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[Evaluation of right ventricular function by quantitative tissue velocity imaging and tissue tracking imaging in neonates with congenital hypothyroidism].
Zhonghua Er Ke Za Zhi. 2007 Aug; 45(8):599-603.ZE

Abstract

OBJECTIVE

Although several reports documented the association of congenital hypothyroidism (CH) and left ventricular (LV) function in infants or neonates, right ventricular (RV) function in neonates with CH has not been previously studied. The aim of the present study was to assess RV function in neonates with CH before and after thyroxine substitution therapy by quantitative tissue velocity imaging (QTVI) and tissue tracking imaging (TTI).

METHODS

Fifty-two neonates aged 18-28 days (25 males and 27 females) with CH and 35 healthy neonates aged 18-28 days (16 males and 19 females) were studied by QTVI, TTI as well as conventional pulsed-wave Doppler echocardiography (PWD). The standard apical four-chamber view for long-axis motion of the right ventricle was used for echocardiographic evaluation. Peak systolic displacement (D), peak systolic velocity (Vs), peak early (Ve) and late (Va) diastolic velocity of tricuspid annule were measured, Ve/Va ratio was calculated as well. Transtricuspid flow velocity during early diastole (E) and late diastole (A) were also measured by pulsed-wave Doppler echocardiography. PWD and E/A ratio were calculated too. For each neonate, serum hormone levels of TSH, TT(3), TT(4), FT(3) and FT(4) were measured with a standard chemiluminescent immunoassay. After 1 month of levothyroxine (L-T(4)) substitution therapy in CH neonates, all the echocardiographic evaluations and biochemical tests were re-evaluated. Correlation analysis was also made between serum thyroid hormones levels and right ventricular function.

RESULTS

The indices of right ventricular diastolic function by PWD (E and E/A ratio) in CH group were (45 +/- 10) cm/s and (0.8 +/- 0.3), respectively. Compared with controls, E and E/A ratio in CH neonates were significantly lower (P < 0.001, respectively), while A did not differ between the two groups (P > 0.05). QTVI and TTI showed that right diastolic function (Ve and Ve/Va ratio) as well as right systolic function (Vs and D) in CH group were (3.69 +/- 1.38) cm/s, (0.74 +/- 0.19) cm/s, (4.38 +/- 0.63) cm/s and (0.52 +/- 0.12) cm, respectively. CH neonates had significantly lower Ve, Ve/Va ratio, Vs and D of tricuspid annular velocity (P < 0.001, respectively), whereas there was no significant difference in Va between the two groups (P > 0.05). After 1 month of substitutive therapy, CH neonates showed a significant increase of Ve, Ve/Va ratio, Vs, D, E, and E/A ratio, (6.92 +/- 1.86) cm/s, (1.13 +/- 0.22), (5.92 +/- 1.03) cm/s, (0.78 +/- 0.17) cm, (61 +/- 10) cm/s and (1.1 +/- 0.4), respectively (P < 0.001). Those parameters were positively correlated with serum TT(3), TT(4), FT(3) and FT(4) levels (P < 0.01, respectively), and were negatively correlated with serum TSH levels (P < 0.01, respectively).

CONCLUSIONS

Our findings suggest that neonates with CH are associated with right ventricular subclinical systolic and diastolic dysfunction, which can be reversed by early L-T(4) substitution therapy. QTVI and TTI are valuable methods to evaluate right ventricular function in neonates. Systolic and diastolic velocities of the tricuspid annulus measured by QTVI and TTI are useful and accurate to assess RV function in neonates.

Authors+Show Affiliations

Department of Health Care, Children's Hospital of Zhejiang University School of Medicine, Hangzhou 310003, China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

