Biomedical subjects

D Scott Obrosky

Publications and source records attributed to D Scott Obrosky.

13 recordsLinked to original sources

PubMed2006

Racial differences in 30-day mortality for pulmonary embolism.

OBJECTIVES: Previous studies reported a higher incidence of in-hospital mortality for Black patients who had pulmonary embolism than for White patients. We used a large statewide database to compare 30-day mortality (defined as death within 30 days from the date of latest hospital admission) for Black and White patients who were hospitalized because of pulmonary embolism. METHODS: The study cohort consisted of 15531 discharged patients who had been treated for pulmonary embolism at 186 Pennsylvania hospitals between January 2000 and November 2002. We used random-effects logistic regression to model 30-day mortality for Black and White patients, and adjusted for patient demographic and clinical characteristics. RESULTS: The unadjusted 30-day mortality rates were 9.0% for White patients, 10.3% for Blacks, and 10.9% for patients of other or unknown race. When adjusted for severity of disease using a validated clinical prognostic model for pulmonary embolism, Black patients had 30% higher odds of 30-day mortality compared with White patients at the same site (adjusted odds ratio = 1.3; 95% confidence interval, 1.1,1.6). Neither insurance status nor hospital volume was a significant predictor of 30-day mortality. CONCLUSION: Black patients who had pulmonary embolism had significantly higher odds of 30-day mortality compared with White patients.

Adolescent↗

PubMed2006

A prediction rule to identify low-risk patients with pulmonary embolism.

BACKGROUND: A simple prognostic model could help identify patients with pulmonary embolism who are at low risk of death and are candidates for outpatient treatment. METHODS: We randomly allocated 15,531 retrospectively identified inpatients who had a discharge diagnosis of pulmonary embolism from 186 Pennsylvania hospitals to derivation (67%) and internal validation (33%) samples. We derived our rule to predict 30-day mortality using classification tree analysis and patient data routinely available at initial examination as potential predictor variables. We used data from a European prospective study to externally validate the rule among 221 inpatients with pulmonary embolism. We determined mortality and nonfatal adverse medical outcomes across derivation and validation samples. RESULTS: Our final model consisted of 10 patient factors (age > or = 70 years; history of cancer, heart failure, chronic lung disease, chronic renal disease, and cerebrovascular disease; and clinical variables of pulse rate > or = 110 beats/min, systolic blood pressure < 100 mm Hg, altered mental status, and arterial oxygen saturation < 90%). Patients with none of these factors were defined as low risk. The 30-day mortality rates for low-risk patients were 0.6%, 1.5%, and 0% in the derivation, internal validation, and external validation samples, respectively. The rates of nonfatal adverse medical outcomes were less than 1% among low-risk patients across all study samples. CONCLUSIONS: This simple prediction rule accurately identifies patients with pulmonary embolism who are at low risk of short-term mortality and other adverse medical outcomes. Prospective validation of this rule is important before its implementation as a decision aid for outpatient treatment.

Age Factors↗

PubMed2006

The emergency department triage of community-acquired pneumonia project data and documentation systems: a model for multicenter clinical trials.

Multicenter clinical trials are complex undertakings that require significant resources to ensure efficient, high quality research. This paper describes the goals, design, and implementation of a multicenter clinical trial database management system to support this aim. A large number of study sites or patients, and the goal of automatically generating large portions of data management infrastructure from common metadata, motivated the development of the system. This paper also describes extensions for a generalized project documentation system, and discusses plans for further extensions and improvements based on observed strengths, limitations, and anticipated technological change.

Community-Acquired Infections↗

PubMed2006

Factors associated with the hospitalization of low-risk patients with community-acquired pneumonia in a cluster-randomized trial.

BACKGROUND: Many low-risk patients with pneumonia are hospitalized despite recommendations to treat such patients in the outpatient setting. OBJECTIVE: To identify the factors associated with the hospitalization of low-risk patients with pneumonia. METHODS: We analyzed data collected by retrospective chart review for 1,889 low-risk patients (Pneumonia Severity Index [PSI] risk classes I to III without evidence of arterial oxygen desaturation) enrolled in a cluster-randomized trial conducted in 32 emergency departments. RESULTS: Overall, 845 (44.7%) of all low-risk patients were treated as inpatients. Factors independently associated with an increased odds of hospitalization included PSI risk classes II and III, the presence of medical or psychosocial contraindications to outpatient treatment, comorbid conditions that were not contained in the PSI (cognitive impairment, history of coronary artery disease, diabetes mellitus, or pulmonary disease), multilobar radiographic infiltrates, and home therapy with oxygen, corticosteroids, or antibiotics before presentation. While 32.8% of low-risk inpatients had a contraindication to outpatient treatment and 47.1% had one or more preexisting treatments, comorbid conditions, or radiographic abnormalities not contained in the PSI, 20.1% had no identifiable risk factors for hospitalization other than PSI risk class II or III. CONCLUSIONS: Hospital admission appears justified for one-third of low-risk inpatients based upon the presence of one or more contraindications to outpatient treatment. At least one-fifth of low-risk inpatients did not have a contraindication to outpatient treatment or an identifiable risk factor for hospitalization, suggesting that treatment of a larger proportion of such low-risk patients in the outpatient setting could be achieved without adversely affecting patient outcomes.

