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Myocardial strain and left ventricular geometry: a meta-analysis of echocardiographic studies in systemic
Marijana Tadic1, Carla Sala2, Stefano Carugo2
1University Hospital 'Dr Dragisa Misovic - Dedinje' Department of Cardiology, Belgrade, Serbia.
Insights
This meta-analysis shows that left ventricular global longitudinal strain (GLS) is a better indicator of systolic dysfunction in hypertensive heart disease than ejection fraction. GLS deteriorates with increasing left ventricular hypertrophy (LVH) and geometric changes.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Hypertension Research
Background:
- Hypertensive heart disease is characterized by abnormal left ventricular (LV) geometry.
- Evidence linking LV mechanics and systolic dysfunction in these patients is limited.
Purpose of the Study:
- To systematically analyze 2D/3D speckle-tracking studies.
- To provide comprehensive information on LV mechanics in hypertensive heart disease with abnormal LV geometry.
Main Methods:
- Systematic meta-analysis of studies published up to January 2021.
- Searched PubMed, OVID-MEDLINE, and Cochrane Library using terms like 'myocardial strain', 'speckle tracking echocardiography', and 'hypertensive heart disease'.
- Included data from 267 controls and 712 hypertensive patients across eight studies.
Main Results:
- Ejection fraction was similar between normotensive and hypertensive groups.
- LVMI and E/e' increased with worsening LV geometry (normal, concentric remodeling, eccentric LVH, concentric LVH).
- LV global longitudinal strain (GLS) was significantly lower in all hypertensive groups, particularly in eccentric and concentric LVH, and showed a progressive decline with increasing LVH severity.
Conclusions:
- GLS is superior to ejection fraction in detecting systolic dysfunction in hypertensive patients.
- GLS decline is associated with structural and geometric alterations in the LV, such as LVH.
Aim:
Evidence on systolic dysfunction, as assessed by left ventricular (LV) mechanics, in hypertensive heart disease phenotyped by abnormal LV geometric patterns is still limited. Thus, we performed a systematic meta-analysis of 2D/3D speckle-tracking studies in order to provide an updated comprehensive information on this topic.
Methods:
The PubMed, OVID-MEDLINE, and Cochrane library databases were analyzed to search for articles published from the inception up to 31 January 2021. Studies were identified by using MeSH terms and crossing the following search items: 'myocardial strain', 'left ventricular mechanics', 'speckle tracking echocardiography', 'systolic dysfunction', 'hypertensive heart disease', 'left ventricular hypertrophy', left ventricular remodeling", 'concentric hypertrophy', 'eccentric hypertrophy'.
Results:
Overall, data of 267 normotensive controls and 712 hypertensive patients (234 normal geometry, 97 LV concentric remodeling, 176 eccentric LVH, and 205 concentric LVH) from eight studies were considered. Pooled ejection fraction was similar in normotensives and in the whole group of hypertensive patients: (SMD 0.037 ± 0.05, confidence interval (CI): 0.14/0.07, P = 0.51) as well as in hypertensive subgroups. LVMI, and E/e' gradually increased from hypertensive patients with normal geometry and concentric remodeling, to patients with eccentric and concentric LVH. LV global longitudinal strain (GLS) was lower in all hypertensive groups compared with normotensive controls, in particular, in the eccentric (SMD 1.14 ± 0.22, CI: 0.69/1.59, P < 0.0001) and concentric LVH group (SMD 1.37 ± 0.21, CI: 0.95/1.79, P < 0.0001). The meta-analysis restricted to hypertensive patients showed that GLS gradually deteriorated from hypertensive patients with normal LV geometry, across those with concentric remodeling, to participants with eccentric and concentric LVH (-19.5 ± 0.6 versus -18.8 ± 0.73 versus -17.6 ± 0.66 versus -16.5 ± 0.6%, P < 0.001 for trend). Statistical significance was reached when GLS of the concentric and eccentric LVH group but not the concentric remodeling was compared with the normal geometry one.
Conclusion:
The present meta-analysis confirms that GLS performs better than ejection fraction in identifying systolic dysfunction in the hypertension setting. More importantly, it suggests that this occurs in patients with altered LV structure and geometry, such as LVH.
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