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Biomedical subjects

D W Bates

Publications and source records attributed to D W Bates.

At least 19 recordsLinked to original sources
PubMed2001

Abdominal cross-sectional imaging for inpatients with abnormal liver function test results: yield and usefulness.

BACKGROUND: Abdominal cross-sectional imaging is often performed to evaluate abnormal liver function test (LFT) results in hospitalized patients. However, few data are available regarding the yield and usefulness of imaging inpatients for the indication of abnormal LFT results, the process of requesting abdominal imaging studies, or the response to their findings. METHODS: We retrospectively reviewed abdominal imaging scans that were obtained during a 27-month period. We matched the imaging studies done with the indication of abnormal LFT results; all scans were requested using computerized physician order entry. Reports were coded for interpretation and associated process step results. To determine the usefulness of the imaging studies, a random sample of patient charts with positively coded imaging studies were reviewed. Imaging examinations were considered useful if they provided new diagnostic information and/or changed subsequent patient care. RESULTS: Of 6494 abdominal imaging studies, 856 were performed for the indication of abnormal LFT results and matched to both image reports and laboratory results. Report coding judged 37% of interpretations as clinically significant, including 27% with "positive" (abnormal results and explain the abnormal LFT results) examinations. Among the positive examinations, the most common diagnoses were biliary obstruction (25%), cholecystitis (21%), malignancy (20%), and cirrhosis (14%). Positively coded reports provided new clinical information in 63% of these studies and changed patient care in 42% of cases. Process measures assessed provision of additional information to and from radiologists (69% and 8%, respectively) and the frequency with which the findings of current abdominal imaging studies were compared with those of prior studies (59%). CONCLUSION: Abdominal cross-sectional imaging studies performed on inpatients with abnormal LFT results had a high diagnostic yield and frequently changed patient care.

Abdomen↗
PubMed2001

Mortality and costs of acute renal failure associated with amphotericin B therapy.

To assess the mortality and resource utilization that results from acute renal failure associated with amphotericin B therapy, 707 adult admissions in which parenteral amphotericin B therapy was given were studied at a tertiary-care hospital. Main outcome measures were mortality, length of stay, and costs; we controlled for potential confounders, including age, sex, insurance status, baseline creatinine level, length of stay before beginning amphotericin B therapy, and severity of illness. Among 707 admissions, there were 212 episodes (30%) of acute renal failure. When renal failure developed, the mortality rate was much higher: 54% versus 16% (adjusted odds of death, 6.6). When acute renal failure occurred, the mean adjusted increase in length of stay was 8.2 days, and the adjusted total cost was $29,823. Although residual confounding exists despite adjustment, the increases in resource utilization that we found are large and the associated mortality is high when acute renal failure occurs following amphotericin B therapy.

Acute Kidney Injury↗
PubMed2001

Use and monitoring of "statin" lipid-lowering drugs compared with guidelines.

BACKGROUND: In patients with high cholesterol, 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (or "statins") have been shown to reduce overall mortality in primary and secondary prevention. The National Cholesterol Education Program expert panel's guidelines (Adult Treatment Panel II) recommend evaluation and treatment of high cholesterol based on stratification of patients according to cardiovascular risk. While evidence suggests that many patients are undertreated, comparatively few data are available regarding overtreatment. OBJECTIVES: To assess the appropriateness of statin therapy compared with national guidelines and to examine the appropriateness of monitoring for adverse effects. METHODS: For all patients at a tertiary medical center, electronic medical records were evaluated for presence or absence of statin use and for presence of established coronary heart disease or cardiac risk factors. Therapy was compared with the recommendations of the National Cholesterol Education Program guidelines. Our primary outcome measures included, for all patients taking statins, prevalence of appropriateness vs overuse, and for all patients with coronary heart disease, prevalence of appropriateness vs underuse. RESULTS: Overuse of statin therapy was found among 69% of patients undergoing primary prevention, and among 47% of patients undergoing secondary prevention. In addition, among patients with coronary heart disease who were not taking statins, 88% were undertreated. Monitoring of liver function varied widely, and did not correlate with the risk of adverse events secondary to statin use. CONCLUSIONS: Overtreatment and undertreatment for hyperlipidemia were frequent. Decision support may help physicians improve their performance compared with guidelines.

