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Biomedical subjects

Brian C Lund

Publications and source records attributed to Brian C Lund.

At least 19 recordsLinked to original sources

The Anticholinergic Drug Scale as a measure of drug-related anticholinergic burden: associations with serum anticholinergic activity.

Anticholinergic Drug Scale (ADS) scores were previously associated with serum anticholinergic activity (SAA) in a pilot study. To replicate these results, the association between ADS scores and SAA was determined using simple linear regression in subjects from a study of delirium in 201 long-term care facility residents who were not included in the pilot study. Simple and multiple linear regression models were then used to determine whether the ADS could be modified to more effectively predict SAA in all 297 subjects. In the replication analysis, ADS scores were significantly associated with SAA (R2 = .0947, P < .0001). In the modification analysis, each model significantly predicted SAA, including ADS scores (R2 = .0741, P < .0001). The modifications examined did not appear useful in optimizing the ADS. This study replicated findings on the association of the ADS with SAA. Future work will determine whether the ADS is clinically useful for preventing anticholinergic adverse effects.

Aged↗

Weight gain associated with the -759C/T polymorphism of the 5HT2C receptor and olanzapine.

BACKGROUND: Weight gain from atypical antipsychotic use has become a significant problem. Recent reports have liked the -759 polymorphism of the 5HT2C receptor and obesity as well as weight gain from chlorpromazine, risperidone, and clozapine. AIM: To determine associations between weight gain during olanzapine treatment and the -759C/T polymorphism of the 5HT2C receptor gene. METHODS: This study included 42 acutely ill patients with schizophrenia (DSM-IV). Weekly assessments included Brief Psychiatric Rating Scale (BPRS), Scale for Assessment of Negative Symptoms (SANS), and weight measurements. Olanzapine was titrated to a fixed dose (7.5-20 mg/day) for 2-6 weeks. A 24 hr plasma level was obtained at the endpoint visit. Genomic DNA was isolated from a whole blood sample and analyzed for the -759C/T polymorphism of the 5HT2C receptor. RESULTS: A chi-square analysis was conducted comparing the distribution of T and C alleles in subjects grouped as gaining more or less than 5, 7, and 10% of their baseline weight during treatment with olanzapine. A threshold of 10% was found to be significant. The distribution of T alleles was higher in subjects not gaining 10% of more of their body weight compared who did gain significant weight (11/27 (40.7%) vs. 0/15 (100%), chi2 = 11.805, P = 0.0035). CONCLUSIONS: Subjects with a T allele of the 5HT2C receptor -759C/T polymorphism may have a lower incidence of weight gain from olanzapine over a 6 week period compared to those with the C allele. These results need to be replicated.

Alleles↗

The association of weight gain and olanzapine plasma concentrations.

Atypical antipsychotics, including olanzapine, have been associated with clinically significant weight gain in some patients. The purpose of this study was to determine if weight gain was associated with increasing plasma concentrations during olanzapine treatment in subjects with schizophrenia. This study included 39 acutely ill subjects with schizophrenia, schizoaffective disorder, or schizophreniform disorder (DSM-III-R or DSM-IV). Assessments included the Brief Psychiatric Rating Scale (BPRS), the Scale for Assessment of Negative Symptoms (SANS), and weight measurements. Olanzapine was titrated to a dose of 5 to 20 mg/d for 2 to 6 weeks. A 24-hour plasma concentration was obtained after 6 weeks of treatment. Analysis using a receiver operator characteristic curve identified a threshold dose-weighted plasma concentration of 20.6 ng/mL being associated with an increased likelihood of clinically significant weight gain (> or =7% baseline weight) during olanzapine treatment. The associations remained significant after adjusting for age, gender, baseline body mass index, baseline symptom severity, and symptom improvement (OR = 10.1; 95% CI, 1.3-75.0; P = 0.024). Similar analysis determined that a threshold olanzapine dose of 13.3 mg/d was associated with > or =7% weight gain. However, after adjusting for potential confounders, the results did not remain significant. The association of weight gain with plasma concentrations during treatment with olanzapine may support the utilization of plasma drug concentration as a marker for antipsychotic-induced weight gain in the treatment of schizophrenia.

Adult↗

Anabolic steroid use in weightlifters and bodybuilders: an internet survey of drug utilization.

