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Evaluation of Levothyroxine Replacement Therapy After Total Thyroidectomy Using a Smart Wristband (SMART-THY)

24. juli 2026 opdateret af: Banu Erkal, Yeditepe University Hospital

Comparative Evaluation of the Effectiveness of Levothyroxine Replacement Therapy After Total Thyroidectomy Using Smart Wristband-Measured Nocturnal Heart Rate and Heart Rhythm Parameters Versus Thyroid Function Tests

The goal of this observational study is to determine whether nighttime heart rate and heart rhythm data collected by a smart wristband can identify under- or over-replacement with levothyroxine before the routine 1-month thyroid function tests in adults who have undergone total thyroidectomy.

After total thyroidectomy, patients usually start levothyroxine replacement therapy, and the dose is adjusted about 1 month later based on thyroid function tests. This study aims to determine whether changes in nighttime heart rate and heart rhythm can provide an earlier indication that the levothyroxine dose is too low or too high.

The main questions it aims to answer are:

Can nighttime heart rate and heart rhythm measured by a smart wristband identify under- or over-replacement with levothyroxine before routine thyroid function testing? How well do smart wristband measurements agree with thyroid function test results?

Participants will:

Wear a smart wristband after total thyroidectomy. Continue taking levothyroxine as prescribed by their physician. Undergo routine thyroid function testing approximately 1 month after surgery as part of standard clinical care.

Allow researchers to compare smart wristband measurements with thyroid function test results to evaluate whether wearable data can provide an earlier indication of inadequate or excessive levothyroxine replacement.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Total thyroidectomy is commonly performed for both benign and malignant thyroid diseases. Following surgery, lifelong levothyroxine replacement therapy is required to maintain euthyroidism. The initial levothyroxine dose is generally determined according to clinical characteristics such as body weight and is subsequently adjusted based on thyroid function tests, which are routinely performed approximately 4 to 6 weeks after surgery. During this period, some individuals may experience symptoms related to under-replacement or over-replacement before biochemical assessment becomes available.

Thyroid hormones have well-established effects on the cardiovascular system. Alterations in thyroid hormone levels can influence heart rate, cardiac rhythm, and autonomic nervous system activity. Recent advances in wearable technology have enabled continuous, noninvasive monitoring of physiological parameters, including nighttime heart rate and heart rhythm. These measurements may provide early physiological changes associated with inadequate thyroid hormone replacement.

The primary objective of this prospective observational study is to evaluate whether nighttime heart rate and heart rhythm data obtained from a smart wristband can identify under-replacement or over-replacement of levothyroxine before the routine postoperative thyroid function assessment. Smart wristband-derived physiological measurements will be compared with serum thyroid-stimulating hormone (TSH) and free thyroxine (fT4) levels obtained during standard postoperative follow-up.

The study will enroll adults undergoing total thyroidectomy who require postoperative levothyroxine replacement therapy. Participants will wear a smart wristband during the early postoperative period while continuing standard clinical care. No experimental intervention or modification of routine treatment will be performed. The findings may help determine whether wearable device-derived physiological data can serve as an early, noninvasive indicator of inadequate levothyroxine replacement and support more timely dose adjustment after total thyroidectomy.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

40

Kontakter og lokationer

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Studiekontakt

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Studiesteder

Deltagelseskriterier

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Berettigelseskriterier

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  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

The study population consists of adults undergoing total thyroidectomy who require postoperative levothyroxine replacement therapy. Participants will be recruited from the Department of General Surgery at Yeditepe University Koşuyolu Hospital. All participants will receive standard postoperative care and wear a smart wristband during the first postoperative month for continuous monitoring of nighttime heart rate and heart rhythm.

Beskrivelse

Inclusion Criteria:

Age 18 years or older. Undergoing total thyroidectomy at the Department of General Surgery, Yeditepe University Faculty of Medicine Hospital.

Initiation of levothyroxine as part of routine postoperative clinical care. Willing and able to attend the routine 1-month postoperative thyroid function test follow-up visit.

Willing and able to wear the Xiaomi Smart Band 10 throughout the study period. Able to provide written informed consent.

Exclusion Criteria:

History of cardiac arrhythmia. Current use of beta-blockers or other antiarrhythmic medications that may affect heart rate.

History of heart failure or advanced cardiovascular disease. Diagnosed sleep disorders that may interfere with nighttime heart rate measurements.

Pregnancy. Inability or unwillingness to wear the smart wristband as required. Missing clinical or laboratory data required for outcome assessment. Refusal to participate or withdrawal of informed consent.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Total Thyroidectomy Patients Receiving Levothyroxine
Adults undergoing total thyroidectomy who receive standard postoperative levothyroxine replacement therapy. Participants will wear a smart wristband during the early postoperative period to continuously record nighttime heart rate and heart rhythm. They will undergo routine thyroid function testing, including serum thyroid-stimulating hormone (TSH) and free thyroxine (fT4), 1 month after surgery as part of standard clinical care. Smart wristband-derived physiological data will be compared with thyroid function test results to evaluate whether wearable monitoring can identify under- or over-replacement with levothyroxine before the routine 1-month biochemical assessment.
Participants will wear a smart wristband continuously during the first postoperative month following total thyroidectomy. The device will passively record nighttime heart rate and heart rhythm data without affecting routine clinical care. The collected physiological data will be compared with thyroid function test results obtained 1 month after surgery to evaluate whether wearable-derived measurements can identify under- or over-replacement with levothyroxine before routine biochemical assessment.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Diagnostic Performance of Smart Wristband-Derived Nighttime Heart Rate and Heart Rhythm for Detecting Inadequate Levothyroxine Replacement
Tidsramme: 1 month after total thyroidectomy
To evaluate the ability of nighttime heart rate and heart rhythm parameters recorded by a smart wristband during the first postoperative month to identify under- or over-replacement with levothyroxine, using thyroid function tests (TSH and free T4) obtained 1 month after total thyroidectomy as the reference standard.
1 month after total thyroidectomy

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Correlation Between Smart Wristband Physiological Data and Thyroid Function Tests
Tidsramme: 1 month after total thyroidectomy
To assess the correlation between nighttime heart rate and heart rhythm parameters and serum TSH and free thyroxine (fT4) levels measured 1 month after surgery.
1 month after total thyroidectomy
Prediction of Levothyroxine Dose Adjustment
Tidsramme: 1 month after total thyroidectomy
To evaluate whether smart wristband-derived physiological measurements can predict the need for levothyroxine dose adjustment at the first postoperative follow-up visit.
1 month after total thyroidectomy

Samarbejdspartnere og efterforskere

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Sponsor

Publikationer og nyttige links

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Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

22. juli 2026

Primær færdiggørelse (Anslået)

31. december 2026

Studieafslutning (Anslået)

1. februar 2027

Datoer for studieregistrering

Først indsendt

24. juli 2026

Først indsendt, der opfyldte QC-kriterier

24. juli 2026

Først opslået (Faktiske)

29. juli 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

29. juli 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

24. juli 2026

Sidst verificeret

1. juli 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 20260606Y1173

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

Individual participant data will not be shared because the study involves a single-center observational cohort, and no plans have been made for public data sharing. Participant confidentiality and privacy will be protected in accordance with institutional policies and applicable regulations.

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