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77 result(s) for "Christianson, Thomas"
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Initial antihypertensive agent effects on acute blood pressure after intracerebral haemorrhage
IntroductionCurrent guidelines recommend blood pressure (BP) lowering in patients after acute intracerebral haemorrhage (ICH) without guidance on initial choice of antihypertensive class. This study sought to determine if initial antihypertensive class differentially effects acute BP lowering in a large multiethnic ICH cohort.MethodsSubjects enrolled in the Ethnic/Racial Variations in ICH study between August 2010 and August 2017 with elevated admission BP and who received labetalol, nicardipine or hydralazine monotherapy as initial antihypertensive were analysed. Primary outcomes were systolic and diastolic BP changes from baseline to first BP measurement after initial antihypertensive treatment. Secondary outcomes included haematoma expansion (HE), hospital length of stay (LOS) and modified Rankin Score (mRS) up to 12 months after ICH. Exploratory outcomes assessed effects of race/ethnicity. Linear and logistic regression analyses, adjusted for relevant covariates, were performed to determine associations of antihypertensive class with outcomes.ResultsIn total, 1156 cases were used in analyses. Antihypertensive class was associated with diastolic BP change (p=0.003), but not systolic BP change (p=0.419). Initial dosing with nicardipine lowered acute diastolic BP than labetalol (least square mean difference (labetalol-nicardipine)=5.47 (2.37, 8.57), p<0.001). Initial antihypertensive class was also found to be associated with LOS (p=0.028), but not with HE (p=0.406), mortality (p=0.118), discharge disposition (p=0.083) or mRS score at discharge, 3, 6 and 12 months follow-up (p=0.262, 0.276, 0.152 and 0.36, respectively). Race/ethnicity variably affected multivariable models.ConclusionIn this large acute ICH cohort, initial antihypertensive class was associated with acute diastolic, but not systolic, BP-lowering suggesting differential effects of antihypertensive agents.Trial registration number NCT01202864.
Acute Respiratory Distress Syndrome Associated With Clopidogrel in a Young Male Patient
Clopidogrel is a commonly prescribed antiplatelet drug in patients with stents and histories of arterial vascular disease. It generally has a favorable side effect profile with increasing bleeding risk as the main concern as an adverse event. A 19-year-old previously healthy male presented to the neurological intensive care unit with a subarachnoid hemorrhage requiring a flow diverting stent to secure the aneurysm. The patient was stable for 2 weeks and had no changes to management or medication within 48 h of antiplatelet therapy. Within hours of first-time dosing of clopidogrel, the patient experienced a syncopal episode and dyspnea. He was difficult to arouse and using accessory muscles to breath with an otherwise benign exam. He was hypoxic with bibasilar crackles requiring bilevel positive airway pressure (BiPap). Imaging showed bilateral pulmonary edema and he was diagnosed with moderate acute respiratory distress syndrome (ARDS). Infectious, cardiogenic, and contrast-induced ARDS were ruled out. Upon cessation of clopidogrel, his pulmonary function and mental status improved. This is the first reported case of a young and immunocompetent patient's severe pulmonary edema leading to acute respiratory distress syndrome in association with first- time dosing of clopidogrel.
Pilot Exploratory Analysis of Serum Gonadal Hormones, Inflammatory Proteins, and Intracerebral Hemorrhage Outcomes
Intracerebral hemorrhage (ICH) remains the least treatable form of stroke, with inflammation implicated as a major pathophysiological feature. Hence, this study sought to associate serum proteins and hormones associated with inflammation and ICH outcomes. Patients presenting to Duke University Hospital with computed tomography-verified spontaneous, supratentorial, non-traumatic ICH within 24 h of symptom onset were prospectively recruited. In this pilot study, equal numbers of men and women and Black and White individuals were included and matched by a 6-month modified Rankin Score (mRS). The primary analyses were the correlation of L-ratios (LR; Log2(Day 2/Day 1 concentrations)) of serum gonadal hormones and neuroinflammatory proteins with mRS > 3 at 6 months. A total of 40 participants were included in this pilot study. LRs were significantly higher for C-reactive protein (CRP; p = 0.013) and lower for interleukin-6 (IL-6; p = 0.026) and surfactant protein-D (p = 0.036) in participants with unfavorable outcomes at 6 months after ICH. Further, higher CRP (p = 0.02) and lower IL-6 (p = 0.035) and surfactant protein-D (p = 0.041) LRs were associated with mRS > 3 at 6 months after ICH in multiple logistic regression analyses, adjusted for race and sex. The relationship amongst gonadal hormones, neuroinflammatory proteins, and ICH outcome is complex. In this pilot study, unfavorable outcomes after ICH may have been associated with selected inflammatory biomarkers. A larger scale study is warranted to define interactions between hormones, proteins, and their effects on ICH outcomes.
