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1.
Injury ; 54(8): 110875, 2023 Aug.
Article in English | MEDLINE | ID: mdl-37349167

ABSTRACT

OBJECTIVE: The ESI algorithm is widely used to triage patients in the emergency room. However, few studies have assessed the reliability of ESI to accurately triage trauma patients. The aim of this study was to compare vital signs, resource utilization, and patient outcomes among trauma patients during the pandemic in 2020 vs. the previous year prior to the pandemic. METHODS: This retrospective study was conducted over a 24-month period at an urban adult level one trauma center. Demographic and clinical characteristics, resource utilization, and patient outcomes were extracted from the electronic medical records and trauma registry. Trauma patients assigned ESI level 2 were stratified by age (<65 years and ≥ 65 years) and year (2019 vs. 2020) for data analysis. RESULTS: A total of 3,788 trauma patients were included in the study. Males represented 68.4% (2,591) of patients and the median age was 50 years (IQR: 31, 69). The majority of patients were assigned ESI level 2 (2,162, 57.1%) and had a blunt mechanism of injury (3,122, 82.4%). In 2020, patients <65 years of age utilized less resources compared to 2019 (p < 0.001). Likewise, patients >65 years of age required less lab tests [OR: 0.1, 95% CI: (0.05 - 0.4)], IV fluids [OR: 0.2, 95% CI: (0.2 -0.3)], IV medications [OR: 0.6, 95% CI: (0.4 - 0.7)], and specialty consultations [OR: 0.4, 95% CI: (0.3 -0.5)] compared to 2019 (p < 0.0001). Within 2020, vital signs and resources utilized between younger and elderly patients varied significantly (p < 0.01). Correspondingly, the clinical outcomes between younger and elderly patients within 2020, differed significantly (p < 0.01). CONCLUSIONS: The COVID-19 pandemic affected the triage of trauma patients. During 2020, patients utilized less resources compared to the previous year. Additionally, younger and elderly patients had different vital signs, resource utilization, and clinical outcomes although both being assigned ESI level 2. Younger trauma patients may have been over-triaged in 2020 due to the COVID-19 pandemic.


Subject(s)
COVID-19 , Pandemics , Male , Adult , Humans , Aged , Middle Aged , Retrospective Studies , Reproducibility of Results , Severity of Illness Index , COVID-19/epidemiology , Emergency Service, Hospital , Triage , Algorithms
2.
J Surg Res ; 283: 523-531, 2023 Mar.
Article in English | MEDLINE | ID: mdl-36436289

ABSTRACT

INTRODUCTION: Acute care surgeons can experience posttraumatic stress disorder (PTSD) due to the cumulative stress of practice. This study sought to document the potential impact of the COVID-19 pandemic on PTSD in acute care surgeons and to identify potential contributing factors. METHODS: The six-item brief version of the PTSD Checklist-Civilian Version (PCL-6), a validated instrument capturing PTSD symptomology, was used to screen Eastern Association for the Surgery of Trauma members. Added questions gauged pandemic effects on professional and hospital systems-level factors. Regression modeling used responses from attending surgeons that fully completed the PCL-6. RESULTS: Complete responses from 334 of 360 attending surgeons were obtained, with 58 of 334 (17%) screening positive for PTSD symptoms. Factors significantly contributing to both higher PCL-6 scores and meeting criteria for PTSD symptomology included decreasing age, increased administrative duties, reduced research productivity, nonurban practice setting, and loss of annual bonuses. Increasing PCL-6 score was also affected by perceived illness risk and higher odds of PTSD symptomology with elective case cancellation. For most respondents, fear of death and concerns of illness from COVID-19 were not associated with increased odds of PTSD symptomology. CONCLUSIONS: The prevalence of PTSD symptomology in this sample was similar to previous reports using surgeon samples (15%-22%). In the face of the COVID-19 pandemic, stress was not directly related to infectious concerns but rather to the collateral challenges caused by the pandemic and unrelated demographic factors. Understanding factors increasing stress in acute care surgeons is critical as part of pandemic planning and management to reduce burnout and maintain a healthy workforce.


