Risk for definite neuroleptic malignant syndrome. A prospective study in 223 consecutive in-patients

A systematic review and pooled, patient-level analysis of predictors of mortality in neuroleptic malignant syndrome

OBJECTIVE

Neuroleptic malignant syndrome (NMS) is a potentially fatal, idiosyncratic reaction to antipsychotics. Due to low incidence of NMS, research on risk factors of mortality associated with NMS is limited.

METHODS

Two authors independently searched Medline/Embase/Cochrane/CINAHL/PsychINFO databases for case reports with author-defined NMS published in English until 05/30/2020. Demographic, clinical, treatment, and outcome data were independently extracted following PRISMA guidelines. NMS severity was rated using the Francis-Yacoub scale. Mortality risk factors were identified using a multivariable regression analysis including all characteristics that were significantly different between NMS cases resulting vs. not resulting in death.

RESULTS

683 cases with NMS were analyzed (median age = 36 years, males = 62.1%). In a multivariable model, independent predictors of NMS mortality were lack of antipsychotic discontinuation (odds ratio (OR) = 4.39 95% confidence interval (CI) = 2.14-8.99; p < 0.0001), respiratory problems (OR = 3.54 95%CI = 1.71-7.32; p = 0.0004), severity of hyperthermia (Unit-OR = 1.30, 95%CI = 1.16-1.46; p < 0.0001), and older age (Unit-OR = 1.05, 95%CI = 1.02-1.07; p = 0.0014). Even in univariate, patient-level analyses, antipsychotic formulation was not related to death (oral antipsychotic (OAP): n = 39/554 (7.0%) vs. long-acting injectable (LAI): n = 13/129 (10.1%); p = 0.2413). Similarly, death with NMS was not related to antipsychotic class (first-generation antipsychotic: n = 38/433 (8.8%) vs. second-generation antipsychotic: n = 8/180 (4.4%); p = 0.0638). Non-antipsychotic co-treatments were not associated with NMS mortality.

CONCLUSION

Despite reliance on case reports, these findings indicate that presence of respiratory alterations, severity of hyperthermia, and older age should alert clinicians to a higher NMS mortality risk, and that antipsychotics should be stopped to reduce mortality, yet when NMS arises on LAIs, mortality is not increased vs. OAPs.

Electroconvulsive Therapy for Neuroleptic Malignant Syndrome: A Case Series

OBJECTIVES

Neuroleptic malignant syndrome (NMS) is an uncommon condition associated with significant morbidity and mortality. Data on treatment interventions are limited. In this case series, we sought to describe all NMS cases requiring ECT from a large academic institution over a nearly 2-decade period.

METHODS

We retrospectively identified all patients with NMS who were treated with ECT over a 17-year period. Patients were included in the study based on chart review using the International Consensus Diagnostic Criteria for NMS. Data were collected related to clinical findings, treatment course, and response to ECT.

RESULTS

We identified 15 patients meeting the inclusion criteria. Most patients had neurocognitive or schizophrenia spectrum disorders and developed NMS after exposure to multiple antipsychotic drugs. All patients received bitemporal ECT after failed pharmacotherapy for NMS. Electroconvulsive therapy was well tolerated and resulted in a remission rate of 73.3% (n = 11). Patients showed early initial response to ECT (mean of 4.2 treatments), but an average of 17.7 treatments was necessary to minimize recurrence of catatonic signs. One patient died after interruption of the index course of ECT because of severe infection, and another was discharged to hospice care after limited response. These cases highlight the lethality of NMS and its complications despite aggressive treatment measures.

CONCLUSIONS

Bitemporal ECT was well tolerated and effective in treating NMS refractory to pharmacotherapy. We suggest that ECT be considered early in cases of NMS that are refractory to pharmacological interventions, especially if the underlying condition is also responsive to ECT.

Neuroleptic malignant syndrome

Although a rare form of ‘lethal’ catatonia, involving high temperature and rigidity, was first described long before the advent of neuroleptic drugs, Delay's description of a syndrome malin in 1960 is usually regarded as the first recognition of this syndrome. Over the next 20 years the number of case reports grew and the appearance of reviews such as Caroff's in 1980 marked the birth of the neuroleptic malignant syndrome (NMS). Reports of its incidence give variation rates of up to fiftyfold, possibly due to differences in diagnostic criteria, and mortality reports are similarly variable. Although it is debatable whether it is a rare, severe idiosyncrasy or one of many neuromuscular side-effects of dopamine antagonists (Levinson & Simpson, 1986), most clinicians nowadays regard it as a serious but recognisable risk of neuroleptic treatment which merits further attention.