English Abstract
Journal Article

Language

chi

PubMed ID

18021534

Citation

Mao, Shan-shan, et al. "[Evaluation of Right Ventricular Function By Quantitative Tissue Velocity Imaging and Tissue Tracking Imaging in Neonates With Congenital Hypothyroidism]." Zhonghua Er Ke Za Zhi = Chinese Journal of Pediatrics, vol. 45, no. 8, 2007, pp. 599-603.
Mao SS, Ye JJ, Jiang GP, et al. [Evaluation of right ventricular function by quantitative tissue velocity imaging and tissue tracking imaging in neonates with congenital hypothyroidism]. Zhonghua Er Ke Za Zhi. 2007;45(8):599-603.
Mao, S. S., Ye, J. J., Jiang, G. P., & Zhao, Z. Y. (2007). [Evaluation of right ventricular function by quantitative tissue velocity imaging and tissue tracking imaging in neonates with congenital hypothyroidism]. Zhonghua Er Ke Za Zhi = Chinese Journal of Pediatrics, 45(8), 599-603.
Mao SS, et al. [Evaluation of Right Ventricular Function By Quantitative Tissue Velocity Imaging and Tissue Tracking Imaging in Neonates With Congenital Hypothyroidism]. Zhonghua Er Ke Za Zhi. 2007;45(8):599-603. PubMed PMID: 18021534.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Evaluation of right ventricular function by quantitative tissue velocity imaging and tissue tracking imaging in neonates with congenital hypothyroidism]. AU - Mao,Shan-shan, AU - Ye,Jing-jing, AU - Jiang,Guo-ping, AU - Zhao,Zheng-yan, PY - 2007/11/21/pubmed PY - 2010/11/17/medline PY - 2007/11/21/entrez SP - 599 EP - 603 JF - Zhonghua er ke za zhi = Chinese journal of pediatrics JO - Zhonghua Er Ke Za Zhi VL - 45 IS - 8 N2 - OBJECTIVE: Although several reports documented the association of congenital hypothyroidism (CH) and left ventricular (LV) function in infants or neonates, right ventricular (RV) function in neonates with CH has not been previously studied. The aim of the present study was to assess RV function in neonates with CH before and after thyroxine substitution therapy by quantitative tissue velocity imaging (QTVI) and tissue tracking imaging (TTI). METHODS: Fifty-two neonates aged 18-28 days (25 males and 27 females) with CH and 35 healthy neonates aged 18-28 days (16 males and 19 females) were studied by QTVI, TTI as well as conventional pulsed-wave Doppler echocardiography (PWD). The standard apical four-chamber view for long-axis motion of the right ventricle was used for echocardiographic evaluation. Peak systolic displacement (D), peak systolic velocity (Vs), peak early (Ve) and late (Va) diastolic velocity of tricuspid annule were measured, Ve/Va ratio was calculated as well. Transtricuspid flow velocity during early diastole (E) and late diastole (A) were also measured by pulsed-wave Doppler echocardiography. PWD and E/A ratio were calculated too. For each neonate, serum hormone levels of TSH, TT(3), TT(4), FT(3) and FT(4) were measured with a standard chemiluminescent immunoassay. After 1 month of levothyroxine (L-T(4)) substitution therapy in CH neonates, all the echocardiographic evaluations and biochemical tests were re-evaluated. Correlation analysis was also made between serum thyroid hormones levels and right ventricular function. RESULTS: The indices of right ventricular diastolic function by PWD (E and E/A ratio) in CH group were (45 +/- 10) cm/s and (0.8 +/- 0.3), respectively. Compared with controls, E and E/A ratio in CH neonates were significantly lower (P < 0.001, respectively), while A did not differ between the two groups (P > 0.05). QTVI and TTI showed that right diastolic function (Ve and Ve/Va ratio) as well as right systolic function (Vs and D) in CH group were (3.69 +/- 1.38) cm/s, (0.74 +/- 0.19) cm/s, (4.38 +/- 0.63) cm/s and (0.52 +/- 0.12) cm, respectively. CH neonates had significantly lower Ve, Ve/Va ratio, Vs and D of tricuspid annular velocity (P < 0.001, respectively), whereas there was no significant difference in Va between the two groups (P > 0.05). After 1 month of substitutive therapy, CH neonates showed a significant increase of Ve, Ve/Va ratio, Vs, D, E, and E/A ratio, (6.92 +/- 1.86) cm/s, (1.13 +/- 0.22), (5.92 +/- 1.03) cm/s, (0.78 +/- 0.17) cm, (61 +/- 10) cm/s and (1.1 +/- 0.4), respectively (P < 0.001). Those parameters were positively correlated with serum TT(3), TT(4), FT(3) and FT(4) levels (P < 0.01, respectively), and were negatively correlated with serum TSH levels (P < 0.01, respectively). CONCLUSIONS: Our findings suggest that neonates with CH are associated with right ventricular subclinical systolic and diastolic dysfunction, which can be reversed by early L-T(4) substitution therapy. QTVI and TTI are valuable methods to evaluate right ventricular function in neonates. Systolic and diastolic velocities of the tricuspid annulus measured by QTVI and TTI are useful and accurate to assess RV function in neonates. SN - 0578-1310 UR - https://www.unboundmedicine.com/medline/citation/18021534/[Evaluation_of_right_ventricular_function_by_quantitative_tissue_velocity_imaging_and_tissue_tracking_imaging_in_neonates_with_congenital_hypothyroidism]_ L2 - http://journal.yiigle.com/LinkIn.do?linkin_type=pubmed&amp;issn=0578-1310&amp;year=2007&amp;vol=45&amp;issue=8&amp;fpage=599 DB - PRIME DP - Unbound Medicine ER -