Abstract
Background
Hereditary haemochromatosis is often not diagnosed until adulthood. Iron overload cardiomyopathy initially results in diastolic dysfunction and can result in arrhythmias and irreversible cardiac failure if untreated. The aim of this study was to investigate whether patients with newly diagnosed hereditary haemochromatosis without signs of heart failure exhibit subclinical alterations of cardiac function and to determine if cardiac function improved after 1 year of venesection.
Methods
Baseline echocardiography was performed on 25 patients with newly diagnosed hereditary haemochromatosis with elevated serum ferritin levels. The test was repeated after 1 year of treatment with venesection. Tissue Doppler imaging (TDI) and deformation (strain) imaging using speckle tracking were performed. Left atrial force was measured according to the Newtonian principle, in which force (dynes) = mass × acceleration. Left atrial force was calculated by the Manning method expressed as ρ × 0.53 × mitral annular orifice area × (peak A velocity)2.
Results
Radial strain showed a significant improvement after 1 year of venesection (increase from 38.8 to 52.6). The LAF showed a significant decrease after 1 year of venesection (median decrease = 0.6 (IQR 0, 1.60), p = 0.0004). Iso-volumetric relaxation time (IVRT) decreased significantly in patients after 1 year of venesection (decrease from 107.4 ± 16.2 to 97.68 ± 15.4 ms, p (0.0187)).
Conclusion
Among all measurements, radial strain, IVRT and left atrial force were shown to significantly improve following a 1-year course of venesection, suggesting that these parameters could be used to identify subclinical cardiac dysfunction in patients with iron overload secondary to hereditary haemochromatosis and to guide intensification of venesection therapy.
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Acknowledgments
We would like to acknowledge and sincerely thank Ms. Liz Ellis who was the clinical nurse specialist for venesection treatment in St James Hospital at the time of our study.
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The Local Research Ethics Committee approved the study. Informed consent was obtained from each patient. Standard views and techniques were used according to the American Society of Echocardiography (ASE)/European Association of Echocardiography (EAE) guidelines.
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Glossary
- ASE
-
American Society of Echocardiography
- UIBC
-
unsaturated iron binding capacity
- BSA
-
body surface area
- EAE
-
European Association of Echocardiography
- Fe
-
ferritin
- Hb
-
haemoglobin
- HH
-
hereditary haemochromatosis
- IVRT
-
iso-volumetric relaxation time
- LAF
-
left atrial force
- LAV max
-
left atrial volume
- LV
-
left ventricular
- MRI
-
magnetic resonance imaging
- STE
-
speckle tracking echocardiography
- TEI
-
myocardial performance index
- TIBC
-
total iron binding capacity
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Byrne, D., Walsh, J.P., Daly, C. et al. Improvements in cardiac function detected using echocardiography in patients with hereditary haemochromatosis. Ir J Med Sci 189, 109–117 (2020). https://doi.org/10.1007/s11845-019-02032-5
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DOI: https://doi.org/10.1007/s11845-019-02032-5