Neuroleptic malignant syndrome: an easily overlooked neurologic emergency

Neuroleptic malignant syndrome is an unpredictable iatrogenic neurologic emergency condition, mainly arising as an idiosyncratic reaction to antipsychotic agent use. It is characterized by distinctive clinical features including a change in mental status, generalized rigidity, hyperpyrexia, and dysautonomia. It can be lethal if not diagnosed and treated properly. Mortality and morbidity attributed to this syndrome have recently declined markedly due to greater awareness, earlier diagnosis, and intensive care intervention. In most cases, the syndrome occurs as a result of a rapid increase in a dose of neuroleptic, especially one of the long-acting ones. Pathophysiology behind this syndrome is attributed to a dopamine receptor blockade inside the neurons rendered by the offending drug and excessive calcium release from the sarcoplasmic reticulum of skeletal myocytes. Laboratory tests, although not diagnostic, may assist in assessing the severity of the syndrome and also the consequent complications. The syndrome has been described in all age groups and occurs more in males than in females. Genetics appears to be central regarding the etiology of the syndrome. Stopping the use of the offending agent, cold intravenous fluids, and removal of the causative agent and its possible active metabolites is the cornerstone of treatment. Periodic observation of psychotic patients recently started on antipsychotic medications, especially those being treated with depot preparations, may aid to an early diagnosis of the syndrome and lead to early treatment.

Catatonia - case report and review

Catatonia is a neuro-psychiatric disorder that can occur in medical, psychiatric and drug-induced conditions but is often unrecognised. A 64 year-old woman was admitted to hospital for assessment of a significant deterioration in her ability to communicate and function normally so that she had become completely dependent on others for all activities of daily living for nearly three years. Outpatient medical and psychiatric assessments failed to clarify diagnosis. On admission to a general hospital, the neurology team initially believed she had a Parkinson's-like syndrome but after further investigation and comprehensive multidisciplinary assessment, including neuro-psychiatric review, she was diagnosed with catatonia. She was subsequently admitted to a psychiatric hospital where she received electro-convulsive therapy and changes to her psychotropic medication regimen. She responded well to treatment and within a short period of time was able to function independently again.

Clinical and pharmacologic risk factors for neuroleptic malignant syndrome and their association with death

AIM

The aim of the present study was to evaluate demographics, clinical features, psychiatric diagnoses and prognosis of neuroleptic malignant syndrome (NMS) reported in Turkey, and to assess their association with mortality.

METHODS

Data on all reported cases of NMS in the Turkish Psychiatric Index between 1985 and 2005 were collected. The type, dosage and administration period of neuroleptics, the clinical and laboratory findings; and prognosis were compared in terms of mortality.

RESULTS

Thirty-six patients with a mean age of 33.67 +/- 16.98 years were identified. Fifteen (41.7%) were diagnosed as having schizophrenia or other psychotic disorders and the same number were diagnosed as having affective disorder. Remaining five (13.9%) were diagnosed with other psychiatric disorders and 1 (2.7%) had no psychiatric diagnosis. Twenty-two (61.1%) of the NMS cases were associated with high potency typical neuroleptics. Association between an atypical antipsychotic and NMS has been reported in one case. NMS appeared within 7 days after initiation of the antipsychotic medication in the majority of samples (n = 19, 52.8%). Several combinations of rescue treatments were used in the majority of cases (n = 19, 52.8%), although bromocriptine (n = 22, 61.1%) was the most frequently preferred rescue treatment for NMS. Benzodiazepines were significantly better than the other treatment options in preventing mortality. Five out of the 36 patients (13.9%) with NMS had died. Age was the only significant independent factor that was associated with mortality.

CONCLUSIONS

Benzodiazepines may be included in the treatment of NMS. The mortality rate due to NMS in Turkey was lower than the previously reported rates from other developing countries.

