scholarly journals Overt Hypothyroidism Induced by Prolonged Therapy With Imatinib

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. A945-A946
Author(s):  
Ally W Wang ◽  
Emily V Nosova

Abstract Background: Imatinib, a tyrosine kinase inhibitor (TKI), is commonly used to treat chronic myelogenous leukemia (CML) and gastrointestinal stromal tumors. TKI-induced thyroid dysfunction is recognized as an adverse class effect with most cases occurring between six to twelve months after treatment initiation. Clinical Case: 76-year-old man with hypertension and CML on Imatinib that had been started twenty months prior was admitted for confusion. The patient also reported constipation, cold intolerance, and weight gain despite no change in diet, appetite, or physical activity. On evaluation, his responses to questioning were noticeably delayed, however he was not lethargic. His vital signs were normal and he was otherwise euthyroid on physical exam. He had no known history of thyroid dysfunction. Labs showed a TSH of 94.7 (0.4 - 4.2 uIU/mL), Free T4 0.4 (0.8 - 1.5 ng/dL), and Total T3 30 (87 - 178 ng/dL). Thyroglobulin antibody was 1016 (0.0 - 4.1 U/mL) and TPO antibody was >2000 (0.0 - 5.6 IU/mL). A TSH checked two months before admission was 1.1. Antibody levels had not been checked previously. Thyroid ultrasound demonstrated a hyperemic and heterogeneous thyroid, consistent with thyroiditis. Levothyroxine at a dose of 50 mcg daily was advised, due to patient’s advanced age as well as history of arrhythmia. The patient’s confusion resolved on hospital day three. Repeat thyroid function tests will be checked four to six weeks after Levothyroxine initiation. Discussion: As a class, tyrosine kinase inhibitors are known to cause thyroid dysfunction with the most common medication being Sunitinib. Data related to the effects of thyroid function during Imatinib treatment are limited. Previous cases of Imatinib-induced thyroid dysfunction report only hypothyroidism in thyroidectomized patients and no clinically significant change in thyroid function among patients who were euthyroid prior to therapy initiation. Our case reports a patient with no prior thyroidectomy who developed overt hypothyroidism while on Imatinib for nearly two years. The mechanism for TKI-induced thyroid dysfunction has not been elucidated. Due to relatively acute onset and markedly positive TPO and thyroglobulin antibodies, we suspect that TKI may alter HLA recognition on thyroid follicular cells, thereby inducing autoimmunity. Our case showcases the need to maintain awareness and continuous surveillance for thyroid dysfunction when patients are on long term TKI as overt hypothyroidism may be induced by prolonged treatment.

Author(s):  
Puja Banik ◽  
R. K. Praneshwari Devi ◽  
Aheibam Bidya ◽  
Akoijam Tamphasana ◽  
M. Agalya ◽  
...  

Background: Changes in thyroid function in normal pregnancy are well-documented but in complicated pregnancy like preeclampsia, very little is known. Studies have shown evidences of hypothyroidism in preeclampsia necessitating thyroid function tests to be done in preeclampsia. The study was done to analyze the fetomaternal outcome of preeclampsia with coexisting thyroid dysfunction.Methods: A cross-sectional analytical study was done over 18 months on 95 preeclamptic patients admitted at the antenatal ward and fetomaternal outcomes were analyzed according to thyroid status.Results: Out of 95 patients with preeclampsia, 42 (44.2%) had thyroid dysfunction. Among these 42 patients, 37 (38.9%) patients had subclinical hypothyroidism, 4 (4.2%) had overt hypothyroidism and 1 (1%) had hyperthyroidism. Severe preeclampsia was seen in 64.3% of the patients with thyroid dysfunction compared with 39.6% in euthyroid patients. The mean thyroid stimulating hormone (TSH) level was significantly higher and means free thyroxine (fT4) level was significantly lower in severe preeclampsia compared with non-severe preeclampsia. Complications like abruption, intrauterine fetal death (IUD), intrauterine growth restriction (IUGR), oligohydramnios, preterm deliveries, postpartum hemorrhage (PPH), low birth weight babies, birth asphyxia in babies and subsequent neonatal intensive care unit (NICU) admissions were significantly higher (p <0.05) in the preeclampsia patients with thyroid dysfunction in comparison with euthyroid ones.Conclusions: Hypothyroidism may be a modifiable risk factor for preeclampsia. Thyroid screening early in pregnancy may be helpful in predicting the occurrence of preeclampsia and timely thyroid hormone administration can reduce the maternal and perinatal morbidity and mortality associated with preeclampsia.


