Trends in hospital admissions for adverse drug reactions in England: analysis of national hospital episode statistics 1998-2005

Study on drug related hospital admissions in a tertiary care hospital in South India

BACKGROUND AND OBJECTIVES

Accidental and intentional poisonings or drug overdoses constitute a significant source of aggregate morbidity, mortality, and health care expenditure. Studies evaluating drug related hospitalization have estimated that approximately 5-10% of all hospital admissions are drug related. The present study was carried out to investigate type, nature and incidence of drug related admissions in our hospital settings.

METHOD

A hospital based retrospective study was conducted in 575 cases of drug related admissions. The case records of patients admitted in various clinical departments of Amrita Institute of Medical Sciences (AIMS) Hospital during last 8 years (January 2002-December 2009) were collected and analyzed.

RESULTS

During the retrospective study, the total number of drug related cases reported were 575. Out of these, 35.5% cases were induced by central nervous system (CNS) drugs, 19.8% were by cardiovascular system (CVS) drugs, 12.3% were by NSAIDs, 11.3% were by antibiotics and 9.9% were by anticoagulants, 11.3% by other drugs which includes hormones, cytotoxic drugs, hypolipidemics, etc. Four hundred and forty cases were admitted to emergency department. Common drug related problems resulting in hospital visits were due to intentional, accidental and overdose. The incidence of drug related hospital admissions was found to be 0.20%.

CONCLUSION

The most of the accidental and suicidal cases were reported are by CNS drugs. Psychiatric patients intentionally taking medicines as suicidal attempt and as a part of their illness. As drug related problems are so significant, increased awareness and enhanced collaborative efforts among patients, physicians, pharmacists and caregivers within community and hospital have the potential to minimize the impact of this problem.

[Pharmacologically-induced neurocatastrophes]

Drug-induced adverse reactions represent a significant health problem in developed countries. These events cause 5% of hospital admissions and are one of the main causes of mortality. Neurological manifestations are among the most frequent. This article reviews catastrophic cerebrovascular situations and confusional syndromes, as well as epilepsy, structural encephalopathy, neuromuscular disorders, catastrophic movement disorders and infections, all of which can be drug-induced.

Adverse drug reactions related hospital admissions in persons aged 60 years and over, The Netherlands, 1981-2007: less rapid increase, different drugs

BACKGROUND

Epidemiologic information on time trends of Adverse Drug Reactions (ADR) and ADR-related hospitalizations is scarce. Over time, pharmacotherapy has become increasingly complex. Because of raised awareness of ADR, a decrease in ADR might be expected. The aim of this study was to determine trends in ADR-related hospitalizations in the older Dutch population.

METHODOLOGY AND PRINCIPAL FINDINGS

Secular trend analysis of ADR-related hospital admissions in patients ≥60 years between 1981 and 2007, using the National Hospital Discharge Registry of The Netherlands. Numbers, age-specific and age-adjusted incidence rates (per 10,000 persons) of ADR-related hospital admissions were used as outcome measures in each year of the study. Between 1981 and 2007, ADR-related hospital admissions in persons ≥60 years increased by 143%. The overall standardized incidence rate increased from 23.3 to 38.3 per 10,000 older persons. The increase was larger in males than in females. Since 1997, the increase in incidence rates of ADR-related hospitalizations flattened (percentage annual change 0.65%), compared to the period 1981-1996 (percentage annual change 2.56%).

CONCLUSION/SIGNIFICANCE

ADR-related hospital admissions in older persons have shown a rapidly increasing trend in The Netherlands over the last three decades with a temporization since 1997. Although an encouraging flattening in the increasing trend of ADR-related admissions was found around 1997, the incidence is still rising, which warrants sustained attention to this problem.

Ten-year trends in hospital admissions for adverse drug reactions in England 1999-2009

OBJECTIVES

Adverse drug reactions (ADR) are an important cause of morbidity and mortality. We analysed trends in hospital admissions associated with ADRs in English hospitals between 1999 and 2008.

DESIGN

Data from the Hospital Episode Statistics database were examined for all English hospital admissions (1999-2008) with a primary or secondary diagnosis of an ADR recorded.

SETTING

All NHS (public) hospitals in England.