Maximal response to electroconvulsive therapy for the treatment of catatonic symptoms

OBJECTIVES

Because the number of medical lawsuits has recently increased in Japan, doses of medication above the upper limits have recently been avoided, even when treating catatonic patients. We treated catatonic symptoms with drugs within the upper limit of dosage and electroconvulsive therapy (ECT) to determine the maximal response.

METHODS

We examined 50 consecutive patients with catatonic symptoms admitted to a university hospital during a 32-month period who were treated with either drugs within the upper limit or ECT.

RESULTS

Response rates were as follows: ECT, 100%; chlorpromazine, 68%; risperidone, 26%; haloperidol, 16%; and benzodiazepines, 2%.

CONCLUSIONS

The findings indicated that ECT is the treatment of choice for catatonic symptoms.

Meta-analytic evidence of systematic bias in estimates of neuroleptic malignant syndrome incidence

OBJECTIVE

The aim of this study was to examine published reports for sources of excessive variance in neuroleptic malignant syndrome (NMS) incidence estimates.

DATA SOURCES

An unrestricted computerized MEDLINE search was conducted with a comprehensive search logic and supplemented by secondary references and a manual search of an extensive personal library.

STUDY SELECTION

Studies were analyzed if they presented original data and provided at least 2 of the following: number of NMS cases, number of patients at risk, or ratio of cases to patients at risk. Twenty-six of the 28 candidate studies met these minimal criteria.

DATA EXTRACTION

Variables included incidence, year of study publication, mean year of NMS occurrence, patient population at risk, study design, diagnostic criteria, and country of origin.

DATA SYNTHESIS

Standard error, which reflects study size, accounted for 90.8% of the variance (beta = .953, P < .001) in this international series of 26 NMS incidence estimates. Incidence was significantly lower in 7 studies the time end points of which were set in advance of case identification (chi(2) = 71.08, P < .001). No other variable was significantly related to incidence.

CONCLUSIONS

Neuroleptic malignant syndrome incidence estimates to date are non-trivially biased such that larger study size (patients at risk) is strongly related to lower observed incidence. Future studies can minimize the contribution of this and other sources of experimental error by incorporating several very feasible recommendations.

The catatonic dilemma expanded

Catatonia is a common syndrome that was first described in the literature by Karl Kahlbaum in 1874. The literature is still developing and remains unclear on many issues, especially classification, diagnosis, and pathophysiology. Clinicians caring for psychiatric patients with catatonic syndromes continue to face many dilemmas in diagnosis and treatment. We discuss many of the common problems encountered in the care of a catatonic patient, and discuss each problem with a review of the literature. Focus is on practical aspects of classification, epidemiology, differential diagnosis, treatment, medical comorbidity, cognition, emotion, prognosis, and areas for future research in catatonic syndromes.

Les traitements adjuvants au cours de l’épisode maniaque

When treating patients with manic states, the physician has to deal with at least two main Issues. First, the therapeutic decision has to be rapid because of the unpredictability of its immediate course. This concerns often results in polypharmacy with adjunct treatments. However, the therapeutic choice has to be cautious since part of the treatment will be maintained for prophylaxis. According to recent guidelines, the use of monotherapy with mood stabilisers during acute manic states concerns only few patients with mostly hypomania to moderate mania. Up to date, antipsychotics and benzodiazepines are considered as adjunct treatment in mania with psychotic symptoms or hostility. However, survey studies show that antipsychotics are widely used as adjunct treatments to mood stabilisers, indeed beyond the indications held by the guidelines. Our objective was to describe the clinical situations justifying the addition of an adjunct treatment during acute mania and to clear up from published data, the advantages and the inconveniences of combining antipsychotics and/or benzodiazepines with a mood stabilisers in order to define differentiated indications. Mania associated with either agitation, sleep disturbances or psychotic symptoms requires most of the time to combine mood stabiliser and respectively, sedative and/or anxiolytic, hypnotic or anti-psychotic treatments. Patients suffering from mania associated with other disorders need specific treatment adjustment and combination related to their medical condition. Adjunctive conventional antipsychotic remains widely used in first intention treatment. The conventional antipsychotic is often prescribed alone in the first weeks prior to the association with a mood stabiliser. Nevertheless there are controversies in the literature about their efficiency and their delay of action with regard to other treatments. When the conventional antipsychotic is a part of their initial treatment, manic patients remain taking them when discharged from hospital and are still taking them after 6 Months in a great percentage of the cases. The adverse events with conventional antipsychotic are numerous and severe enough in bipolar patients to restrict their use in first intention mainly to psychotic mania. Moreover, there are evidences for higher sensitivity to adverse effects of the conventional antipsychotics in manic patients. When agitation in acute mania requires an adjunct to mood stabiliser, the conventional antipsychotic treatment could be use for over-excitation without catatonic features and with particular care with the risk of akathisia. Long term effects of conventional antipsychotics, especially on depressive recurrences, should argue to stop them as soon as possible. Since the safety of adjunctive new antipsychotics with mood stabilisers seems until now acceptable, its indication should be limited to acute psychotic manias. Adjunctive benzodiazepine, should be evaluated in the various types of mania with specific concerns with comorbidity frequently met in consultation-liaison psychiatry. Benzodiazepines plus mood stabilisers may be the treatment of choice for the manias in which anxious state, catatonic symptoms or sleeplessness.