2009 ◽  
Vol 24 (S1) ◽  
pp. 1-1
Author(s):  
V. Kontaxakis ◽  
D. Karaiskos ◽  
B. Havaki-Kontaxaki ◽  
D. Skourides ◽  
P. Ferentinos ◽  
...  

Objective:Quetiapine induced hypothyroidism is a rare side effect requiring either drug discontinuation or initiation of thyroid replacement therapy. We highlight the potential reversibility of quetiapine induced hypothyroidism in two such cases.Methods:Two case reports.Results:Case 1.Quetiapine (200mg/day) was initiated to a psychotic female patient due to exaggeration of positive symptomatology. Although her thyroid function tests (TFTs) upon admission were normal after a month significant decreases in T3 and T4 level and an elevation in TSH was observed. 45 days later the TFT returned to normal, although she remained on quetiapine. Case 2. Quetiapine (300mg/daily) was prescribed to a bipolar male patient due to a mixed affective episode with a very good response. Despite his normal admission TFTs, three weeks later a decrease in total T4 and a marked increase in TSH was observed .45 days later, although no measures were taken, TFTs returned within reference range.Conclusions:These are the first cases reporting reversibility of quetiapine induced hypothyroidism. TFTs alterations are dose related, relatively slight and linked to a positive history of thyroid abnormality. Our patients did not fulfil any of these criteria. Besides, hypothyroidism resolved although the antipsychotic therapy was continued and no thyroid replacement therapy was given. We suggest a careful thyroid monitoring for patients initiating quetiapine. However, physicians should wait in cases of thyroid dysfunction, since thyroid dysregulation may soon be resolved.


2020 ◽  
Vol 105 (8) ◽  
pp. 2667-2677 ◽  
Author(s):  
Rima K Dhillon-Smith ◽  
Aurelio Tobias ◽  
Paul P Smith ◽  
Lee J Middleton ◽  
Kirandeep K Sunner ◽  
...  

Abstract Objective To describe the prevalence of and factors associated with different thyroid dysfunction phenotypes in women who are asymptomatic preconception. Design Observational cohort study. Setting A total of 49 hospitals across the United Kingdom between 2011 and 2016. Participants Women aged 16 to 41years with history of miscarriage or subfertility trying for a pregnancy. Methods Prevalences and 95% confidence intervals (CIs) were estimated using the binomial exact method. Multivariate logistic regression analyses were conducted to identify risk factors for thyroid disease. Intervention None. Main Outcome Measure Rates of thyroid dysfunction. Results Thyroid function and thyroid peroxidase antibody (TPOAb) data were available for 19213 and 19237 women, respectively. The prevalence of abnormal thyroid function was 4.8% (95% CI, 4.5-5.1); euthyroidism was defined as levels of thyroid-stimulating hormone (TSH) of 0.44 to 4.50 mIU/L and free thyroxine (fT4) of 10 to 21 pmol/L. Overt hypothyroidism (TSH &gt; 4.50 mIU/L, fT4 &lt; 10 pmol/L) was present in 0.2% of women (95% CI, 0.1-0.3) and overt hyperthyroidism (TSH &lt; 0.44 mIU/L, fT4 &gt; 21 pmol/L) was present in 0.3% (95% CI, 0.2-0.3). The prevalence of subclinical hypothyroidism (SCH) using an upper TSH concentration of 4.50 mIU/L was 2.4% (95% CI, 2.1-2.6). Lowering the upper TSH to 2.50 mIU/L resulted in higher rates of SCH, 19.9% (95% CI, 19.3-20.5). Multiple regression analyses showed increased odds of SCH (TSH &gt; 4.50 mIU/L) with body mass index (BMI) ≥ 35.0 kg/m2 (adjusted odds ratio [aOR] 1.71; 95% CI, 1.13-2.57; P = 0.01) and Asian ethnicity (aOR 1.76; 95% CI, 1.31-2.37; P &lt; 0.001), and increased odds of SCH (TSH ≥ 2.50 mIU/L) with subfertility (aOR 1.16; 95% CI, 1.04-1.29; P = 0.008). TPOAb positivity was prevalent in 9.5% of women (95% CI, 9.1-9.9). Conclusions The prevalence of undiagnosed overt thyroid disease is low. SCH and TPOAb are common, particularly in women with higher BMI or of Asian ethnicity. A TSH cutoff of 2.50 mIU/L to define SCH results in a significant proportion of women potentially requiring levothyroxine treatment.


