Patient Safety Tip of the Week

 

March 20, 2012

Adverse Events Related to Psychotropic Medications

 

 

We’ve seen an explosive growth in the prescription of psychotropic medications in the past decade so it should come as no surprise that we are also seeing more frequent adverse events related to them.

 

Studies on inpatient psychiatry units have revealed overall rates of adverse drug events and medication errors to be similar to those seen on general hospital patients (Rothschild 2007). Of the psychotropic drugs the class of atypical antipsychotic drugs accounted for the most adverse drug events.

 

A couple articles recently have highlighted some of the issues related to psychotropic drugs. The first was one regarding the relative risk of death in older residents of nursing homes prescribed antipsychotic medications (Huybrechts 2012). It has been known for some time now that the atypical antipsychotic drugs were associated with an increased risk of cerebrovascular incidents and death. In 2005 the FDA added black box warnings about the risk for death for these drugs when used in the elderly with dementia and then added similar warnings in 2008 for the more traditional antipsychotic drugs. Yet they continue to be widely prescribed in the nursing home setting. The Huybrechts paper quantifies the risks of the individual drugs in the nursing home setting. They used a large Medicare and Medicaid dataset and were able to determine the relative mortality risks for a variety of the antipsychotic drugs relative to their reference drug resperidone. They found that haloperidol had over double the risk of death compared to resperidone and that the effects were strongest shortly after starting the drug. Quetiapine had a slightly reduced risk compared to resperidone and most of the other antipsychotics had risks similar to resperidone. In general, the risks increased as the dosage was increased for all the drugs except quetiapine. It’s hard to justify use of these drugs in this population, given their limited efficacy and these significant risks. The authors caution that, when they must be used (when non-pharmacologic interventions have failed), they should be used in the lowest doses possible and the patients should be carefully monitored.

 

The second article was an analysis by ISMP Canada of incidents involving psychotropic medications (ISMP Canada 2012). They found that of almost 80,000 medication incidents reported over an 11-year period 7.4% involved psychotropic medications. And of the latter 2.3% were associated with patient harm. They found incidents spanning nearly all healthcare settings and several themes were seen in three main settings: the community, the hospital, and the long-term care settings.

 

In the community setting they found 3 main themes: (1) multiple medication theme (2) incorrect medication theme and (3) incorrect patient theme. They point out that in patients taking multiple psychotropic medications it is often difficult to sort out what side effects are due to which medication and which might be due to the underlying condition. They also saw cases where the patient was given the wrong medication and it was incorrectly assumed by the patient they had been switched to a different brand of the intended medication. And they note that medications for spouses (or other family members sharing the same last name) may be mixed up in pharmacies or at home.

 

In the long-term care setting they note that patients are particularly susceptible to the effects of multiple medications and that the elderly are more susceptible to the harmful effects of medications for a variety of physiologic reasons. Here also the means by which medications are administered may lead to the wrong patient getting a medication. An example they give is one in which a medication for one patient was put in the patient’s cereal. However, the patient was not given the cereal immediately and another patient inadvertently ate the cereal. They note that if this route is taken the medication should be mixed in with a minimal amount of food and immediately given to the patient.

 

In the hospital setting, one variation of the multiple medications theme was patients taking medications they brought in from home. All hospitals must have strict policies for sequestering medications brought in from home or sending those medications back home with family or other caregivers. In those rare cases where a medication from home must be administered, it should be stored and dispensed by the hospital pharmacy and subject to all usual safety measures used by the hospital (barcoding, etc.). Another common problem they encountered in medication reconciliation is when only the labels from the medication bottles from home are read. Patients may be taking only half the dose that was printed on the label or taking one every other day or some other regimen. Another theme they see in hospitals is the incorrect dose theme, in particular related to verbal orders in which hear-back and read-back are not properly used. Lastly, the dose omission theme appears when a medication is intentionally or unintentionally left off a medication list. When the patient then transitions to another level of care the medication never gets restarted. They provide an example of a patient going through a withdrawal syndrome from such inadvertent discontinuation of a psychotropic drug. Such withdrawal symptoms may lead to misdiagnoses if the possibility of drug withdrawal is never considered. (See our August 30, 2011 Patient Safety Tip of the Week “Unintentional Discontinuation of Medications After Hospitalization” for an estimate of how often such inadvertent discontinuations occur).

