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Biomedical subjects

T S Lesar

Publications and source records attributed to T S Lesar.

At least 19 recordsLinked to original sources
PubMed1999

Antiretroviral medication errors for patients with HIV infection.

Errors in prescribing antiretroviral agents for patients with HIV infection may lead to treatment failure, drug resistance, or drug toxicity. Several published reports describe such errors, which appear to be related to a lack of knowledge, inexperience, complexities of the antiretroviral regimens, and sound-alike and look-alike names. Clinicians caring for patients with HIV infection should be aware of the potential for prescribing errors and develop strategies to prevent them.

Anti-HIV Agents↗
PubMed1998

Errors in the use of medication dosage equations.

BACKGROUND: Calculation errors in prescribing are a well-recognized problem; however, no systematic studies of actual errors involving calculation or other errors in the use of drug dosage equations are available. OBJECTIVE: To characterize the nature and potential adverse consequences of actual prescribing errors involving dosage equations. DESIGN: Analysis of the characteristics of 200 consecutive prescribing errors with potentially adverse outcomes involving dosage equations. SETTING: Tertiary care teaching hospital. MEASUREMENTS: Potential adverse outcomes, prescribing service, medication class, and the process point at which the error was made. RESULTS: Errors most commonly involved children (69.5%) and antibiotics (53.5%). Forty-two percent of errors were considered to put the patient at risk for a serious or severe preventable adverse outcome. Errors in decimal point placement, mathematical calculation, or expression of dosage regimen accounted for 59.5% of dosage errors. The dosage equation was wrong in 29.5% of dosage errors. CONCLUSIONS: The use of equations to determine medication dosages presents considerable risk to patients for errant dosing and subsequent adverse events or therapeutic failure. Errors may occur in any component of a dosage equation. Health care organizations should implement procedures to reduce the risk for errors resulting from the use of dosage equations.

Adolescent↗
PubMed1997

Medication-prescribing errors in a teaching hospital. A 9-year experience.

BACKGROUND: Improved understanding of medication prescribing errors should be useful in the design of error prevention strategies. OBJECTIVE: To report analysis of a 9-year experience with a systematic program of detecting, recording, and evaluating medication-prescribing errors in a teaching hospital. METHODS: All medication-prescribing errors with potential for adverse patient outcome detected and averted by staff pharmacists from January 1, 1987, through December 31, 1995, were systematically recorded and analyzed. Errors were evaluated by type of error, medication class involved, prescribing service, potential severity, time of day, and month. Data were analyzed to determine changes in medication-prescribing error frequency and characteristics occurring during the 9-year study period. RESULTS: A total of 11,186 confirmed medication-prescribing errors with potential for adverse patient consequences were detected and averted during the study period. The annual number of errors detected increased from 522 in the index year 1987 to 2115 in 1995. The rate of errors occurring per order written, per admission, and per patient-day, all increased significantly during the study duration (P < .001). Increased error rates were correlated with the number of admissions (P < .001). Antimicrobials, cardiovascular agents, gastrointestinal agents, and narcotics were the most common medication classes involved in errors. The most common type of errors were dosing errors, prescribing medications to which the patient was allergic, and prescribing inappropriate dosage forms. CONCLUSIONS: The results of this study suggest there may exist a progressively increasing risk of adverse drug events for hospitalized patients. The increased rate of errors is possibly associated with increases in the intensity of medical care and use of drug therapy. Limited changes in the characteristics of prescribing errors occurred, as similar type errors were found to be repeated with increasing frequency. New errors were encountered as new drug therapies were introduced. Health care practitioners and health care systems must incorporate adequate error reduction, prevention, and detection mechanisms into the routine provision of care.

Drug Prescriptions↗
PubMed1997

Comparison of programs for preventing drug-nutrient interactions in hospitalized patients.

Three programs with different levels of pharmacist intervention designed to prevent drug-nutrient interactions (DNIs) were studied. Six drugs were selected for the study on the basis of their potential for involvement in significant DNIs and the hospital's drug-use profile. During a two-week control phase, the existing pharmacy system, in which no patient-specific information on DNIs is provided, was assessed. During the next four weeks, patients were randomly assigned to intervention 1, placement of a brightly colored label in the medication drawer and on the cover of the nursing medication card flip-chart, or to intervention 2, placement of the labels plus a five-minute structured patient-counseling session. Occurrence of DNIs and nurses' and patients' knowledge of DNIs were assessed. A DNI was defined as potentially altered drug absorption due to inappropriate timing or administration of a drug in relation to food. The occurrence of DNIs decreased significantly under the label system (from 24% to 19%) and under the combined label-counseling system (to 16%). However, the frequency of DNIs did not differ significantly between the two intervention groups. Patients' and nurses' knowledge of DNIs improved as a result of the interventions. The frequency of DNIs decreased when labels were used to alert nurses to proper medication timing.

