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Journal of Cardiovascular Magnetic Resonance

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Open Access 01-12-2016 | Research

Cardiovascular magnetic resonance of mitral valve length in hypertrophic cardiomyopathy

Authors: Mika Tarkiainen, Petri Sipola, Mikko Jalanko, Tiina Heliö, Mika Laine, Vesa Järvinen, Kaisu Häyrinen, Kirsi Lauerma, Johanna Kuusisto

Published in: Journal of Cardiovascular Magnetic Resonance | Issue 1/2017

Abstract

Background

Previous data suggest that mitral valve leaflets are elongated in hypertrophic cardiomyopathy (HCM), and mitral valve leaflet elongation may constitute a primary phenotypic expression of HCM. Our objective was to measure the length of mitral valve leaflets by cardiovascular magnetic resonance (CMR) in subjects with HCM caused by a Finnish founder mutation in the myosin-binding protein C gene (MYBPC3-Q1061X), carriers of the same mutation without left ventricular hypertrophy, as well as in unselected consecutive patients with HCM, and respective controls.

Methods

Anterior mitral valve leaflet (AML) and posterior mitral valve leaflet (PML) lengths were measured by CMR in 47 subjects with the Q1061X mutation in the gene encoding MYBPC3 and in 20 healthy relatives without the mutation. In addition, mitral valve leaflet lengths were measured by CMR in 80 consecutive non-genotyped patients with HCM in CMR and 71 age- and gender-matched healthy subjects.

Results

Of the subjects with the MYBPC-Q1016X mutation, 32 had left ventricular hypertrophy (LVH, LV maximal wall thickness ≥ 13 mm in CMR) and 15 had no hypertrophy. PML was longer in patients with the MYBPC3-Q1061X mutation and LVH than in controls of the MYBPC group (12.8 ± 2.8 vs 10.6 ± 1.9 mm, P = 0.013), but the difference between the groups was not statistically significant when PML was indexed for BSA (P = 0.066), or when PML length was adjusted for BSA, age, gender, LV mass and ejection fraction (P = 0.195). There was no significant difference in the PML length in mutation carriers without LVH and controls (11.1 ± 3.4 vs 10.6 ± 1.9, P = 0.52). We found no difference in AML lengths between the MYBPC mutation carriers with or without hypertrophy and controls. In 80 consecutive non-genotyped patients with HCM, there was no difference either in AML or PML lengths in subjects with HCM compared to respective control subjects.

Conclusions

In subjects with HCM caused by the Q1061X mutation in the MYBPC3 gene, the posterior mitral valve leaflets may be elongated, but mitral valve elongation does not constitute primary phenotypic expression of the disease. Instead, elongated mitral valve leaflets seem to be associated with body size and left ventricular remodeling.

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Title: Cardiovascular magnetic resonance of mitral valve length in hypertrophic cardiomyopathy
Authors: Mika Tarkiainen
Petri Sipola
Mikko Jalanko
Tiina Heliö
Mika Laine
Vesa Järvinen
Kaisu Häyrinen
Kirsi Lauerma
Johanna Kuusisto
Publication date: 01-12-2016
Publisher: BioMed Central
Published in: Journal of Cardiovascular Magnetic Resonance / Issue 1/2017
Electronic ISSN: 1532-429X
DOI: https://doi.org/10.1186/s12968-016-0250-5

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Cardiovascular magnetic resonance of mitral valve length in hypertrophic cardiomyopathy

Abstract

Background

Methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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