2020 ◽  
pp. 1-3
Author(s):  
Nilanjana Debnath ◽  
Keshao B. Nagpure ◽  
Preetam N. Wasnik

Context: Cognitive impairment is linked to thyroid dysfunction in various studies; however, the evidence is mixed. Aims: To determine cognitive function in the working population with abnormal thyroid function tests. Settings: Outpatient department of Medicine in a tertiary care hospital located in Central India. Design: Hospital-based, cross-sectional study. Methods and Material:100 patients between 15-64 years of age with different patterns of thyroid dysfunction were subjected to cognitive function testing via the Mini-Mental Status Examination (MMSE) questionnaire. Statistical analysis used: The data obtained was coded in a Microsoft Excel Worksheet and analyzed by SPSS software version 21. Results: 100 patients (11 % men and 89 % women) were included in the present study. The mean age of the study population was 37.11±8.76 years. 87 % had overt hypothyroidism, 6 % had subclinical hypothyroidism, 6 % had overt hyperthyroidism. The mean MMSE score of patients with abnormal thyroid function tests was 27.62 ±2.04 (Range 23-30). The mean MMSE score in patients with overt hypothyroidism was 27.54 ± 2.07, that of overt hyperthyroidism 28.33 ±1.03, and that of subclinical hypothyroidism was 27.67 ± 2.50. MMSE scores among different patterns of thyroid dysfunction were not found to be statistically significant. The MMSE scores between newly and previously diagnosed patients with thyroid dysfunction were not statistically significant. (28.3 ± 1.06 vs 27.54 ± 2.12). Conclusions: The results suggest no association between cognitive function and abnormal thyroid function tests in the working population.


2018 ◽  
Vol 68 (675) ◽  
pp. e718-e726 ◽  
Author(s):  
Lesley Roberts ◽  
Deborah McCahon ◽  
Oliver Johnson ◽  
M Sayeed Haque ◽  
James Parle ◽  
...  

BackgroundThyroid function tests (TFTs) are among the most requested tests internationally. However, testing practice is inconsistent, and potentially suboptimal and overly costly. The natural history of thyroid function remains poorly understood.AimTo establish the stability of thyroid function over time, and identify predictors of development of overt thyroid dysfunction.Design and settingLongitudinal follow-up in 19 general practices in the UK.MethodA total of 2936 participants from the Birmingham Elderly Thyroid Study (BETS 1) with a baseline TFT result indicating euthyroid or subclinical state were re-tested after approximately 5 years. Change in thyroid-stimulating hormone (TSH), free thyroxine (FT4), and thyroid status between baseline and follow-up was determined. Predictors of progression to overt dysfunction were modelled.ResultsParticipants contributed 12 919 person-years; 17 cases of overt thyroid dysfunction were identified, 13 having been classified at baseline as euthyroid and four as having subclinical thyroid dysfunction. Individuals with subclinical results at baseline were 10- and 16-fold more likely to develop overt hypothyroidism and hyperthyroidism, respectively, compared with euthyroid individuals. TSH and FT4 demonstrated significant stability over time, with 61% of participants having a repeat TSH concentration within 0.5 mIU/L of their original result. Predictors of overt hypothyroidism included new treatment with amiodarone (odds ratio [OR] 92.1), a new diagnosis of atrial fibrillation (OR 7.4), or renal disease (OR 4.8).ConclusionHigh stability of thyroid function demonstrated over the 5-year interval period should discourage repeat testing, especially when a euthyroid result is in the recent clinical record. Reduced repeat TFTs in older individuals is possible without conferring risk, and could result in significant cost savings.