Subject(s)
COVID-19 , Stress Disorders, Post-Traumatic , Surgeons , Humans , Pandemics , COVID-19/epidemiology , Stress Disorders, Post-Traumatic/diagnosis , Hospitals
3.
Am J Surg ; 224(3): 843-848, 2022 09.
Article in English | MEDLINE | ID: mdl-35277241

ABSTRACT

BACKGROUND: At the peak of the pandemic, acute care surgeons at many hospitals were reassigned to treat COVID-19 patients. However, the effect of the pandemic on this population who are well versed in stressful practice has not been fully explored. METHODS: A web-based survey was distributed to the members of the Eastern Association for the Surgery of Trauma (EAST). PTSD and the personal and professional impact of the pandemic were assessed. A positive screen was defined as a severity score of ≥14 or a symptomatic response to at least 5 of the 6 questions on the screen. RESULTS: A total of 393 (17.8%) participants responded to the survey. The median age was 43 (IQR: 38-52) and 238 (60.6%) were male. The majority of participants were surgeons (351, 89.3%), specializing in general surgery/trauma (379, 96.4%). The main practice type and setting were hospital-based (350, 89%) and university hospital (238, 60.6%), respectively. The incidence of PTSD was 16.3% when a threshold severity score of ≥14 was used and 5.6% when symptomatic responses were assessed. Risk factors for a positive PTSD screen included being single/unmarried (p = 0.02), having others close to you contract COVID-19 (p = 0.02), having family issues due to COVID-19 (p = 0.0004), rural (p = 0.005) and suburban (p = 0.047) practice settings, a fear of going to work (p = 0.001), and not having mental health resources provided at work (p = 0.03). CONCLUSION: The COVID-19 pandemic had a psychological impact on surgeons. Although acute care surgeons are well versed in stressful practice, the pandemic nevertheless induced PTSD symptoms in this population, suggesting the need for mental health resources.


Subject(s)
COVID-19 , Stress Disorders, Post-Traumatic , Surgeons , Adult , Female , Hospitals, University , Humans , Male , Midazolam , Pandemics
4.
J Community Health ; 46(4): 711-718, 2021 08.
Article in English | MEDLINE | ID: mdl-33090305

ABSTRACT

Demographic and socioeconomic factors can contribute to community spread of COVID-19. The aim of this study is to describe the demographics and socioeconomic factors in relation to geolocation of COVID-19 patients who were discharged from the emergency department (ED) back into the community. This retrospective study was conducted over a 7-week period, at an urban, adult, level 1 trauma center in New York City. Demographics, socioeconomic factors, and geolocation of COVID-19 patients discharged from the ED were extracted from the electronic medical records. Patients were stratified by gender for data analysis. A total of 634 patients were included in the study, 376 (59.3%) were male and 205 (32.3%) were Hispanic White. The median age of patients was 50 years (IQR: 38, 60, Min:15, Max:96). The unemployment rate in our population was 41.2% and 75.5% reported contracting the virus via community spread. ED mortality rate was 11.8%; the majority of which were male (N = 50, 66.7%) and the median age was 70 years (IQR: 59, 82). There were 9.4% (95% CI 2.9-12.4) more Black males and 5.4% (95% CI 0.4-10.4) more males who had no insurance coverage compared to females. 26.8% (95% CI 14.5-39) more females worked in the healthcare field and 7.1% (95% CI 0.3-13.9) more were infected via primary contact compared to males. COVID-19 disproportionately affected minorities and males. Socioeconomic factors should be taken into consideration when preparing strategies for preventing the spread of the virus, especially for individuals who are expected to self-isolate.