Adult↗
PubMed1996

Survey of antibiotic control policies in university-affiliated teaching institutions.

OBJECTIVE: To determine the type and extent of antibiotic control policies currently in use in a group of university-affiliated teaching institutions. DESIGN: A survey of antibiotic control policies and procedures (e.g., antibiotic order sheets, formulary restrictions, automatic stop orders for specific indications) was developed. SETTING: The University Hospital Consortium (UHC), a nonprofit group of academic health centers located in 33 states throughout the US. PARTICIPANTS: The survey was mailed to 60 UHC members. RESULTS: The survey was returned by 48 (80%) institutions. Most hospitals use either restrictions (81%) and/or official recommendations (56%) to manage antibiotic use. Antibiotics were restricted most commonly by service or unit (69%), indication (69%), or to the infectious disease service (60%). Antibiotic order sheets are used in 21 (44%) of the hospitals, of which 14 require completion by the prescriber. Monitoring of compliance with established restrictions is primarily the responsibility of the pharmacist processing the order (84%) and/or a clinical pharmacist (53%). When an order does not comply with restrictions or compliance cannot be determined, the prescriber is contacted prior to dispensing in 77% and 83% of the cases, respectively. In cases of noncompliance in which the prescriber refuses to alter an order to meet restrictions, 40% of hospitals refuse to dispense the drug and 35% dispense the drug but refer the case to another authority (infectious disease service or pharmacy and therapeutics committee). CONCLUSIONS: Considering the widespread use of antibiotic control programs, further investigation of the success of such programs in optimizing drug therapy, improving patient outcome, and cutailing the antibiotic budget within and among specific institutions is warranted.

Anti-Bacterial Agents↗
PubMed1995

Dosing adjustment of 10 antimicrobials for patients with renal impairment.

OBJECTIVE: To describe a program of creatinine clearance-based dosage adjustment of 10 renally eliminated antimicrobial agents and to discuss the utility of such a program in a hospital as a method of quality assurance (by ensuring that patients with renal impairment receive generally accepted dosage adjustments), based on pharmacodynamic principles. METHODS: Consecutive patients prescribed any of 10 targeted renally eliminated antibiotics were included. Recommendations for dosage adjustment were made to the prescriber based on a calculated creatinine clearance. Additional adjustments in drug therapy were performed, including dosage recommendations of nontargeted drugs, simplification of antibiotic regimens, and conversion of intravenous to oral therapy. A cost analysis was performed. RESULTS: During a 6-month study period, 160 dosage changes (7.6% of total number screened) were recommended in 137 patients receiving the targeted antimicrobial agents. Prescribers accepted 147 recommendations (91.9%). A dosage change recommendation was necessary more than 12% of the time for acyclovir, ceftazidime, and imipenem/cilastatin. A cost avoidance of $11,702.08 was realized. Ancillary drug recommendations that were offered and accepted during the program realized a cost avoidance of $6613.75. CONCLUSIONS: This dosage adjustment program using pharmacodynamic principles was successful in optimization of dosing, potential minimization of morbidity caused by excessive dosing, and demonstration of direct and potentially indirect cost avoidance. A dosing program for patients with renal impairment would be of benefit to other clinicians and institutions seeking to optimize patient care.

Adult↗
PubMed1994

Accuracy of penicillin allergy reporting.

The consistency of penicillin allergy documentation in the patient chart, pharmacy profile, and medication administration record was assessed, along with the correctness of the self-reported patient history of penicillin allergy. One hundred fifty adult inpatients with a reported penicillin allergy were interviewed about their allergy. Questions included length of time since the allergic reaction, symptoms of the reaction, and whether rechallenge was ever attempted. Patients were classified into categories of (1) more severe allergy, (2) less severe allergy, or (3) intolerance on the basis of results of the interview. The patient pharmacy profile, chart, and medication administration record were reviewed to determine whether the allergy label was present. Patients who received antimicrobials during their hospitalization were evaluated. Of 117 patients, 82.9% were classified as allergic and 17.1% as intolerant. The allergy was documented in 98.7% of patient charts and 96.7% of medication administration records. The symptoms of the allergic reaction were described in the chart for only 34% of patients. Agents substituted for penicillin were potentially more toxic in 70.4% of cases, equally effective in all cases, and more costly in 55.5% of cases. Most, but not all, patients labeled as penicillin allergic had a history consistent with an allergy to the drug. Pharmacists can help ensure accurate allergy documentation by evaluating patients and educating both patients and health care professionals.

