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*Corresponding Author: Saeed Shoja Shafti, Professor of Psychiatry, University of Social welfare and Rehabilitation sciences, Razi Psychiatric Hospital, Tehran, Iran.
Citation: Shoja Shafti S., Memarie A., Rezaie M., Hamidi M. (2019) Evaluation of Hyponatremia Among Psychiatric Inpatients: A Preliminary Local Appraisal, J Neurodegeneration and Neurorehabilitation. 2(1); Doi: 10.31579/2692-9422/004
Copyright: © 2019 Saeed Shoja Shafti. This is an open-access article distributed under the terms of The Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Received: 18 November 2019 | Accepted: 26 December 2019 | Published: 30 December 2019
Keywords: hyponatremia; psychiatric disorders; psychotropic drugs; schizophrenia
Introduction: Hyponatremia is one of the most frequent ion and water disorders and severe hyponatremia is associated with well-known clinical symptoms and manifestations. In the present assessment the incidence and clinical profile of hyponatremia have been probed among a great sample of non-western psychiatric inpatients and compared with the available data in literature regarding prevalence and other associated clinical characteristics.
Methods: All inpatients with idiopathic hyponatremia during the last sixty-four months had been included in the present study. Clinical diagnosis, as well, was in essence based on ‘Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5)’. Statistical significance had been defined as a p value ≤0.05.
Results: While the annual incidence of hyponatremia in current evaluation was around 0.01%, the annual incidence of mortality due to hyponatremia was around 0.001%. It was significantly more prevalent among male psychiatric inpatients (p<0.04) and patients with duration of illness in excess of one year (p<0.04). Furthermore it was meaningfully more evident among schizophrenic patients (p<0.007), in comparison with remaining primary psychiatric disorders. There was no significant relationship between hyponatremia and symptomatic profile, or serum level of sodium and occurrence of seizure.
Conclusion: Hyponatremia was significantly more prevalent among male patients and cases with duration of illness in excess of one year. Furthermore it was meaningfully more evident among schizophrenic patients.
Hyponatremia (serum sodium concentration < 136>
Razi psychiatric hospital in south of capital city of Tehran, as one of the largest and oldest public psychiatric hospitals in the Middle East, which has been established formally in 1917 and with a capacity around 1375 active beds, had been selected as the field of study in the present retrospective assessment. For evaluation, all inpatients with idiopathic hyponatremia during the last sixty-four months had been included in the present study. Hyponatremia had been detected during systematic baseline laboratory checkups or later as a result of clinician’s request and examination due to various symptoms or signs. Clinical diagnosis, as well, was in essence based on ‘Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5)’ [15]. Among eighteen detected cases, twelve patients were male and six patients were female. Also, the necessary general permission had been obtained from the patients or their relatives during admission. The mean age of samples, as well, was around 43.92±9.51 years old and 52.50±8.34 years old for male and female patients, respectively. Most of the patients met with diagnosis of schizophrenia (n=13), and the remaining met with diagnosis of mental retardation (n=1), schizoaffevtive (n=1), bipolar disorder (n=2) and major depressive disorder (n=1) (Table 1).
Statistical analysis:
Analysis of dependent variables had been accomplished by ‘t-test’ and appraisal of independent variables had been explored by means of ‘comparison of proportions’. Statistical significance, as well, had been defined as a p value ≤0.05. MedCalc Statistical Software version 15.2 was used as statistical software tool for analysis.
As said by results, among 20118 psychiatric patients hospitalized in razi psychiatric hospital, during the last sixty-four months (April of 2014-August 2019), eighteen patients had been diagnosed as hyponatremic, whether symptomatic or asymptomatic, during their inpatient treatment, based on laboratory checkups. So, the annual incidence of hyponatremia in the current inpatients’ evaluation was around 0.01%. In spite of referral to intensive care unit and given medical treatment, one elderly chronic female patient died by reason of hyponatremia. Accordingly, in the present survey the annual incidence of mortality because of hyponatremia was around 0.001%. Also, with regard to gender difference and in keeping with results, while there was no significant difference regarding age between male and female patients (t = 1.962, p< 0 xss=removed z=2.66, z=1.33, xss=removed total=122.64±5.06 xss=removed>
Many psychiatric patients have polydipsia and polyuria without identifiable underlying medical causes. Hyponatremia develops in some polydipsic patients and can progress to water intoxication with such symptoms as confusion, lethargy, psychosis, and seizures or death [16]. This syndrome is sometimes called "compulsive water drinking," "psychogenic polydipsia," and "self-induced water intoxication." Although the underlying pathophysiology of the syndrome is unclear, several factors have been implicated in producing polydipsia and symptomatic hyponatremia. These include a possible hypothalamic defect, the syndrome of inappropriate secretion of ADH (SIADH), and neuroleptic medication. Evaluation of psychiatric patients with polydipsia includes a search for other medical causes of polydipsia, polyuria, hyponatremia, and SIADH. Treatment modalities currently available include fluid restriction and medications [16]. Polydipsia, chronic or intermittent, with or without hyponatremia, frequently occurs among chronic patients with schizophrenia. The pathogenesis of polydipsia remains poorly understood. It has been suggested that maybe in some of these patients, polydipsia and hyponatremia are consequences of patients' adjustment to a prolonged intake of an insufficient diet, dominantly poor in potassium. Deficits of potassium, without