Subject(s)
COVID-19 , Emergency Service, Hospital/statistics & numerical data , Pandemics , Adult , COVID-19/epidemiology , COVID-19/therapy , Demography , Female , Hospitals, Urban , Humans , Male , Middle Aged , New York City/epidemiology , Retrospective Studies , SARS-CoV-2 , Socioeconomic Factors
5.
Am J Emerg Med ; 37(4): 620-626, 2019 04.
Article in English | MEDLINE | ID: mdl-30041910

ABSTRACT

STUDY OBJECTIVE: The aim of this study is to determine the accuracy of pre-hospital trauma notifications and the effects of inaccurate information on trauma triage. METHODS: This study was conducted at a level-1 trauma center over a two-year period. Data was collected from pre-notification forms on trauma activations that arrived to the emergency department via ambulance. Trauma activations with pre-notification were compared to those without notification and pre-notification forms were assessed for accuracy and completeness. RESULTS: A total of 2186 trauma activations were included in the study, 1572 (71.9%) had pre-notifications, 614 (28.1%) did not and were initially under-triaged. Pre-notification forms were completed for 1505 (95.7%) patients, of which EMS provided incomplete/inaccurate information for 1204 (80%) patients and complete/accurate information for 301 (20%) patients. Missing GCS/AVPU score (1099, 91.3%), wrong age (357, 29.6%), and missing vitals (303, 25.2%) were the main problems. Missing/wrong information resulted in trauma tier over-activation in 25 (2.1%) patients and under-activation in 20 (1.7%) patients. Under-triaged patients were predominantly male (18, 90%), sustained a fall (9, 45%), transported by BLS EMS teams (12, 60%), and arrived on a weekday (13, 65%) during the time period of 11 pm-7 am (9, 45%). A total of 13 (65%) required emergent intubation, 2 (10%) required massive transfusion activation, 7 (35%) were admitted to ICU, 3 (15%) were admitted directly to the OR, and 1 (15%) died. CONCLUSION: EMS crews frequently provide inaccurate pre-hospital information or do not provide any pre-hospital notification at all, which results in over/under triage of trauma patients.


Subject(s)
Emergency Medical Services/standards , Triage/standards , Wounds and Injuries/therapy , Adult , Ambulances , Emergency Medical Services/statistics & numerical data , Emergency Service, Hospital , Female , Humans , Male , Middle Aged , Prospective Studies , Trauma Centers , Triage/statistics & numerical data , Young Adult
6.
J Safety Res ; 64: 83-92, 2018 02.
Article in English | MEDLINE | ID: mdl-29636172

ABSTRACT

INTRODUCTION: Evaluating age-specific fall characteristics is important for prevention programs. The aim was to characterize fallers who presented to our trauma center. We hypothesized that fall characteristics and outcomes would vary with age. METHODS: Data were retrospectively collected from the trauma registry and electronic medical records during January 1st, 2014-December 31st, 2015. Data were analyzed by Chi-square test with Yates' continuity correction and one-way ANOVA with Bonferroni's multiple comparisons test. RESULTS: There were 1541 fallers, 814 (52.8%) were male. Ages ranged from 11 months to 100years. The admission rate was high at 86%, with an average hospital stay of 5.7days. Patients in the 0-18 and 19-45age groups spent significantly less time in the hospital (p<0.0001). Elderly patients had the highest average injury severity score (p<0.0001). However, the youngest patients required surgery more often (p=0.0004). The overall mortality rate was 3.6% and 52.8% were male. The mortality rate increased with age, from 0% for the 0-18 age group to 6.9% for patients ≥65years of age. Remarkably, fallers in the 19-45 and 46-64age groups predominantly died from ground level falls even though the average fall height in these groups was the highest (p<0.0001). More fallers in the 19-45 and 46-64age groups tested positive for alcohol/drug use (p<0.0001). Middle-aged and elderly patients were more likely to be discharged to a skilled nursing or rehabilitation facility compared to younger patients who were discharged home. CONCLUSIONS AND PRACTICAL APPLICATIONS: Fall characteristics and outcomes varied with age. Data on age-specific characteristics, outcomes, and risk factors of falls will help in developing targeted interventions and may lead to better approaches to treat patients.