PURPOSE: Dietary supplements and ergogenic agents, including anabolic steroids, are common components of present-day bodybuilder and weightlifter training regimens. Prior reports of anabolic steroid use suggest polypharmacy and high doses of injectable agents. HYPOTHESIS: To provide an updated description of anabolic steroid regimens employed by weightlifters and bodybuilders and to determine the extent to which anabolic steroid-associated behaviors are consistent with substance dependence. STUDY DESIGN: Web-based survey. METHODS: Links to the Web-based survey instrument were established from leading bodybuilding and fitness web pages. The questionnaire included demographic information, anabolic drug use history, adverse effects, information sources, and steroid use behavior consistent with criteria for a substance dependence disorder. RESULTS: A total of 207 subjects provided a detailed anabolic steroid drug history. Steroid regimens included a mean of 3.1 agents, involved cycles ranging from 5 to 10 weeks, and often included doses 5 to 29 times greater than physiologic replacement doses. Behavior consistent with a substance dependence disorder was endorsed by 33% of respondents. CONCLUSIONS: These findings suggest that anabolic steroid use among weightlifters and bodybuilders continues, generally involving multiple steroids and additional dietary supplementary agents. The adverse effects, polypharmacy, large dosages, and risk of substance abuse are all major health care concerns that require further study. CLINICAL RELEVANCE: The survey findings provide sports medicine practitioners a reasonable estimate of the expected drug history among bodybuilders and weightlifters for the use of performance-enhancing agents.

Adolescent↗

A longitudinal analysis of antihypertensive drug interactions in a Medicaid population.

BACKGROUND: Drug interactions are a frequent cause of adverse drug events. We evaluated whether the frequency of previously reported antihypertensive drug-drug interactions could be reduced by pharmaceutical case management. METHODS: Patients >30 years of age with hypertension who were enrolled in the Iowa Pharmaceutical Case Management (PCM) program were evaluated. All prescription claims for patients were obtained on their date of eligibility and again 9 months later. A drug interaction database was developed to examine potential drug interactions in each patient's regimen. RESULTS: Antihypertensive drugs were taken by 1377 patients at baseline and at 9-month follow-up. Highly significant antihypertensive drug interactions were observed at baseline in 35% of patients (0.47 per patient), and interaction prevalence did not change over time. Decreases in the number of drug interactions tended to occur more commonly among patients of pharmacies that provided the highest intensity of service (11.5% in high-intensity pharmacies v 9% in low- or zero-intensity pharmacies, but this did not achieve statistical significance). Nearly 75% of patients had an interaction of any significance level, and the total number of interactions increased over time (P =.0067). CONCLUSIONS: This Medicaid population with hypertension had a very high prevalence of potential drug interactions. The prevalence of interactions did not change, but the mean number of all interactions actually increased over time. There was some suggestion that higher-intensity pharmacies might be more successful in minimizing the risk of clinically significant drug interactions when compared with lower-intensity pharmacies.

Adrenergic beta-Antagonists↗

The concurrent use of anticholinergics and cholinesterase inhibitors: rare event or common practice?

OBJECTIVES: To measure the prevalence of anticholinergic use cross-sectionally in patients receiving cholinesterase inhibitors and to describe change in use of anticholinergics upon inception of cholinesterase inhibitor treatment. DESIGN: Cross-sectional and inception cohort studies. SETTING: State of Iowa. PARTICIPANTS: Iowa Medicaid beneficiaries aged 50 and older with a pharmacy claim for a cholinesterase inhibitor during January 1997 through February 2000. MEASUREMENTS: Anticholinergic use was determined for all patients with a cholinesterase inhibitor pharmacy claim during January and February of 2000. A frequency distribution of all anticholinergics was compiled, with emphasis placed on those considered inappropriate in the elderly. In a separate analysis, anticholinergic use was determined at two points: 90 days before and after cholinesterase inhibitor inception. RESULTS: Of 557 patients receiving a cholinesterase inhibitor, 197 (35.4%) received an anticholinergic concurrently. Of all anticholinergics, 74.5% (178/239) had been identified as inappropriate for use in the elderly, 22.2% (53/239) under any circumstances. At the time of cholinesterase inhibitor inception, 30.2% (143/474) and 33.5% (159/474) of patients received an anticholinergic 90 days before and 90 days after inception, respectively. Increases in anticholinergic prescribing upon cholinesterase inhibitor inception exceeded decreases (Wilcoxon signed-rank test, S=529, P=.020). CONCLUSION: The concurrent use of anticholinergics and cholinesterase inhibitors is common although rarely appropriate. Patients with Alzheimer's disease deserve to receive the optimum benefit from cholinesterase inhibitor treatment, which can only be achieved through diligent and appropriate use of concurrent pharmacotherapy.