Cluster Analysis↗

PubMed2005

Effect of increasing the intensity of implementing pneumonia guidelines: a randomized, controlled trial.

BACKGROUND: Despite the development of evidence-based pneumonia guidelines, limited data exist on the most effective means to implement guideline recommendations into clinical practice. OBJECTIVE: To compare the effectiveness and safety of 3 guideline implementation strategies. DESIGN: Cluster-randomized, controlled trial. SETTING: 32 emergency departments in Pennsylvania and Connecticut. PATIENTS: 3219 patients with a clinical and radiographic diagnosis of pneumonia. INTERVENTIONS: The authors implemented a project-developed guideline for the initial site of treatment based on the Pneumonia Severity Index and performance of evidence-based processes of care at the emergency department level. Guideline implementation strategies were defined as low (n = 8), moderate (n = 12), and high intensity (n = 12). MEASUREMENTS: Effectiveness outcomes were the rate at which low-risk patients were treated on an outpatient basis and the performance of recommended processes of care. Safety outcomes included death, subsequent hospitalization for outpatients, and medical complications for inpatients. RESULTS: More low-risk patients (n = 1901) were treated as outpatients in the moderate-intensity and high-intensity groups than in the low-intensity group (high-intensity group, 61.9%; moderate-intensity group, 61.0%; low-intensity group, 37.5%; P = 0.004). More outpatients (n = 1125) in the high-intensity group received all 4 recommended processes of care (high-intensity group, 60.9%; moderate-intensity group, 28.3%; low-intensity group, 25.3%; P < 0.001); more inpatients (n = 2076) in the high-intensity group received all 4 recommended processes of care (high-intensity group, 44.3%; moderate-intensity group, 30.1%; low-intensity group, 23.0%; P < 0.001). No statistically significant differences in safety outcomes were observed across interventions. LIMITATIONS: Twenty percent of eligible patients were not enrolled, and data on effectiveness outcomes were not collected before the trial. CONCLUSIONS: Both moderate-intensity and high-intensity guideline implementation strategies safely increased the proportion of low-risk patients with pneumonia who were treated as outpatients. The high-intensity strategy was most effective for increasing the performance of the recommended processes of care for outpatients and inpatients.

Aged↗

PubMed2005

Derivation and validation of a prognostic model for pulmonary embolism.

RATIONALE: An objective and simple prognostic model for patients with pulmonary embolism could be helpful in guiding initial intensity of treatment. OBJECTIVES: To develop a clinical prediction rule that accurately classifies patients with pulmonary embolism into categories of increasing risk of mortality and other adverse medical outcomes. METHODS: We randomly allocated 15,531 inpatient discharges with pulmonary embolism from 186 Pennsylvania hospitals to derivation (67%) and internal validation (33%) samples. We derived our prediction rule using logistic regression with 30-day mortality as the primary outcome, and patient demographic and clinical data routinely available at presentation as potential predictor variables. We externally validated the rule in 221 inpatients with pulmonary embolism from Switzerland and France. MEASUREMENTS: We compared mortality and nonfatal adverse medical outcomes across the derivation and two validation samples. MAIN RESULTS: The prediction rule is based on 11 simple patient characteristics that were independently associated with mortality and stratifies patients with pulmonary embolism into five severity classes, with 30-day mortality rates of 0-1.6% in class I, 1.7-3.5% in class II, 3.2-7.1% in class III, 4.0-11.4% in class IV, and 10.0-24.5% in class V across the derivation and validation samples. Inpatient death and nonfatal complications were <or= 1.1% among patients in class I and <or= 1.9% among patients in class II. CONCLUSIONS: Our rule accurately classifies patients with pulmonary embolism into classes of increasing risk of mortality and other adverse medical outcomes. Further validation of the rule is important before its implementation as a decision aid to guide the initial management of patients with pulmonary embolism.

