open access

Vol 19, No 3 (2012)
Original articles
Published online: 2012-05-28
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Evaluation of left atrial mechanical functions and atrial conduction abnormalities in patients with clinical hypothyroid

Serkan Ozturk, Oguz Dikbas, Mehmet Ozyasar, Selim Ayhan, Fatih Ozlu, Davut Baltaci, Alim Erdem, Aytekin Alcelik, Mehmet Tosun, Mehmet Yazici
Cardiol J 2012;19(3):287-294.

open access

Vol 19, No 3 (2012)
Original articles
Published online: 2012-05-28

Abstract


Background: The aim of this study was to investigate left atrial (LA) mechanical functions, atrial electromechanical delay and P wave dispersion in hypothyroid patients.
Methods: Thirty-four patients with overt hypothyroid and thirty controls were included. A diagnosis of overt hypothyroid was reached with increased serum TSH and decreased free T4 (fT4) levels. LA volumes were measured using the biplane area length method and LA active and passive emptying volumes and fraction were calculated. Intra- and interatrial electromechanical delay (EMD) were measured by tissue Doppler imaging (TDI). P wave dispersion was calculated by 12 lead electrocardiograms.
Results:
LA diameter were significantly higher in patients with overt hypothyroid (p = 0.021). LA passive emptying volume and LA passive emptying fraction were significantly decreased with hypothyroid patients (p = 0.002 and p < 0.001). LA active emptying volume and LA active emptying fraction were significantly increased with hypothyroid patients (p < 0.001 and p < 0.001). Intra- and interatrial EMD, were measured significantly higher in hypothyroid patients (30.6 ± 6.1 vs 18.0 ± 2.7, p < 0.001; and 10.6 ± 3.4 vs 6.9 ± 1.4, p < 0.001, respectively). P wave dispersion were significantly higher in hypothyroid patients (48.8 ± 6.2 vs 44.3 ± 7.2, p = 0.022). In stepwise regression analysis demonstrated that, interatrial EMD and LA active emptying fraction related with TSH and fT4.
Conclusions: This study showed that impaired LA mechanical and electromechanical function in hypothyroid patients. TSH and T4 were independent determinant of interatrial EMD and LA active emptying fraction.

Abstract


Background: The aim of this study was to investigate left atrial (LA) mechanical functions, atrial electromechanical delay and P wave dispersion in hypothyroid patients.
Methods: Thirty-four patients with overt hypothyroid and thirty controls were included. A diagnosis of overt hypothyroid was reached with increased serum TSH and decreased free T4 (fT4) levels. LA volumes were measured using the biplane area length method and LA active and passive emptying volumes and fraction were calculated. Intra- and interatrial electromechanical delay (EMD) were measured by tissue Doppler imaging (TDI). P wave dispersion was calculated by 12 lead electrocardiograms.
Results:
LA diameter were significantly higher in patients with overt hypothyroid (p = 0.021). LA passive emptying volume and LA passive emptying fraction were significantly decreased with hypothyroid patients (p = 0.002 and p < 0.001). LA active emptying volume and LA active emptying fraction were significantly increased with hypothyroid patients (p < 0.001 and p < 0.001). Intra- and interatrial EMD, were measured significantly higher in hypothyroid patients (30.6 ± 6.1 vs 18.0 ± 2.7, p < 0.001; and 10.6 ± 3.4 vs 6.9 ± 1.4, p < 0.001, respectively). P wave dispersion were significantly higher in hypothyroid patients (48.8 ± 6.2 vs 44.3 ± 7.2, p = 0.022). In stepwise regression analysis demonstrated that, interatrial EMD and LA active emptying fraction related with TSH and fT4.
Conclusions: This study showed that impaired LA mechanical and electromechanical function in hypothyroid patients. TSH and T4 were independent determinant of interatrial EMD and LA active emptying fraction.
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Keywords

atrial functions; interatrial delay; thyroid hormones

About this article
Title

Evaluation of left atrial mechanical functions and atrial conduction abnormalities in patients with clinical hypothyroid

Journal

Cardiology Journal

Issue

Vol 19, No 3 (2012)

Pages

287-294

Published online

2012-05-28

Bibliographic record

Cardiol J 2012;19(3):287-294.

Keywords

atrial functions
interatrial delay
thyroid hormones

Authors

Serkan Ozturk
Oguz Dikbas
Mehmet Ozyasar
Selim Ayhan
Fatih Ozlu
Davut Baltaci
Alim Erdem
Aytekin Alcelik
Mehmet Tosun
Mehmet Yazici

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