Agnès Sommet

Clinical and imaging evidence of zolpidem effect in hypoxic encephalopathy

We conducted a randomized, double‐blind, placebo‐controlled, single‐patient (N = 1) trial to evaluate the efficacy of zolpidem in a 48‐year‐old woman with an akinetic mutism. Motor and cognitive examinations and functional imaging were performed. Acute administration of zolpidem markedly improved motor performance and neuropsychological status. Cerebral metabolism (18F‐fluorodeoxyglucose positron emission tomography) increased in postrolandic territories and in frontal cortex. Using the H215O positron emission tomography, we found a drug‐induced activation in the anterior cingulate and orbitofrontal cortices. Zolpidem induced a transient improvement in motor and cognitive performances. This paradoxical effect could result from an activation of limbic loops modulating motivational processes. Ann Neurol 2007

Benefits and strengths of the disproportionality analysis for identification of adverse drug reactions in a pharmacovigilance database.

Adverse drug reactions (ADRs) represent an important medical issue: they result in 3–7% of all hospital admissions and are associated with a substantial increase in morbidity and mortality. Numerous methods can be used to investigate ADRs. Each has its strengths and weakness. The insufficiencies of basic (experimental) pharmacology as well as clinical trials for studying ADRs are well known. Animal physiology often differs from that of humans. Clinical trials, although necessary, do not allow definite conclusions, because they are built to evaluate efficacy more than safety. Thus, spontaneous notifications remain the cornerstone for ADRs despite their mandatory limitations (under-reporting, selective reporting, lack of denominator etc.). Intensive studies could allow quantification of a specific problem of drug safety (i.e. drug admission into hospital for ADRs). For some years, several pharmacoepidemiological methods have been used to identify and also to quantify ADRs. Among thesse methods, case–control or cohort studies are most widely used. However, their setting up requires specific organization, delay, money and also use of large databases, which are not often specifically built for evaluation of ADRs. In the present issue of the journal, clinical pharmacologists and pharmacoepidemiologists from Poitiers University Hospital (France) have used another method, working from the French PharmacoVigilance database. They used disproportionality analysis for identification of memory disorders associated with drugs [1]. The present paper discusses the benefits and strengths of this method.

Total Body Composition by DXA of 241 HIV-Negative Men and 162 HIV-Infected Men: Proposal of Reference Values for Defining Lipodystrophy

The aim of this study was to define standard values for fat mass distribution by dual-energy X-ray absorptiometry in human immunodeficiency virus (HIV)-negative men and to analyze factors associated with lipodystrophy in HIV-infected men. Total-body composition was analyzed in 241 HIV-negative men (controls) and 162 HIV-infected men. We created a fat mass ratio (FMR) as the ratio of the percentage of the trunk fat mass to the percentage of the lower limbs fat mass. We defined the FMR standard values as the mean value+/-standard deviation. We compared body mass index (BMI), fat mass percentage (%FM), lean mass (LM), bone mineral density (BMD), and FMR between the control group and HIV-infected men, by age range, according to prescription of treatment and presence of clinical lipodystrophy. The FMR standard value is equal to 1.3+/-0.2. The FMR was higher in treated HIV-infected men with or without clinical lipodystrophy. The FMR was similar for naïve HIV-infected men and controls. It was positively correlated with age, cumulative time on treatment, zidovudine, stavudine, or indinavir. BMD and fat mass were lower for treated and naïve HIV-infected men than for HIV-negative men. The FMR seems to be a valuable index for measuring fat mass distribution. We defined FMR standard values from the largest group of HIV-negative men to our knowledge. Applying FMR to HIV patients could help physicians to diagnose lipodystrophy earlier.

Withdrawing amantadine in dyskinetic patients with Parkinson disease The AMANDYSK trial