Acute Disease↗

PubMed2005

Prospective comparison of three validated prediction rules for prognosis in community-acquired pneumonia.

PURPOSE: We assessed the performance of 3 validated prognostic rules in predicting 30-day mortality in community-acquired pneumonia: the 20 variable Pneumonia Severity Index and the easier to calculate CURB (confusion, urea nitrogen, respiratory rate, blood pressure) and CURB-65 severity scores. SUBJECTS AND METHODS: We prospectively followed 3181 patients with community-acquired pneumonia from 32 hospital emergency departments (January-December 2001) and assessed mortality 30 days after initial presentation. Patients were stratified into Pneumonia Severity Index risk classes (I-V) and CURB (0-4) and CURB-65 (0-5) risk strata. We compared the discriminatory power (area under the receiver operating characteristic curve) of these rules to predict mortality and their accuracy based on sensitivity, specificity, predictive values, and likelihood ratios. RESULTS: The Pneumonia Severity Index (risk classes I-III) classified a greater proportion of patients as low risk (68% [2152/3181]) than either a CURB score <1 (51% [1635/3181]) or a CURB-65 score <2 (61% [1952/3181]). Low-risk patients identified based on the Pneumonia Severity Index had a slightly lower mortality (1.4% [31/2152]) than patients classified as low-risk based on the CURB (1.7% [28/1635]) or the CURB-65 (1.7% [33/1952]). The area under the receiver operating characteristic curve was higher for the Pneumonia Severity Index (0.81) than for either the CURB (0.73) or CURB-65 (0.76) scores (P <0.001, for each pairwise comparison). At comparable cut-points, the Pneumonia Severity Index had a higher sensitivity and a somewhat higher negative predictive value for mortality than either CURB score. CONCLUSIONS: The more complex Pneumonia Severity Index has a higher discriminatory power for short-term mortality, defines a greater proportion of patients at low risk, and is slightly more accurate in identifying patients at low risk than either CURB score.

Aged↗

PubMed2005

Using randomized controlled trial data, the agreement between retrospectively and prospectively collected data comprising the pneumonia severity index was substantial.

OBJECTIVE: To assess the agreement between prospectively and retrospectively determined variables comprising the Pneumonia Severity Index (PSI), assignment to PSI risk class, and designation as low risk, based on these two methods of data collection. STUDY DESIGN AND SETTING: We analyzed data from a randomized trial of patients with community-acquired pneumonia managed in 32 hospital emergency departments (EDs). For all enrolled patients, the 20 PSI variables were collected prospectively by ED providers and retrospectively by medical record abstractors. We examined the agreement for each of the 20 PSI variables, assignment to the five PSI risk classes, and classification of patients as low (classes I-III) vs. high (classes IV and V) risk. Agreement was measured using total percent agreement and the kappa statistic. RESULTS: Among the 3,220 enrolled patients, percent agreement was >90% for 18 of the 20 variables comprising the PSI, with most unweighted kappa's being >0.6. Agreement was substantial for assignment to PSI risk class (percent agreement: 92.7%; weighted kappa: 0.79) and for classification as low vs. high risk (percent agreement: 88.5%; unweighted kappa: 0.74). CONCLUSION: There was substantial agreement between retrospective and prospective assignment to PSI risk class, classification as low vs. high risk, and the determination of most individual variables that constitute the PSI.

Adolescent↗

PubMed2004

The emergency department community-acquired pneumonia trial: Methodology of a quality improvement intervention.

Community-acquired pneumonia causes more than 4 million episodes of illness each year and has high morbidity, mortality, and total cost of care. Nationwide, nearly 75% of community-acquired pneumonia patients are initially evaluated and treated in hospital-based emergency departments (EDs). Substantial variation exists in illness severity assessment, hospital admission decisions, and performance of recommended processes of care. We designed an ED-based quality improvement trial focused on the initial care of patients with community-acquired pneumonia. We used the Pneumonia Severity Index and level of arterial oxygenation to identify patients at low risk for 30-day mortality and to guide admission decisionmaking. We assessed the performance of recommended "best practices," consisting of assessment of arterial oxygenation, the collection of blood cultures for inpatients, and the timely initiation of appropriate empiric antibiotic therapy for inpatients and outpatients. We conducted a 32-site, cluster-randomized trial in Pennsylvania and Connecticut, comparing the effectiveness and safety of 3 guideline implementation strategies of increasing intensity. The multifaceted implementation plans were carried out in conjunction with each state's quality improvement organization. This article describes the background, objectives, and methodology of this trial to translate evidence-based knowledge on the quality and efficiency of care for community-acquired pneumonia into clinical practice.

