Longitudinal symptoms of post-traumatic stress disorder (PTSD) are often characterized by heterogeneous trajectories, which may have unique pre-, peri- and post-trauma risk and protective factors. To ...date, however, no study has evaluated the nature and determinants of predominant trajectories of PTSD symptoms in World Trade Center (WTC) responders.
A total of 10835 WTC responders, including 4035 professional police responders and 6800 non-traditional responders (e.g. construction workers) who participated in the WTC Health Program (WTC-HP), were evaluated an average of 3, 6 and 8 years after the WTC attacks.
Among police responders, longitudinal PTSD symptoms were best characterized by four classes, with the majority (77.8%) in a resistant/resilient trajectory and the remainder exhibiting chronic (5.3%), recovering (8.4%) or delayed-onset (8.5%) symptom trajectories. Among non-traditional responders, a six-class solution was optimal, with fewer responders in a resistant/resilient trajectory (58.0%) and the remainder exhibiting recovering (12.3%), severe chronic (9.5%), subsyndromal increasing (7.3%), delayed-onset (6.7%) and moderate chronic (6.2%) trajectories. Prior psychiatric history, Hispanic ethnicity, severity of WTC exposure and WTC-related medical conditions were most strongly associated with symptomatic trajectories of PTSD symptoms in both groups of responders, whereas greater education and family and work support while working at the WTC site were protective against several of these trajectories.
Trajectories of PTSD symptoms in WTC responders are heterogeneous and associated uniquely with pre-, peri- and post-trauma risk and protective factors. Police responders were more likely than non-traditional responders to exhibit a resistant/resilient trajectory. These results underscore the importance of prevention, screening and treatment efforts that target high-risk disaster responders, particularly those with prior psychiatric history, high levels of trauma exposure and work-related medical morbidities.
The Energetic Particle Detector (EPD) Investigation is one of five particles and fields investigations on the Magnetospheric Multiscale (MMS) mission. This mission consists of four satellites ...operating in close proximity in elliptical, low-inclination orbits, and is focused upon the fundamental physics of magnetic reconnection. The Energetic Particle Detector (EPD) investigation aboard the four MMS spacecraft consists of two instrument designs, the EIS (Energetic Ion Spectrometer) and the FEEPS (Fly’s Eye Electron Proton Spectrometer). This present paper describes FEEPS from an instrument physics and engineering point of view, and provides some test and calibration data to facilitate effective analysis and use of the flight data for scientific purposes.
A FEEPS consists of six Heads, each composed of two Eyes. Each eye is a particle telescope with a single silicon detector; there are nine electron eyes and three ion eyes per FEEPS. The energy coverage is from 25 keV to 650 keV for electrons and 45 keV to 650 keV for ions. Each eye has sixteen energy channels, the spacing of which can be modified by command. The fields of view and pointing of each eye are designed to provide a broad, instantaneous field of view for the twelve eyes per FEEPS.
There are two FEEPS per MMS spacecraft mounted such that the pair along with the single EIS provide more than
3
π
-sr instantaneous solid-angle coverage and complete coverage in the equatorial region. A twenty-second spacecraft rotation period is divided into sixty-four sectors to provide detailed temporal and spatial sampling.
Data are acquired in three modes: Burst Mode, the primary science mode; Fast Survey Mode; and Slow Survey Mode.
A gradual, stepwise approach to reopening, informed by public health expertise, will be essential
The coronavirus disease 2019 (COVID-19) pandemic has led to an unprecedented disruption of society. ...Institutions of higher education have been no exception. To preserve the safety of their communities and adhere to public health guidance, universities and colleges around the world have rapidly pivoted to fully online teaching and learning models, implemented remote work for the majority of employees, and shuttered countless public spaces and programs. Most “on-site” research activities—in laboratories, in clinics, or in the field—also ground to a halt. Many institutions are now planning or implementing a ramp-up of on-site research activities, which offers an opportunity to begin implementing policies and practices that will lay the groundwork for the eventual reopening of additional onsite academic programming, including teaching. To ramp up safely, institutions are working with stakeholder groups—such as public health experts, as well as faculty, staff, and students—to develop guiding principles that will help inform and drive decision-making over the coming months. We synthesized several risk and decision-making frameworks under development at our universities to develop a set of criteria informed by public health expertise that institutions should consider before and during the first stages of restoring research activities and less certain factors to consider for subsequent phases.
