ECHONOMY
Tools for Echocardiographic Calculations
Muhamed Saric, MD, PhD
New York University


Purpose

To roughly estimate the amount of
pericardial effusion based
on the diastolic thickness of a circumerential pericardial effusion. 
Technical Hints

Chamber and wall thickness
dimensions are obtained in a parasternal view at end diastole. 
Calculator

RV Diameter: 

cm 
Interventricular Septum: 

cm 
LV Diameter: 

cm 
Posterior Wall: 

cm 
Pericardial Effusion Thickness: 

cm 


Answers

Volume of the Pericardial Sac: 

ml 
Volume of the Heart: 

ml 
Volume of Pericardial Effusion: 

ml 


Reference

Teichholz
correction formula for the cube rule (Am J Cardiol
1976;37:711) was used for above volume calculations. Briefly, in the early days of M mode echocardiography, the
volumes of cardiac chambers were calculated by cubing the chamber diameter
(cube rule). That method overestimated the true volume; Teichholz method
corrects for that overestimate.
CUBE RULE >>>> V = D^{3}
TEICHHOLZ >>>> V = [7.0/(2.4 + D)] * D^{3}
where V = volume and D = diameter. 