 

 

In regard to the multiple medication theme it is important to note the tremendous increase in psychotropic polypharmacy in the past decade or so. One study (Mojtabai 2010) looking at office-based psychiatry practices showed that the median number of psychotropic medications prescribed at each visit increased from one in 1996 to two in 2006. These included many instances of patients receiving 2 or more antidepressants, 2 or more antipsychotics, or 2 or more sedative/hypnotics. The authors note that the evidence base for such combination therapy is often lacking. Moreover, off-label use of antipsychotics has also become very common (Leslie 2012).

 

There are also some unique problems with medication reconciliation and psychotropic drugs. For a variety of reasons patients may not reveal that they are taking such drugs. And even when you populate your medication reconciliation forms by downloads from your RHIO or from third party vendors like PBM’s psychotropic drugs are typically excluded because of specific legal confidentiality provisions.

 

 

While research into psychotropic medication errors and adverse events has been scant on the inpatient side, there has been almost no literature on the outpatient side. One paper (Maidment 2009) discusses some of the issues involved on the outpatient side. Some are service operational issues, such as delivery of behavioral health care across multiple transitions, with the associated problems in communication across providers, fragmented roles and responsibilities. As above, medication reconciliation is a process particularly vulnerable to error. The Maidment paper notes a study (Morcos 2002) in a mental health facility that demonstrated discrepancies in medication reconciliation in 43% of admissions and 69% of discharges. A second issue identified by Maidment et al. is the fact that many patients with mental health illnesses have multiple physical comorbidities and complex medication regimens. A third issue is the lack of training and familiarity with certain classes of medication. Many adverse drug events on behavioral health units are due to non-psychotropic drugs (eg. insulin) that the behavioral health staff is less familiar with. In the Rothschild study (Rothschild 2007) non-psychiatric drugs accounted for only 4% of the errors but they accounted for a third of the potentially preventable events on psychiatric units. Likewise, many of the psychotropic drug adverse events seen on general med/surg units likely reflects a similar unfamiliaritiy with those drugs. And that problem of unfamiliarity with psychotropic drugs is now extending to the primary care. And a fourth issue is the cognitive impairment and communications problems that may prevent a patient with mental health problems from helping avoid medication errors. More than that, levels of distrust between patients and professionals may further compromise the situation.

 

More and more, because of the shortage of psychiatrists nationwide, primary care physicians are managing more behavioral health conditions like depression. But in many cases they may be relatively uncomfortable managing some of the psychotropic agents needed. Many communities are adopting the DIAMOND model (ICSI 2007) for management of depression in the primary care setting. That model is based on the great work from the IMPACT study led by the University of Washington. That approach utilizes the PHQ-9 for both screening and monitoring outcomes, a stepped care approach for treatment modification and intensification, and use of care coordinators embedded in the primary care practices. However, one of the key elements is a regular interaction with a psychiatrist or other behavioral health provider. At those regular sessions specific questions about psychotropic drugs are often discussed.

 

 

We all know about the parkinsonian side effects, tardive dyskinesias and other movement disorders plus sexual dysfunction and orthostatic hypotension that may result from many psychotropic medications. Obesity, insulin resistance, and the metabolic syndrome are some of the serious complications of atypical antipsychotics. But there are multiple other potentially serious complications of some psychotropic drugs that are, fortunately, relatively infrequent. The best known are the neuroleptic malignant syndrome and the serotonin syrndrome. In our June 29, 2010 Patient Safety Tip of the Week “Torsade de Pointes: Are Your Patients At Risk?” we discussed how some drugs may prolong the Q-T interval and lead to ventricular tachycardia. Our October 2010 What’s New in the Patient Safety World column “Antipsychotic Drugs and Venous Thrombembolism” noted that there is an increased risk of venous thromboembolism with antipsychotic drugs, though the overall risk is relatively low. And a recent study (Jambet 2012) described a fatal abdominal compartment syndrome in 2 patients taking multiple psychotropic drugs.

 

 

So are there interventions known to help minimize adverse drug events related to psychotropic drugs? A study (Jayaram 2011) in a hospital setting found that an error reporting system in conjunction with CPOE (computerized physician order entry), education, and continuous feedback on errors resulted in a significant reduction in such medication adverse events. Case ascertainment in that study was limited and it is not known whether the results can be applied to other settings, such as the outpatient setting, but the results are promising. Grasso and colleagues (Grasso 2003) also look to the promise of CPOE in preventing such errors but also point out the utility of the iPhone or other PDA you probably have with you now in providing useful information about these drugs. They recommend use of protocols or order sets, particularly for those drugs with narrow therapeutic windows, and use of decision support tools to identify other conditions (diagnoses or lab results) that might lead to changing orders for psychotropic drugs. And education of physician and nursing staffs and patients themselves are important.