2020 ◽  
Vol 4 (Supplement_1) ◽  
Author(s):  
Heather Fishel

Abstract Background: Pembrolizumab (PD-1) is an immune checkpoint inhibitor used for treating melanoma and has been associated endocrine immune-related adverse events. Case Presentation: 76-year-old Caucasian male presented for evaluation of abnormal thyroid labs. Significant co-morbidities included recurrent melanoma, heart failure, atrial fibrillation, coronary artery disease, type 2 diabetes, hypertension. Patient’s melanoma was being treated with Pembrolizumab. Further history revealed no family/personal history of thyroid disease but a history of mouth cancer treated with radiation over 30 years ago. He denied any recent glucocorticoid or biotin use. Symptoms included worsening fatigue, weight loss, and diarrhea. He was afebrile and vitally stable. Physical exam was unremarkable. Prior to this year, patient had normal thyroid labs. Recent thyroid labs showed TSH of 0.01 uIU/mL (normal 0.34-4.94 uIU/mL), confirmed with repeat labs a week later (TSH: &lt; 0.01, Free T4: 2.23 ng/dL, normal Free T4: 0.7-1.48 ng/dL). There was a high suspicion that these labs were related to Pembrolizumab, but other etiologies were evaluated. Completed thyroid uptake and scan showed no evidence of increased activity (4-hour uptake: 1.6%, 24-hour update: 1.2%). Repeat thyroid labs indicated recovering thyroid function with a TSH: 0.14 uIU/mL, Free T4: 0.49 ng/dL, Free T3: 1.5 pg/mL (normal Free T3 2.3-4.2 pg/mL), TSI: 96% (normal &lt; 140%), TPO Ab: 111 IU/mL (normal TPO Ab &lt; 9 IU/mL). One month later thyroid tests resulted as TSH: 72.81 uIU/mL, Free T4: &lt; 0.40. He was started on levothyroxine, which was titrated over several weeks. Discussion: Pembrolizumab (PD-1) is an IgG4 programmed cell death 1-directed monoclonal antibody, whose mechanism of action is to inhibit cancer cells ability impede T-cell activation. However, because of this mechanism, some T-cells, will remain activated, leading to autoimmune diseases. PD-1 has been associated with thyroid dysfunction, with an incidence rate as high as 14-20%. The clinical presentation varies from isolated thyrotoxicosis to overt hypothyroidism. In our patient, he developed thyrotoxicosis with subsequent development of hypothyroidism. Generally, the timing of thyroid dysfunction after the initiation of PD-1 ranges from 3 to 40 weeks, with the median onset at week 6. Baseline TSH and free T4 should be obtained with rechecking of these labs monthly for the first 6 months. For patients who present with thyrotoxicosis, Grave’s disease should be ruled out, and initial treatment should include beta-blockers. Hypothyroidism should be treated with levothyroxine with titration to normal thyroid function tests. What remains to be determined is the mechanism in which PD-1 causes thyroid dysfunction and if specific patient characteristics, such as thyroid antibodies, can be used to risk stratify the likelihood of a patient developing thyroid dysfunction.


Author(s):  
Mir Waseem ◽  
Tabinda Shah ◽  
Mir Nadeem ◽  
Jaspreet Singh ◽  
Saba Maqbool ◽  
...  

Background: Rheumatoid arthritis (RA) is a chronic autoimmune systemic inflammatory multisystem disease of unknown cause that may affect many tissues and organs, but principally attacks synovial joints, primarily affecting the peripheral joints in a symmetrical pattern. The pathology of the disease process often leads to destruction of articular cartilage. It is the commonest inflammatory arthropathy worldwide with a gender predilection towards women. Prevalence of RA in the adult general population is approximately 1%. An association between RA and thyroid dysfunction with or without autoimmune origin has been reported in 6% to 34% of patients with RA. On the contrary, when presence of thyroid antibodies is considered, despite normal thyroid function, the prevalence can rise up to about 38%. These rates are significantly greater when compared with the general population.Methods: RA patients who were diagnosed according to the new 2010 EULAR/ACR criteria and thyroid function tests were done and patients with thyroid dysfunction were identified and then patients were divided into two groups based on presence of thyroid dysfunction with rheumatoid arthritis and disease activity was illustrated in both groups based on different scales.Results: In all, 250 patients 215 (86.8%) were females and 33 (13.2%) were males. ESR was elevated in 85 (34%) patients while as it was normal in 165(66%) patients. CRP was positive in 127 (52.7%) negative in 123 (47.3%) patients. Although subclinical hypothyroidism was the most frequent abnormality observed in 38.3% patients, only 30% had concomitant anti-TPO raised and 71.4% patients of overt hypothyroidism had raised anti-TPO antibody. Disease activity parameters were significantly higher in patients of RA with hypothyroidism as compared to other group. Although most of parameters of disease activity showed a higher frequency in the group having patients with thyroid disorder but the swollen joint count was comparable in both the groups and was not statistically significant.Conclusions: Presence of thyroid disorders in RA patients is suggestive of a more aggressive disease. To diagnose concurrent thyroid disorders at an earlier stage, routine measurement of serum thyroid- stimulating hormone is recommended in all RA patients at the time of diagnosis and with yearly interval thereafter.