Objective: The AMANDYSK trial was designed to assess long-term efficacy of chronic treatment with amantadine in patients with Parkinson disease (PD) and levodopa-induced dyskinesia (LID). Methods: This was a 3-month, multicenter, randomized, double-blind, placebo-controlled, parallel-group, wash-out study conducted in 57 amantadine-treated (≥200 mg/d for ≥6 months) dyskinetic patients with PD. The primary outcome measure was the change from baseline in a Unified Parkinson’s Disease Rating Scale (UPDRS) dyskinesia subscore (items 32 [duration] + 33 [severity]). Secondary outcomes included other LID measurements (“responders” analysis, premature dropout for LID, Abnormal Involuntary Movement Scale). Exploratory outcomes included time with troublesome dyskinesia as measured by diaries, UPDRS Motor Examination (part III) for motor symptoms of PD, and fatigue and apathy scores for nonmotor symptoms. Results: UPDRS items 32 + 33 deteriorated more in patients switched to placebo (“discontinuing” group) (+1.7 ± 2.0 units; 95% confidence interval 0.9, 2.4) as compared with those maintained on amantadine (“continuing” group) (+0.2 ± 1.5 units; 95% confidence interval −0.4, 0.8; p = 0.003). Secondary outcomes confirmed this difference because there were significantly more responders, more dropouts for LID, greater increase in “ON” time with troublesome dyskinesia, and greater worsening of Abnormal Involuntary Movement Scale score in the discontinuing group. There were no between-group differences in the UPDRS Motor Examination, whereas apathy (as measured by caregivers) and fatigue scores tended to worsen more in patients randomized to placebo. Conclusion: Wash-out of amantadine in dyskinetic patients with PD significantly worsened LID. No significant effect was observed on motor parkinsonian symptoms, while exploratory outcomes suggested that amantadine might improve apathy and fatigue in such patients. Classification of evidence: This article provides Class II evidence that in patients with PD, withdrawing amantadine significantly aggravates LID in a median time of 7 days.

Cancer Risk of Anti-TNF-α at Recommended Doses in Adult Rheumatoid Arthritis: A Meta-Analysis with Intention to Treat and per Protocol Analyses

Background The risk of malignancies on TNF-α antagonists is controversial. The aim of this survey was to assess cancer risk on TNF-α antagonists in adult rheumatoid arthritis patients, including the five marketed drugs (infliximab, etanercept, adalimumab, golimumab and certolizumab) used in line with the New Drug Application. Furthermore, the relative interest of modified intention to treat or per protocol analyses to assess such sparse events remains unknown. Methodology/Principal Findings Data sources were MEDLINE, CENTRAL, ISI Web of Science, ACR and EULAR meeting abstracts, scientific evaluation of the drugs leading to their marketing approval, and clinicaltrials.gov, until 31 December 2012.We selected double-blind randomized controlled trials in adult rheumatoid arthritis patients, including at least one treatment arm in line with New Drug Application. We performed random effect meta-analysis, with modified intention to treat and per protocol analyses. Thirty-three trials were included. There was no excess risk of malignancies on anti-TNF-α administered in line with New Drug Application in the per protocol model (OR, 0.93 95%CI[0.59–1.44]), as well as in the modified intention to treat model (OR, 1.27 95%CI[0.82–1.98]). There was a non-significant tendency for an excess non-melanoma skin cancer risk in both models (respectively, 1.37 [0.71–2.66] and 1.90 [0.98–3.67]). With fixed effect Peto model restricting to trials during at least 52 weeks, the overall cancer risk was respectively 1.60 [0.97–2.64] and 1.22 [0.72–2.08]. Whatever the model, modified intention to treat analysis led to higher estimations than per protocol analysis. The later may underestimate the treatment effect when assessing very sparse events and when many patients dropped out in placebo arms. In metaregression, there was no differential risk among the five drugs. Conclusions/Significance This study did not find any evidence for an excess cancer risk on TNF-α antagonists in adult rheumatoid arthritis patients, but an excess cancer risk after several years of exposure cannot be ruled out. Both modified intention to treat and per protocol analyses should be presented in such safety analyses.

Impact of Polypharmacy on Occurrence of Delirium in Elderly Emergency Patients

OBJECTIVE To examine associations between polypharmacy and delirium diagnosed in elderly patients hospitalized in geriatric acute care unit after emergency hospital admission. METHODS Study design was an observational cohort study in the acute geriatric care unit of a university hospital. We included 410 consecutive patients admitted to the acute geriatric ward during 9 months. Within 72 hours of each patients hospitalization, a clinically trained geriatrician collected the following data: sociodemographic details (age, sex, type of residence), predisposing factors for delirium, main cause of hospitalization, and current medications. Polypharmacy was defined as 6 or more drugs a day. Delirium was assessed by a geriatrician using the Confusion Assessment Method and was diagnosed on the basis of clinical history with an acute change in usual functional status, behavioral observation, and clinical and cognitive assessment. RESULTS Nearly 25% of hospitalized patients had delirium. The Confusion Assessment Method was positive in 69% of patients receiving polypharmacy and in 30% of those not receiving polypharmacy, a relative risk of 2.33. The proportion of elderly patients receiving polypharmacy was 58.53%. CONCLUSIONS In our study, polypharmacy is an independent risk factor for delirium in a population of elderly patients after emergency admission. In the geriatric population, delirium is an underestimated scourge and because of its medicosocial and economic consequences and its impact on morbidity and mortality, we need to give increased attention to the prevention and control of polypharmacy, which is a predisposing factor for delirium.