Adult↗
PubMed2001

A computerized method for identifying incidents associated with adverse drug events in outpatients.

INTRODUCTION: In inpatients, computer monitors have been used to improve the detection of adverse drug events (ADEs). However, similar programs have not been available in outpatients. OBJECTIVE: To describe an approach for detecting incidents suggesting that an ADE may have occurred in outpatients by adapting methods from inpatient computer monitoring and developing terminology searches of electronic medical records. METHODS: One year of information from the outpatient electronic medical record (EMR) at one hospital and its clinics was reviewed. Altogether, 23064 patients and 88514 visits were identified. Patient demographics, medical problem lists, ICD-9 claims, patient allergies, medication history and all clinic visit notes were extracted and merged. We then searched for incidents suggesting that an ADE might be present using four methods: ICD-9 claims, new allergies, computer rules linking laboratory data to known medication exposures, and a medical terminology lexicon (M2D2). In this report, we describe how these search methods were developed to allow for ADE identification. CONCLUSION: The ability to carry out such quality-related work is an example of the benefits of the outpatient EMR that may not be apparent to those institutions considering adopting it.

Adverse Drug Reaction Reporting Systems↗
PubMed2001

Relationship between hematocrit and renal function in men and women.

BACKGROUND: Anemia is a known complication of renal insufficiency, but the relationship between level of renal function and magnitude of reduction in hematocrit is not well defined. Men have higher hematocrit and absolute glomerular filtration rate (GFR) than women; however, it is unknown whether the level of clearance associated with decreased hematocrit is the same in men and women. METHODS: We conducted a cross-sectional study of 12,055 adult ambulatory patients. General linear models were used to analyze the relationship between hematocrit and Cockcroft-Gault equation estimated creatinine clearance (C(Cr); mL/min) and Modification of Diet in Renal Disease (MDRD) formula estimated the GFR indexed to body surface area (mL/min/1.73 m(2)). RESULTS: The hematocrit decreased progressively below estimated C(Cr) 60 mL/min in men and 40 mL/min in women. Compared with subjects with C(Cr)> 80 mL/min, men with C(Cr) 60 to 50 mL/min, 50 to 40 mL/min, 40 to 30 mL/min, 30 to 20 mL/min, and < or =20 mL/min had mean hematocrits that were lower by 1.0, 2.4, 3.7, 3.5, and 10.0%, respectively; the corresponding reductions in women with C(Cr) 40 to 30 mL/min, 30 to 20 mL/min, and < or =20 mL/min were 1.7, 2.9, and 6.3% (all P < 0.05). This between-sex difference diminished when renal function measurement was indexed to body size. Compared with subjects with GFR> 80 mL/min/1.73 m(2), men with GFR 50 to 40 mL/min/1.73 m(2), 40 to 30 mL/min/1.73 m(2), 30 to 20 mL/min/1.73 m(2), and < or =20 mL/min/1.73 m(2) had mean hematocrits that were lower by 2.0, 4.4, 5.3, and 9.4%; the corresponding reductions in women with GFR 50 to 40 mL/min/1.73 m(2), 40 to 30 mL/min/1.73 m(2), 30 to 20 mL/min/1.73 m(2) and < or =20 mL/min/1.73 m(2) were 0.6, 1.6, 3.8, and 5.3% (all P < 0.05). CONCLUSIONS: A decrease in hematocrit is apparent even among patients with mild to moderate renal insufficiency. At any given level of renal function below estimated C(Cr) 60 mL/min, men have a larger decrease in hematocrit than women.

Adult↗
PubMed2000

Preventable medical injuries in older patients.

