LV Mass Index Calculator
Calculate left ventricular mass, LVMI, and relative wall thickness from echocardiography measurements using the Devereux formula.
What Is Left Ventricular Mass Index?
Left ventricular mass index (LVMI) adjusts left ventricular mass for body size using body surface area (BSA). Echocardiography measures chamber dimensions and wall thickness, which feed into the Devereux formula to estimate LV mass in grams. LVMI helps assess cardiac hypertrophy and cardiovascular risk. For related hemodynamic measures, see the Cardiac Index Calculator.
How LV Mass and LVMI Are Calculated
LV mass uses the Devereux equation: 0.8 × [1.04 × ((LVEDD + IVSd + PWd)³ − LVEDD³)] + 0.6, with LVEDD, IVSd, and PWd in centimeters. LVMI equals LV mass divided by BSA in g/m². Relative wall thickness (RWT) is (2 × PWd) / LVEDD. When BSA is unknown, height and weight compute Haycock BSA automatically.
Interpreting LVMI and Wall Geometry
Normal LVMI is 43–95 g/m² for women and 49–115 g/m² for men. Values above these ranges indicate mild, moderate, or severe enlargement by sex. Combined with RWT, patterns are classified: concentric hypertrophy (elevated LVMI and RWT above 0.42), eccentric hypertrophy (elevated LVMI with RWT 0.42 or below), concentric remodeling (normal LVMI with RWT above 0.42), or normal geometry. Always interpret echo findings in clinical context.
Frequently Asked Questions
What echocardiography measurements are needed?
You need left ventricular end-diastolic dimension (LVEDD), interventricular septal thickness at end diastole (IVSd), and posterior wall thickness at end diastole (PWd), all typically reported in millimeters on an echo report.
What is a normal LVMI for women and men?
Normal LVMI is 43–95 g/m² for women and 49–115 g/m² for men. Mild, moderate, and severe enlargement thresholds differ by sex and should be applied accordingly.
What does relative wall thickness indicate?
RWT compares wall thickness to cavity size. Values above 0.42 suggest relatively thick walls. Combined with LVMI, RWT helps distinguish concentric from eccentric hypertrophy and remodeling.
Why is BSA used in the LVMI calculation?
Larger body size naturally correlates with larger hearts. Indexing LV mass to body surface area allows fair comparison across patients of different heights and weights.
What is concentric versus eccentric hypertrophy?
Concentric hypertrophy shows increased mass with thick walls (RWT above 0.42), often from pressure overload. Eccentric hypertrophy shows increased mass with relatively thin walls, often from volume overload.
Can this calculator replace a cardiologist's reading?
No. This tool applies standard formulas for education and quick estimates. Clinical decisions require a full echocardiogram report, image quality review, and evaluation by a qualified clinician.
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