1
A comparison between the UK and a Malaysian setting of antipsychotic
prescribing on forensic wards using Prescribing Observatory for Mental
Health-UK standards.
Authors
Dr D. Johnson, MRCPsych, MSc., Clinical Senior Lecturer in Mental Health, Newcastle
University Medicine Malaysia (NUMED). (Main author)
Dr Y Badi’ah, MBBS, Specialist in Forensic Psychiatry, Hospital Permai, Johor
Bahru, Johor.
(Contributing author)
Address for correspondence
Dr Dominic Johnson
Clinical Senior Lecturer in Mental Health Newcastle University
Medicine Malaysia (NUMED)
No.1, Jalan Sarjana 1 Kota Ilmu,
Educity@Iskanadar
79200 Nusajaya
Johor.
Direct: 07-5553824
H/P- 0127793356
Fax : 07-5553888
Email : dominic.johnson@newcastle.edu.my
Word countPaper-1373
Abstract- 124
No of figures- 1
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Abstract
Introduction
Clinical guidelines recommend the use of a single antipsychotic drug at standard
doses. In clinical practise high-dose and combined antipsychotics are common.
Methods
A clinical audit of antipsychotic prescribing for patients in a forensic ward in a
Malaysian hospital was undertaken using Prescribing Observatory for Mental HealthUK (POMH) standards and compared to POMH data.
Results
The level of high dose prescribing between Malaysian and the UK was comparable.
There were low levels of the use of ‘as required’ (PRN) medication in Malaysia
compared to the UK. The use of combined prescribing was more common in
Malaysia.
Discussion
Levels of high dose antipsychotic prescribing are unsatisfactory across both
jurisdictions. Specific quality improvements in Malaysia need to centre on the use of
combination antipsychotics.
Key words- forensic, antipsychotic, high dose,
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Introduction
The Prescribing Observatory for Mental Health-UK (POMH-UK) is a national quality
improvement programme open to all National Health Service (NHS), private and notfor-profit providers of mental health services (Healthcare Organisations; Trusts) in
the UK. POMH-UK facilitates a programme of topic-based audits. This audit
compares data to a 12-month re-audit for the POMH-UK Topic 3: Prescribing highdose and combination antipsychotics on forensic wards. A baseline audit was
conducted in March 2007. The same 21 Trusts/organisations participated in the 12month re-audit in March 2008, submitting data for 1997 patients from 184 wards (72
high-secure and 112 medium or low-secure wards).
While there is considerable evidence for the effectiveness of antipsychotic drugs in
the treatment of psychosis1, there is no evidence to suggest that doses of
antipsychotics higher than the recommended dosages are more effective than
standard doses2. This also appears to hold true for cases where standard doses
have failed to produce any benefit. The controlled studies comparing very high doses
of first-generation antipsychotics with standard dosage regimens for treatment
resistant schizophrenia all failed to show a significant advantage for the high dosage
3, 4.
Further, higher doses have a greater risk of dose-related side effects.
Sometimes people receive more than one antipsychotic because they are switching
from one antipsychotic to another, and there is cross-tapering of the doses of both
drugs in the transition phase. Some people are prescribed a second antipsychotic
drug ‘PRN’ for the management of disturbed behaviour. For others, combined
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antipsychotics are prescribed because a patient’s response to a single antipsychotic
has proved less than satisfactory and it is hoped that the addition of another will lead
to an enhanced therapeutic effect. The literature in this area suggests that the
potential for harm may outweigh the potential for benefit; there is no convincing
evidence that symptoms improve
5, 6
and patients who are prescribed combinations
are more likely to receive a high total antipsychotic dose 7 , experience side effects
and spend longer in hospital6. In the longer term, there is tentative evidence that
mortality may be increased8.
The primary driver for admission to secure care is violence. In people who have
schizophrenia, the risk of violence is increased by the presence of co-morbid
antisocial personality disorder9, and further increased by co-morbid substance
misuse10. The potential consequences of poorly controlled psychotic symptoms,
possibly compounded by co-morbid personality disorder and continued substance
misuse, increase the risk of violence. Effective interventions to reduce this risk, and
thereby to allow transfer to a less secure setting, are a priority. For many patients in
tertiary settings, all evidence-based pharmacological approaches may have been
exhausted.
This study sought to examine the differences in prescribing practices of high dose
antipsychotics of forensic wards in Malaysian and the UK.
Method
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A clinical audit of patient case notes and drug charts of current in-patients who had
been prescribed one or more antipsychotics was performed on a forensic
rehabilitation ward in Hospital Permai, Johor Bahru, Malaysia.