Subject(s)
Accidental Falls/statistics & numerical data , Injury Severity Score , Length of Stay/statistics & numerical data , Accidental Falls/mortality , Adolescent , Adult , Age Factors , Aged , Aged, 80 and over , Child , Child, Preschool , Female , Humans , Infant , Infant, Newborn , Male , Middle Aged , Retrospective Studies , Risk Factors , Young Adult
7.
Injury ; 49(5): 975-982, 2018 May.
Article in English | MEDLINE | ID: mdl-29463382

ABSTRACT

BACKGROUND: Falls can result in injuries that require rehabilitation and long-term care after hospital discharge. Identifying factors that contribute to prediction of discharge disposition is crucial for efficient resource utilization and reducing cost. Several factors may influence discharge location after hospitalization for a fall. The aim of this study was to examine clinical and non-clinical factors that may predict discharge disposition after a fall. We hypothesized that age, injury type, insurance type, and functional status would affect discharge location. METHODS: This two-year retrospective study was performed at an urban, adult level-1 trauma center. Fall patients who were discharged home or to a facility after hospital admission were included in the study. Data was obtained from the trauma registry and electronic medical records. Logistic regression modeling was used to assess independent predictors. RESULTS: A total of 1,121 fallers were included in the study. 621 (55.4%) were discharged home and 500 (44.6%) to inpatient rehabilitation (IRF)/skilled nursing facility (SNF). The median age was 64 years (IQR: 49-79) and 48.4% (543) were male. The median length of hospital stay was 5 days (IQR: 2.5-8). Increasing age (p < 0.001), length of stay in the ICU (p < 0.001), injury severity (p < 0.001), number of comorbidities (p = 0.038), having Medicare insurance (p = 0.025), having a fracture at any body region (p < 0.001), and ambulation status (p = 0.025) significantly increased the odds of being discharged to IRF/SNF compared to home. The removal of injury severity score and ICU length of stay from the "late/regular discharge" model, to create an "early discharge" model, decreased the accuracy of the prediction rate from 78.5% to 74.9% (p < 0.001). CONCLUSION: A combination of demographic, clinical, social, economic, and functional factors can together predict discharge disposition after a fall. The majority of these factors can be assessed early in the hospital stay, which may facilitate a timely discharge plan and shorter stays in the hospital.


Subject(s)
Accidental Falls , Length of Stay/statistics & numerical data , Patient Discharge/statistics & numerical data , Wounds and Injuries/rehabilitation , Adult , Aged , Aged, 80 and over , Female , Humans , Length of Stay/economics , Logistic Models , Male , Medicare , Middle Aged , Patient Discharge/economics , Rehabilitation Centers , Retrospective Studies , Severity of Illness Index , United States , Wounds and Injuries/economics , Wounds and Injuries/epidemiology , Young Adult
8.
J Surg Res ; 213: 6-15, 2017 06 01.
Article in English | MEDLINE | ID: mdl-28601333

ABSTRACT

BACKGROUND: Trauma triage decisions can be influenced by both knowledge and experience. Consequently, there may be substantial variability in computed tomography (CT) scans desired by emergency medicine physicians, surgical chief residents, and attending trauma surgeons. We quantified this difference and studied the effects of each group's decisions on missed injuries, cost, and radiation exposure. METHODS: All blunt trauma activations at an urban level 1 trauma center were studied over a 6-mo period. Three months into the study, a pan-scan protocol was introduced. Prior to CT imaging, providers separately completed a survey that asked which CT scans were desired for each patient. Based on the completed surveys, hypothetical missed injuries, radiation exposure, and cost were determined. RESULTS: The variability in the number of CT scans desired by each of the three providers and the resulting cost and radiation exposure were not statistically significant. Substantial variability was predominantly seen in the indications for the desired scans, with the difference between proportions ranging from 3.1%-68.7%. Agreement among the three providers was highest for head and c-spine scans (80%-100%) and lowest for maxillary face (57%-80%) and chest scans (52%-74%). Overall, the missed injury rate was similar for all the providers; chief residents missed significantly more major injuries than trauma attendings during the pan-scan period (P = 0.03). CONCLUSIONS: Trauma training and level of training did not have a substantial effect on radiological decisions during the initial trauma assessment. This study sheds light on the growing uniformity among providers with regard to medical decision-making in the initial work-up of trauma.