significant hypokalemia, may cause impairment of the urine-concentrating ability with polyuria-polydipsia. A fall of intracellular tonicity, dominantly due to a decreased amount of K (+) and attendant anions in cells, should be accompanied with a fall of extracellular osmolality. Because of the diminished content of ions that may diffuse out of cells and because osmotic equilibrium between the extracellular fluid and intracellular fluid compartments cannot be established in a short period of time, these patients have a diminished ability to adapt to an excessive intake of fluids. These mechanisms might be related to the development of polydipsia and water intoxication in patients with different mental and somatic disorders [17]. On the other hand, while mild chronic hyponatremia, as defined by a persistent (>72 hours) plasma sodium concentration between 125 and 135 mEq/L without apparent symptoms, is common in ambulatory patients and generally perceived as being inconsequential [18], hyponatremia at time of inpatient admission is associated with increased severity of illness and mortality in patients hospitalized for treatment of medical conditions and should trigger enhanced clinical monitoring to identify and treat somatic disorders [19]. Drug-Induced hyponatremia is a frequent and potentially serious adverse reaction with many psychopharmacological agents, mediated in most cases by SIADH. This condition most often leads to subtle psychomotor symptoms due to its slow progression, permitting a compensatory adjustment of intra-cellular volume in the central nervous system. Subtle psychomotor symptoms and motor imbalance readily resolve after discontinuation of the responsible pharmacological agent [19]. In contrast, rapid onset of hyponatremia may present with life-threatening encephalopathy, which requires emergent infusion of intravenous hypertonic saline to reverse acute cerebral edema (20). Back to our discussion and along with analysis, while our estimate respecting prevalence of hyponatremia was lower than the approximations of Ohsawa et al. [9] Manu et al. [19], Sahay et al. [12], Meulendijks et al. [4] and Yang et al. [5], it was higher in comparison with the calculations of Letmaier et al. [6]. These variances can be due to diverse variables and confounding factors, like the principal of analysis, sample selection and settings of study. On the other hand, in spite of its acknowledgement as a known risk factor, a deficiency of epidemiological studies regarding hyponatremia is palpable, which is not limited to prevalence and incidence, too. Regarding the risk of mortality as a result of hyponatremia, our outcome, though limited to only one elderly and chronic female schizophrenic patient, was, more or less, in harmony with the conclusions of Naticchia et al. [1], Rondon-Berrios et al. [18]] and Siegel [2], who had indicated that, even mild reductions in sodium blood levels have been shown to be associated with increased mortality and hyponatremia should be regarded as a prevalent and potentially dangerous medical comorbidity in psychiatric patients. Moreover, consistent with the outcome of the present evaluation, male gender could be regarded as a risk factor for occurrence of hyponatremis, at least among psychiatric patients. Concerning chronicity of psychiatric disorders, conclusion of the current appraisal was in accord with the suppositions of Ohsawa et al. [9] and Gandhi et al. [11], who had found a long duration of psychiatric disorder and a prolonged admission as statistically significant factors in occurrence of hyponatremia, though the later had specified that due to atypical antipsychotic medications among older patients. Moreover, with regard to higher prevalence of hyponatremia among schizophrenic patients, our conclusion was again in harmony with the findings of Ohsawa et al. [9], Lapierre et al. [7] and Siegel [2], who had found the aforesaid medical complication more among that disorders. Furthermore, regarding clinical profile of hyponatremia, our outcome, which had revealed that there was no significant difference, quantitatively, between symptomatic and asymptomatic hyponatremic cases, was in agreement with the report of Liu et al. [10], who stated that patients with hyponatremia may be asymptomatic or present with nausea, anorexia, muscle cramps, weakness, fatigue, confusion and disorientation. Besides, our result as regards the insignificant relationship between sodium levels and severity of clinical symptoms, like seizure, was somewhat in accord with the findings of Manu et al. [19], who had found medical deteriorations incidences in both hyponatremic and non-hyponatremic patients, although more among the first group. Anyhow, as the most common electrolyte abnormality in medical practice, recent evidence from meta-analyses indicates that hyponatremia is associated with increased morbidity and excess mortality, and psychiatric patients are at substantial risk for this adverse event, which may occur with many pharmacologic agents. Since SIADH is the most common underlying mechanism, accounting for over 80% of cases in psychiatric patients, in contrast to less than 30% in general medical practice, clinicians prescribing pharmacological agents conferring risk for dilutional hyponatremia should maintain a high index of suspicion for the full spectrum of consequent clinical severity [20]. Restricted period of study, due to inadequate registration and documents in the last decades, and thus insufficient number of cases with idiopathic hyponatremia, and no concurrent checking of osmolality of serum and urine for proper classification of hyponatremia into water intoxication and drug‐induced syndrome of inappropriate antidiuretic hormone, do not permit generalization of outcomes to more than a preliminary survey. No doubt, further methodical studies in future will improve our clinical idea concerning diagnosis and management of this important medical problem among psychiatric patients.
Hyponatremia was significantly more prevalent among male patients and cases with duration of illness in excess of one year. Furthermore it was meaningfully more evident among schizophrenic patients.
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