Aged↗

Osteoporosis screening and treatment in women with schizophrenia: a controlled study.

STUDY OBJECTIVE: As patients with a major psychiatric disorder such as schizophrenia generally are less likely to have their medical illnesses diagnosed and medically managed, we investigated whether osteoporosis screening, prevention management, and/or drug therapy (i.e., clinical services for osteoporosis) are provided consistently to both women with schizophrenia and those without the disease. DESIGN: Retrospective medical record review. SETTING: Three Midwest Veterans Affairs medical centers and clinics. PATIENTS: Forty-six women aged 45 years or older who had schizophrenia and 46 female control subjects who were frequency matched on age. MEASUREMENTS AND MAIN RESULTS: Twelve months of progress notes were reviewed for osteoporosis clinical services. In addition, smoking status, smoking cessation counseling, alcohol consumption, and fracture rates were compared between the groups. Overall, significantly fewer patients with schizophrenia (28 patients [61%]) received a clinical service for osteoporosis compared with the control group (37 patients [80%]). This difference was due to a significantly fewer number of patients with schizophrenia who received any osteoporosis agent (22 patients [48%]) compared with the control group (36 patients [78%]). Only 13 patients (28%) with schizophrenia received hormone replacement therapy compared with 25 control patients (54%). CONCLUSION: Women with schizophrenia in three Midwest Veterans Affairs medical centers did not receive the same level of osteoporosis care as that of age-matched control patients. This was primarily due to a lower utilization of osteoporosis agents, specifically hormone replacement therapy. Further research is necessary to determine the reason for this difference. Clinicians should be aware of medical management issues in patients with major psychiatric diagnoses and, specifically, osteoporosis care of women with schizophrenia.

Aged↗

Development of a computer algorithm for defining an active drug list using an automated pharmacy database.

BACKGROUND AND OBJECTIVE: Increasingly, pharmacy databases are being used to assist in evaluating the appropriateness of drug therapy. Such determinations often require the creation of a drug regimen at a particular point in time. The objective of this study was to develop a computer algorithm for defining a cross-sectional active drug list. METHODS: Electronic pharmacy data were obtained as part of the Iowa Medicaid Pharmaceutical Case Management Program. The active drug lists generated by the computer algorithm were compared with active drug lists generated by independent pharmacist review of the pharmacy refill data. RESULTS: In a sample of 25 patients who received 379 potentially active medications, the interrater reliability between pharmacist reviewers was excellent (kappa=0.94). In a second sample of 100 patients who received 1476 potentially active medications, the computer algorithm had a sensitivity of 93.8% and specificity of 91.7%, using pharmacist review as the comparison standard. CONCLUSION: The computer algorithm was found to be a valid method of processing electronic pharmacy data to yield a characterization of drug exposure at a point in time. The potential benefits and limitations of using this approach are discussed.

Adult↗

Measures of aggression and mood changes in male weightlifters with and without androgenic anabolic steroid use.

Supraphysiologic doses of testosterone are associated with increased aggression that is hypothesized to be a function of testosterone serum concentrations, mood, and personality. The study attempted to characterize this relationship among weightlifters who were users (n = 10) and nonusers (n = 18) of anabolic steroids. Participants were interviewed using the Modified Mania Rating Scale and Hamilton Rating Scale for Depression to assess mood, the Buss-Durkee Hostility Inventory (BDHI) and Point Subtraction Aggression Paradigm (PSAP) to assess aggression, and the Personality Disorder Questionnaire (PDQ-R) to assess personality. Blood samples were obtained for the determination of total, free, and weakly bound testosterone. Comparisons of continuous variables between testosterone users and non-users were performed with a parametric (unpaired t-test) or non-parametric (Mann-Whitney) test where appropriate. Correlations with testosterone were examined separately for testosterone users and non-users, using Spearman rank correlation. The subjective (BDHI) and objective (PSAP) assessments of aggression found that supranormal testosterone concentrations were associated with increased aggression. However, the PDQ-R results suggest that this finding was confounded by the personality disorder profile of the steroid users, because steroid users demonstrated Cluster B personality disorder traits for antisocial, borderline, and histrionic personality disorder.

Adult↗

5-HT2A receptor promoter polymorphism, -1438G/A and negative symptom response to olanzapine in schizophrenia.

