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Biomedical subjects

D W Bates

Publications and source records attributed to D W Bates.

At least 37 records · Page 2Linked to original sources

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↗

How can information technology improve patient safety and reduce medication errors in children's health care?

BACKGROUND: Medication errors are common, costly, and injurious to patients. OBJECTIVE: To review the role of information technology in decreasing pediatric medication errors in both inpatient and outpatient settings. DESIGN: We performed a literature review of current information technology interventions. RESULTS: Several types of information technology will likely reduce the frequency of medication errors, although insufficient data exists for many technologies, and most available data come from adult settings. Computerized physician order entry with decision support substantially decreases the frequency of serious inpatient medication errors in adults. Certain other inpatient information technologies may be beneficial even though less evidence is currently available. These include computerized medication administration records, robots, automated pharmacy systems, bar coding, "smart" intravenous devices, and computerized discharge prescriptions and instructions. In the outpatient setting, where adherence is especially important, personalized Web pages and World Wide Web-based information have substantial potential. CONCLUSIONS: Medication errors are an important problem in pediatrics. Information technology interventions have great potential for reducing the frequency of errors. The magnitude of benefits may be even greater in pediatrics than in adult medicine because of the need for weight-based dosing. Further development, application, evaluation, and dissemination of pediatric-specific information technology interventions are essential.

Adolescent↗

Blood pressure and angiotensin converting enzyme inhibitor use in hypertensive patients with chronic renal insufficiency.

BACKGROUND: Hypertension treatment is important in managing chronic renal insufficiency (CRI). Little is known, however, about the blood pressure (BP) control achieved or the pattern of antihypertensive drug prescription among CRI patients. METHODS: Using computerized medical records, we studied 3,089 adult hypertensive subjects treated at Brigham and Women's Hospital (Boston, MA) from 1990 through 1998. All subjects had at least two serum creatinine measurements 2 years apart, at least two BP readings, and online weight (to estimate Cockcroft-Gault creatinine clearance [CrCl]). RESULTS: The average mean arterial pressure over time (mean MAP) was 103 +/- 9 mm Hg among those with CrCI >60 mL/min, 102 t 9 mm Hg among those with CrCl 41 to 60 mL/min. and 101 +/- 9 mm Hg among those with CrCl 21 to 40 mL/min. There were no significant differences in mean MAP among the different categories of renal function in the multivariate analysis (P = .26 for trend). The proportion of patients with final systolic BP < 160 mm Hg and diastolic BP <90 mm Hg was 68% and did not vary with renal function (P = .68 for trend). The proportion of subjects who were prescribed ACE inhibitors was 38% among those with CrCl >60 mL/min, 36% among those with CrCI 41 to 60 mL/min, and only 27% among those with CrCl 21 to 40 mL/min (P = .003 for trend). CONCLUSIONS: The BP control achieved among hypertensive CRI subjects, although no worse than that among those without CRI, was found to be suboptimal. Patients with CrCl 21 to 40 mL/min were less likely to be prescribed ACE inhibitors than were those with CrCl >60 mL/min. Improvement is needed in the clinical management of these factors that can influence the progression of CRI.

Adult↗

Patient safety and computerized medication ordering at Brigham and Women's Hospital.

BACKGROUND: Medications are important therapeutic tools in health care, yet creating safe medication processes is challenging for many reasons. Computerized physician order entry (CPOE), one important way that technology can be used to improve the medication process, has been in place at Brigham and Women's Hospital (BWH; Boston) since 1993. CPOE AT BWH: The CPOE application, designed and developed internally by the BWH information systems team, allows physicians and other clinicians to enter all patient orders into the computer. Physicians enter 85% of orders, with the remainder entered electronically by other clinicians. CPOE AND SAFE MEDICATION USE: The CPOE application at BWH includes several features designed to improve medication safety--structural features (for example, required fields, use of pick lists), enhanced workflow features (order sets, standard scales for insulin and potassium), alerts and reminders (drug-drug and drug-allergy interaction checking), and adjunct features (the pharmacy system, access to online reference information). RESULTS AT BWH: Studies of the impact of CPOE on physician decision making and patient safety at BWH include assessment of CPOE's impact on the serious medication error and the preventable adverse drug event rate, the impact of computer guidelines on the use of vancomycin, the impact of guidelines on the use of heparin in patients at bed rest, and the impact of dosing suggestions on excessive dosing. CONCLUSION: CPOE and several forms of clinical decision support targeted at increasing patient safety have substantially decreased the frequency of serious medication errors and have had an even bigger impact on the overall medication error rate.

Clinical Pharmacy Information Systems↗

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↗

Correlates of acute renal failure in patients receiving parenteral amphotericin B.

