Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment
Background: For significant numbers of patients dissatisfied on standard levothyroxine (LT4) treatment for hypothyroidism, patient-specific responses to T4 could play a significant role.Aim: To assess response heterogeneity to LT4 treatment, identifying confounders and hidden clusters within a patie...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-09-01
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| Series: | Frontiers in Endocrinology |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fendo.2019.00664/full |
| _version_ | 1819062859929223168 |
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| author | Rudolf Hoermann John E. M. Midgley Rolf Larisch Johannes W. Dietrich Johannes W. Dietrich |
| author_facet | Rudolf Hoermann John E. M. Midgley Rolf Larisch Johannes W. Dietrich Johannes W. Dietrich |
| author_sort | Rudolf Hoermann |
| collection | DOAJ |
| description | Background: For significant numbers of patients dissatisfied on standard levothyroxine (LT4) treatment for hypothyroidism, patient-specific responses to T4 could play a significant role.Aim: To assess response heterogeneity to LT4 treatment, identifying confounders and hidden clusters within a patient panel, we performed a secondary analysis using data from a prospective cross-sectional and retrospective longitudinal study.Methods: Multivariate and multivariable linear models adjusted for covariates (gender, age, and BMI) were stratified by disease-specific treatment indication. During follow-up, pooled observations were compared from the same patient presenting either with or without self-reported symptoms. Statistical analysis was extended to multilevel models to derive intra-class correlation coefficients and reliability measures during follow-up.Results: Equilibria between TSH, FT4, and FT3 serum concentrations in 342 patients were examined by treatment indication (benign goiter, autoimmune thyroiditis, thyroid carcinoma), consequently displaying complex interactive response patterns. Seventy-seven patients treated with LT4 and monitored for thyroid carcinoma presented, in association with changes in LT4 dose, either with hypothyroid symptoms or symptom-free. Significant biochemical differences appeared between the different presentations. Leveled trajectories by subject to relief from hypothyroid symptoms differed significantly, indicating distinct responses, and denying a single shared outcome. These were formally defined by a high coefficient of the intraclass correlation (ICC1, exceeding 0.60 in all thyroid parameters) during follow-up on multiple visits at the same LT4 dose, when lacking symptoms. The intra-personal clusters were clearly differentiated from random variability by random group resampling. Symptomatic change in these patients was strongly associated with serum FT3, but not with FT4 or TSH concentrations. In 25 patients transitioning from asymptomatic to symptomatically hyperthyroid, FT3 concentrations remained within the reference limits, whilst at the same time marked biochemical differences were apparent between the presentations.Conclusions: Considerable intra-individual clustering occurred in the biochemical and symptomatic responses to LT4 treatment, implying statistically multileveled response groups. Unmasking individual differences in the averaged treatment response hereby highlights clinically distinguishable subgroups within an indiscriminate patient panel. This, through well-designed larger clinical trials will better target the different therapeutic needs of individual patients. |
| first_indexed | 2024-12-21T15:05:29Z |
| format | Article |
| id | doaj.art-36394b96139d41e0af703fab2bc8e1fd |
| institution | Directory Open Access Journal |
| issn | 1664-2392 |
| language | English |
| last_indexed | 2024-12-21T15:05:29Z |
| publishDate | 2019-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Endocrinology |
| spelling | doaj.art-36394b96139d41e0af703fab2bc8e1fd2022-12-21T18:59:26ZengFrontiers Media S.A.Frontiers in Endocrinology1664-23922019-09-011010.3389/fendo.2019.00664449017Functional and Symptomatic Individuality in the Response to Levothyroxine TreatmentRudolf Hoermann0John E. M. Midgley1Rolf Larisch2Johannes W. Dietrich3Johannes W. Dietrich4Department for Nuclear Medicine, Klinikum Lüdenscheid, Lüdenscheid, GermanyNorth Lakes Clinical, Ilkley, United KingdomDepartment for Nuclear Medicine, Klinikum Lüdenscheid, Lüdenscheid, GermanyMedical Department I, Endocrinology and Diabetology, Bergmannsheil University Hospitals, Ruhr University of Bochum, Bochum, GermanyRuhr Center for Rare Diseases (CeSER), Ruhr University of Bochum and Witten/Herdecke University, Bochum, GermanyBackground: For significant numbers of patients dissatisfied on standard levothyroxine (LT4) treatment for hypothyroidism, patient-specific responses to T4 could play a significant role.Aim: To assess response heterogeneity to LT4 treatment, identifying confounders and hidden clusters within a patient panel, we performed a secondary analysis using data from a prospective cross-sectional and retrospective longitudinal study.Methods: Multivariate and multivariable linear models adjusted for covariates (gender, age, and BMI) were stratified by disease-specific treatment indication. During follow-up, pooled observations were compared from the same patient presenting either with or without self-reported symptoms. Statistical analysis was extended to multilevel models to derive intra-class correlation coefficients and reliability measures during follow-up.Results: Equilibria between TSH, FT4, and FT3 serum concentrations in 342 patients were examined by treatment indication (benign goiter, autoimmune thyroiditis, thyroid carcinoma), consequently displaying complex interactive response patterns. Seventy-seven patients treated with LT4 and monitored for thyroid carcinoma presented, in association with changes in LT4 dose, either with hypothyroid symptoms or symptom-free. Significant biochemical differences appeared between the different presentations. Leveled trajectories by subject to relief from hypothyroid symptoms differed significantly, indicating distinct responses, and denying a single shared outcome. These were formally defined by a high coefficient of the intraclass correlation (ICC1, exceeding 0.60 in all thyroid parameters) during follow-up on multiple visits at the same LT4 dose, when lacking symptoms. The intra-personal clusters were clearly differentiated from random variability by random group resampling. Symptomatic change in these patients was strongly associated with serum FT3, but not with FT4 or TSH concentrations. In 25 patients transitioning from asymptomatic to symptomatically hyperthyroid, FT3 concentrations remained within the reference limits, whilst at the same time marked biochemical differences were apparent between the presentations.Conclusions: Considerable intra-individual clustering occurred in the biochemical and symptomatic responses to LT4 treatment, implying statistically multileveled response groups. Unmasking individual differences in the averaged treatment response hereby highlights clinically distinguishable subgroups within an indiscriminate patient panel. This, through well-designed larger clinical trials will better target the different therapeutic needs of individual patients.https://www.frontiersin.org/article/10.3389/fendo.2019.00664/fullintra-class correlationresponse heterogeneityLT4 treatmentthyroid carcinomathyroid homeostasissetpoint |
| spellingShingle | Rudolf Hoermann John E. M. Midgley Rolf Larisch Johannes W. Dietrich Johannes W. Dietrich Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment Frontiers in Endocrinology intra-class correlation response heterogeneity LT4 treatment thyroid carcinoma thyroid homeostasis setpoint |
| title | Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment |
| title_full | Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment |
| title_fullStr | Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment |
| title_full_unstemmed | Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment |
| title_short | Functional and Symptomatic Individuality in the Response to Levothyroxine Treatment |
| title_sort | functional and symptomatic individuality in the response to levothyroxine treatment |
| topic | intra-class correlation response heterogeneity LT4 treatment thyroid carcinoma thyroid homeostasis setpoint |
| url | https://www.frontiersin.org/article/10.3389/fendo.2019.00664/full |
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