conclusion: Premedication with 0.75mg/kg IV ketamine significantly reduces the occurrence of oculocardiac reflex during strabismus surgery. Keywords: Ketamine, Oculocardiac Reflex, Premedication, Prevention, Strabismus

Comparing General Anesthesia with Preemptive IV Atropine vs General Anesthesia with Single Injection Peribulbar Block with Levobupivacaine 0.5% or Lidocaine 2% for Prevention of Oculocardiac Reflex in Children Undergoing Strabismus Surgery: Randomized Control Study

Background Strabismus is one of the common health problems among the children. The incidence of the oculocardiac reflex decreases with age and tends to be more pronounced in young, healthy patients, which is clinically significant for pediatric as it is observed with greatest incidence in young healthy neonates and infants undergoing strabismus surgery. Objective to prevent and attenuate the oculocardiac reflex in children age group from (2yrs to 14 yrs) undergoing surgical correction for strabismus. Patients and Methods Three groups were allocated Group C received general anaesthesia combined with pre emptive atropine, Group L received general anaesthesia combined with Peribulbar block with Lidocaine 2 % and Group LB which received general anaesthesia combined with peribulbar block with Levobupivacaine 0.5%. Results In Our study we found that group L which received peribulbar lidocaine 2 % was the most successful group regarding blocking the occurrence of the OCR and with acceptable post operative pain control results. Conclusion In Our study the use of peribulbar block with lidocaine 2 % in combinations with General anaesthesia is very effective against the incidence of OCR in children undergoing strabismus surgery and superior to the Iv pre emptive Atropine with higher surgeon satisfaction while the use of peribulbar levobupivacaine 0.5% combined with general anaesthesia has a great role in post operative pain control with superior patient satisfaction, on the other hand the atropine is a very important emergency drug but our study found that it has a very minor role in both preventing the OCR and post operative pain control in addition to subjecting the patients to the tachycardia and other complications like dryness of the mouth and blushing so its not recommended by our study.

Penehyclidine mitigates postoperative nausea and vomiting and intraoperative oculocardiac reflex in patients undergoing strabismus surgery: a prospective, randomized, double-blind comparison

Background Postoperative nausea and vomiting (PONV) is one of the most frequent complications following strabismus surgery. Penehyclidine, an anticholinergic agent, is widely used as premedication. This study investigated the effect of preoperative penehyclidine on PONV in patients undergoing strabismus surgery. Methods In this prospective, randomized, double-blind study, patients scheduled for strabismus surgery under general anesthesia were randomly assigned to either penehyclidine (n = 114) or normal saline (n = 104) group. Penehyclidine was administrated immediately after anesthesia induction, and normal saline was substituted as control. PONV was investigated from 0 to 48 h after surgery. Intraoperative oculocardiac reflex (OCR) was also recorded. Results Compared with normal saline, penehyclidine significantly reduced PONV incidence (30.7% vs. 54.8%, P < 0.01) and mitigated PONV severity as indicated by severity scoring (P < 0.01). Compared with normal saline, penehyclidine also significantly reduced OCR incidence (57.9% vs. 77.9%, P < 0.01) and mitigated OCR severity, as indicated by the requirement for atropine rescue (77.3% vs. 90.1%, P < 0.05) and the maximum decrease of heart rate during OCR (23.1 ± 9.4 bpm vs. 27.3 ± 12.4 bpm, P < 0.05). The recovery course did not differ between groups. Conclusions Penehyclidine administrated after anesthesia induction significantly reduced the incidence of PONV and alleviated intraoperative OCR in patients undergoing strabismus surgery. Trial registration ClinicalTrials.gov (NCT04054479). Retrospectively registered August 13, 2019.