Subject(s)
Clinical Decision-Making , Healthcare Disparities/statistics & numerical data , Practice Patterns, Physicians'/statistics & numerical data , Tomography, X-Ray Computed/statistics & numerical data , Triage/statistics & numerical data , Wounds, Nonpenetrating/diagnostic imaging , Adult , Aged , Aged, 80 and over , Emergency Service, Hospital , Female , Humans , Internship and Residency , Longitudinal Studies , Male , Middle Aged , New York , Prospective Studies , Surgeons , Trauma Centers
9.
Aust Occup Ther J ; 64(5): 350-357, 2017 Oct.
Article in English | MEDLINE | ID: mdl-28508437

ABSTRACT

BACKGROUND/AIM: Health promotion and prevention is an important component of occupational therapy practice. Falls are one of the most common causes of ER visits among older adults and injurious falls requiring trauma care can have a significant impact on the health and quality of life of elders. The aim of this study was to compare characteristics and consequences of falls among older adult trauma patients across different age groups with an eye towards informing injury prevention programs. METHODS: A retrospective study using the trauma database from a level one trauma centre in the U.S. (N = 711) was conducted. We compared patient and fall characteristics across age groups and then used logistic regression to estimate odds ratios for hospital length of stay >4 days, discharge disposition, and injury severity (ISS >15). RESULTS: Associations between age group and fall height, location and alcohol use at the time of the fall were statistically significant (P < 0.0001). As compared to the reference group (85 and older), younger age groups had lower odds ratios for discharge to a facility for rehabilitation. CONCLUSION: Results highlight differences among age groups of fallers admitted for trauma care and can help to inform injury prevention programs related to outdoor and indoor falls.


Subject(s)
Accidental Falls/prevention & control , Accidental Falls/statistics & numerical data , Wounds and Injuries/epidemiology , Wounds and Injuries/prevention & control , Age Factors , Aged , Aged, 80 and over , Alcohol Drinking/epidemiology , Comorbidity , Female , Humans , Injury Severity Score , Length of Stay , Logistic Models , Male , Middle Aged , Occupational Therapy , Patient Discharge/statistics & numerical data , Quality of Life , Retrospective Studies , Risk Factors , Trauma Centers/statistics & numerical data , United States/epidemiology
11.
Am Surg ; 83(2): 183-190, 2017 Feb 01.
Article in English | MEDLINE | ID: mdl-28228206

ABSTRACT

Although percutaneous endoscopic gastrostomy (PEG) tube placement is a common and safe procedure to provide enteral feeding, some patients develop complications. The aim of this study was to identify risk factors for the development of post-PEG complications. We hypothesized that patients with low albumin, diabetes, higher body mass index (BMI), thicker abdominal walls, or psychomotor agitation would have more complications. A 2-year retrospective review was performed on patients who received a PEG tube at a single institution. Variables collected included age, preoperative albumin, BMI, abdominal wall thickness (AWT), psychomotor agitation, preoperative diabetes mellitus, and mortality. A total of 91 patients (70.3% male) were identified (mean age 58.7 years, SD 18.6). Seventeen patients (18.7%) had post-PEG complications and the 30-day mortality rate was 14.3 per cent. Mortality was not attributable to tube placement. Patients with complications weighed less (P = 0.005) and had a lower BMI (P = 0.010) than patients without complications. Additionally, patients with complications had significantly lower AWT (P = 0.02), mean AWT was 21.6 mm (SD 7.6) versus 27.6 mm (SD 8.1) in the noncomplication patients. AWT was the only factor independently associated with post-PEG complications (P = 0.047). There was no significant association between complications and mortality. Continued investigation on how to limit post-PEG complications remains imperative. In our population, lower AWT was independently associated with complications. Preoperative measurement of AWT by preprocedural imaging can potentially be used to predict the risk of post-PEG complications.


