Discontinuation of Low-Dose Levothyroxine in Older Adults With Subclinical Hypothyroidism
Discontinuation of Low Dose Levothyroxine Therapy for Older Adults With Subclinical Hypothyroidism: a Randomized, Double-blinded, Placebo-controlled Study
The goal of this clinical trial is to learn whether low-dose levothyroxine can be safely discontinued in adults aged 65 years or older who are taking levothyroxine for subclinical hypothyroidism. The study will also evaluate the cost-effectiveness of discontinuing levothyroxine.
The main questions it aims to answer are:
- Does discontinuing levothyroxine result in no clinically meaningful worsening of thyroid-related symptoms compared with continuing levothyroxine?
- What are the effects of discontinuing levothyroxine on quality of life, tiredness, cognition, thyroid hormone levels, lipid levels, weight, and adverse events?
- Is discontinuing levothyroxine cost-effective compared with continuing treatment?
Researchers will compare participants who discontinue levothyroxine and receive placebo with participants who continue their current dose of levothyroxine to determine the effects of levothyroxine discontinuation.
Participants will:
- Complete a 2-week run-in period during which they continue their usual levothyroxine and record their medication use.
- Eligible participants will be randomly assigned to either continue their current dose of levothyroxine or receive a matching placebo for 6 months. Participants, their clinicians, and study investigators will not know which treatment they are receiving during the study.
- Complete study assessments at baseline, approximately 2 months, and 6 months. Assessments will include blood tests, measurements such as body weight, questionnaires about thyroid-related symptoms and quality of life, and assessments of cognition and other health outcomes.
Visão geral do estudo
Status
Status
Condições
Condições
Intervenção / Tratamento
Intervenção / Tratamento
Tipo de estudo
Tipo de estudo
Inscrição (Estimado)
Inscrição
Estágio
Estágio
- Fase 4
Contactos e Locais
Contato de estudo
Contato de estudo
- Nome: Spyridoula Maraka, M.D., M.S.
- Número de telefone: (501) 257-5848
- E-mail: spyridoula.maraka@va.gov
Estude backup de contato
- Nome: Katherine Dishongh
- Número de telefone: (501) 507-9554
- E-mail: katherine.dishongh@va.gov
Locais de estudo
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Arkansas
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Little Rock, Arkansas, Estados Unidos, 72205
- Central Arkansas Veterans Healthcare System
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Contato:
- Spyridoula Maraka, M.D., M.S.
- Número de telefone: (501) 257-5848
- E-mail: spyridoula.maraka@va.gov
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Contato:
- Katherine Dishongh
- Número de telefone: (501) 507-9554
- E-mail: katherine.dishongh@va.gov
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Investigador principal:
- Spyridoula Maraka, M.D., M.S.
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Florida
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Gainesville, Florida, Estados Unidos, 32610
- University of Florida Clinical Research Center
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Contato:
- Naykky Singh Ospina, M.D., M.S.
- Número de telefone: (352) 273-8655
- E-mail: naykky.singhospina@medicine.ufl.edu
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Investigador principal:
- Naykky Singh Ospina, M.D., M.S.
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Minnesota
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Rochester, Minnesota, Estados Unidos, 55905
- Mayo Clinic
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Contato:
- Juan Pablo Brito Campana, M.B.B.S.
- Número de telefone: (507) 266-0500
- E-mail: brito.juan@mayo.edu
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Investigador principal:
- Juan Pablo Brito Campana, M.B.B.S.
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Critérios de participação
Critérios de elegibilidade
Critérios de elegibilidade
Idades elegíveis para estudo
- Adulto mais velho
Aceita Voluntários Saudáveis
Descrição
Inclusion Criteria:
- Age ≥65 years.
- Euthyroid at the time of enrollment, defined as thyroid-stimulating hormone (TSH) and free thyroxine (fT4) levels within the reference range.
- Receiving levothyroxine treatment for subclinical hypothyroidism for at least 6 months.
- Receiving levothyroxine at a dose ≤50 mcg/day, or ≤25 mcg/day for participants weighing <50 kg.
- Receiving outpatient care at the participating study site for at least 12 months.
Subclinical hypothyroidism is defined as a TSH level above the normal reference range but <10 mIU/L, with a normal fT4 level, prior to initiation of levothyroxine therapy.
Exclusion Criteria:
- TSH >10 mIU/L at any time documented in the institutional electronic health record.
- Levothyroxine therapy initiated less than 6 months before enrollment.
- Abnormal thyroid function at the time of enrollment.
- Current use of medications that affect thyroid hormone levels, such as antithyroid medications, amiodarone, or lithium.
- History of thyroid cancer or goiter with compressive symptoms.
- History of partial or total thyroidectomy or radioactive iodine therapy.
- New York Heart Association (NYHA) Class IV heart failure.