MAIN OUTCOME MEASURES

The number of admissions and in-hospital mortality rate with a primary (codes including 'adverse drug reaction', 'drug-induced', 'due to drug', 'due to medicament' or 'drug allergy') or secondary diagnosis of ADR (ICD-10 Y40-59) were obtained and analysed. Further analysis for the year 2008-2009 was performed with regard to age, gender, proportion aged >65 yrs and total bed-days.

RESULTS

Between 1999 and 2008, there were 557,978 ADR-associated admissions, representing 0.9% of total hospital admissions. Over this period the annual number of ADRs increased by 76.8% (from 42,453 to 75,076), and in-hospital mortality rate increased by 10% (from 4.3% to 4.7%). In 2008, there were 6,830,067 emergency admissions of which 75,076 (1.1%) were drug-related. Systemic agents were most commonly implicated (19.2%), followed by analgesics (13.3%) and cardiovascular drugs (12.9%).There has been a near two-fold increase in nephropathy and cardiovascular consequences secondary to drugs and a 6.8% fall in mental and behavioural disorders due to drugs. Conclusions ADRs have a major impact on public health. Our data suggest the number of ADR admissions has increased at a greater rate than the increase in total hospital admissions; some of this may be due to improved diagnostic coding. However, in-hospital mortality due to ADR admissions also increased during the period. Our findings should prompt policymakers to implement further measures to reduce ADR incidence and their associated in-hospital mortality, and methods to improve the recording of ADRs.

Adverse drug effects in hospitalized elderly: data from the healthcare cost and utilization project

We aimed to analyze trends in hospital admissions due to adverse drug effects between the years 2000 to 2007 among the elderly using the National Inpatient Sample (NIS) of the Healthcare Cost and Utilization Project. We identified the discharges with the principal and all listed diagnoses related to adverse drug effects and associated hospital charges using the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9) codes. Between 2000 and 2007, 321,057 patients over 65 years were discharged with a principal diagnosis related to an adverse drug effect. Hospital charges were $5,329,276,300 or $666,159,537 annual cost. The number of discharges and total hospital charges did not change over the examined years, while mean charge per discharge increased on average by $1064 ± 384 per year. Total hospital charges for drug-induced gastritis with hemorrhage increased the most by $11,206,555 per year among those 66–84 years old and by $8,646,456 per year among those older than 85 years. During 2007, 791,931 elderly had adverse treatment effects among all listed diagnoses with hospital charges of $937,795,690. Effective drug management interventions are needed to improve safety of treatments in the elderly.

Drug treatment in an ageing population: practical implications

The population of the industrialised nations is ageing. By 2020 those of 65 years and older will constitute nearly 17% of the US population; it is predicted that the proportion of the population aged 80 years and over will then range from 3.5 to 6.5%, around the world. Those over 65, due to age-related chronic disease and more prophylactic prescribing, receive a disproportionate number of drugs; in the UK for example, 45% of the total prescriptions dispensed. Older patients may benefit from prophylactic treatments to a greater extent than younger people because of a higher absolute risk of disease and it is therefore important that they are not inappropriately denied these. However, it is also important that, as each additional drug prescribed brings an increased risk of an adverse drug effect, prescribers have enough knowledge of pharmacological issues in old age to enable them to weigh up these conflicting pressures to arrive at good prescribing decisions.

Medicine use in older people's inpatient mental health services

The aims of this audit were to establish the range and volumes of medicines used in older people's mental health settings and to explore the safety of the prescribing habits through the application of the revised Beers criteria. An audit of all patients on all selected wards (both functional and organic) for current prescriptions of all drugs routinely prescribed on the census day was undertaken on 11 wards in three Mental Health NHS Trusts in the North West of England. Data were collected on 154 patients in 11 different inpatient settings in three Mental Health Trusts. A total of 153 patients had 882 prescriptions of 196 drugs (mean 5.8 drugs). Most frequently prescribed drugs were aspirin (n= 57, 6.5%), paracetamol (n= 36, 4.1%) and quetiapine (n= 35, 4.0%). Nine of the 48 potentially inappropriate medicines in the revised Beers criteria had been prescribed, although at within appropriate limits. The audit highlights the complexity of poly-pharmacotherapy in older adults admitted to mental health services. Further works needs to establish whether nurses have the clinical knowledge and skills to ensure safe practice. There appears to be continued variation in prescribing practice.

Detection of adverse drug reactions through the minimum basic data set

OBJECTIVE

To analyze adverse drug reaction (ADR) detection using the Minimum Basic Data Set (MBDS) at hospital discharge and to compare the ADR reporting rate to the Pharmacovigilance Referral Centre with other similar hospitals that do not use this reporting system. Setting 650-bed University Hospital serving a population of 294,000 inhabitants in Spain.