Subject(s)
Abdominal Wall/anatomy & histology , Gastrostomy/adverse effects , Postoperative Complications/etiology , Adult , Aged , Aged, 80 and over , Body Mass Index , Body Weight , Diabetes Mellitus , Female , Gastrostomy/methods , Gastrostomy/mortality , Humans , Male , Middle Aged , Organ Size , Postoperative Complications/mortality , Psychomotor Agitation , Retrospective Studies , Risk Factors , Serum Albumin/analysis , Thinness/complications , Young Adult
12.
Emerg Radiol ; 24(4): 347-353, 2017 Aug.
Article in English | MEDLINE | ID: mdl-28181026

ABSTRACT

PURPOSE: The frequency of computed tomography (CT) imaging of trauma patients has given rise to an increase in the discovery of incidental findings. The purpose of this study was to evaluate the frequency and documentation of follow-up recommendations of incidental findings during the initial trauma evaluation. Secondarily, trauma patients with and without incidental findings were compared. We hypothesized that there would be a high rate of incidental findings in trauma patients and that these findings would be poorly documented. METHODS: A retrospective review of CT imaging performed during trauma assessment at an urban level 1 trauma center was conducted. Prospectively documented incidental findings over a 6-month period were recorded. The frequency of incidental findings and follow-up referrals were analyzed. Mann-Whitney non-parametric test and Fisher's exact test were used to compare patients with and without incidental findings, and logistic regression was performed to identify independent risk factors. RESULTS: Of the 1573 CT scans performed, 478 (30.4%) revealed incidental findings. The abdomen/pelvis had the highest rate of incidental findings (61.7%). Of the 416 patients, 295 (70.9%) had a total of 858 incidental findings, with an average of 3 findings per patient. Follow-up was required for 24 (2.8%) incidental findings, and admission/immediate intervention was required for 6 (0.7%) findings. Only 12 (1.4%) incidental findings were documented in the discharge note. Increasing age (p < 0.001), a higher body mass index (BMI) (p = 0.015), and receiving a pan-CT (p < 0.001) increased the odds of having an incidental finding. CONCLUSION: A large percentage of trauma patients have incidental findings. Therefore, better documentation and follow-up are needed to determine the long-term outcomes of patients with clinically relevant incidental findings.


Subject(s)
Incidental Findings , Tomography, X-Ray Computed , Wounds, Nonpenetrating/diagnostic imaging , Adult , Female , Follow-Up Studies , Humans , Male , Middle Aged , Prevalence , Retrospective Studies , Risk Factors , Trauma Centers , Wounds, Nonpenetrating/mortality
13.
Geriatr Gerontol Int ; 17(6): 905-912, 2017 Jun.
Article in English | MEDLINE | ID: mdl-27138451

ABSTRACT

AIM: The aim of the present study was to examine significant differences in patient characteristics, associated factors and outcomes for indoor versus outdoor falls among trauma patients. METHODS: A retrospective cross-sectional study using data from the trauma registry and electronic medical records at a level 1 trauma center in the USA was carried out. People aged 55 years or older, for whom fall location could be identified (n = 712), were included in the study. Demographic information, functional status before admission, comorbid conditions, activation level, Injury Severity Score, discharge disposition and injury type were included in the comparative analyses. Associated factors for falls and fractures in each location were also examined using logistic regression. RESULTS: Significant differences were found in patient characteristics between indoor and outdoor fallers. Significant differences in outcomes were found related to discharge disposition and injury type. Open wounds were more common among outdoor fallers (26.5%) as compared with indoor fallers (16.3%, P = 0.002). Although disorders of joints with difficulty walking were associated with fractures among both indoor (OR 7.20, CI 2.19-23.66) and outdoor fallers (OR 5.65, CI 1.27-25.06), sex was only associated with fractures among those who fell indoors (OR 1.69 CI 1.12-2.56). CONCLUSIONS: Significant differences exist in characteristics of indoor and outdoor fallers, and for discharge disposition and injury type for each fall location among patients admitted for trauma care. Factors associated with fractures differ between indoor and outdoor fallers. Results can help to inform targeted primary and secondary prevention initiatives. Geriatr Gerontol Int 2017; 17: 905-912.


