Preexisting anticoagulation is an independent predictor of mortality in geriatric trauma patients - a retrospective cohort study.

Introduction: Preexisting anticoagulation is common among geriatric trauma patients. Geriatric trauma patients have a higher risk of mortality compared to younger patients. We sought to evaluate the association of preexisting anticoagulation with mortality in a group of geriatric trauma patients. Methods: A retrospective review of geriatric trauma patients was conducted for those admitted to a Level 1 trauma center from January 2018 to December 2020. Vital signs, demographics, injury characteristics, laboratory data, and mortality were all collected. Multivariable logistic regression analysis was performed for the association of preexisting anticoagulation and a primary endpoint of all-cause mortality. These groups were controlled for preexisting comorbidities, injury severity scores, and systolic blood pressure in the emergency department. Results: Four thousand four hundred thirty-two geriatric patients were admitted during the study period. This cohort was made up of 36.9% men and 63.1% women. Three thousand eight hundred fifty-nine (87.2%) were white; the average age was 81±8.5 years, and the median injury severity score (ISS) was 5. The mean systolic blood pressure was 150±32 mmHg, mean heart rate was 81±16 bpm, mean lactate was 2.3±1.3, mean hematocrit was 37.3±8.8, and mean international normalized ratio (INR) was 1.7±10.3. One thousand five hundred ninety-two (35.9%) patients were on anticoagulation (AC) upon presentation. One hundred and sixty-five (3.7%) mortalities were recorded. Multivariable logistic regression analysis results show that preexisting anticoagulation [ odds ratio (OR) 1.92, 95% CI 1.36-2.72] was independently predictive of death. The analysis was adjusted for systolic BP in the emergency department less than90 mmHg (OR 5.55, 95% CI 2.83-10.9), having more than 1 comorbidity (OR 2.30, 95% CI 1.57-3.38) and ISS (OR 1.13, 95% CI 1.10-1.15). Conclusion: Our study indicates that preexisting anticoagulation is associated with mortality among geriatric trauma patients.

Management of aortic occlusion in a morbidly obese smoker: A case report.

Total occlusion of the abdominal aorta is a rare and life-threatening event. Risk factors most commonly include coagulopathy, vasculitis, trauma, abdominal aortic aneurysms, aortic thromboembolism, and aortic dissection. The most common complications include severe ischemic manifestations in the lower extremities, spinal cord, or viscera. Thus, management is largely dependent on presumed etiology. We present a case of a morbidly obese 52-year-old female with a past medical history of hypertension, diabetes mellitus, peripheral vascular disease, and coronary artery disease with a smoking history of three packs per day for over 10 years. The patient first presented to our emergency department with bilateral lower extremity paresthesia and pain at rest. Further evaluation through computed tomography angiogram thus revealed infrarenal occlusion of the abdominal aorta and bilateral common iliac arteries; the patient was treated with an aorto-femoral bypass without further sequelae. Our case report details the associated risk factors of acute on chronic aortic occlusion and its management.

Epidural electrical stimulation of the cervical spinal cord opposes opioid-induced respiratory depression.

Opioid overdose suppresses brainstem respiratory circuits, causes apnoea and may result in death. Epidural electrical stimulation (EES) at the cervical spinal cord facilitated motor activity in rodents and humans, and we hypothesized that EES of the cervical spinal cord could antagonize opioid-induced respiratory depression in humans. Eighteen patients requiring surgical access to the dorsal surface of the spinal cord between C2 and C7 received EES or sham stimulation for up to 90 s at 5 or 30 Hz during complete (OFF-State) or partial suppression (ON-State) of respiration induced by remifentanil. During the ON-State, 30 Hz EES at C4 and 5 Hz EES at C3/4 increased tidal volume and decreased the end-tidal carbon dioxide level compared to pre-stimulation control levels. EES of 5 Hz at C5 and C7 increased respiratory frequency compared to pre-stimulation control levels. In the OFF-State, 30 Hz cervical EES at C3/4 terminated apnoea and induced rhythmic breathing. In cadaveric tissue obtained from a brain bank, more neurons expressed both the neurokinin 1 receptor (NK1R) and somatostatin (SST) in the cervical spinal levels responsive to EES (C3/4, C6 and C7) compared to a region non-responsive to EES (C2). Thus, the capacity of cervical EES to oppose opioid depression of respiration may be mediated by NK1R+/SST+ neurons in the dorsal cervical spinal cord. This study provides proof of principle that cervical EES may provide a novel therapeutic approach to augment respiratory activity when the neural function of the central respiratory circuits is compromised by opioids or other pathological conditions. KEY POINTS: Epidural electrical stimulation (EES) using an implanted spinal cord stimulator (SCS) is an FDA-approved method to manage chronic pain. We tested the hypothesis that cervical EES facilitates respiration during administration of opioids in 18 human subjects who were treated with low-dose remifentanil that suppressed respiration (ON-State) or high-dose remifentanil that completely inhibited breathing (OFF-State) during the course of cervical surgery. Dorsal cervical EES of the spinal cord augmented the respiratory tidal volume or increased the respiratory frequency, and the response to EES varied as a function of the stimulation frequency (5 or 30 Hz) and the cervical level stimulated (C2-C7). Short, continuous cervical EES restored a cyclic breathing pattern (eupnoea) in the OFF-State, suggesting that cervical EES reversed the opioid-induced respiratory depression. These findings add to our understanding of respiratory pattern modulation and suggest a novel mechanism to oppose the respiratory depression caused by opioids.

Proteome-wide analysis of a malaria vaccine study reveals personalized humoral immune profiles in Tanzanian adults.

Tanzanian adult male volunteers were immunized by direct venous inoculation with radiation-attenuated, aseptic, purified, cryopreserved Plasmodium falciparum (Pf) sporozoites (PfSPZ Vaccine) and protective efficacy assessed by homologous controlled human malaria infection (CHMI). Serum immunoglobulin G (IgG) responses were analyzed longitudinally using a Pf protein microarray covering 91% of the proteome, providing first insights into naturally acquired and PfSPZ Vaccine-induced whole parasite antibody profiles in malaria pre-exposed Africans. Immunoreactivity was identified against 2239 functionally diverse Pf proteins, showing a wide breadth of humoral response. Antibody-based immune 'fingerprints' in these individuals indicated a strong person-specific immune response at baseline, with little changes in the overall humoral immunoreactivity pattern measured after immunization. The moderate increase in immunogenicity following immunization and the extensive and variable breadth of humoral immune response observed in the volunteers at baseline suggest that pre-exposure reduces vaccine-induced antigen reactivity in unanticipated ways.