BACKGROUND: While parenteral amphotericin B is an effective therapy for serious fungal infections, it frequently causes acute renal failure (ARF). This study identified correlates of ARF in amphotericin B therapy and used them to develop clinical prediction rules. METHODS: All 643 inpatients receiving parenteral amphotericin B therapy at one tertiary care hospital were included. Data regarding correlates were obtained both electronically and from manual chart review in a subsample of 231 patients. ARF was defined as a 50% increase in the baseline creatinine with a peak > or =2.0 mg/dL. RESULTS: Among 643 episodes, ARF developed in 175 (27%). In the larger group, the only independent correlate of ARF was male gender (OR = 2.2, 95% CI, 1.5 to 3.3). In the subsample (N = 231), independent correlates of ARF were maximum daily amphotericin dosage, location at the time of initiation of amphotericin therapy, and concomitant use of cyclosporine. These data were used to develop two clinical prediction rules. A rule using only data available at initiation of therapy stratified patients into groups with probability of ARF ranging from 15 to 54%, while a rule including data available during therapy (maximum daily dose) stratified patients into groups with probability of ARF ranging from 4 to 80%. CONCLUSIONS: Acute renal failure occurred in a quarter of the patients. Correlates of ARF at the beginning and during the course of amphotericin therapy were identified and then combined to allow stratification according to ARF risk. These data also provide evidence for guidelines for the selection of patients for alternative therapies.

Acute Kidney Injury↗

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↗

Using an electronic medical record to identify opportunities to improve compliance with cholesterol guidelines.

OBJECTIVE: To use an electronic medical record to measure rates of compliance with the National Cholesterol Education Program (NCEP) cholesterol guidelines for secondary prevention, to characterize the patterns of noncompliance, and to identify patient and physician-specific correlates of noncompliance. DESIGN: Cross-sectional descriptive analysis of data extracted from an electronic medical record. SETTING: Nineteen primary care clinics affiliated with a tertiary academic medical center. PATIENTS: All patients who visited their primary care physician in the preceding year who met criteria for secondary prevention of hypercholesterolemia. INTERVENTIONS: None. The main outcome was rate of compliance with NCEP cholesterol guidelines. MAIN RESULTS: Of 2,019 patients who qualified for secondary prevention, only 31% were in compliance with NCEP recommendations, although 44% were on lipid-lowering therapy. There was no low-density lipoprotein cholesterol (LDL-C) on record within the last three years for 771 (38%), and another 809 (40%) had a recent LDL-C that was above the recommended target of 100 mg/dL. Of the latter group, 374 (46%) were not on a statin, including 188 patients with an LDL-C >130 mg/dL. Compliance among secondary prevention patients with cerebrovascular or peripheral vascular disease, but not coronary disease, was even lower: 19% versus 36%, P <.0001. Most of the additional noncompliant patients never had an LDL-C checked. Patient-specific factors associated with compliance included having seen a cardiologist (45% vs 21%); having had a recent admission for myocardial infarction, unstable angina, or angina (41% vs 26%); being male (37% vs 24%); and being white (34% vs 26%). Patients over 79 and under 50 years old also were less likely to be compliant (22% vs 34% for 50-79 year olds). There were no significant differences in compliance rates based on physician-specific factors, such as level of training, gender, or panel size. CONCLUSION: We found poor compliance with nationally published and well-accepted guidelines on diagnosing and treating hypercholesterolemia in secondary prevention patients. Compliance was unrelated to physician or physician-specific characteristics, but it was especially low for women, African Americans, patients without a cardiologist, and patients with cerebrovascular and peripheral vascular disease.

Aged↗

Resource utilization of patients with hypochondriacal health anxiety and somatization.

OBJECTIVES: To examine the resource utilization of patients with high levels of somatization and health-related anxiety. DESIGN: Consecutive patients on randomly chosen days completed a self-report questionnaire assessing somatization and health-related, hypochondriacal anxiety. Their medical care utilization in the year preceding and following completion of the questionnaire was obtained from an automated patient record. The utilization of patients above and below a predetermined threshold on the questionnaire was then compared. PATIENTS AND SETTING: Eight hundred seventy-six patients attending a primary care clinic in a large, urban, teaching hospital. OUTCOME MEASURES: Number of ambulatory physician visits (primary care and specialist), outpatient costs (total, physician services, and laboratory procedures), proportion of patients hospitalized, and proportion of patients receiving emergency care. RESULTS: Patients in the uppermost 14% of the clinic population on somatization and hypochondriacal health anxiety had appreciably and significantly higher utilization in the year preceding and the year following completion of the somatization questionnaire than did the rest of the patients in the clinic. After adjusting for group differences in sociodemographic characteristics and medical comorbidity, significant differences in utilization remained. In the year preceding the assessment of somatization, their adjusted total outpatient costs were $1,312 (95% CI $1154, $1481) versus $954 (95% CI $868, $1057) for the remainder of the patients and the total number of physician visits was 9.21 (95% CI 7.94, 10.40) versus 6.33 (95% CI 5.87, 6.90). In the year following the assessment of somatization, those above the threshold had adjusted total outpatient costs of $1,395 (95% CI $1243, $1586) versus $1,145 (95% CI $1038, $1282), 9.8 total physician visits (95% CI 8.66, 11.07) versus 7.2 (95% CI 6.62, 7.77), and had a 24% (95% CI 19%, 30%) versus 17% (95% CI 14%, 20%) chance of being hospitalized. CONCLUSIONS: Primary care patients who somatize and have high levels of health-related anxiety have considerably higher medical care utilization than nonsomatizers in the year before and after being assessed. This differential persists after adjusting for differences in sociodemographic characteristics and medical morbidity.

