Search

Introduction: Previous studies have shown that women have poorer neurological outcomes than men following out-of-hospital cardiac arrest (OHCA). However, those studies focused on survival, a measure that may be confounded by withdrawal of life-sustaining therapy (WLST) decisions. We sought to assess sex differences in severe cerebral edema development following cardiac arrest. Methods: Data from adult OHCA patients presenting between 2007-2019 were retrospectively analyzed. Patients with multiple concomitant acute neurologic dysfunctions were excluded. Severe cerebral edema was classified as herniation or more than minimal ventricular effacement in MRI or CT radiology reports. Arrest types were categorized as shockable (VT/VF) or non-shockable (PEA, asystole). Poor outcomes were defined as Cerebral Performance Category > 3 at discharge. Multivariable backward stepwise logistic regression was performed. Results: 359 patients met our inclusion criteria. Demographics, imaging and clinical outcomes are summarized in Table 1. Women were more likely than men to have a non-shockable initial rhythm (P=0.003) and develop severe cerebral edema (P=0.005). Backwards stepwise logistic regression of an initial model including age, sex, rhythm, witnessed arrest and TTM-treatment, produced a final model that showed younger age (P Conclusion: For OHCA patients who are initially comatose, women are more likely than men to have non-shockable rhythms and severe cerebral brain edema. These differences may be responsible for the poorer discharge outcomes that have been observed by other studies.

Introduction: The incidence of substance-related cardiac arrests (SRCA) has increased due to the opioid epidemic. Previous studies have shown that SRCA present differently than non-SRCA. Weinvestigated differences in the clinical courses between the two groups for patients who were initially comatose post-resuscitation. Methods: Data from out-of-hospital arrest patients seen between 2007-2019 were retrospectively analyzed. Arrests were classified as SRCA if the patient had a positive toxicology screen, witnesses testified to substance use, or drug paraphernalia was present at the scene. Arrest types were categorized as shockable or non-shockable. Cerebral edema classifications were based on MRI or CT radiology reports. Poor outcomes were defined as Cerebral Performance Category (CPC) > 3 at discharge. Differences in demographics, presentation and outcomes were compared (Fisher’s Exact Test or Exact Wilcoxon-Mann-Whitney). Multivariable backward stepwise logistic regression was performed. Results: SRCA patients (N=90) were younger (p Discussion: SRCA patients are more likely to have non-shockable arrests which in turn leads to cerebral edema development and potentially worse outcomes.

Background: For cardiac arrest survivors who are initially comatose after restoration of spontaneous circulation, the extent of brain injury and expected recovery are crucial for management decisions. Advanced diffusion imaging approaches may provide additional insight into microstructural integrity and potential for arousal recovery (AR). Methods: Multi-shell diffusion imaging was acquired in a prospective study. Neurite orientation dispersion (OD), intracellular volume fraction (ICVF), free water fraction (ISO), mean kurtosis (MK), axial kurtosis (AK), radial kurtosis (RK), mean diffusivity (MD), axial diffusivity (AD), radial diffusivity (RD) and fractional anisotropy (FA) were calculated (see Figure). Median whole-brain values in patients with AR by discharge were compared with those with no AR and to controls (ANOVA, post-hoc 2-tailed Wilcoxon test). Multivariable backward stepwise logistic regression was performed to predict AR. Results: 19 patients (mean ±SD 48±23 y, 42% men) and 5 controls (37±19 y, 40% men) were analyzed (10 patients with AR, 9 without). Median [IQR] time-to-MRI was 5 [4-8] days. Patients with no AR had higher AK (P=0.037), and RK (P=.045) than those with AR. Controls exhibited higher FA than either AR (P=.009) or no AR (P=.02), lower MK than no AR (P=.02), lower AK than no AR (P=.02), lower RK than no AR (P=0.02), lower OD than no AR (P=.008), and lower ICVF than no AR (P=.046). AK (P=.049) and ICVF (P=.01) were found in multivariable regression to be significant predictors of AR with 81% area under the receiver operating curve (AUC). Discussion: Advanced diffusion imaging metrics, AK and ICVF, were able to predict which patients were likely to regain consciousness, with 81% AUC. Despite the small sample size, we note statistically significant differences using more sensitive measures of microstructural injury compared to more commonly used diffusivity metrics. Further investigation of advanced diffusion imaging methods is warranted.