Post-traumatic stress disorder (PTSD) in response to the World Trade Center (WTC) disaster of 11 September 2001 (9/11) is one of the most prevalent and persistent health conditions among both ...professional (e.g. police) and non-traditional (e.g. construction worker) WTC responders, even several years after 9/11. However, little is known about the dimensionality and natural course of WTC-related PTSD symptomatology in these populations.
Data were analysed from 10 835 WTC responders, including 4035 police and 6800 non-traditional responders who were evaluated as part of the WTC Health Program, a clinic network in the New York area established by the National Institute for Occupational Safety and Health. Confirmatory factor analyses (CFAs) were used to evaluate structural models of PTSD symptom dimensionality; and autoregressive cross-lagged (ARCL) panel regressions were used to examine the prospective interrelationships among PTSD symptom clusters at 3, 6 and 8 years after 9/11.
CFAs suggested that five stable symptom clusters best represent PTSD symptom dimensionality in both police and non-traditional WTC responders. This five-factor model was also invariant over time with respect to factor loadings and structural parameters, thereby demonstrating its longitudinal stability. ARCL panel regression analyses revealed that hyperarousal symptoms had a prominent role in predicting other symptom clusters of PTSD, with anxious arousal symptoms primarily driving re-experiencing symptoms, and dysphoric arousal symptoms primarily driving emotional numbing symptoms over time.
Results of this study suggest that disaster-related PTSD symptomatology in WTC responders is best represented by five symptom dimensions. Anxious arousal symptoms, which are characterized by hypervigilance and exaggerated startle, may primarily drive re-experiencing symptoms, while dysphoric arousal symptoms, which are characterized by sleep disturbance, irritability/anger and concentration difficulties, may primarily drive emotional numbing symptoms over time. These results underscore the importance of assessment, monitoring and early intervention of hyperarousal symptoms in WTC and other disaster responders.
Immediate percutaneous coronary intervention (PCI) is the treatment of choice for acute ST-segment elevation myocardial infarction. In this study, PCI that was “facilitated” by pretreatment with ...reteplase plus abciximab or abciximab alone did not improve clinical outcomes and increased bleeding, calling into question the use of facilitated PCI for the treatment of acute myocardial infarction.
PCI that was “facilitated” by pretreatment with reteplase plus abciximab or abciximab alone did not improve clinical outcomes and increased bleeding, calling into question the use of facilitated PCI for the treatment of acute myocardial infarction.
Effective and rapid reperfusion is the most important goal in the treatment of patients with acute ST-segment elevation myocardial infarction.
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,
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When feasible and when performed in a timely and expert fashion, primary percutaneous coronary intervention (PCI) is the preferred strategy for reperfusion in the treatment of ST-segment elevation myocardial infarction, because it has been shown to produce superior clinical outcomes as compared with fibrinolytic therapy.
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–
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Primary PCI has not, however, become the treatment of choice in many locales because of logistical difficulties, including the inability to offer this treatment strategy in a timely fashion.
The time to treatment . . .
Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. However, networks with wireless and other lossy ...links also suffer from significant losses due to bit errors and handoffs. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to end performance in wireless and lossy systems. We compare several schemes designed to improve the performance of TCP in such networks. We classify these schemes into three broad categories: end-to-end protocols, where loss recovery is performed by the sender; link-layer protocols that provide local reliability; and split-connection protocols that break the end-to-end connection into two parts at the base station. We present the results of several experiments performed in both LAN and WAN environments, using throughput and goodput as the metrics for comparison. Our results show that a reliable link-layer protocol that is TCP-aware provides very good performance. Furthermore, it is possible to achieve good performance without splitting the end-to-end connection at the base station. We also demonstrate that selective acknowledgments and explicit loss notifications result in significant performance improvements.
Although the effects of postherpetic neuralgia on physical and emotional functioning have been examined in a number of studies, the impact of acute pain in herpes zoster ("shingles") on ...health-related quality of life has been neglected. We describe the characteristics of herpes zoster pain and examine its relationship to physical, role, social, and emotional functioning in 110 patients with herpes zoster. When we controlled for relevant covariates, we found that greater pain burden, as assessed by the product of pain intensity and duration, was associated with poorer physical functioning, increased emotional distress, and decreased role and social functioning. The results demonstrate that herpes zoster pain has broad effects on the daily lives of patients and on their emotional health. The increasing incidence of herpes zoster that can be anticipated as the population ages requires that clinical trials that examine interventions to prevent or treat herpes zoster pain be given a high priority.