- Hospitalization for a major illness or elective surgery within the previous 4 weeks, including acute coronary syndrome, acute myocarditis, pancarditis, or stroke.
- Unstable medical condition that, in the investigator's judgment, would jeopardize participant safety or interfere with study participation.
- Terminal illness with a life expectancy of less than 6 months.
- Lack of decision-making capacity.
- Severe dyslipidemia, defined as LDL cholesterol >190 mg/dL.
- Untreated depression.
- Uncontrolled psychiatric disorder.
- Uncontrolled chronic fatigue syndrome.
- Uncontrolled pain.
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Finalidade Principal: Tratamento
- Alocação: Randomizado
- Modelo Intervencional: Atribuição Paralela
- Mascaramento: Triplo
Número de braços
Armas e Intervenções
Grupo de Participantes / BraçoGrupo de Participantes / Braço |
Intervenção / TratamentoIntervenção / Tratamento |
|---|---|
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Comparador Ativo: Levothyroxine Continuation
Participants will continue their pre-study dose of levothyroxine for 6 months using blinded study medication.
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Participants assigned to the levothyroxine continuation arm will continue levothyroxine at their pre-study dose (≤50 mcg/day) for 6 months.
Levothyroxine will be administered orally once daily as over-encapsulated study medication matched in appearance to placebo to maintain blinding.
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Experimental: Levothyroxine Discontinuation
Participants will discontinue levothyroxine and receive matching placebo for 6 months using blinded study medication.
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Participants assigned to the levothyroxine discontinuation arm will discontinue levothyroxine and receive matching placebo orally once daily for 6 months.
Placebo will be over-encapsulated and matched in appearance to the active study medication to maintain blinding.
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O que o estudo está medindo?
Medidas de resultados primários
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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Mean ThyPRO Hypothyroid Symptoms Scale Score at 6 Months
Prazo: 6 months
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Thyroid-related symptoms will be assessed using the 4-item Thyroid-specific Patient Reported Outcome (ThyPRO) Hypothyroid Symptoms Scale.
Scores are transformed to a 0-100 scale, with higher scores indicating more severe hypothyroid symptoms.
The mean 6-month score will be compared between the levothyroxine discontinuation (placebo) group and the levothyroxine continuation group.
The prespecified noninferiority margin is 9 points.
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6 months
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Medidas de resultados secundários
Medidas de resultados secundários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
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Mean ThyPRO Hypothyroid Symptoms Scale Score Over Time
Prazo: Baseline, 2 months, 6 months
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Mean score on the 4-item ThyPRO Hypothyroid Symptoms Score.
Scores range from 0 to 100, with higher scores indicating more severe hypothyroid symptoms.
Longitudinal changes will be evaluated between treatment groups.
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Baseline, 2 months, 6 months
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Mean ThyPRO Tiredness Scale Score
Prazo: Baseline, 2 month, and 6 months
|
Tiredness will be assessed using the 7-item ThyPRO Tiredness Scale.
Scores range from 0 to 100, with higher scores indicating greater tiredness.
Mean scores and longitudinal changes will be compared between treatment groups.
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Baseline, 2 month, and 6 months
|
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Mean Brief Fatigue Inventory Score
Prazo: Baseline, 2 months, and 6 months
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Fatigue will be assessed during the 9-item Brief Fatigue Inventory (BFI).
Items are scored from 0 to 10 and the mean item score will be calculated, with higher scores indicating greater fatigue severity or interference.
Mean scores and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Patient-Generated Index Visual Analogue Scale Score
Prazo: Baseline, 2 months, and 6 months
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Participant-identified symptoms considered important and related to subclinical hypothyroidism will be assessed using the Patient-Generated Index (PGI) visual analogue scale.
Scores range from 0-100, with higher scores indicating less severe symptoms.
Mean scores and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean ThyPRO-39 Quality-of-Life Score
Prazo: Baseline and 6 months
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Thyroid-specific quality of life will be assessed using the 39-item ThyPRO-39 questionnaire.
Scores range from 0 to 100, with higher scores indicating worse thyroid-related quality of life.
Mean scores will be compared between treatment groups.
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Baseline and 6 months
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Mean EQ-5D Descriptive Index Score
Prazo: Baseline, 2 months, and 6 months
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General health-related quality of life will be assessed using the EQ-5D descriptive index.
Scores range from -0.59 to 1.00, with higher scores indicating better health-related quality of life.
Mean scores and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean EQ Visual Analogue Scale Score
Prazo: Baseline, 2 months, and 6 months
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Self-rated health will be assessed using the EQ visual analogue scale (EQ VAS).
Scores range from 0 to 100, with higher scores indicating better self-rated health.
Mean scores and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Number of Participants Preferring Study Treatment Versus Pre-Study Treatment
Prazo: 2 months and 6 months
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Participants will report whether they prefer the treatment they are currently receiving during the study or their pre-study levothyroxine treatment.