Audit standards were derived from the Consensus statement on the use of high dose
antipsychotic medication – Royal College of Psychiatrists (CR138) and the standards
used in the POMH-UK Topic 3: Prescribing high-dose and combination
antipsychotics on forensic wards and treatment guidelines.
The flowing standards were examined-
1. How many patients received high dose as calculated using the calculation
matrix used by POMH.
2. To what extent was this single or combination therapy or due to the use of
PRN medication
3. Where combination medication was been used was there evidence in the
clinical record stating a reason why?
4. Where any measures been taken to monitor those prescribed high dose
medication?
No record was noted of ‘stat’ medication prescribed.
The following information was collected:- demographic variables (age, gender,);
clinical variables (diagnostic grouping, legal status, length of stay) and information
related to the standards set above. Data was collected and analysed in MS Excel.
The audit data was collected in September 2011.
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Results
In total 36 patients of a total of 57 were audited, all patients were male. Patients
were selected at random using a computer generated random number allocation.
The only patients excluded were those on no form of antipsychotic medication. No
patients were needed to be excluding using this criteria.
The average age was 42.75 years, with a median (middle value) of 41.0 years, and a
mode (most common value) of 35 years. There was a range of 44 years with a
minimum age of 22 to a maximum of 66. All the patients were held under the
Criminal Procedure Code (CPC) of Malaysia. Twenty four (67%) patients were held
under Section 348 and twelve (33%) under Section 344.
The case note primary diagnosis was schizophrenia- 31 patients (86%), learning
disability- 3 patients (8%), bipolar affective disorder -1 patient (3%) and organic- 1
patient (3%). The average length of stay was 180 months.
With regard to the level of usage of different classes of antipsychotic medication, see
figure 1 below.
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Figure 1- Patient number and class of antipsychotic prescribed.
Depot-16
Atypical-20
Typical-7
Clozapine-11
In ten (28%) patients high dose antipsychotic prescribing was noted. All those on
high dose medication were also on multiple antipsychotic medications. In another
nine (25%) patients antipsychotic were prescribed in combination but not in high
dose. Of those prescribed high dose antipsychotics, a clear reason for use was
documented in the clinical record in 5 (50%) cases.
With regard to investigations to monitor high dose anti psychotic use, 3 patients
(33%) had evidence of this in the clinical record. Two of these had an ECG in their
notes and one had evidence of blood monitoring.
There was no use of PRN antipsychotic medication.
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Discussion
The rate of high dose antipsychotic prescribing was comparable between the two
jurisdictions with 28% noted on the Malaysian forensic ward and 32% being the
average from the POMS re-audit in 2008
11.
Of the Malaysian sample, 53% were on
combination antipsychotic medication compared to 40% in the POMS sample. Unlike
the POMS sample, where most combination prescriptions included PRN (71%),
there was no use of PRN in the Malaysian sample.
A number of limitations apply to this audit. Firstly what was measured was
prescribed medication, not administered medication. One cannot be certain that
patients received what was prescribed. The Malaysian data is based on limited
numbers compared to the POMH data with obvious implications for reliability. Also
comparing data across two different jurisdictions raises the issue of the validity of
such a comparison. The results of a retrospective review of patients admitted for
violence to a forensic ward in Malaysia12 are comparable to those of a U.K. forensic
population13. However length of stay was not taken into consideration. The patients
assessed in Malaysia were on a forensic rehabilitation ward for serious offenders
with an average length of stay of 180 months. This contrasts with the broader
spectrum of mentally disordered offenders across a number of settings in the POHM
data where the average length of stay is considerably less13. This difference could
the comparison of the prescribing patterns.
Improvement in reducing the use of combination anti-psychotics along with
increasing the monitoring and documentation of a rationale behind its use in the
Malaysian setting is a priority. Feedback and local training will be the first stage in
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this. The use of the POHM Ready Reckoner which is a simple tool for easy
calculation of whether a single or combined antipsychotic dose is within or greater
than 100% of the BNF recommended maximum, could be promoted within the
Malaysian setting. Involvement of clinical pharmacists to monitor this area in the face
of stretched medical resources in Malaysia could also play a vital role. Improvement
in access to psycho-social interventions could represent another means to reduce
combination prescribing. Re-audit would play an obvious role though improvement
can be difficult to achieve14.
Why the low rates of use of PRN in Malaysia compared to the U.K.? The lack of use
of PRN could represent a cultural difference between the two jurisdictions, it could
represent a consequence of the use of alternate methods of dealing with acute
disturbance such as de-escalation skills or be related to the access of medical input
given high patient to doctor ratio in Malaysia compared to a UK setting.
Rates of high doses prescribing were similar in Malaysia and the U.K. Both
jurisdictions have challenges, though on different fronts, to improve this area of
practice.
Acknowledgments
Dr S. Hafizah for her help in data collection.
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