METHOD

A retrospective descriptive study was conducted between January 2006 and December 2007. All reports of ADRs gathered in MBDS (a tool that encodes all administrative and clinical information generated for each patient during a hospitalization episode) with International Classification Disease codes between E930 and E949.9 were analyzed to assess the appropriateness of their referral to the pharmacovigilance centre. Finally, we compared our reporting rate with other hospitals that do not use this system for ADR identification.

MAIN OUTCOME MEASURE

The incidence of ADRs detected in hospitalized patients and the reporting rate (per thousand inhabitants) to the referral pharmacovigilance centre using the Yellow Card system.

RESULTS

Out of 43,282 hospital discharges, 386 ADR were recorded (0.89% of hospitalized patients). The mean (+/-SD) age of patients with reported ADR was 61.9 years (+/-19.2), median age was 65 years, and 55.2% were female. The Department of Pharmacy reported 276 (71.5%) of ADR using the Yellow Card system. The most frequently reported drugs were anti-cancer agents (42.5%) and cardiovascular drugs (23.8%), with a high frequency of digitalis glycosides (18.4%). ADR were most frequently recorded by the Departments of Oncology (41.7%) and Internal Medicine (17.9%).

CONCLUSION

The MBDS is a useful and accessible instrument to determine the incidence of ADR in a hospital, resulting in the notification of severe events that might otherwise not be reported. Its use also improves identification of the main drugs responsible for ADR and of the patient populations at greatest risk, facilitating the implementation of alert systems and the development of prevention and detection strategies.

Pharmacogenomics: a new paradigm to personalize treatments in nephrology patients

Although notable progress has been made in the therapeutic management of patients with chronic kidney disease in both conservative and renal replacement treatments (dialysis and transplantation), the occurrence of medication-related problems (lack of efficacy, adverse drug reactions) still represents a key clinical issue. Recent evidence suggests that adverse drug reactions are major causes of death and hospital admission in Europe and the United States. The reasons for these conditions are represented by environmental/non-genetic and genetic factors responsible for the great inter-patient variability in drugs metabolism, disposition and therapeutic targets. Over the years several genetic settings have been linked, using pharmacogenetic approaches, to the effects and toxicity of many agents used in clinical nephrology. However, these strategies, analysing single gene or candidate pathways, do not represent the gold standard, being the overall pharmacological effects of medications and not typically monogenic traits. Therefore, to identify multi-genetic influence on drug response, researchers and clinicians from different fields of medicine and pharmacology have started to perform pharmacogenomic studies employing innovative whole genomic high-throughput technologies. However, to date, only few pharmacogenomics reports have been published in nephrology underlying the need to enhance the number of projects and to increase the research budget for this important research field. In the future we would expect that, applying the knowledge about an individual's inherited response to drugs, nephrologists will be able to prescribe medications based on each person's genetic make-up, to monitor carefully the efficacy/toxicity of a given drug and to modify the dosage or number of medications to obtain predefined clinical outcomes.

Awareness and reporting of adverse drug reactions among health care professionals in Sudan

BACKGROUND

Providers are often unaware of adverse drug reactions (ADRs) or may even lack basic knowledge about them. Underreporting has been attributed to time constraints, misconceptions about spontaneous reporting and bureaucratic reporting procedures, lack of information on how to report and a lack of availability of report forms, and physicians' attitudes to ADRs. This study was undertaken to determine baseline data for health care leaders' and policymakers' knowledge, attitudes, and policies related to ADRs at eight hospitals in Wad Madani, Sudan.

METHODS

A random sample of participants completed the survey, which consisted of 35 closed questions and/or open-ended statements.

RESULTS

Five hundred (83.3%) of the initial 600 surveys were returned, of which 475 (95%) were completed. Of the respondents, 175 (36.8%) were physicians, 100 (21.1%) were pharmacists, and 200 (42.1%) were nursing staff. The results indicated lack of polices for ADRs in most of the surveyed facilities. More than two thirds of the participants stated that they were not performing any ADR monitoring. The main reasons for not reporting ADRs were lack of knowledge on how to report (27.0%) and lack of awareness about the existence of national or international reporting systems (26.5%). Almost half (46%) of the participants reported the lack of any educational efforts for ADR prevention.