Drug interactions with cholinesterase inhibitors: an analysis of the French pharmacovigilance database and a comparison of two national drug formularies (Vidal, British National Formulary).

AbstractBackground: Cholinesterase inhibitors (ChEIs) could be involved in several drug-drug interactions (DDIs) because of their complex pharmacodynamic and/or pharmacokinetic properties. Aim: To identify spontaneous reports in the French Pharmacovigilance Database containing DDIs with the three ChEIs marketed in France (donepezil, galantamine or rivastigmine) and to compare the informativity of two national drug references, the French national formulary (Vidal) and the British National Formulary (BNF), for their ability to identify ChEI-related DDIs. Methods: Spontaneous reports submitted to the French Pharmacovigilance Database concerning donepezil, galantamine or rivastigmine were reviewed by two clinical pharmacologists from Toulouse Regional Pharmacovigilance Centre. Spontaneous reports containing DDIs were identified according to Vidal, BNF or their own judgement (and with use of the interaction supplement of the French independent drug information bulletin La Revue Prescrire). Then, the potential of DDIs to result in adverse drug reactions (ADRs) was evaluated. Finally, the presentations of the different ChEIs in the two references (Vidal, BNF) were compared for their DDI informativity. Results: A total of 1058 spontaneous reports were identified that involved ChEIs in the French Pharmacovigilance Database up to 31 March 2006; of these 376 (35.5%) contained at least one DDI according to experts’ judgement. In total, 118 DDIs (31.4%) were the cause of ADRs. Most of the DDIs were due to pharmacodynamic interactions (247 cases, 65.7%). The most frequently encountered drugs involved in DDIs were bradycardic (205 cases, 54.5%) and anticholinergic (118 cases, 31.4%) drugs. DDIs were found in 309 spontaneous reports (29.2%) according to Vidal and in 127 (12.0%) according to BNF. In total, 88 ’serious’ ADRs were related to DDIs (including seven deaths, mainly due to cardiovascular ADRs). The most frequently observed ADRs due to DDIs were cardiovascular (67 cases, mainly bradycardia, atrioventricular block and arterial hypotension) and neurological (33 cases, mainly mental confusion). Comparison of the different presentations of summary of product characteristics (SPC) showed that Vidal was more informative than BNF for all the ChEIs, and that galantamine had the most complete data in the two references. Conclusion: DDIs were present in more than one-third of spontaneous reports including ChEIs registered in the French Pharmacovigilance Database. Approximately, one-third of these DDIs were the cause of ADRs. The informativity of European drug dictionaries differs substantially and Vidal was found to be more informative than BNF for all the ChEIs.

Influence of fluoroquinolone consumption in inpatients and outpatients on ciprofloxacin-resistant Escherichia coli in a university hospital

BACKGROUND The increase in fluoroquinolone-resistant Escherichia coli has raised the issue of treatment failure in common infections. Few studies have investigated the possible relationship between outpatient fluoroquinolone consumption and resistance in hospital. OBJECTIVE To investigate the relationship between inpatient and outpatient fluoroquinolone use and ciprofloxacin-resistant E. coli in a teaching hospital. METHODS An ecological study was conducted in Toulouse University Hospital and its surrounding area, the Midi-Pyrénées region (south-western France), in 2004-07. Dynamic regression models were built to study how the hospital resistance rate was linearly related to current and past values of fluoroquinolone consumption. Resistance forecasts for 2008 were then calculated and compared with actual rates for the first 5 months of the year. RESULTS Mean resistance rate was 13.7% and mean fluoroquinolone use was 89.9 defined daily doses (DDDs)/1000 inpatient days in hospital and 2.6 DDDs/1000 inhabitants/day in the region. Taking into account past values of fluoroquinolone consumption in hospital and in outpatients, only levofloxacin use in the community remained significantly associated with resistance in hospital, with a lag of 12 months. This model explained 50% of the resistance variability. CONCLUSIONS This ecological analysis, conducted on a teaching hospital scale, suggests that ciprofloxacin resistance in E. coli in hospital is linked to consumption of fluoroquinolones within the hospital and its surrounding community. Among all fluoroquinolones, levofloxacin use was found to be the most important factor. Consumption in outpatients appears to be a relevant determinant to consider in designing interventions to reduce resistance in hospitals.