Adolescent↗
PubMed1994

Standardized dosing tables to reduce errors involving high-dose methylprednisolone for acute spinal cord injury.

High-dose methylprednisolone administered after spinal cord injury improves neurologic recovery. Repeated errors in the prescribing and administration of the recommended regimen occurred in a regional trauma center. Standardized dosage tables for high-dose methylprednisolone were developed for prescribers, nurses, and pharmacists. Verification of ordered doses by pharmacists is critical in assuring appropriate use of this regimen. All institutions are urged to develop standard procedures for ordering, preparing, and administering high-dose methylprednisolone for acute spinal cord injury.

Dose-Response Relationship, Drug↗
PubMed1991

Preventing medication prescribing errors.

Medication errors may arise in the manufacture, preparation, distribution, and administration of drugs. Physician prescribing errors are of particular importance as such errors have been associated with significant adverse patient outcomes. The pharmacist plays an important role in preventing such errors from reaching the patient. The purpose of this article is to define and illustrate the various error types and the mental attitudes that cause individuals to prescribe errant orders. Through better understanding of the cause of prescribing errors, pharmacists may be able to improve the error prevention services they provide. Based on the error types discussed and their causes, recommendations are proposed to decrease the frequency of such errors and thereby improve the quality of patient care.

Drug Prescriptions↗
PubMed1990

Medication prescribing errors in a teaching hospital.

A study of prescribing errors committed by physicians that occurred in a tertiary-care teaching hospital is reported. From a total of 289 411 medication orders written during the 1-year study period, 905 prescribing errors were detected and averted, of which 522 (57.7%) were rated as having potential for adverse consequences. The overall detected error rate was 3.13 errors for each 1000 orders written and a rate of 1.81 significant errors per 1000 orders. The error rate (4.01 per 1000 orders) was greatest between 12 pm and 3:59 pm. First-year postgraduate residents were found to have a higher error rate (4.25 per 1000 orders) than other prescriber classes, and obstetrics/gynecology services (3.54 per 1000 orders) and surgery/anesthesia services (3.42 per 1000 orders) had greater error rates than other services. The study results demonstrate the significant risk to patients from medication prescribing errors. Educational, operational, and risk-management activities should include efforts directed at reducing the risk to patients from prescribing errors.

Hospital Bed Capacity, 500 and over↗
PubMed1990

Lindane (Kwell)-induced aplastic anemia.

Numerous toxic exposures have been implicated in causing aplastic anemia. Thirteen cases of aplastic anemia and 5 cases of other blood dyscrasias, eg, red blood cell aplasia and thrombocytopenia, associated with lindane, have been reported in the literature. However, aplastic anemia secondary to the scabicidal product (lindane [Kwell]) has not been documented, to our knowledge. We present the case of a 21-year-old man with a diagnosis of aplastic anemia, known prolonged exposure to lindane, and documented elevated serum lindane levels. His clinical course is described as well as various defects are explored for the aplasia.

Administration, Topical↗
PubMed1989

Plasma fluorescein and fluorescein glucuronide in patients with selected eye diseases.

Systemically administered fluorescein (F) is rapidly transformed to the fluorescent metabolite fluorescein glucuronide (FG). Little is known about how diseases can influence the synthesis or disposition of FG. We studied F and FG in the plasma ultrafiltrate of 75 people who were normal or had diabetes, retinitis pigmentosa, or idiopathic rhegmatogenous retinal detachment. F and FG were determined by high-performance liquid chromatography. The concentration of FG was comparable to F 1 h after an intravenous injection of F, both in normal subjects and in patients with retinitis pigmentosa, which suggests that FG may not be an important contributor to the vitreous fluorescence at that time. At later times FG substantially exceeded F. The concentration of FG was significantly higher in diabetics than in the other groups 14 h after an oral dose of F. Accordingly, the possible effect of disease on plasma dye concentrations should be considered in studies measuring F by fluorescence hours after systemic F administration, since this could influence the intraocular fluorescence irrespective of any alteration in ocular function.

Adult↗