Precautionary measures reduce risk of definite neuroleptic malignant syndrome in newly typical neuroleptic-treated schizophrenia inpatients

Neuroleptic malignant syndrome (NMS) is a potentially lethal antipsychotic drug (APD)-induced thermoregulatory disturbance. We hypothesized that several precautionary measures taken after administeration of APDs might prevent progression to definite NMS. The study group included 657 consecutively admitted drug-free schizophrenia inpatients who received various typical APDs for 28 days. Specific predefined precautionary measures were employed for this group. The comparison group (n=192) consisted of typical APD-treated schizophrenia inpatients in whom such precautionary measures were not imposed. The study group exhibited a significantly lower incidence of definite NMS (1/657=0.2% versus 4/192=2.1%; P=0.01, odds ratio=13.96; 95% confidence interval 1.55-125.63). Antipsychotics were discontinued in 28 patients (28/657=4.3%) from the study group due to NMS (n=1) or early detection of potential NMS-related signs (probable abortive NMS) (n=27). Our findings suggest that specific precautionary measures can effectively reduce the incidence of definite NMS by approximately one order in newly medicated schizophrenia inpatients.

Risk factors in neuroleptic malignant syndrome. A case-control study

OBJECTIVE

To determine whether environmental temperature, agitation, neuroleptic use, mental retardation, and affective disorders were risk factors for neuroleptic malignant syndrome (NMS).

METHOD

Cases and age- and sex-matched psychiatric controls admitted to a regional acute psychiatric unit over a 10-year period.

RESULTS

Both uni- and multivariate analysis revealed statistically significant differences between patients with NMS (n=15) and controls (n=45) with regard to the presence of mental retardation, psychomotor agitation, and a number of variables relating to neuroleptic use (newly introduced or increased, intramuscular administration, and dosage). We found no differences between NMS patients and psychiatric controls in respect of changes in environmental temperature.

CONCLUSION

Our study supports the need for caution when using intramuscularly administered, abruptly increasing, high-dose neuroleptics, particularly in mentally retarded or agitated patients, regardless of environmental temperature.

High serum creatinine kinase level: possible risk factor for neuroleptic malignant syndrome

High creatinine kinase (CK) levels and leukocytosis are known to be associated with neuroleptic malignant syndrome (NMS). The authors sought to determine if their presence during non-NMS psychotic episodes is predictive of the later development of NMS. Sixteen psychotic inpatients who met the criteria for NMS were included. For statistical comparison, two control groups were formed by matching each study patient with two non-NMS patients for age, gender, ethnicity, and year and ward of hospitalization (n = 32). The maximal individual serum levels of CK, lactate dehydrogenase (LDH), serum glutamic oxaloacetic transaminase (SGOT), and white blood cell count (WBC) during all non-NMS psychotic episodes (Brief Psychiatric Rating Scale 40) were averaged. To normalize the distribution, the individual averages were transformed to natural logarithms (Ln). Mean Ln (average [CK]) in the patients with NMS was found to be 6.46 +/- 0.91 IU/L, and in the non-NMS patients, 5.24 +/- 0.90 IU/L (actual serum CK levels, 911 +/- 747 IU/L and 343 +/- 620 IU/L, respectively). This difference was statistically significant (F [2,15] = 10.5, p < 0.0001). In addition, CK levels above the upper limit of normal were noted in 76% of psychotic episodes in the patients with NMS and in only 30% of psychotic episodes in the non-NMS patients (p < 0.0001). There was no significant difference between the NMS and non-NMS groups in Ln(LDH), Ln(SGOT), or Ln(WBC) (F [2,15] = 1.4, 2.1, and 0.9, respectively). The authors concluded that high serum CK level during non-NMS psychotic episodes seems to be a risk factor for future NMS. Therefore, CK measurement may be justified on admission of acutely psychotic patients who have other risk factors and a history of psychosis-associated CKemia.