Anti-Bacterial Agents↗

PubMed2003

Implementation of an evidence-based guideline to reduce duration of intravenous antibiotic therapy and length of stay for patients hospitalized with community-acquired pneumonia: a randomized controlled trial.

PURPOSE: Patients with pneumonia often remain hospitalized after they are stable clinically, and the duration of intravenous antibiotic therapy is a rate-limiting step for discharge. The purpose of this study was to determine whether implementation of an evidence-based guideline would reduce the duration of intravenous antibiotic therapy and length of stay for patients hospitalized with pneumonia. METHODS: In a seven-site, cluster randomized clinical trial, we enrolled 325 control and 283 intervention patients who were admitted by one of 116 physician groups. Within site, physician groups were assigned randomly to receive a practice guideline alone (control arm) or a practice guideline that was implemented using a multifaceted strategy (intervention arm). The effectiveness of guideline implementation was measured by the duration of intravenous antibiotic therapy and length of stay; differences in the rates of discontinuation and hospital discharge were assessed with proportional hazards models. Medical outcomes were assessed at 30 days. RESULTS: Intravenous antibiotic therapy was discontinued somewhat more quickly in the intervention group (hazard ratio [HR] =1.23; 95% confidence interval [CI]: 1.00 to 1.52; P = 0.06) than in the control group. Intervention patients were discharged more quickly, but the difference was not statistically significant (HR = 1.16; 95% CI: 0.97 to 1.38; P = 0.11). Fewer intervention (55% [157/283]) than control (63% [206/325]) patients had medical complications during the index hospitalization (P = 0.04), with no differences in other medical outcomes, including mortality, rehospitalization, and return to usual activities, between treatment arms. CONCLUSIONS: The multifaceted guideline implementation strategy resulted in a slight reduction in the duration of intravenous antibiotic therapy and a nonsignificant reduction in length of stay, without affecting patient outcomes.

Aged↗

PubMed2002

Severe community-acquired pneumonia: use of intensive care services and evaluation of American and British Thoracic Society Diagnostic criteria.

Despite careful evaluation of changes in hospital care for community-acquired pneumonia (CAP), little is known about intensive care unit (ICU) use in the treatment of this disease. There are criteria that define CAP as "severe," but evaluation of their predictive value is limited. We compared characteristics, course, and outcome of inpatients who did (n = 170) and did not (n = 1,169) receive ICU care in the Pneumonia Patient Outcomes Research Team prospective cohort. We also assessed the predictive characteristics of four prediction rules (the original and revised American Thoracic Society criteria, the British Thoracic Society criteria, and the Pneumonia Severity Index [PSI]) for ICU admission, mechanical ventilation, medical complications, and death (as proxies for severe CAP). ICU patients were more likely to be admitted from home and had more comorbid conditions. Reasons for ICU admission included respiratory failure (57%), hemodynamic monitoring (32%), and shock (16%). ICU patients incurred longer hospital stays (23.2 vs. 9.1 days, p < 0.001), higher hospital costs (21,144 dollars vs. 5,785 dollars, p < 0.001), more nonpulmonary organ dysfunction, and higher hospital mortality (18.2 vs. 5.0%, p < 0.001). Although ICU patients were sicker, 27% were of low risk (PSI Risk Classes I-III). Severity-adjusted ICU admission rates varied across institutions, but mechanical ventilation rates did not. The revised American Thoracic Society criteria rule was the best discriminator of ICU admission and mechanical ventilation (area under the receiver operating characteristic curve, 0.68 and 0.74, respectively) but none of the prediction rules were particularly good. The PSI was the best predictor of medical complications and death (area under the receiver operating characteristic curve, 0.65 and 0.75, respectively), but again, none of the prediction rules were particularly good. In conclusion, ICU use for CAP is common and expensive but admission rates are variable. Clinical prediction rules for severe CAP do not appear adequately robust to guide clinical care at the current time.

Adolescent↗

PubMed2002

Causes of death for patients with community-acquired pneumonia: results from the Pneumonia Patient Outcomes Research Team cohort study.

