Perioperative Variation in Optic Nerve Sheath Diameter - A Prospective Observational Study of Traumatic Brain Injury Patients Undergoing Decompressive Craniectomy.

Background: Measuring optic nerve sheath diameter (ONSD) by transbulbar ultrasonography (TBUS) can suffice non-invasive ICP measurement with considerable accuracy. Objective: The primary objective of this study was to evaluate the perioperative variation in ONSD by TBUS in Traumatic Brain Injury (TBI) patients undergoing emergency craniectomy. Methods: We prospectively compared bilateral ONSD measurements in 45 consecutive TBI cases undergoing decompressive craniectomy under general anesthesia; before and after surgery. A total of 180 ONSD images were obtained and measurements were done by the same investigator blinded to the pre/postoperative nature of the image. Results: Based on preoperative Glasgow Coma Scores, 34 cases (75.5%) had severe TBI; 10 cases (22.2%) moderate TBI; and 1 case (2.2%) mild TBI. Preoperative ONSD in the study population were as 6.625 ± 0.414mm. Average ONSD reduced significantly by 0.249 ± 0.148 mm (P < 0.001) after craniectomy. On pooled analysis of cases undergoing right versus left sided craniectomy average ONSD reduced significantly by 0.252 ± 0.173 mm (P < 0.001) and 0.259 ± 0.139 mm (P < 0.001), respectively. ONSD of right eye with left eye and vice-versa were strongly correlated both pre/postoperatively with Pearson correlation coefficients (r)=0.879 (P < 0.001) and r = 0.827 (P < 0.001), respectively. Conclusions: In TBI cases undergoing decompressive craniectomy ONSD is bilaterally increased preoperatively. ONSD reduces significantly immediately after craniectomy; however, the diameters did not near the normal range. There hold a strong correlation between right/left ONSD measurements irrespective of the laterality of injury or side of surgery. Variable elastic properties of ONS in an injured brain can possibly explain our findings.

Implementation and adherence to a speciality-specific checklist for neurosurgery and its influence on patient safety.

BACKGROUND AND AIMS: Neurosurgery involves a high level of expertise coupled with enduring and long duration of working hours. There is a paucity of published literature about the experience with a speciality-specific checklist in neurosurgery. We conducted a cross-sectional observational study to identify the adherence to various elements of the Modified World Health Organization Surgical Safety Checklist (WHO SSC) for neurosurgery by the operating room (OR) team. METHODS: We implemented an intra-operative Modified WHO SSC consisting of 40 tools for neurosurgery, in 200 consecutive elective cases. Trained anaesthesiologists assumed the role of checklist co-ordinator. The checklist divided the surgery into 5 phases, each corresponding to a specific time-period. The adherence rates to various tools were evaluated and areas where the checklist prompted a corrective measure were analysed. RESULTS: A total of 131 cases undergoing craniotomy and 69 cases undergoing spine surgery were studied. With the 40-point modified SSC applied in 200 cases, we analysed a total of 8000 observations. The modified checklist prompted the OR team to adhere to speciality-specific safety practices about application of compression stockings (9.5%); airway precautions in unstable cervical spine (2.5%); precautions for treatment of raised intracranial pressure (10.5%); and intraoperative neuro-monitoring (5%). CONCLUSION: The implementation of Modified WHO SSC for Neurosurgery, by a designated checklist co-ordinator, can rectify anaesthetic and surgical facets promptly, without increasing the OR time. The anaesthesiologist as SSC coordinator can effectively implement an intraoperative checklist ensuring excellent participation of operating room team members.