Microbiologic and Clinical Description of Postoperative Central Nervous System Infection After Endoscopic Endonasal Surgery.

BACKGROUND: Consensus guidelines for antibiotic prophylaxis in endoscopic endonasal surgery (EES) have not been developed. The study objective was to define the microbiologic and clinical characteristics of post-EES central nervous system (CNS) infections. METHODS: This was a single-center retrospective study of patients >18 years of age who underwent EES between January 2010 and July 2021 at a high-volume skull base center. Patients with confirmed CNS infection within 30 days of EES were included. During the study period, the standard prophylaxis regimen was ceftriaxone 2 g every 12 hours for 48 hours. For patients with a documented penicillin allergy, vancomycin plus aztreonam was recommended. RESULTS: In total, 2440 EES procedures were performed on 2005 patients; the CNS infection rate was 1.8% (37/2005). CNS infections were more common among patients with a history of previous EES (6.5%; 20/307) compared with those who did not (1%; 17/1698; P < 0.001). The median time from EES to CNS infection was 12 (6-19) days. Thirty-two percent (12/37) of CNS infections were polymicrobic, which was more common among patients without previous EES (52.9%; 9/17) compared with those with previous EES (15%; 3/20; P = 0.03). Across all cases, Staphylococcus aureus (n = 10) and Pseudomonas aeruginosa (n = 8) were commonly isolated pathogens. Among those with confirmed methicillin-resistant Staphylococcus aureus (MRSA) nares colonization before EES, 75% (3/4) developed MRSA CNS infections compared with 6.1% (2/33) of noncolonized patients (P = 0.005). CONCLUSIONS: CNS infection after EES is rare and causative pathogens vary. Further studies are needed to identify the impact of MRSA nares screening on antimicrobial prophylaxis before EES.

Off-Label Use of Intravenous Olanzapine for Agitation After Neurologic Injury.

Background: Small studies have described the off-label use of intravenous (IV) olanzapine for the management of acute agitation. Objective: The purpose of this study was to evaluate the efficacy and safety of IV olanzapine to manage acutely agitated patients with neurological injuries. Methods: This was a retrospective analysis of IV olanzapine use in patients admitted to the neurotrauma and neurovascular intensive care units at a single academic center. The primary endpoint was the requirement of additional IV olanzapine, IV benzodiazepine, or IV haloperidol within 60 minutes from the time of first IV olanzapine dose. Secondary safety endpoints included QTc prolongation and respiratory depression. Results: Forty-six patients received IV olanzapine during the study period. One patient required an additional dose of IV olanzapine and two patients received benzodiazepine or antipsychotic agents within 60 minutes of IV olanzapine administration. One patient had a post-administration QTc level >500 ms. Two patients had an increased oxygen requirement, but none required intubation. Conclusion: IV olanzapine appears to be efficacious in reducing the need for sedatives and antipsychotics with low risk for QTc prolongation and respiratory depression in acutely agitated patients with neurological injuries.

Impact of benzodiazepines on time to awakening in post cardiac arrest patients.

AIM: Although guidelines recommend use of short acting sedation after cardiac arrest, there is significant practice variation. We examined whether benzodiazepine use is associated with delayed awakening in this population. METHODS: We performed a retrospective single center study including comatose patients treated after in- or out-of-hospital cardiac arrest from January 2010 to September 2019. We excluded patients who awakened within 6 h of arrest, those who arrested due to trauma or neurological event, those with nonsurvivable primary brain injury and those with refractory shock. Our primary exposure of interest was high-dose benzodiazepine (>10 mg of midazolam equivalents per day) administration in the first 72-h post arrest. Our primary outcome was time to awakening. We used Cox regression to test for an independent association between exposure and outcome after controlling for biologically plausible covariates. RESULTS: Overall, 2778 patients presented during the study period, 621 met inclusion criteria and 209 (34%) awakened after a median of 4 [IQR 3-7] days. Patients who received high-dose benzodiazepines awakened later than those who did not (5 [IQR 3-11] vs. 3 [IQR 3-6] days, P = 0.004). In adjusted regression, high-dose benzodiazepine exposure was independently associated with delayed awakening (adjusted hazard ratio 0.63 (95% CI 0.43-0.92)). Length of stay, awakening to discharge, and duration of mechanical ventilation were similar across groups. CONCLUSION: High-dose benzodiazepine exposure is independently associated with delayed awakening in comatose survivors of cardiac arrest.

Safety and Efficacy of Warfarin Reversal with Four-Factor Prothrombin Complex Concentrate for Subtherapeutic INR in Intracerebral Hemorrhage.

BACKGROUND: The use of vitamin K antagonists is an independent risk factor for the development of intracerebral hemorrhage (ICH). Four-factor prothrombin complex concentrate (4F-PCC) is recommended for urgent reversal of anticoagulation in this setting. The safety and efficacy of 4F-PCC in ICH with subtherapeutic levels of anticoagulation is yet to be determined. METHODS: This was a retrospective, observational study of 4F-PCC administration data from September 2013 to July 2015. Patients with spontaneous or traumatic ICH with initial INR 1.4-1.9 were compared to those with INR 2-3.9. A Fisher's exact test was used to compare the difference between the two groups in the effectiveness of 4F-PCC in reversing the INR to ≤1.3 and in the occurrence of thrombotic events within 7 days of administration. RESULTS: A total of 131 patients with a presenting INR between 1.4 and 3.9 received 4F-PCC during the study period. Twenty-three of 29 patients (79 %) in the INR <2 group achieved an INR reduction to ≤1.3 after 4F-PCC administration compared to 47 of 92 patients (51 %) in the INR 2-4 group, p = 0.03. There was no difference in thrombotic complications within 7 days after administration (6.7 % in INR 1.4-1.9 group, 10 % in INR 2-3.9 group, p = 0.73). CONCLUSION: The use of 4F-PCC in patients with INR between 1.4 and 1.9 results in an effective reduction in INR with similar thrombotic risks compared to patients presenting with an INR of 2-3.9.