DISCUSSION

Low awareness among health care professionals toward ADRs may reflect lack of basic knowledge and lack of vigilance. The study has helped promote health care professionals' ADR awareness and vigilance at the surveyed health care facilities. Education and training regarding ADRs of health professionals are warranted. Steps have been taken to develop ADR monitoring programs in collaboration with other stakeholders.

Treatment of chronic non-malignant pain in the elderly: safety considerations

Non-malignant pain in the elderly is frequently under-treated, with physicians appearing to be uncertain concerning how best to achieve optimum management of this common problem in individual cases. The aim of this review is to provide a brief overview and discuss the variety of interacting factors that contribute to the continuing under-treatment of chronic non-malignant pain in the older population. The central objective is to encourage safer and more effective pain management in a population that is highly vulnerable to painful conditions and to the consequences of poorly treated pain. Under-treatment of pain as experienced by the elderly is largely a consequence of uncertainties that arise within a complex environment that is underscored and exacerbated by the progressive and rapid aging of the global population. Uncertainties include the optimum management of pain in geriatric syndromes, frailty and dementia, and their impact on diagnosis, pain assessment and choices of treatment modalities. There is an inadequate evidence base for pharmacological interventions in older persons with respect to pharmacokinetic and pharmacodynamic changes that occur with aging. In this review, the prevalence of chronic pain and the incidence of adverse drug reactions are identified as factors that encourage conservatism in prescribing, as are major predictors of adverse drug reactions, i.e. aging, inappropriate combinations of medications and polypharmacy. The major classes of analgesic drugs are summarized with reference to their mechanisms of action, analgesic properties and known adverse effects. Although all medications have associated risks, the use of analgesics in managing persistent pain in elderly people is widely supported and guided on the basis of clinical experience and consensus among specialists in geriatrics and pain management. It is concluded that the absence of trial data, specific to the elderly, is substantially offset by information based on clinical experience and expert consensus statements. Used appropriately, analgesic and adjuvant treatments can and should be employed to relieve persistent pain in the expanding elderly population.

Improving reporting of adverse drug reactions: Systematic review

Background:

Adverse drug reactions (ADRs) are a significant cause of morbidity and mortality, with many being identified post-marketing. Improvement in current ADR reporting, including utility of underused or innovative methods, is crucial to improve patient safety and public health.

Objectives:

To evaluate methods to improve ADR reporting via a systematic literature review.

Methods:

Data sources were Medline, Embase, Cochrane Library and National Library for health searches on ADR reporting (January 1997 to August 2007) including cross-referenced articles. Twenty-four out of 260 eligible studies were identified and critically assessed. Studies were grouped as follows: i) spontaneous reporting (11); ii) medical chart/note review (2); iii) patient interviews/questionnaires (3); and iv) combination methods including computer-assisted methods (8).

Results:

Using computerized monitoring systems (CMS) to generate signals associated with changes in laboratory results with other methods can improve ADR reporting. Educational interventions combined with reminders and/or prescription card reports can improve hospital-based ADR reporting, and showed short to medium term improvement.

Conclusions:

The use of electronic health data combined with other methods for ADR reporting can improve efficiency and accuracy for detecting ADRs and can be extended to other health care settings. Although methods with educational intervention appear to be effective, few studies have reviewed long-term effects to assess if the improvements can be sustained.

The frequency of adverse drug reaction related admissions according to method of detection, admission urgency and medical department specialty

BACKGROUND

Adverse Drug Reactions (ADRs) have been regarded as a major public health problem since they represent a sizable percentage of admissions. Unfortunately, there is a wide variation of ADR related admissions among different studies. The aim of this study was to evaluate the frequency of ADR related admissions and its dependency on reporting and method of detection, urgency of admissions and included medical departments reflecting department/hospital type within one study.

METHODS

The study team of internal medicine specialists retrospectively reviewed 520 randomly selected medical records (3%) of patients treated in the medical departments of the primary city and tertiary referral governmental hospital for certain ADRs causing admissions regarding WHO causality criteria. All medical records were checked for whether the treating physicians recognised and documented ADRs causing admissions. The hospital information system was checked to ensure ADR related diagnoses were properly coded and the database of a national spontaneous reporting system was searched for patients with ADRs included in this study.