Improving adverse drug reaction reporting in hospitals: results of the French Pharmacovigilance in Midi-Pyrénées region (PharmacoMIP) network 2-year pilot study.

AbstractBackground: Spontaneous reporting of adverse drug reactions (ADRs) is fundamental to drug safety surveillance (pharmacovigilance); however, substantial under-reporting exists and is the main limitation of the system. Several factors could favour under-reporting. Objective: The aim of this pilot study was to assess the effect of regular visits of a Clinical Research Assistant (CRA) on the improvement of ADR reporting in non-university hospitals. Methods: We set up an ADR report collecting system that involved regular visits by a CRA to non-university hospitals, which was similar to a system that already existed in university hospitals in Toulouse, France. Two areas in our region were chosen: Haute Garonne and Gers. We compared firstly the reporting rate (number of reports/number of beds) of total ADRs (i.e. spontaneously reported ADRs plus solicited ADRs collected by the CRA) and secondly, the percentage of serious ADRs reported by non-university hospitals in these two areas, in 2005 (the year prior to CRA visits) and after the start of CRA visits (2006 until the end of December 2008). We also compared the reporting rate of total ADRs in Haute Garonne and Gers non-university hospitals with those reported during the same period with a control group (the Ariège area, which has a similar number of beds to Gers and that was not visited by the CRA). The characteristics of ADRs collected by the CRA were also described. Results: A total of 687 reports were collected by the CRA: 40% were classified as serious, including two deaths. The number of ADRs and the reporting rate increased significantly between 2005 and 2008 in non-university hospitals of Haute-Garonne and Gers, but not in Ariège. In Gers, the reporting rate was 3% in 2005 and 25% in 2008. In Haute-Garonne, the reporting rate was 11% in 2005 and 40% in 2008. The difference between the number of spontaneous and solicited reports also increased. Conclusions: This study shows that regular visits by a CRA increases the number of ADRs collected by a Regional Pharmacovigilance Centre. Another interesting consequence was the rise in spontaneous reporting by healthcare professionals following the set-up of this system. Further assessment of this procedure is necessary for the long-term evaluation of its effectiveness.

Is the risk of tumour necrosis factor inhibitor-induced lupus or lupus-like syndrome the same with monoclonal antibodies and soluble receptor? A case/non-case study in a nationwide pharmacovigilance database

OBJECTIVE Each TNF-α inhibitor (TNFi) can induce lupus or lupus-like syndrome. Nevertheless, the risk may differ between drugs because of different apoptosis induction properties. The aim of this study was to assess the putative association of each TNFi with lupus or lupus-like-syndrome. METHODS All spontaneous reports of TNFi-related lupus recorded in the French pharmacovigilance database between January 2000 and December 2012 were described. We conducted disproportionality analyses (case/non-case method) to assess the link between TNFi and lupus, calculating reporting odds ratios (RORs). We used isoniazid as positive control and acetaminophen as negative control. We performed sensitivity analyses to test for event-related and drug-related competition biases. RESULTS Among 309 671 spontaneous reports, 5213 involved TNFi. Among these, 39 were lupus or lupus-like syndromes: 25 involved infliximab, 9 adalimumab and 5 etanercept. The male:female sex ratio was 0.1 and the mean age was 44.9 years. Among the 39 cases, 28% fulfilled at least four ACR criteria for SLE. Median time to lupus onset was 11 months. Cutaneous and rheumatological involvement were the most frequent. Antinuclear autoantibodies were present in all patients, with anti-DNA specificity in 77.8%. Improvement was observed after TNFi withdrawal. There was a significant association between TNFi and lupus (ROR = 7.72, 95% CI 5.50, 10.83). The ROR was similar for infliximab (10.97, 95% CI 7.27, 16.56) and adalimumab (9.03, 95% CI 4.64, 17.58) and was 4.02 (95% CI 1.66, 9.75) for etanercept. Sensitivity analyses led to similar results. CONCLUSION Although CIs overlap, there is a clear trend towards a decreased risk with etanercept compared with monoclonal TNFis.