The 5-HT2A receptor promoter -1438G/A polymorphism, which is in complete linkage disequilibrium with the 5-HT2A 102T/C polymorphism, may be related to antipsychotic response. The aim of this paper is to determine relationships between the -1438G/A polymorphism and olanzapine negative symptom response. DNA from 41 subjects with schizophrenia (as defined by the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition) was analyzed for the -1438G/A polymorphism. Olanzapine (7.5-20 mg/day) was given for 6 weeks and response was assessed using the Scale for Assessment of Negative Symptoms (SANS). A linear regression used a dependent variable of percent change in SANS. Independent variables included 5-HT2A polymorphisms and interactions. The -1438G/A polymorphism and percent change in SANS showed a significant trend (P=.0542). The A/A genotype group had a 45% reduction in SANS compared with 19% in the other groups. We conclude that the A/A genotype may be associated with olanzapine negative symptom response, seen as a 2-fold greater percent reduction in SANS, and may be clinically relevant.

Antipsychotic Agents↗

The extent of potential antihypertensive drug interactions in a Medicaid population.

BACKGROUND: Drug interactions are a frequent cause of adverse drug events and these might be avoided by computer alerts to physicians or pharmacists. We evaluated the frequency of potential drug-drug interactions in patients receiving medications commonly used for hypertension. METHODS: Patients more than 30 years of age with hypertension who were receiving Medicaid and who were enrolled in the Iowa Pharmaceutical Case Management (PCM) program were evaluated. All prescription claims for patients were obtained on their date of eligibility. A drug interaction database was developed to examine potential drug interactions in each patient's regimen. RESULTS: There were 1574 patients who received a drug typically used for hypertension. Depending on age and sex, 23% to 48% of patients had a potential interaction of high significance and 55% to 84% had at least one potential interaction. Both increasing age (P =.0007, odds ratio [OR] 1.012 [1.005,1.019]) and number of drugs (P <.0001, OR 1.120 [1.092,1.150]) were significantly associated with the potential for a highly significant drug interaction in the univariable models. Female sex was not significant (P =.56, OR 1.074 [0.845,1.364]). The multivariable model found that there was a significant interaction between age and the number of drugs in the regimen (P <.0001). CONCLUSIONS: This study found a very high frequency of potential drug interactions with agents typically used for hypertension. Because of the large volume of potential interactions, these data raise the concern that any attempt to provide physicians and pharmacists with computer alerts about these interactions will result in alerts for the vast majority of patients.

Adult↗

Risperidone versus clonidine in the treatment of children and adolescents with Tourette's syndrome.

OBJECTIVE: To evaluate the efficacy and tolerability of risperidone in comparison with clonidine in the treatment of children and adolescents with Tourette's syndrome (TS). METHOD: Following a 7- to 14-day single-blind, placebo lead-in, 21 subjects aged 7 to 17 years were randomly assigned to 8 weeks of double-blind treatment with clonidine or risperidone. Research scales evaluated tics and comorbid obsessive-compulsive and attention-deficit/hyperactivity symptoms. RESULTS: Risperidone and clonidine appeared equally effective in the treatment of tics in an intent-to-treat analysis, as rated by the Yale Global Tic Severity Scale (YGTSS). Risperidone produced a mean reduction in the YGTSS of 21%; clonidine produced a 26% reduction. Among subjects with comorbid obsessive-compulsive symptoms, 63% of the risperidone group and 33% of the clonidine group responded to treatment (not significant). The most common adverse event seen with both treatments was sedation, which was mild to moderate in severity. Sedation subsequently resolved with continued administration of the medication or with a dose reduction. No clinically significant extrapyramidal symptoms were observed. CONCLUSIONS: In this pilot study, risperidone demonstrated efficacy equivalent to clonidine in the treatment of tic symptoms in children and adolescents with TS. Further research is needed to clarify the role of atypical antipsychotics in TS and to delineate potential benefits for comorbid obsessive-compulsive and attention-deficit/hyperactivity symptoms.

Adrenergic alpha-Agonists↗

Psychiatric prescribing trends and practices in Iowa's prisons.

In response to rising pharmacy costs in the Iowa Department of Corrections prison system, a retrospective analysis of psychiatric drug use and expenditures was performed for fiscal years 1990 through 2000. Population-adjusted changes in use and expenditures over time were analyzed in aggregate and by drug class. Expenditures for psychiatric drugs increased 28-fold from $7,974 in 1990 to $381,893 in 2000, or from $291 to $8,138 per 100 inmates, while use increased fivefold. The use of antipsychotics remained relatively constant, but expenditures increased ninefold. In contrast, both use of and expenditures for antidepressants increased tremendously, from $215 to $1,929 per 100 inmates.

