Measurement was done at the peak of the R wave on a simultaneously recorded ECG.
Parameters (from Figure 1, page 614):
(1) LVIDp = left ventricular internal dimension in cm using the Penn convention
(2) PWTp = posterior wall thickness in cm using the Penn convention
(3) IVSTp = interventricular septal thickness in cm using the Penn convention
The Penn convention differs from the standard echocardiographic measurement by:
(1) excluding the right and left septal endocardial echo thicknesses from IVST
(2) excluding the posterior wall endocardial echo thickness from the PWT
(3) including the left septal and posterior wall endocardial echo thicknesses in the LVID
left ventricular mass in grams =
= (1.04 * ((((LVIDp) + (PWTp) + (IVSTp))^3) - ((LVIDp)^3))) - 13.6
