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Superimposed and synchronized M-mode tracings of the left ventricle with mitral valve (upper panel) and aortic root (lower panel). Phonocardiographic tracing at upper end and ECG tracing at lower end of figure. 

A2: First high frequency component of second heart sound on phonocardiogram.
A-C: Time interval between A (peak anterior movement of anterior leaflet during atrial contraction) and C (mitral valve closure) points of M-mode mitral valve tracing. 
IVCT: Isovolumetric contraction time. 
IVRT: Isovolumetric relaxation time. 
M1: First high frequency component of first heart sound on phonocardiogram. 
P: ECG P wave
QR: Q and R wave of the ECG. 

PR-AC interval

< 60 msec when pulmonary capillary wedge pressure > 14 mmHg.
(Wison et al, 1981)

Palomo formula
LVEDP= 21.6 x (Q-MVC / AVC-E) + 1.1
(Palomo et al., Circulation 1980)

LVEDP: left ventricular end-diastolic pressure. 
Q-MVC: Time interval between ECG Q wave and mitral valve closure point.
AVC-E: Time interval between aortic valve closure point and mitral valve E point (anterior early diastolic excursion of the mitral anterior leaflet).