2016 ◽  
Vol 9 (3) ◽  
pp. 126-129 ◽  
Author(s):  
Helen Robinson ◽  
Philip Robinson ◽  
Michael D’Emden ◽  
Kassam Mahomed

Background First-trimester care of maternal thyroid dysfunction has previously been shown to be poor. This study evaluates early management of thyroid dysfunction in pregnancy in Australia. Methods Patients reviewed by the Obstetric Medicine team for thyroid dysfunction from 1 January 2012 to 30 June 2013 were included. Data were collected on gestation at referral from the patient’s general practitioner to the antenatal clinic, information provided in the referral letter, thyroid function tests and thyroid medications. Results Eighty-five women were included in the study. At the time of general practitioner referral to antenatal services, 19% of women with preexisting thyroid disease had no thyroid function tested. Forty-three percent had an abnormal thyroid-stimulating hormone defined as being outside the laboratory-specific pregnancy reference range if available, or outside the level of 0.1–2.5 mIu/L in the first trimester, 0.2–3.0 mIu/L in the second trimester and 0.3–3.0 mIu/L in the third trimester. Only 21% of women increased their thyroxine dose prior to their first antenatal clinic review. Conclusion This study highlights that a significant proportion of women with known thyroid disease either have untested thyroid function in the first trimester or a thyroid-stimulating hormone outside of levels recommended by guidelines.


2021 ◽  
pp. 73-76
Author(s):  
Vasudev Sankhla ◽  
Aman Deep

Thyroid function tests are one of the most common endocrine panels in general practice because a good understanding of when to order them, indications for treatment are important for the optimal treatment of thyroid dysfunction. Thyroid-stimulating hormone (TSH) should be the rst test to be performed on any patient with suspected thyroid dysfunction and in follow-up of individuals on treatment. It is useful as a rst-line test because even small changes in thyroid function are sufcient to cause a signicant increase in TSH secretion. Thyroxine levels may be assessed in a patient with hyperthyroidism, to determine the severity of hyperthyroxinemia. Antithyroid peroxidase measurements should be considered while evaluating patients with subclinical hypothyroidism and can facilitate the identication of autoimmune thyroiditis during the evaluation of nodular thyroid disease. The measurement of TSH receptor antibody must be considered when conrmation of Graves’ disease is needed and radioactive iodine uptake cannot be done.


Author(s):  
Ankita Kumari ◽  
Reena Srivastav ◽  
Shaila Mitra

Background: The aim of the study is to determine the prevalence of thyroid dysfunction in pregnancy and its impact on obstetrical outcome in Eastern Uttar Pradesh.Methods: This was a prospective observational study undertaken at antenatal clinics and indoor of BRD Medical College, Gorakhpur. Total 720 antenatal women, ≤20 weeks of gestation were recruited for the study. In all patients’ routine obstetrical investigations and thyroid function tests were done. All patients were followed up to delivery. Maternal and perinatal outcome were ascertained.Results: Prevalence of thyroid dysfunction among pregnant was found to be 21.1% and subclinical hypothyroidism (15.9%) was the commonest thyroid disorder. Most common complication observed in subclinical and overt hypothyroidism was preeclampsia (9.56 % versus 20%) followed by preterm labour (7.82% versus 10%). Major fetal complications in hypothyroid mothers included intrauterine growth restriction, low birth weight and stillbirth.Conclusions: Prevalence of hypothyroidism was found to be high in our study and was associated with adverse pregnancy outcomes; hence, thyroid screening should be included in routine antenatal investigations.


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