|LETTER TO THE EDITOR
|Year : 2021 | Volume
| Issue : 4 | Page : 212-213
Symptomatic hypothyroidism manifesting psychotic relapse in a patient with schizophrenia: A case report
Yu- Yu Ko, Yu- Hsia Kao, Chia- Jung Lin, Huei- Yi Chang, Chuan- Hsun Yu
Department of General Psychiatry, Yuli Hospital, Ministry of Health and Welfare, Hualien, Taiwan
|Date of Submission||30-May-2021|
|Date of Decision||08-Jul-2021|
|Date of Acceptance||10-Jul-2021|
|Date of Web Publication||21-Dec-2021|
M.D Chuan- Hsun Yu
No. 448, Chung-Hwa Road, Yuli Township, Hualien County 981
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Ko YY, Kao YH, Lin CJ, Chang HY, Yu CH. Symptomatic hypothyroidism manifesting psychotic relapse in a patient with schizophrenia: A case report. Taiwan J Psychiatry 2021;35:212-3
|How to cite this URL:|
Ko YY, Kao YH, Lin CJ, Chang HY, Yu CH. Symptomatic hypothyroidism manifesting psychotic relapse in a patient with schizophrenia: A case report. Taiwan J Psychiatry [serial online] 2021 [cited 2022 Aug 12];35:212-3. Available from: http://www.e-tjp.org/text.asp?2021/35/4/212/332971
Hypothyroidism, a common endocrine disease, has been reported to have neuropsychiatric symptoms. The term “myxedema madness” was first introduced in 1949 by Asher for the relationship between hypothyroidism and psychosis . The serum level of thyroid hormones influences on psychiatric manifestation and response to treatment strategies . But hypothyroidism-related mental dysregulation can be masked by coexisting psychotic illness. Here, we are presenting a case of patient with schizophrenia, whose symptoms of hypothyroidism were mimicking those seen in a patient with psychotic relapse.
| Case Report|| |
Ms. A, a 64-year-old divorced female patient, has been diagnosed as schizophrenia for more than 46 years. She was admitted to a psychiatric chronic ward two years ago, due to her suffering from chronic psychosis. After risperidone treatment of 4 mg per day, her condition was stabilized despite of having residual auditory hallucinations and persecutory delusion. She had a medical history of chronic renal disease and an operation history of total thyroidectomy 10 years previously with a postoperative regular thyroxin sodium supplement.
During this hospitalization, the attending psychiatrist discontinued her thyroxin supplement due to normalized thyroid profile, (serum thyroid stimulating hormone [TSH] = 1.63 μU/mL, free T4 = 0.91 ng/dL, and T3 = 0.35 ng/mL). One week later, her stream of thought became more loosening and circumstantial. She also had worsened persecutory delusion and irritability with subjective dysphoria. Her psychosis was aggravated at first. Facial puffiness and mild hand tremor were observed thereafter. The thyroid profile showed serum TSH = 25.03 μU/mL, free T4 = 0.22 ng/dL and T3 = 0.22 ng/mL, indicating overt hypothyroidism. Psychotic relapse due to hypothyroidism was strongly suggested after a thorough physical examination and laboratory confirmation.
Consequently, the patient resumed thyroxin with her previous dose of 75 μg/day and her neuropsychiatric symptoms were subsided soon after. No antipsychotic treatment dose had been changed throughout relapse and medication compliance was ensured under the supervision of medical staff. [Figure 1] shows the association between her serum thyroid hormone and rated scales of psychotic symptoms. Psychotic symptoms and mood status were measured using a brief psychiatric rating scale and brief symptom rating scale-5.
|Figure 1: The correlation between thyroid stimulating hormone and BPRS, BSRS-5. thyroid stimulating hormone Unit is μU/mL. thyroid stimulating hormone, thyroid stimulating hormone; BPRS, brief psychiatric rating scale; BSRS-5, brief symptom rating scale.|
Click here to view
| Comments|| |
This case report described an overt hypothyroidism-related psychotic exacerbation in a patient with chronic schizophrenia. Neuropsychiatric symptoms caused by general medical conditions may be similar to patients' original psychotic presentations. According to her thyroid profile, our patient was defined as primary and overt hypothyroidism.
The prevalence of overt hypothyroidism is between 0.3% and 5.3%, depending on the study population and definition . In a population study, the investigators found that the schizophrenia group has a higher proportion of patients with hypothyroidism than the control group (2.01% vs. 1.25%) . Antipsychotic drugs have been speculated for the abnormal serum thyroid hormone levels. In recent retrospective study, the investigators showed that the rate of hypothyroidism is higher in patients with schizophrenia patients under antipsychotic treatment . In addition, the interaction between the hypothalamic–pituitary–thyroid axis and multiple neurotransmitters (involving dopaminergic, serotonergic, glutamatergic, and GABAergic) systems is also implicated in abnormal serum thyroid profile in schizophrenia . We suggest that the importance of thyroid function in patients with schizophrenia should not be neglected.
The clinical symptoms of overt hypothyroidism mimic those of depression, such as fewer weight loss, more appetite changes, and sleep disturbances . Without any specific psychotic characteristics in patients with hypothyroidism, paranoid symptoms, hallucinations, perseveration, and loose of associations are commonly seen ,. Although no clear diagnosing consensus of “myxoedema madness” exists, psychiatric symptoms occur earlier and more prominent in patients with hypothyroidism compared to physical symptoms ,.
The most common physical symptoms in patients with hypothyroidism are fatigue, cold intolerance, and dry skin . Neurological symptoms include paraesthesia, delayed relaxation of tendon reflex, and ataxia . Since hypothyroidism involves in nearly all major organs , review of system should be done carefully. While the severity of psychotic symptoms may be unrelated to the degree of thyroid hormone deficit , laboratorial finding of primary hypothyroidism should demonstrate an abnormal thyroid profile ,. Imaging studies such as electroencephalography, positron emission tomography and single-photon emission computed tomography can give further clinical hints .
Regarding the treatment of primary hypothyroidism, oral levothyroxine 1.5–1.8 μg per kg of bodyweight is recommended. The effect of combination of T4/T3 therapy for patients with hypothyroidism is still controversial . Once thyroid hormone profile has been stabilized after 4–12 weeks, repeated measurement should be scheduled every six months or annually . Previous studies suggested that early recognition of thyroid deficiency is essential, and delay in effective treatment can cause irreversible metabolic change even having prolonged psychotic symptoms .
In summary, this is a case of a patient with symptomatic hypothyroidism, manifesting psychotic relapse in schizophrenia. Psychotic symptoms were subsided after early recognition and effective thyroxin supplement. Based on the findings of this case report and information from published papers, we suggest that physical examination, laboratory analyses, systemic review, and medical history are important in evaluating patients with psychotic or mood symptoms and should not be overlooked. (The institutional review board of Yuli Hospital approved the publication of this case report (IRB protocol number = YLH-IRB-10193 and date of approval = November 2, 2010) with the stipulation of obtaining a signed informed consent from the patient.)
| Financial Support and Sponsorship|| |
| Conflicts of Interest|| |
The authors declare no conflicts of interest in writing this case report.
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