BACKGROUND: To our knowledge, no previous study has systematically examined pneumonia-related and pneumonia-unrelated mortality. This study was performed to identify the cause(s) of death and to compare the timing and risk factors associated with pneumonia-related and pneumonia-unrelated mortality. METHODS: For all deaths within 90 days of presentation, a synopsis of all events preceding death was independently reviewed by 2 members of a 5-member review panel (C.M.C., D.E.S., T.J.M., W.N.K., and M.J.F.). The underlying and immediate causes of death and whether pneumonia had a major, a minor, or no apparent role in the death were determined using consensus. Death was defined as pneumonia related if pneumonia was the underlying or immediate cause of death or played a major role in the cause of death. Competing-risk Cox proportional hazards regression models were used to identify baseline characteristics associated with mortality. RESULTS: Patients (944 outpatients and 1343 inpatients) with clinical and radiographic evidence of pneumonia were enrolled, and 208 (9%) died by 90 days. The most frequent immediate causes of death were respiratory failure (38%), cardiac conditions (13%), and infectious conditions (11%); the most frequent underlying causes of death were neurological conditions (29%), malignancies (24%), and cardiac conditions (14%). Mortality was pneumonia related in 110 (53%) of the 208 deaths. Pneumonia-related deaths were 7.7 times more likely to occur within 30 days of presentation compared with pneumonia-unrelated deaths. Factors independently associated with pneumonia-related mortality were hypothermia, altered mental status, elevated serum urea nitrogen level, chronic liver disease, leukopenia, and hypoxemia. Factors independently associated with pneumonia-unrelated mortality were dementia, immunosuppression, active cancer, systolic hypotension, male sex, and multilobar pulmonary infiltrates. Increasing age and evidence of aspiration were independent predictors of both types of mortality. CONCLUSIONS: For patients with community-acquired pneumonia, only half of all deaths are attributable to their acute illness. Differences in the timing of death and risk factors for mortality suggest that future studies of community-acquired pneumonia should differentiate all-cause and pneumonia-related mortality.

Cause of Death↗

PubMed2002

Community-acquired pneumonia and do not resuscitate orders.

OBJECTIVES: From a cohort of patients with community-acquired pneumonia (CAP) who required admission to hospital, to describe the subset of patients having a do not resuscitate (DNR) order and to compare them with those who did not have such an order. DESIGN: Retrospective subset analysis of data from the pneumonia patient outcomes research team study. SETTING: Three hospitals in the United States and one in Canada. PARTICIPANTS: Hospitalized patients aged 18 and older with CAP. MEASUREMENTS: Sociodemographic features, severity of illness, antibiotic therapy, length of stay, mortality, admission to special care units, and mortality attributable to pneumonia. RESULTS: The 199 (14.9) of 1,339 inpatients with CAP who had a DNR order written within 24 hours of admission and an additional 96 (7.2) patients who had such an order written later were compared with the 1,044 who never had a DNR order. The 199 patients with an initial DNR and 96 later DNR were older (median age 81 and 78 vs 65 years, respectively; P< .001), more likely to be white (92.5 and 90.6 vs 84.8; P = .007), and more likely to have come from a nursing home or chronic care facility (53.8 and 31.3 vs 4.5; P< .001). The two DNR groups received more antibiotics for a longer time than the never DNR patients. The DNR patients had longer lengths of stay than the never DNR patients (medians 9 and 12 vs 7 days). There were 89 in-hospital deaths among the 1,339 patients, but only 11 of these were among patients who did not have a DNR order during the first 30 days (sensitivity, specificity, and positive and negative predictive values of a DNR order for in-hospital mortality were 87.6, 82.6, 26.4, and 98.9, respectively). The 90-day mortality rates were 43.2 for the initial DNR group, 61.5 in the later DNR group, and 4.7 for the never DNR group (P< .001). Pneumonia-attributable mortality accounted for most of the in-hospital deaths but did not differ by DNR status. Only 31.7 of the initial DNR patients and 24.0 of the later DNR patients were discharged home, versus 82.6 of the other patients (P< .001). In a multivariate analysis, the following were predictive of initial DNR: age, nursing home care, active cancer, dementia, neuromuscular disorders, altered mental status, low systolic blood pressure, tachypnea, abnormal hematocrit, abnormal blood urea nitrogen, and absence of alcohol or intravenous drug abuse. In similar analyses of DNR at any time, additional predictors included aspiration, low white blood count, chronic pulmonary disease, cerebrovascular disease, and congestive heart failure. CONCLUSION: Most in-hospital pneumonia deaths occur in patients who have a DNR order. DNR orders written within 24 hours of admission primarily reflect comorbid status, whereas DNR orders written later during hospitalization reflect the futility of care plus comorbidity.

Adult↗