The number and percentage of participants reporting each preference will be summarized by treatment group.
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2 months and 6 months
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Mean Modified Telephone Interview for Cognitive Status Score
Prazo: Baseline and 6 months
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Cognitive function will be assessed using the Modified Telephone Interview for Cognitive Status (TICS-M), a 13-item cognitive assessment evaluating orientation, concentration, memory, naming, calculation, comprehension, and reasoning.
Total scores range from 0 to 39, with higher scores indicating better cognitive performance.
Mean scores will be compared between treatment groups.
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Baseline and 6 months
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Mean Body Weight
Prazo: Baseline, 2 months, and 6 months
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Body weight will be measured in kilograms.
Mean body weight and change in body weight will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Thyroid-Stimulating Hormone Level
Prazo: Baseline, 2 months, and 6 months
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Serum thyroid-stimulating hormone (TSH) will be measured in mIU/L to assess thyroid function.
Mean TSH levels and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Free Thyroxine Level
Prazo: Baseline, 2 months, and 6 months
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Serum free thyroxine (free T4) will be measured in ng/dL to assess thyroid function.
Mean free T4 levels and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Total Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
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Serum total cholesterol will be measured in mg/dL.
Mean levels and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Low-Density Lipoprotein Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
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Serum low-density lipoprotein (LDL) cholesterol will be measured in mg/dL.
Mean levels and longitudinal changes will be compared between treatment groups.
|
Baseline, 2 months, and 6 months
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Mean High-Density Lipoprotein Cholesterol Level
Prazo: Baseline, 2 months, and 6 months
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Serum high-density lipoprotein (HDL) cholesterol will be measured in mg/dL.
Mean levels and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Mean Triglyceride Level
Prazo: Baseline, 2 months, and 6 months
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Serum triglycerides will be measured in mg/dL.
Mean levels and longitudinal changes will be compared between treatment groups.
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Baseline, 2 months, and 6 months
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Incidence of All-Cause Mortality
Prazo: From enrollment to the end of the study at 6 months
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Number and proportion of participants who die from any cause during study participation, assessed through medical record review and/or family report.
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From enrollment to the end of the study at 6 months
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Incidence of Cardiovascular Events
Prazo: From enrollment to the end of the study at 6 months
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Number and proportion of participants experiencing one or more cardiovascular events, including acute myocardial infarction, atrial fibrillation, stroke, acute coronary syndrome, or heart failure, assessed through medical record review and participant report.
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From enrollment to the end of the study at 6 months
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Incidence of Falls and Fractures
Prazo: From enrollment to the end of the study at 6 months
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Number and proportion of participants experiencing one or more falls or fractures, assessed through medical record review and participant report.
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From enrollment to the end of the study at 6 months
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Incidence of Overt Hypothyroidism
Prazo: 2 months and 6 months
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Number and proportion of participants who develop overt hypothyroidism based on protocol-defined thyroid hormone criteria.
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2 months and 6 months
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Incidence of Hyperthyroidism
Prazo: 2 months and 6 months
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Number and proportion of participants who develop hyperthyroidism based on protocol-defined thyroid hormone criteria.
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2 months and 6 months
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Proportion of Participants Maintaining Euthyroid Status After Levothyroxine Discontinuation
Prazo: 2 months and 6 months
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Among participants randomized to levothyroxine discontinuation/placebo, the number and proportion who remain euthyroid based on protocol-defined thyroid hormone criteria will be assessed.
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2 months and 6 months
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Number of Participants with Adverse Events
Prazo: From enrollment to 30 days after Month 6
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Number and proportion of participants experiencing one or more adverse events during study participation.
Adverse events will be assessed and classified according to the protocol-defined criteria for severity, expectedness, and relationship to study intervention.
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From enrollment to 30 days after Month 6
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Number of Participants with Serious Adverse Events
Prazo: From enrollment to 30 days after Month 6
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Number and proportion of participants experiencing one or more serious adverse events as defined in the study protocol.
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From enrollment to 30 days after Month 6
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Colaboradores e Investigadores
Patrocinador
Patrocinador
Investigadores
Investigadores
- Diretor de estudo: Spyridoula Maraka, M.D., M.S., Central Arkansas Veterans Healthcare System
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo (Estimado)
Início do estudo
Conclusão Primária (Estimado)
Conclusão Primária
Conclusão do estudo (Estimado)
Conclusão do estudo
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Real)
Primeira postagem
Atualizações de registro de estudo
Última Atualização Postada (Real)
Última Atualização Postada
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Última verificação
Mais Informações
Termos relacionados a este estudo
Palavras-chave
Termos MeSH relevantes adicionais
Outros números de identificação do estudo
Outros números de identificação do estudo
- LT4-DISCONTINUE-01
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