Adult↗

Anabolic steroids: a review for the clinician.

The number of athletes self-administering ergogenic pharmacological agents to increase their competitive edge continues to be a problem. Most athletes using anabolic steroids (AS) have acquired a crude pharmacological database regarding these drugs. Their opinions regarding steroids have been derived from their subjective experiences and anecdotal information. For this reason, traditional warnings regarding the lack of efficacy and potential dangers of steroid misuse are disregarded. A common widely held opinion among bodybuilders is that the anabolic steroid experts are the athletic gurus who for years have utilised themselves as the experimental participants and then dispensed their empirical findings. This review will address the common anabolic steroid misconceptions held by many of today's athletes by providing an evaluation of the scientific literature related to AS in athletic performance.

Adolescent↗

Testosterone therapy in late-life major depression in males.

BACKGROUND: Major depression associated with aging in males may improve with anabolic/androgenic steroid therapy. The efficacy and safety of testosterone therapy in the treatment of depression in elderly hypogonadal males is inconclusive. The following study identifies a subgroup of elderly depressed males who may benefit from testosterone therapy. METHOD: Participants included 16 elderly eugonadal males with major depressive disorder (DSM-IV criteria) and a Hamilton Rating Scale for Depression (HAM-D) score > 18. Following a single-blind 2-week placebo lead-in, patients were randomly assigned to treatment with either a physiologic dose of testosterone cypionate (TC), 100 mg/week, or supraphysiologic dose of 200 mg/week IM for 6 weeks. Psychometric testing was carried out at entry into the study, at the TC injection baseline, and every 2 weeks thereafter. Tests included an objective measurement, the HAM-D, and the Buss-Durkee Hostility Inventory. RESULTS: One patient meeting inclusion criteria responded during the placebo lead-in; thus, 15 patients were randomly assigned to treatment (100 mg/week, N = 8; 200 mg/week, N = 7). There was a 42% decrease in the mean HAM-D scores from 20.1 to 11.9 (p <.0001). However, the majority of the change was due to improvement in the 10 late-onset (< or = 45 years old) depression patients, whose mean HAM-D score decreased from 19.8 to 9.3 (53%), versus the 5 early-onset depression patients, whose mean HAM-D score decreased from 20.8 to 17.0 (18%) (p =.0110). The TC dose did not affect the response. Similar HAM-D decreases of 43% and 41% occurred for the respective 100- and 200-mg/week doses. The HAM-D responder analysis found that none of 5 early-onset patients had HAM-D response, whereas 6 (60%) of 10 late-onset patients responded (p =.025). Similarly, none of the early-onset patients experienced a remission whereas 5 (50%) of the late-onset patients were categorized as remitters (p =.053). Correlations between the peak and mean total testosterone concentrations and HAM-D change scores suggested that only minimal TC doses were required to produce an antidepressant effect. CONCLUSION: These data suggest that testosterone therapy would best be limited to men with late-onset depression. The findings suggest that short-term therapy with TC is safe. Long-term treatment safety is unknown. Psychiatrists using testosterone therapy should ascertain that patients have been recently valuated for prostate cancer. If testosterone therapy is initiated, serial serum prostate-specific antigen sampling should be used for monitoring patients' prostate status.

Anabolic Agents↗

A critical appraisal of the utility of the serum anticholinergic activity assay in research and clinical practice.

The serum anticholinergic activity (SAA) assay was originally designed to quantify the anticholinergic burden of drug exposure. The same assay has been used to measure the anticholinergic activity of standard drug solutions. There are limitations to the use of the assay in research and in applying these findings to clinical practice. Assays of standard drug solutions do not account for pharmacokinetic differences among drugs, which limits the interpretation of such measurements. In addition, emerging evidence has suggested that anticholinergic medications may not be the only cause of elevated SAA. Despite these limitations, elevated SAA has been consistently associated with cognitive impairment and delirium in a number of research settings. Such findings have prompted investigators to consider the potential application of the SAA assay in research and in clinical practice. Therefore, the objectives of this review are to summarize the current literature involving the SAA assay, describe the relative merits and shortfalls of the SAA assay as a research tool, and discuss the potential for use of the SAA assay as a clinical tool.

Animals↗