How do you calculate LV mass?
Left ventricular mass is generally calculated as the difference between the epicardium delimited volume and the left ventricular chamber volume multiplied by an estimate of myocardial density.
What is left ventricular mass?
Left ventricular (LV) mass is the weight of the left ventricle, typically estimated using echocardiography, and is thought to represent the cumulative effect of blood pressure on the heart. It is closely related to body size, greater in men than in women, and increases with age.
How do you calculate relative wall thickness?
Relative wall thickness (RWT) is measured in clinical studies both as: 2 * posterior wall thickness divided by LV diastolic diameter or, septal wall thickness + posterior wall thickness divided by LV diastolic diameter.
What is normal relative wall thickness?
According to the ASE/EAE, RWT of 0.22 to 0.42 was regarded as normal. The geometric changes of the left ventricle were classified based on left ventricular mass index and relative wall thickness.
How is LV mass by Echo calculated?
The M-mode LV mass was calculated using corresponding equations (ASE: LV mass = 0.8[1.04(LVD + IVS + PW)3 – LVD3] + 0.6 g; and Penn: LV mass = 1.04[(LVD + IVS + PW)3 – LVD3] – 13.6 g), and the 2D LV mass was calculated by applying the ASE M-mode equation.
What is normal LV mass in grams?
Normal values of LV mass indexed to body surface area were found to be 70 ± 9 g/m(2) in men and 61 ± 8 g/m(2) in women. Significant age and gender dependence, but no racial dependence, was observed for LV mass index. Conclusions: Three-dimensional echocardiography is an accurate method for measuring LV mass.
What is LV mass Al index?
Indexed LV mass by body surface area is an independent predictor of sudden cardiac death and may help improve the risk prediction of sudden cardiac death beyond conventional cardiovascular risk factors.
What is eccentric LVH?
Eccentric left ventricular hypertrophy is induced by an increased filling pressure of the left ventricle, otherwise known as diastolic overload, which represents the underlying mechanism for volumetric or diastolic overload in patients with regurgitant valve lesions such as aortic or mitral regurgitation as well as in …
What is the specific gravity of myocardium?
1.055 g/cm3
LV mass is obtained by multiplying the LV volume with the specific gravity of myocardium γ=1.055 g/cm3.
How is ventricular hypertrophy calculated?
Sokolow-Lyon Criteria: Add the S wave in V1 plus the R wave in V5 or V6. If the sum is greater than 35 mm, LVH is present. Romhilt-Estes LVH Point Score System: If the score equals 4, LVH is present with 30% to 54% sensitivity. If the score is greater than 5, LVH is present with 83% to 97% specificity.
What is normal LV mass index?
Normal values of LV mass indexed to body surface area were found to be 70 ± 9 g/m 2 in men and 61 ± 8 g/m 2 in women. Significant age and gender dependence, but no racial dependence, was observed for LV mass index. Three-dimensional echocardiography is an accurate method for measuring LV mass.
What is mass conservation equation?
Thus, the chemical equation can be written as a statement about masses of reactants and products: The total mass on the left side is 116.25 g + 415.95 g = 532.2 g, and the total mass on the right is 352.0 g + 180.14 g = 532.2 g. Thus, mass conservation is satisfied.
What is mass energy equation?
Definition of mass-energy equation. : an equation for the interconversion of mass and energy: E = MC2 where E is energy in ergs, M is mass in grams, and C is the velocity of light in centimeters per second — called also Einstein equation ; compare conservation of energy, conservation of mass.
What is mass percent equation?
Mass Percent Formula. Mass percent is used as a way of expressing a concentration or a way of describing a component in a mixture. For a solution, the mass percent is expressed as the grams of solute divided by the grams of solution, then multiplied by 100 to get a percentage.