Frequency of neuroleptic malignant syndrome in a large psychiatric hospital in Moscow

A ten-year prospective survey of neuroleptic malignant syndrome (NMS) was performed in a major psychiatric hospital (1,510 beds) in Moscow. All inpatients who developed a persistent and severe extrapyramidal rigidity accompanied by fever after exposure to neuroleptic medication were screened for NMS. The diagnosis of NMS was established according to Levenson's criteria and at a later stage all NMS cases were reevaluated using the DSM-IV research criteria. Data on age, gender and psychiatric diagnoses were analyzed. Of the 78,708 inpatients treated with neuroleptic agents, 19 separate patients had an episode of NMS, for a frequency of 0.02%. Mortality rate was 10.5% (2/19 patients). Of the three potential risk factors studied, only young age (</= 25 years) was significantly associated with an increased frequency of NMS (P < 0. 01). The low rate of NMS found here compared to studies in other countries may be due to the stringent demands for NMS diagnosis. More large-scale prospective studies including detailed clinical and laboratory data are needed to clarify these differences and their impact on the prevalence and risk factors of NMS.

Clinical and pharmacologic risk factors for neuroleptic malignant syndrome: a case-control study

BACKGROUND

Pharmacologic and clinical risk factors for neuroleptic malignant syndrome have been suggested. High neuroleptic dose, rapid dosage increase, and parenteral administration were identified as risk factors in a case-control study; however, there are limited data regarding potential clinical risk factors.

METHODS

To examine potential clinical risk factors, we conducted a case-control study, comparing 12 cases to 24 controls, all treated with neuroleptics at our center. In addition to examining previously postulated pharmacologic risk factors, we also assessed for presence of psychomotor agitation, confusion, disorganization, and catatonia.

RESULTS

Significant differences were found between cases and controls for psychomotor agitation, confusion, disorganization, catatonia, mean and maximum neuroleptic dose, parenteral neuroleptic injections, neuroleptic dose increase within 5 days of the episode, magnitude of neuroleptic dose increase from initial dose, and extrapyramidal signs.

CONCLUSIONS

This study demonstrated that psychopathological features such as psychomotor agitation, confusion, disorganized behavior, and catatonia may be risk factors for the neuroleptic malignant syndrome, in addition to pharmacologic risk factors and extrapyramidal signs, including akathisia. In clinical practice, careful monitoring for prodromal signs of neuroleptic malignant syndrome is required during neuroleptic treatment of patients with psychomotor agitation, confusion, and/or disorganization, while in the presence of catatonia these drugs should be avoided.

The emerging role of clozapine in the treatment of movement disorders

Clozapine, the only commercially available atypical neuroleptic, is approved for the treatment of schizophrenic patients who are unresponsive to or intolerant of typical neuroleptics. It has an unusual pharmacologic profile compared with standard neuroleptics, and it follows that clinical response to this drug is also different. It has shattered the notion that a drug must be capable of inducing or worsening parkinsonism to be a potent antipsychotic. Based on these findings, it is being used increasingly by neurologists for psychiatric and nonpsychiatric problems in patients with movement disorders. The most common use for clozapine among neurologists is in the management of drug-induced psychosis in Parkinson's disease (PD). This problem has been a source of increased morbidity and mortality in PD because of a lack of adequate therapeutic intervention. At this time, because of success in numerous open trials, with improvement of > 80% of patients, clozapine therapy for psychosis in PD is becoming the standard of care. It also appears to be of value in the management of some motor features of PD, including tremors and dyskinesia and possibly even sensory symptoms such as akathisia and pain. The literature also suggests that clozapine may be of potential benefit in hyperkinetic movement disorders including essential tremor, Huntington's disease, and tardive dyskinesia. We review the current data concerning the use of clozapine in patients with these movement disorders and others.