Although more severe acute postoperative pain increases the risk of chronic pain following breast cancer surgery, few studies have examined the characteristics of patients who develop greater acute ...pain. To identify risk factors for acute pain and its persistence one month following breast cancer surgery, a sample of 114 women scheduled for breast cancer surgery was assessed preoperatively for demographic, clinical, and emotional functioning variables that were hypothesized to be associated with acute pain severity. Clinically meaningful postoperative pain was assessed at follow-up interviews 2, 10, and 30 days after surgery. In univariate analyses, the risk of clinically meaningful acute pain was increased among women who were younger, unmarried, had more invasive surgeries, and had greater preoperative emotional distress. In multiple logistic regression analyses, greater preoperative anxiety was the only variable that made an independent contribution to predicting clinically meaningful acute pain at 2 days after surgery whereas younger age, being unmarried, and preoperative anxiety each made an independent contribution to predicting clinically meaningful acute pain that persisted from 2 to 30 days after surgery. These results increase understanding of neurobiologic mechanisms and psychosocial processes that contribute to the development of acute pain following breast cancer surgery and have implications for the development of interventions to prevent it.
We studied whether the use of sirolimus with reduced‐dose tacrolimus, as compared to standard‐dose tacrolimus, after liver transplantation is safe, tolerated and efficacious. In an international ...multicenter, open‐label, active‐controlled randomized trial (2000–2003), adult primary liver transplant recipients (n = 222) were randomly assigned immediately after transplantation to conventional‐dose tacrolimus (trough: 7–15 ng/mL) or sirolimus (loading dose: 15 mg, initial dose: 5 mg titrated to a trough of 4–11 ng/mL) and reduced‐dose tacrolimus (trough: 3–7 ng/mL). The study was terminated after 21 months due to imbalance in adverse events. The 24‐month cumulative incidence of graft loss (26.4% vs. 12.5%, p = 0.009) and patient death (20% vs. 8%, p = 0.010) was higher in subjects receiving sirolimus. A numerically higher rate of hepatic artery thrombosis/portal vein thrombosis was observed in the sirolimus arm (8% vs. 3%, p = 0.065). The incidence of sepsis was higher in the sirolimus arm (20.4% vs. 7.2%, p = 0.006). Rates of acute cellular rejection were similar between the two groups. Early use of sirolimus using a loading dose followed by maintenance doses and reduced‐dose tacrolimus in de novo liver transplant recipients is associated with higher rates of graft loss, death and sepsis when compared to the use of conventional‐dose tacrolimus alone.
This study reports the results of the international, multicenter, controlled randomized trial of adult primary liver transplant recipients receiving de novo sirolimus and reduced dose tacrolimus or conventional dose tacrolimus, which formed the basis of a black box warning for use of sirolimus immediately after liver transplantation. See editorial by Levitsky and Feng on page 249.
Sex effects on ventilatory and oxygen consumption (V̇O
) measurements during exercise have been identified in humans. This study's aim was to evaluate the hypothesis that there are sex effects on ...ventilatory and V̇O
measurements in exercising, untrained yearling Thoroughbreds (Tb). Forty-one Tbs (16 colts, 25 fillies; 19.8 ± 1.4 months old) were recruited. Physiological, ventilatory and exercise data were gathered from horses exercising unridden at high intensity on an all-weather track from a global positioning-heart rate unit and a portable ergospirometry system. Data were analysed with an unpaired Student's t-test and the Benjamini-Hochberg correction for multiple testing (P ≤ 0.05 significant). Mean bodyweight (BW, P = 0.002) and wither height (P = 0.04) were greater for colts than fillies. There were no differences in physiological and exercise data and absolute peak V̇O
between groups. However, fillies had a higher mass specific peak V̇O
(P = 0.03) than colts (121.5 ± 21.6 mL/kg.min vs. 111.9 ± 27.4 mL/kg.min). The peak breathing frequency was greater for fillies (P < 0.001) while the peak inspiratory (P < 0.001) and expiratory air flow (P < 0.001), peak expiratory tidal volume (V
; P < 0.001) and peak minute ventilation (V̇
; P = 0.01) were greater for colts; there were no differences for peak V
and V̇
when adjusted for BW. Differences in BW explain the differences in mass specific peak V̇O
between groups. Given their morphological differences, it is likely that lung volumes and airway diameters are smaller for fillies, resulting in greater resistance and lower air flows and volumes. Further research is required to investigate the ventilatory differences and how they may change with maturation and impact performance.
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