Injuries associated with hospitalization are more common in older (>/=65 years) than in younger patients (<65 years), and they may be more severe and more often preventable. The increasing age of the population magnifies the importance of this problem. In this review, we first consider medical injuries in general and then review the literature for 6 categories: adverse drug events, falls, nosocomial infections, pressure sores, delirium, and surgical and perioperative complications. For each of these categories, older patients appear to be at higher risk, ranging from a 2.2-fold increase for perioperative complications to a 10-fold increase for falling, based on Harvard Medical Practice Study rates. The main cause of these increased risks appears to be the diminished physiological reserve of elderly patients; however, age alone is a less important predictor of adverse events than comorbidities and functional status. Furthermore, many of these complications appear to be preventable, although the proportion preventable varies by type of complication. While some prevention strategies are specifically beneficial in older patients, many apply to all age groups. Geriatric care units and consultation systems have improved outcomes in some instances, although the data are mixed. The success of intervention varies by type of complications. For medications, various interventions have been successful, and fall prevention programs have been demonstrated to be effective in the nursing home and home.

Accidental Falls↗
PubMed2000

Effects of computerized physician order entry on prescribing practices.

BACKGROUND: Computerized order entry systems have the potential to prevent errors, to improve quality of care, and to reduce costs by providing feedback and suggestions to the physician as each order is entered. This study assesses the impact of an inpatient computerized physician order entry system on prescribing practices. METHODS: A time series analysis was performed at an urban academic medical center at which all adult inpatient orders are entered through a computerized system. When physicians enter drug orders, the computer displays drug use guidelines, offers relevant alternatives, and suggests appropriate doses and frequencies. RESULT: For medication selection, use of a computerized guideline resulted in a change in use of the recommended drug (nizatidine) from 15.6% of all histamine(2)-blocker orders to 81.3% (P<.001). Implementation of dose selection menus resulted in a decrease in the SD of drug doses by 11% (P<.001). The proportion of doses that exceeded the recommended maximum decreased from 2.1% before order entry to 0.6% afterward (P<.001). Display of a recommended frequency for ondansetron hydrochloride administration resulted in an increase in the use of the approved frequency from 6% of all ondansetron orders to 75% (P<.001). The use of subcutaneous heparin sodium to prevent thrombosis in patients at bed rest increased from 24% to 47% when the computer suggested this option (P<.001). All these changes persisted at 1- and 2-year follow-up analyses. CONCLUSION: Computerized physician order entry is a powerful and effective tool for improving physician prescribing practices.

Decision Support Systems, Clinical↗
PubMed2000

Incidence and preventability of adverse drug events in nursing homes.

PURPOSE: Adverse drug events, especially those that may have been preventable, are among the most serious concerns about medication use in nursing homes. We studied the incidence and preventability of adverse drug events and potential adverse drug events in nursing homes. METHODS: We performed a cohort study of all long-term care residents of 18 community-based nursing homes in Massachusetts during a 12-month observation period. Potential drug-related incidents were detected by stimulated self-report by nursing home staff and by periodic review of the records of nursing home residents by trained nurse and pharmacist investigators. Each incident was classified by 2 independent physician-reviewers, using a structured implicit review process, by whether or not it constituted an adverse drug event or potential adverse drug event (those that may have caused harm, but did not because of chance or because they were detected), by the severity of the event (significant, serious, life-threatening, or fatal), and by whether it was preventable. Examples of significant events included nonurticarial rashes, falls without associated fracture, hemorrhage not requiring transfusion or hospitalization, and oversedation; examples of serious events included urticaria, falls with fracture, hemorrhage requiring transfusion or hospitalization, and delirium. RESULTS: During 28,839 nursing home resident-months of observation in the 18 participating nursing homes, 546 adverse drug events (1.89 per 100 resident-months) and 188 potential adverse drug events (0.65 per 100 resident-months) were identified. Of the adverse drug events, 1 was fatal, 31 (6%) were life-threatening, 206 (38%) were serious, and 308 (56%) were significant. Overall, 51% of the adverse drug events were judged to be preventable, including 171 (72%) of the 238 fatal, life-threatening, or serious events and 105 (34%) of the 308 significant events (P < 0.001). Errors resulting in preventable adverse drug events occurred most often at the stages of ordering and monitoring; errors in transcription, dispensing, and administration were less commonly identified. Psychoactive medications (antipsychotics, antidepressants, and sedatives/hypnotics) and anticoagulants were the most common medications associated with preventable adverse drug events. Neuropsychiatric events were the most common types of preventable adverse drug events. CONCLUSIONS: Adverse drug events are common and often preventable in nursing homes. More serious adverse drug events are more likely to be preventable. Prevention strategies should target the ordering and monitoring stages of pharmaceutical care.