Adult↗

Productivity, quality, and patient satisfaction: comparison of part-time and full-time primary care physicians.

CONTEXT: Although few data are available, many believe that part-time primary care physicians (PCPs) are less productive and provide lower quality care than full-time PCPs. Some insurers exclude part-time PCPs from their provider networks. OBJECTIVE: To compare productivity, quality of preventive care, patient satisfaction, and risk-adjusted resource utilization of part-time and full-time PCPs. DESIGN: Retrospective cohort study. SETTING: Boston. PARTICIPANTS: PCPs affiliated with 2 academic outpatient primary care networks. MEASUREMENTS: PCP productivity, patient satisfaction, resource utilization, and compliance with screening guidelines. RESULTS: Part-time PCP productivity was greater than that of full-time PCPs (2.1 work relative value units (RVUs)/bookable clinical hour versus 1.3 work RVUs/bookable clinical hour, P< .01). A similar proportion of part-time PCPs (80%) and full-time PCPs (75%) met targets for mammography, Pap smears, and cholesterol screening (P = .67). After adjusting for clinical case mix, practice location, gender, board certification status, and years in practice, resource utilization of part-time PCPs (138 dollars [95% confidence interval (CI), 108 dollars to 167 dollars]) was similar to that of full-time PCPs (139 dollars [95% CI, 108 dollars to 170 dollars], P = .92). Patient satisfaction was similar for part-time and full-time PCPs. CONCLUSIONS: In these academic primary care practices, rates of patient satisfaction, compliance with screening guidelines, and resource utilization were similar for part-time PCPs compared to full-time PCPs. Productivity per clinical hour was markedly higher for part-time PCPs. Despite study limitations, these data suggest that academic part-time PCPs are at least as efficient as full-time PCPs and that the quality of their work is similar.

Academic Medical Centers↗

Referrals for musculoskeletal disorders: patterns, predictors, and outcomes.

OBJECTIVE: To examine factors associated with musculoskeletal referral and determine whether referral influences clinical outcomes. METHODS: Patients included in the study presented with knee or shoulder pain to primary care physicians affiliated with an academic teaching hospital. The primary clinical outcome was change in pain or function measured up to 12 months after initial presentation. Covariates included baseline pain and function, duration of complaint, initial diagnosis, insurance status, and several demographic factors. RESULTS: Forty-one percent (65 of 160 patients) were referred for knee or shoulder conditions, 47 (29%) patients were referred only to an orthopedic surgeon, and 12 (8%) only to a rheumatologist; 6 (4%) patients saw both specialists. For patients with knee pain, the only variable correlated with referral was an initial diagnosis of internal derangement (p = 0.02). No variable was significantly associated with referral for shoulder pain. Baseline pain, baseline function, duration of complaint, age, and insurance status were not associated with referral for either knee or shoulder pain (all p values > 0.05). The variables most associated with improvement in pain and function were more severe pain and function at baseline (all p values < 0.0001). In multivariate analyses controlling for clinical and demographic factors among patients with shoulder complaints, referral was associated with significantly less improvement in clinical outcomes than non-referral (p = 0.02). Referral was not associated with clinical outcomes for patients with knee pain. CONCLUSIONS: Referral was common for patients with knee or shoulder conditions. The only baseline variable correlated with referral was a diagnosis of knee internal derangement. Referral was not associated with improvement in pain or function and may actually be correlated with worse outcomes among patients with shoulder pain, although this is likely due to unmeasured factors contributing to the referral decision.

Adult↗

Comparison of time spent writing orders on paper with computerized physician order entry.

Computerized physician order entry (CPOE) has been shown to improve quality, and to reduce resource utilization, but most available data suggest that it takes longer to enter orders using CPOE. We had previously implemented a CPOE system, and elected to evaluate its impact on physician time in the new setting. To do this, we performed a prospective study using random reminder methodology. Key findings were that interns spent 9.0% of their time ordering with CPOE, compared to 2.1% before, although CPOE saved them an additional 2% of time, so that the net difference was 5% of their total time. However, this is counterbalanced by decreased time for other personnel such as nursing and pharmacy, and by the quality and efficiency changes. We conclude that while CPOE has many benefits, it represents a major process change, and organizations must factor this in when they implement it.

Hospital Information Systems↗

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↗

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↗

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↗

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↗