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Influence of L-thyroxine on cardiac function in athyreotic thyroid cancer patients — An echophonocardiographic study

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Summary

We have assessed left ventricular performance in twelve athyreotic patients by echophonocardiography during and after their follow-up investigations. Patients were investigated after 4 weeks without and after 2 as well as 4 weeks of therapy with 150–200 µg L-thyroxine (L-T4). At the end of 4 weeks withdrawal of L-T4 patients were severely hypothyroid in terms of T4 and thyrotropin (TSH) serum levels as well as total cholesterol plasma levels. In comparison to values obtained in 12 age and sex matched normal controls left ventricular preejection period was prolonged at that time point (110∓20 vs. 90∓20 (SD) ms,p<0.05) and the isovolumetric relaxation period (IVRP) was significantly lengthened (78∓16 vs 54∓10 ms,p<0.01). Left ventricular ejection phase indices (fractional shortening and mean velocity of circumferential fiber shortening) did not differ significantly from normal. Preejection period dropped to 90∓20 ms (p<0.05) after 4 weeks of therapy with L-T4. IVRP decreased to 67∓13 ms (p<0.01) but remained significantly prolonged compared to normal. Serum T4, TSH and plasma cholesterol were compatible with borderline hyperthyroidism at that thime point.

Thus, systolic as well as diastolic left ventricular performance (especially during isovolumic phases) appear to respond rapidly to thyroid hormone deficiency of short duration and at least partly to resupplementation.

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Abbreviations

IVRP:

isovolumetric relaxation period

L-T4 :

L-thyroxine

PEP:

preejection period

TSH:

thyrotropin

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Authors and Affiliations

  1. II. Medizinische Universitäts-Klinik, Allgemeines Krankenhaus der Stadt Wien, Österreich

    Ch. Punzengruber & M. Weissel

  2. Ludwig Boltzmann Institut für Nuklear Medizin, Wien, Österreich

    M. Weissel

Authors
  1. Ch. Punzengruber
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  2. M. Weissel
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Herrn Prof. Dr. Rudolf Höfer zum 65. Geburtstag gewidmet

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Punzengruber, C., Weissel, M. Influence of L-thyroxine on cardiac function in athyreotic thyroid cancer patients — An echophonocardiographic study. Klin Wochenschr 66, 729–735 (1988). https://doi.org/10.1007/BF01726416

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  • DOI: https://doi.org/10.1007/BF01726416

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