Accidental Falls↗
PubMed2000

The use of information technology in improving medical performance. Part III. Patient-support tools.

Despite the proliferation of computer-based resources for patients, usefulness has been limited to date. Already, 17,000 biomedical Internet sites exist, and patients are increasingly finding support and knowledge on the Internet, but the accuracy of the information found is highly variable and difficult for patients to assess. Patients have also found value in electronic communication with physicians, although relatively few physicians routinely use email to communicate with patients on a regular basis. Nonetheless, patient-focused information technologies potentially will have profound effects on medical care. With advancing sophistication of technology, patients will increasingly be able to compare and choose doctors using the Internet and to access information that allows them to monitor and regulate the quality of their own care. Further, technologies will likely be developed to allow patients to increasingly manage their own care -- whether they are patients with chronic illnesses such as diabetes or congestive heart failure who use customized software to adjust drug dosages and other treatments or patients with such common illnesses as headache or gastrointestinal infection who access self-management programs that may even write prescriptions for them. Thoughtful analysis and policy development will be critical for ensuring that the benefits are maximized and potential harm minimized. Specific areas include assessing the effects on outcomes and the characteristics of patients and technologies that succeed with self-management, and developing policies regarding liability for Web-based medical transactions and the privacy of information provided to physicians by email and via interactive Web sites.

Biomedical Technology↗
PubMed2000

The use of information technology in improving medical performance. Part II. Physician-support tools.

Increasing data from a few sites demonstrate that information technologies can improve physician decision making and clinical effectiveness. For example, computer-based physician order entry systems, automated laboratory alert systems, and artificial neural networks have demonstrated significant reductions in medical errors. In addition, Internet services to disseminate new knowledge and safety alerts to physicians more rationally and effectively are rapidly developing, and telemedicine to improve rural access to specialty services is undergoing substantial growth. However, even technologies demonstrated to yield beneficial effects have not yet achieved widespread adoption, though the pace of change appears to be increasing as the Internet takes hold. Scientific evaluation of many technologies is also lacking, and the dangers of some of these technologies may be underappreciated. Research on the effects of specific technologies should be a priority. Policies should be developed to press information technology companies, such as pharmaceutical and medical device manufacturers, to recognize the importance of clinical evaluation. Research could also analyze the characteristics of effective technologies and of physicians and organizations who implement these technologies effectively.

Biomedical Technology↗
PubMed2000

The use of information technology in improving medical performance. Part I. Information systems for medical transactions.

Investment in medical information technologies reached $15 billion in 1996. However, these technologies have not had the wide impact predicted in streamlining bureaucracy, improving communications, and raising the effectiveness of care. In this series, we identify how such technologies are being used to improve quality and performance, the future directions for advancement, and the policy and research developments required to maximize public benefit from these technologies. Each of these articles focuses on a different type of information technology: (1) information systems to manage medical transactions; (2) physician-support technologies to improve medical practice; and (3) patient-focused technologies designed to change how people manage their own care. This first article of a 3-part series examines the successes of and opportunities for using advanced information systems that track and manage medical transactions for large populations to improve performance. Examples of such systems include: HEDIS, which gathers standardized data from health plans on quality of care; the USQA Health Services Research Program, which tracks treatment patterns and outcomes for 14 million insurance members; Ford's program to collect medical data for over 600,000 employees; and Harvard Pilgrim Health Care's system of computerized laboratory, pharmacy, ambulatory, and hospital admission records for its 1.5 million members. Data from these systems have led to modest improvements in knowledge and practice patterns for some diseases. Significant barriers are slowing efforts to add outcomes data to these databases and broaden the databases to cover larger populations. Nonetheless, existing data in currently evolving systems could be used to greater benefit in tracking public health and in identifying more effective treatments and causes of diseases.