Acute Respiratory Distress Syndrome in Patients with Intracerebral Hemorrhage
Introduction: Patients with an intracerebral hemorrhage (ICH) have been shown to have a high incidence of acute respiratory distress syndrome (ARDS). We aimed to determine the incidence of ARDS following ICH in the era of lung-protective ventilation. We also examined risk factors associated with ARDS following ICH. Materials and Methods: A retrospective cohort study of adults admitted to a single health system’s intensive care units with acute, spontaneous ICH from 1 March 2015 to 28 February 2018, using univariate and multivariable logistic regression models to evaluate the associations of patient characteristics with the diagnosis of ARDS. Results: In total, 269 patients were included, with 155 patients requiring invasive mechanical ventilation. The overall incidence of ARDS was 6.7% (18/269), and the incidence in intubated patients was 10% (16/155), as the median time of ventilation with >8 cc/mL of ideal body weight was low. For the entire ICH population, severity of hypoxemia on initial arterial blood gas (ABG; Odds Ratio [OR] per 10 mmHg 0.855 [95% Confidence Interval [CI] 0.74–0.987]) and total minutes of mechanical ventilation (OR per 60 min 1.018 [95% CI 1.007–1.029]) were both associated with the diagnosis of ARDS. In intubated patients, ventilation, younger age (OR per 10 years 0.655 [95% CI 0.431–0.997]), and total minutes of mechanical ventilation (OR per 60 min 1.028 [95% CI 1.006–1.049] increased the odds of developing ARDS. Conclusions: ARDS was found to be significantly lower in the present cohort of ICH patients when compared to prior studies, with younger age and hypoxemia associated with an increasing risk.
Scientifically advanced woody media for improved water quality from livestock woodchip heavy-use areas
Overwintering cattle on pastures in many areas can damage the pasture and lead to impaired water quality. During these times, use ofa woodchip heavy-use area (HUA) presents advantages such as a soft, supportive, and dry toot surface for animals and protection of the pasture and pasture soils. However, woodchip HUAs can also be a centralized source of high nutrient loads due to their drainage outflows. A column study was conducted to assess the nutrient load reduction potential of: 1 ) six types of wood media (including torrefied wood media and biochar) that could be used in a woodchip HUA versus a gravel control, and 2) providing a 48 h retention time within the wood media to enhance nitrogen removal through denitrification. The woody media provided significant liquid waste volume reduction compared to the gravel in simulated events (53%-61% vs. 39% reductions, respectively), and there may be additional liquid storage capacity in the woodchips not utilized during these rapid events. Substantial total nitrogen removal by the wood treatments (mean removal efficiencies 〉 50%) was observed across the sinmlated events, although nitrate leaching also occurred. Nitrate removal was enhanced during the 48 h retention test which showed removal was governed by availability of labile carbon (i.e., fresh woodchips exhibited 〉 70% nitrate removal). The retention test also indicated biochar mixtures provided some of the best total phosphorus removal, but the greatest benefits across all parameters was provided by the Mixed Hardwood treatment.
Alexander the Great: Lessons from History's Undefeated General
The book should be read by every young offi - cer and studied by all those whose interest in military history stems from their desire to improve their leadership skills. A master of maneuver, Alexander not only won the \"tactical\" battle, but he knew how to relentlessly pursue a defeated enemy until he achieved fi nal victory.
M‐16 Rifle
The prototype for the M‐16 rifle was developed by Armalik Division of Fairchild Corporation in the late 1950s. In 1959
The M‐1 Rifle
was the standard small‐arms weapon of the U.S. Army in World War II and the Korean War. Its inventor,
Identification of Initiation Sites for Heavy-Strand and Light-Strand Transcription in Human Mitochondrial DNA
The initiation sites for heavy (H) and light (L) strand transcription in HeLa cell mitochondrial DNA have been investigated by mapping experiments utilizing in vitro ``capped'' mitochondrial RNA molecules or nascent RNA chains. Mitochondrial poly(A)-containing RNA molecules were labeled at their 5′ends with 5′and guanylyltransferase (``capping'' enzyme) and mapped on the mitochondrial genome by DNA transfer hybridization and S1 nuclease protection experiments. A mapping site for the capped [α -32P]GTP ends was found on the H strand very near to the 5′terminus of the 12S rRNA gene, and another site was found on the L strand very near to the 5′terminus of the 7S RNA coding sequence. In parallel experiments, the 5′ends of the nascent chains isolated from mitochondrial DNA transcription complexes were similarly mapped very near to the 5′termini of the 12S rRNA gene and of the 7S RNA coding sequence. The in vitro capped RNA molecules and the nascent chains thus presumably identify the same transcriptional initiation sites on the H strand and the L strand. The occurrence of a second possible initiation site for H-strand transcription 90-110 nucleotides upstream of that described above--i.e., 20-40 nucleotides upstream of the tRNAPhegene--had been previously indicated by a mapping analysis of the nascent RNA chains and has been confirmed in the present work. The presence of two initiation sites for H-strand transcription can be correlated with other types of evidence that point to two different transcription events leading to the synthesis of a polycistronic molecule corresponding to the almost entire H strand and to the synthesis of the rRNA species.