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Right ventricular thallium-201 visualization in hypertrophic cardiomyopathy
T Nishimura1, T Uehara, K Hayashida
1Department of Radiology, National Cardiovascular Centre, Osaka, Japan.
Insights
Right ventricular thallium-201 visualization in hypertrophic cardiomyopathy may indicate increased right ventricular mass. This finding occurs without evidence of right ventricular pressure or volume overload in affected patients.
Area of Science:
- Cardiology
- Nuclear Cardiology
- Cardiovascular Imaging
Background:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Understanding right ventricular (RV) involvement in HCM is crucial for patient management.
- Assessing RV abnormalities using non-invasive imaging techniques is an active area of research.
Purpose of the Study:
- To investigate the occurrence and characteristics of right ventricular (RV) thallium-201 visualization in patients with hypertrophic cardiomyopathy (HCM).
- To determine the correlation between RV thallium-201 uptake and hemodynamic parameters or structural changes in HCM.
- To explore potential underlying mechanisms for RV thallium-201 visualization in HCM.
Main Methods:
- Retrospective analysis of 56 patients diagnosed with hypertrophic cardiomyopathy.
- Echocardiography and cardiac catheterization were performed for all patients.
- Resting thallium-201 scintigraphy was utilized to assess myocardial perfusion and identify RV visualization.
Main Results:
- Right ventricular (RV) thallium-201 visualization was observed in 18% (11 of 56) of patients with hypertrophic cardiomyopathy.
- RV thallium-201 uptake was localized to the apex or lower free wall, distinct from patterns seen in RV pressure or volume overload.
- No significant correlation was found between RV thallium-201 visualization and interventricular septal thickness or hemodynamic data, including RV systolic pressure and dimension.
Conclusions:
- Abnormal increases in right ventricular (RV) mass in hypertrophic cardiomyopathy (HCM) may manifest as RV thallium-201 visualization.
- This visualization can occur independently of RV pressure or volume overload.
- Thallium-201 imaging may provide insights into subclinical RV pathology in HCM.
Abstract:
Fifty-six patients with hypertrophic cardiomyopathy who had echocardiography and cardiac catheterization were studied. Eleven (18%) of 56 patients had right ventricular (RV) thallium-201 visualization at resting scan. RV thallium-201 visualization was observed in the apex or lower half of the RV free wall, which was quite different from that with RV pressure or volume overload. There was no significant correlation between RV thallium-201 visualization and interventricular septal thickness or haemodynamic data. RV systolic pressure and RV dimension were within normal limits whether RV visualization was observed or not. Thus, an abnormal increase of RV mass in hypertrophic cardiomyopathy may lead to RV thallium-201 visualization without RV pressure or volume overload.