Biomedical Technology↗
PubMed2000

Outcomes of care and resource utilization among patients with knee or shoulder disorders treated by general internists, rheumatologists, or orthopedic surgeons.

PURPOSE: Previous studies have suggested that specialists may achieve better clinical outcomes for patients, albeit often at greater cost. We sought to compare outcomes of care and resource utilization among patients with shoulder or knee problems who were treated by general internists, rheumatologists, and orthopedic surgeons. SUBJECTS AND METHODS: Outpatients with knee or shoulder complaints who were seen by general internists, rheumatologists, or orthopedic surgeons at an academic medical center were administered questionnaires at enrollment in the study and again 3 months later. The questionnaires included validated measures of satisfaction, functional status, and pain severity, as well as resource utilization. We compared baseline clinical characteristics, satisfaction with care, resource utilization, and changes in function and symptoms during 3 months of follow-up among patients who were cared for by the three different types of providers. RESULTS: A total of 534 patients responded to the baseline survey and 436 (82%) to the 3-month follow-up survey. About 60% (n = 323) had knee pain. Orthopedists cared for 40% (n = 211) of the patients, with the remainder treated in approximately equal numbers by general internists or rheumatologists. At baseline, patients of internists had less severe pain (differences of 0.3 to 0.6 points on a 1 to 5 scale, P <0.05) and functional limitations (differences of 0.4 to 0.6 points on a 1 to 5 scale, P <0.0006) than patients of rheumatologists and orthopedic surgeons. Adjusting for baseline differences, there were no significant differences among provider groups in pain relief or functional improvement during follow-up. However, in adjusted analyses, patients with shoulder pain who were cared for by orthopedic surgeons were least satisfied with the office environment [adjusted mean (+/- SD) satisfaction score of 1.6 +/- 0.8 on a 1 to 4 scale for orthopedic surgeons vs 1.3 +/- 0.8 for rheumatologists and 1.4 +/- 0.8 for internists, P = 0.004]. Among patients with knee pain, those treated by rheumatologists and orthopedic surgeons were more satisfied with the doctor-patient interaction (adjusted mean satisfaction scores of 1.1 +/- 0.9 for rheumatologists and 1.2 +/- 0.7 for orthopedic surgeons on a 1 to 4 scale vs 1.4 +/- 0.8 for general internists, P = 0.003). Orthopedic surgeons obtained significantly more radiographs of the knee or shoulder and more magnetic resonance imaging scans of the knee. Rheumatologists performed significantly more aspirations or injection procedures. Among all patients, those treated by rheumatologists were most satisfied with the physician interaction, and those treated by orthopedic surgeons were most satisfied with treatment results. CONCLUSION: The relative benefits of specialist compared with generalist care for patients with knee or shoulder pain depend on the importance attached to resource utilization, patient satisfaction, and health outcomes.

Academic Medical Centers↗
PubMed2000

Predicting acute renal failure after coronary bypass surgery: cross-validation of two risk-stratification algorithms.