RESULTS

The established frequency of admissions due to certain ADRs recognised by the study team and documented in medical records by the treating physicians was the same and represented 5.8% of all patients (30/520). The frequency of ADR causing admissions detected by employing a computer-assisted approach using an ICD-10 coding system was 0.2% (1/520), and no patient admitted due to ADRs was reported to the national reporting system (0/520). The recognized frequency of ADR related admissions also depends on the department's specialty (p = 0.001) and acceptance of urgently admitted patients (p = 0.001). Patients admitted due to ADRs were significantly older compared to patients without ADRs (p = 0.025). Gastrointestinal bleeding due to NSAID, acetylsalicylic acid and warfarin was the most common ADR that resulted in admission and represented 40% of all certain ADRs (12/30) according to WHO causality criteria.

CONCLUSION

ADRs cause 5.8% of admissions in medical departments in the primary city and tertiary referral hospital. The physicians recognise certain ADR related admissions according to WHO causality criteria and note them in medical records, but they rarely code and report ADRs. The established frequency of ADR related admissions depends on the detection method, department specialty and frequency of urgently admitted patients.

Drug information for patients--an update of long-term results: type of enquiries and patient characteristics

PURPOSE

To analyse the type of enquiries to a drug information service in Germany, available exclusively for patients.

METHODS

Sociodemographic characteristics of the patients who used the service, number and kind of drugs taken, existing diseases, reasons for enquiry as well as type of answers provided were recorded. For the present evaluation we analysed all enquiries to the service from August 2001 to January 2007.

RESULTS

A total of 5587 enquiries were received. 5013 enquiries from 4091 patients were available for further analysis in detail. The patient group using the service most frequently were women between 61 and 70 years (23.3%). 1457 enquiries (29.1%) were made by patients who had contacted the information service once or several times before. The group of drugs most often asked about were cardiovascular drugs (33.4%), followed by drugs for the nervous system (16.2%) and for the alimentary tract and metabolism (12.4%). On average, each patient had questions about 2.6 (median 1; 1-22) drugs simultaneously. Common reasons for contacting the service were adverse drug reactions (22.1%), the need for general information about the drug (19.9%), information about therapy (12.4%) and drug interactions (10.2%).

CONCLUSIONS

A lot of patients need additional information about their medication, especially concerning drug groups that are frequently prescribed. The presented drug information service can be one helpful tool to counteract these information deficits and to increase patients' knowledge about their drugs.

Promoting Appropriate Drug Use Through the Application of the Spanish Drug-Related Problem Classification System in the Primary Care Setting

Background:

According to the Second Consensus of Granada (2002), the term drug-related problem (DRP) is defined as a health problem resulting from pharmacotherapy and is considered a negative clinical outcome (ie, a therapeutic objective is not achieved or adverse effects are reported). DRP classification systems used in primary care settings can be useful tools to detect, evaluate, and resolve DRPs.

Objective:

To encourage appropriate drug use in the ambulatory clinical setting through DRP detection and evaluation by means of the Spanish DRP classification system, and to document how pharmacists can help resolve DRPs through interventions with both general practitioners (GPs) and patients.

Methods:

Four pharmacists investigated DRPs in polymedicated patients over a 6-month period. All detected DRPs were grouped into 3 major categories: necessity, effectiveness, and safety. To resolve DRPs, pharmacists performed interventions on GPs and patients. GPs received verbal and written information about DRPs; patient interventions were in the form of private meetings on health education.

Results:

Four hundred twenty-two patients, 80% of whom were aged 65 years or older, were included in the study. Each patient was taking a mean ± SD of 8.1 ± 2.4 medications. Three hundred four medications were associated with 245 DRPs; medications indicated for digestive/metabolic or cardiovascular pathologies were the most prevalent. Most (60%) of the identified DRPs belonged to the effectiveness category, whereas safety issues accounted for 28.6%. The most frequently reported DRP was pathology resistant to treatment (19.6%), followed by nonadherence (16.3%). Of the 215 interventions carried out to resolve these DRPs, 173 (80.5%) were addressed to GPs, who agreed to change therapy regimens on 90.2% of the occasions. Forty-two (19.5%) interventions were addressed to patients. Furthermore, the interventions accepted by GPs and patients resolved 176 (82%) DRPs.

Conclusions:

The current Spanish DRP classification system is a useful tool to systematically detect and document DRPs in daily general practice, in addition, the interventions addressed by pharmacists to GPs and patients resolved most of the detected DRPs.