 

To that we’d add the need to establish formal auditing when prescribing psychotropic drugs. For each you should have a formal protocol specifying which common side effects to look for and when to look.

 

We think that ultimately we’ll need more sophisticated monitoring programs, perhaps similar to how we use trigger tools, to monitor for both adverse drug events and medication errors. However, what is clear is that there is currently a paucity of high quality systematic studies on ADE’s and errors related to psychotropic drugs and how to prevent them.

 

 

References:

 

 

Rothschild JM, Mann K, Keohane CA, et al. Medication safety in a psychiatric hospital. General Hospital Psychiatry 2007; 29(2): 156-162
http://www.sciencedirect.com/science/article/pii/S0163834306002222

 

 

Huybrechts KF, Gerhard T, Crystal S, et al. Differential risk of death in older residents in nursing homes prescribed specific antipsychotic drugs: population based cohort study. BMJ 2012; 344:e977 (Published 23 February 2012)

http://www.bmj.com/highwire/filestream/569706/field_highwire_article_pdf/0.pdf

 

 

ISMP Canada. Analysis of Harmful Medication Incidents Involving Psychotropic Medications. ISMP Canada Safety Bulletin 2012; 12(2): 1-5 March 6, 2012

http://www.ismp-canada.org/download/safetyBulletins/2012/ISMPCSB2012-02_Analysis_of_Harmful_Med_Incidents_Involving_Psychotropic_Meds.pdf

 

 

Mojtabai R, Olfson M. National Trends in Psychotropic Medication Polypharmacy in Office-Based Psychiatry. Arch Gen Psychiatry 2010; 67(1): 26-36

http://archpsyc.ama-assn.org/cgi/content/full/67/1/26

 

 

Leslie DL, Rosenheck R. Off-Label Use of Antipsychotic Medications in Medicaid. Am J Manag Care 2012; 18(3): e109-e117

http://www.ajmc.com/articles/Off-Label-Use-of-Antipsychotic-Medications-in-Medicaid

 

 

Maidment ID, Parmentier H. Medication error in mental health: implications for primary care. Ment Health Fam Med. 2009; 6(4): 203–207

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2873876/pdf/MHFM-06-203.pdf

 

 

Morcos S, Francis S-A, Duggan C. Where are the weakest links?: A descriptive study of discrepancies in prescribing between primary and secondary sectors of mental health service provision. Psychiatric Bulletin 2002; 26: 371-374

http://pb.rcpsych.org/content/26/10/371.full

 

 

ICSI. DIAMOND Initiative. Depression Improvement Across Minnesota. 2007

http://www.icsi.org/colloquium_-_2007/diamond_panel.html

 

 

IMPACT. Evidence-Based Depression Care.

http://impact-uw.org/

 

 

Jambet S, Guiu B, Olive-Abergel P, Grandvuillemin A, et al. Psychiatric drug–induced fatal abdominal compartment syndrome. American Journal of Emergency Medicine 2012; 30(3): 513.e5-513.e7

http://www.ajemjournal.com/article/S0735-6757%2811%2900014-3/fulltext

 

 

Jayaram G, Doyle D, Steinwachs D, Samuels J. Identifying and Reducing Medication Errors in Psychiatry: Creating a Culture of Safety Through the Use of an Adverse Event Reporting Mechanism. Journal of Psychiatric Practice. 17(2):81-88, March 2011

http://journals.lww.com/practicalpsychiatry/Abstract/2011/03000/Identifying_and_Reducing_Medication_Errors_in.2.aspx

 

 

Grasso BC, Rothschild JM, Genest R, Bates DW. What Do We Know About Medication Errors in Inpatient Psychiatry? Joint Commission Journal on Quality and Safety 2003; 29(8): 391-400

http://www.psych.org/Departments/QIPS/Downloads/what%20do%20we%20know%20about%20medication%20errors%20in%20inpatient%20psychiatry%20jcaho%20journal%20on%20healthcare%20quality%20august%202002.aspx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 


 

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