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Additional mechanism for left ventricular dysfunction: chronic pulmonary regurgitation decreases left ventricular preload in patients with tetralogy of Fallot

Published online by Cambridge University Press:  11 October 2017

Pekka Ylitalo ,
Eero Jokinen ,
Kirsi Lauerma ,
Miia Holmström  and
Olli M. Pitkänen-Argillander
Pekka Ylitalo
Affiliation:
Children’s Hospital, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
Eero Jokinen
Affiliation:
Children’s Hospital, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
Kirsi Lauerma
Affiliation:
Helsinki Medical Imaging Center, Helsinki University Central Hospital, Helsinki, Finland
Miia Holmström
Affiliation:
Helsinki Medical Imaging Center, Helsinki University Central Hospital, Helsinki, Finland
Olli M. Pitkänen-Argillander*
Affiliation:
Children’s Hospital, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
*
Correspondence to: Dr O. M. Pitkänen-Argillander, Children’s Hospital, University of Helsinki, Stenbäckinkatu 11, PL 281, HUS, Finland. Tel: +358 5 0427 0939; Fax: +358 9 47175306; E-mail: olli.pitkanen@hus.fi
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Abstract

Background

Right ventricular dysfunction in patients with tetralogy of Fallot and significant pulmonary regurgitation may lead to systolic dysfunction of the left ventricle due to altered ventricular interaction. We were interested in determining whether chronic pulmonary regurgitation affects the preload of the left ventricle. In addition, we wanted to study whether severe chronic pulmonary regurgitation would alter the preload of the left ventricle when compared with patients having preserved pulmonary valve annulus.

Methods

The study group comprised 38 patients with tetralogy of Fallot who underwent surgical repair between 1990 and 2003. Transannular patching was required in 21 patients to reconstruct the right ventricular outflow tract. Altogether, 48 age- and gender-matched healthy volunteers were recruited. Cardiac MRI was performed on all study patients to assess the atrial and ventricular volumes and function.

Results

Severe pulmonary regurgitation (>30 ml/m2) was present in 13 patients, of whom 11 had a transannular patch, but only two had a preserved pulmonary valve annulus. The ventricular preload volumes from both atria were significantly reduced in patients with severe pulmonary regurgitation, and left ventricular stroke volumes (44.1±4.7 versus 58.9±10.7 ml/m2; p<0.0001) were smaller compared with that in patients with pulmonary regurgitation <30 ml/m2 or in controls.

Conclusions

In patients with tetralogy of Fallot, severe pulmonary regurgitation has a significant effect on volume flow through the left atrium. Reduction in left ventricular preload volume may be an additional factor contributing to left ventricular dysfunction.

Keywords

Tetralogy of Fallotpulmonary regurgitationleft ventricular preloadtransannular patch
Type
Original Articles
Information
Cardiology in the Young , Volume 28 , Issue 2 , February 2018 , pp. 208 - 213
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Copyright
© Cambridge University Press 2017 

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