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Published on: April 30, 2020
Left Ventricular Functional Alterations across Types and Severity of Hypertrophy
Vivek Sullere1, Idris Ahmed Khan2, Rakesh Gupta3
1Department of Non-Invasive Cardiology, Bombay Hospital, Indore, Madhya Pradesh, India.
Insights
Left ventricular hypertrophy (LVH) worsens heart function, with reduced ejection fraction (EF) and impaired systolic/diastolic filling. Global longitudinal strain (GLS) detects early dysfunction and predicts effort tolerance even in mild LVH.
Area of Science:
- Cardiology
- Echocardiography
- Heart Failure Research
Background:
- Left ventricular hypertrophy (LVH) is a significant risk factor for chronic heart failure, even with preserved ejection fraction (EF).
- Systolic contraction impairment and abnormal diastolic filling are implicated in heart failure progression.
- Understanding LVH's impact on cardiac function is crucial for managing heart failure.
Purpose of the Study:
- To evaluate changes in left ventricular (LV) function across different types and severities of LVH.
- To correlate LVH characteristics with markers of systolic and diastolic dysfunction.
- To assess the role of global longitudinal strain (GLS) in early LV dysfunction detection.
Main Methods:
- Retrospective analysis of 518 echocardiography-confirmed LVH patients.
- Patients categorized by LV mass index, wall thickness, and relative wall thickness.
- Comparison with 707 healthy subjects; analysis of echocardiographic and exercise tolerance data.
Main Results:
- LV function markers (EF, GLS, MV s', TAPSE, TV s') declined progressively with increasing LVH severity.
- Indices of elevated filling pressure (E/e') and pulmonary pressure (RVSP) increased with LVH severity.
- Eccentric LVH mirrored severe LVH; concentric remodeling mirrored mild LVH.
Conclusions:
- LV function parameters (EF, GLS, effort tolerance, MVs', E/e') progressively derange with LVH severity.
- Right ventricular (RV) function (TAPSE, TVs') and pulmonary artery pressure (RVSP) also deteriorate with increasing LVH.
- GLS is a sensitive marker for early LV dysfunction and predicts effort tolerance, even in mild LVH.
Introduction:
Left ventricular hypertrophy (LVH) increases the risk of chronic heart failure. Even with preserved ejection fraction (EF), mortality remains significant. Impaired systolic contraction and abnormal diastolic filling may contribute to heart failure progression.
Objective:
To evaluate changes in left ventricular (LV) function based on LVH type and severity.
Methods:
Retrospective analysis of 518 echocardiography-confirmed LVH patients, categorized by wall thickness, LV mass index, and relative wall thickness into mild, moderate, severe, concentric remodeling, concentric hypertrophy, and eccentric hypertrophy. Comparisons were made with 707 healthy subjects from a prior study. Echocardiographic and exercise tolerance data were analyzed.
Results:
LV function markers of LV systolic and diastolic dysfunction - including EF, global longitudinal strain (GLS), treadmill test metabolic equivalents, mitral annular systolic velocity (MV s'), tricuspid systolic velocity (TV s'), and tricuspid annular plane systolic excursion (TAPSE) - declined progressively with increasing LVH severity. Conversely, indices of elevated filling pressure (E/e') and pulmonary pressure (right ventricular systolic pressure [RVSP]) increased with increasing LVH severity.
Conclusion:
Parameters of LV function such as left ventricular EF, GLS, effort tolerance, MVs', and E/e' get progressively deranged as LV hypertrophy deteriorates. Simultaneous derangement of RV function is observed in TAPSE and TVs'. Pulmonary artery pressure by RVSP increases with increasing severity of LVH. Eccentric LVH resembles severe LVH, while concentric remodeling resembles mild LVH. GLS detects early LV dysfunction and predicts effort tolerance, even in mild LVH.
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