Subject(s)
Accidental Falls/statistics & numerical data , Wounds and Injuries/epidemiology , Aged , Cross-Sectional Studies , Environment , Female , Humans , Injury Severity Score , Logistic Models , Male , Middle Aged , Retrospective Studies , Risk Factors
14.
Am J Emerg Med ; 35(1): 13-19, 2017 Jan.
Article in English | MEDLINE | ID: mdl-27773351

ABSTRACT

STUDY OBJECTIVE: The aim of this study is to determine if the introduction of a pan-scan protocol during the initial assessment for blunt trauma activations would affect missed injuries, incidental findings, treatment times, radiation exposure, and cost. METHODS: A 6-month prospective study was performed on patients with blunt trauma at a level 1 trauma center. During the last 3 months of the study, a pan-scan protocol was introduced to the trauma assessment. Categorical data were analyzed by Fisher exact test and continuous data were analyzed by Mann-Whitney nonparametric test. RESULTS: There were a total of 220 patients in the pre-pan-scan period and 206 patients during the pan-scan period. There was no significant difference in injury severity or mortality between the groups. Introduction of the pan-scan protocol substantially reduced the incidence of missed injuries from 3.2% to 0.5%, the length of stay in the emergency department by 68.2 minutes (95% confidence interval [CI], -134.4 to -2.1), and the mean time to the first operating room visit by 1465 minutes (95% CI, -2519 to -411). In contrast, fixed computed tomographic scan cost increased by $48.1 (95% CI, 32-64.1) per patient; however, total radiology cost per patient decreased by $50 (95% CI, -271.1 to 171.4). In addition, the rate of incidental findings increased by 14.4% and the average radiation exposure per patient was 8.2 mSv (95% CI, 5.0-11.3) greater during the pan-scan period. CONCLUSION: Although there are advantages to whole-body computed tomography, elucidation of the appropriate blunt trauma patient population is warranted when implementing a pan-scan protocol.


Subject(s)
Abdominal Injuries/diagnostic imaging , Clinical Protocols , Craniocerebral Trauma/diagnostic imaging , Spinal Injuries/diagnostic imaging , Thoracic Injuries/diagnostic imaging , Tomography, X-Ray Computed/methods , Whole Body Imaging/methods , Wounds, Nonpenetrating/diagnostic imaging , Adult , Aged , Diagnostic Errors/statistics & numerical data , Emergency Service, Hospital , Female , Health Care Costs/statistics & numerical data , Humans , Length of Stay/statistics & numerical data , Male , Middle Aged , Pelvis/diagnostic imaging , Prospective Studies , Time-to-Treatment/statistics & numerical data , Tomography, X-Ray Computed/economics , Whole Body Imaging/economics , Wounds, Nonpenetrating/economics , Wounds, Nonpenetrating/surgery
15.
Mol Cell Biol ; 29(4): 986-99, 2009 Feb.
Article in English | MEDLINE | ID: mdl-19075005