BACKGROUND: Acute renal failure (ARF) requiring dialysis after coronary artery bypass grafting (CABG) occurs in 1 to 5% of patients and is independently associated with postoperative mortality, even after case-mix adjustment. A risk-stratification algorithm that could reliably identify patients at increased risk of ARF could help improve outcomes. METHODS: To assess the validity and generalizability of a previously published preoperative renal risk-stratification algorithm, we analyzed data from the Quality Measurement and Management Initiative (QMMI)1 patient cohort. The QMMI includes all adult patients (N = 9498) who underwent CABG at 1 of 12 academic tertiary care hospitals from August 1993 to October 1995. ARF requiring dialysis was the outcome of interest. Cross-validation of a recursive partitioning algorithm developed from the VA Continuous Improvement in Cardiac Surgery Program (CICSP) was performed on the QMMI. An additive severity score derived from logistic regression was also cross-validated on the QMMI. RESULTS: The CICSP recursive partitioning algorithm discriminated well (ARF vs. no ARF) in QMMI patients, even though the QMMI cohort was more diverse. Rates of ARF were similar among risk subgroups in the CICSP tree, as was the overall ranking of subgroups by risk. Using logistic regression, independent predictors of ARF in the QMMI cohort were similar to those found in the CICSP. The CICSP additive severity score performed well in the QMMI cohort, successfully stratifying patients into low-, medium-, high-, and very high-risk groups. CONCLUSIONS: The CICSP preoperative renal-risk algorithms are valid and generalizable across diverse populations.

Acute Kidney Injury↗
PubMed2000

Drug complications in outpatients.

OBJECTIVE: Outpatient drug complications have not been well studied. We sought to assess the incidence and characteristics of outpatient drug complications, identify their clinical and nonclinical correlates, and evaluate their impact on patient satisfaction. DESIGN: Retrospective chart reviews and patient surveys. SETTING: Eleven Boston-area ambulatory clinics. PATIENTS: We randomly selected 2,248 outpatients, 20 to 75 years old. MEASUREMENTS AND MAIN RESULTS: Among 2,248 patients reporting prescription drug use, 394 (18%) reported a drug complication. In contrast, chart review revealed an adverse drug event in only 64 patients (3%). In univariate analyses, significant correlates of patient-reported drug complications were number of medical problems, number of medications, renal disease, failure to explain side effects before treatment, lower medication compliance, and primary language other than English or Spanish. In multivariate analysis, independent correlates were number of medical problems (odds ratio [OR] 1.17; 95% confidence interval [95% CI] 1.05 to 1.30), failure to explain side effects (OR 1.65; 95% CI, 1.16 to 2.35), and primary language other than English or Spanish (OR 1.40; 95% CI, 1.01 to 1.95). Patient satisfaction was lower among patients who reported drug complications (P <.0001). In addition, 48% of those reporting drug complications sought medical attention and 49% experienced worry or discomfort. On chart review, 3 (5%) of the patients with an adverse drug event required hospitalization and 8 (13%) had a documented previous reaction to the causative drug. CONCLUSIONS: Drug complications in the ambulatory setting were common, although most were not documented in the medical record. These complications increased use of the medical system and correlated with dissatisfaction with care. Our results indicate a need for better communication about potential side effects of medications, especially for patients with multiple medical problems.

Adult↗
PubMed2000

Communication breakdown in the outpatient referral process.

OBJECTIVE: To evaluate primary care and specialist physicians' satisfaction with interphysician communication and to identify the major problems in the current referral process. DESIGN: Surveys were mailed to providers to determine satisfaction with the referral process; then patient-specific surveys were e-mailed to this group to obtain real-time referral information. SETTING: Academic tertiary care medical center. PARTICIPANTS: Attending-level primary care physicians (PCPs) and specialists. MEASUREMENTS AND MAIN RESULTS: The response rate for mail surveys for PCPs was 57% and for specialists was 51%. In the mail survey, 63% of PCPs and 35% of specialists were dissatisfied with the current referral process. Respondents felt that major problems with the current referral system were lack of timeliness of information and inadequate referral letter content. Information considered important by recipient groups was often not included in letters that were sent. The response rate for the referral specific e-mail surveys was 56% for PCPs and 53% for specialists. In this e-mail survey, 68% of specialists reported that they received no information from the PCP prior to specific referral visits, and 38% of these said that this information would have been helpful. In addition, four weeks after specific referral visits, 25% of PCPs had still not received any information from specialists. CONCLUSIONS: Substantial problems were present in the referral process. The major issues were physician dissatisfaction, lack of timeliness, and inadequate content of interphysician communication. Information obtained from the general survey and referral-specific survey was congruent. Efforts to improve the referral system could improve both physician satisfaction and quality of patient care.

Ambulatory Care↗