ABSTRACT

Cell cycle progression is regulated by cyclin-dependent kinases (cdk's), which in turn are regulated by their interactions with stoichiometric inhibitors, such as p27(Kip1). Although p27 associates with cyclin D-cyclin-dependent kinase 4 (cdk4) constitutively, whether or not it inhibits this complex is dependent on the absence or presence of a specific tyrosine phosphorylation that converts p27 from a bound inhibitor to a bound noninhibitor under different growth conditions. This phosphorylation occurs within the 3-10 helix of p27 and may dislodge the helix from cdk4's active site to allow ATP binding. Here we show that the interaction of nonphosphorylated p27 with cdk4 also prevents the activating phosphorylation of the T-loop by cyclin H-cdk7, the cdk-activating kinase (CAK). Even though the cyclin H-cdk7 complex is present and active in contact-arrested cells, p27's association with cyclin D-cdk4 prevents T-loop phosphorylation. When p27 is tyrosine phosphorylated in proliferating cells or in vitro with the tyrosine Y kinase Abl, phosphorylation of cdk4 by cyclin H-cdk7 is permitted, even without dissociation of p27. This suggests that upon release from the contact-arrested state, a temporal order for the reactivation of inactive p27-cyclin D-cdk4 complexes must exist: p27 must be Y phosphorylated first, directly permitting cyclin H-cdk7 phosphorylation of residue T172 and the consequent restoration of kinase activity. The non-Y-phosphorylated p27-cyclin D-cdk4 complex could be phosphorylated by purified Csk1, a single-subunit CAK from fission yeast, but was still inactive due to p27's occlusion of the active site. Thus, the two modes by which p27 inhibits cyclin D-cdk4 are independent and may reinforce one another to inhibit kinase activity in contact-arrested cells, while maintaining a reservoir of preformed complex that can be activated rapidly upon cell cycle reentry.


Subject(s)
Cyclin-Dependent Kinase 4/antagonists & inhibitors , Cyclin-Dependent Kinase 4/metabolism , Cyclin-Dependent Kinase Inhibitor p27/metabolism , Cyclins/antagonists & inhibitors , Cyclins/metabolism , Amino Acid Substitution , Animals , Catalysis , Cyclin D , Cyclin H , Cyclin-Dependent Kinases/metabolism , Enzyme Activation , Mice , Mutant Proteins/metabolism , Phosphoprotein Phosphatases/metabolism , Phosphorylation , Resting Phase, Cell Cycle , Tyrosine/metabolism , Cyclin-Dependent Kinase-Activating Kinase
16.
Mol Cell Biol ; 28(1): 498-510, 2008 Jan.
Article in English | MEDLINE | ID: mdl-17908796

ABSTRACT

Whether p27 is a cyclin D-cdk4/6 inhibitor or not is controversial, and how it might switch between these two modes is unknown. Arguing for a two-state mechanism, we show that p27 bound to cyclin D-cdk4 can be both inhibitory and noninhibitory, due to its differential-growth-state-dependent tyrosine phosphorylation. We found that p27 from proliferating cells was noninhibitory but that p27 from arrested cells was inhibitory, and the transition from a bound noninhibitor to a bound inhibitor was not due to an increase in p27 concentration. Rather, two tyrosine residues (Y88 and Y89) in p27's cdk interaction domain were phosphorylated preferentially in proliferating cells, which converted p27 to a noninhibitor. Concordantly, mutation of these sites rendered p27 resistant to phosphorylation and locked it into the bound-inhibitor mode in vivo and in vitro. Y88 was directly phosphorylated in vitro by the tyrosine kinase Abl, which converted p27 to a cdk4-bound noninhibitor. These data show that the growth-state-dependent tyrosine phosphorylation of p27 modulates its inhibitory activity in vivo.


Subject(s)
Cyclin-Dependent Kinase 4/antagonists & inhibitors , Cyclin-Dependent Kinase 4/metabolism , Cyclin-Dependent Kinase Inhibitor p27/metabolism , Cyclins/metabolism , Animals , Cell Cycle , Cell Line , Cyclin D , Cyclin-Dependent Kinase 4/genetics , Cyclin-Dependent Kinase Inhibitor p27/genetics , Cyclins/genetics , Mink , Mutation/genetics , Phosphorylation , Protein Binding , Protein Processing, Post-Translational , Proto-Oncogene Proteins c-abl/genetics , Proto-Oncogene Proteins c-abl/metabolism
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