Published on March 5, 2014
Macruz index Left atrial enlargement
CRHD,SEVRE MS,LAE,RVH,PAH:Chest X-Ray LAE:Straightned left heart border
CRHD,SEVRE MS,LAE,RVH,PAH:12 lead ECG
Morris index A to B=0.12sec B to C=2mm ABXBC=0.12X2=0.24mmxsec≥0.0 4mmxsec Multiply the length x breadth of the terminal negative portion of the P wave in lead V1 (the P terminal force). This gives the Morris index. The area exceeds 0.04 mm-sec in left atrial enlargement. (one small square on the ECG taken at 25 mm / sec paper speed)
Macruz index A to B=widened P width=1.6mm B to C=narrowed PR segment=0.4mm P/PR segment ≥1.6
http://circ.ahajournals.org/content/27/5/935.full.pdf In 1958, Macruz, Perloff, and Case1 proposed a simple formula for electrocardiographic recognition of right, left, and combined atrial enlargement. The Macruz index has been widely used in recent years. It is based on the measurement of the P-R interval,P-wave duration, and P-R segment (time between end of electric atrial systole and onset of electric ventricular systole). According to the above authors, the ratio of the P-wave duration to the P-R segment as measured in standard lead II in normal persons, is relatively constant within the limits of 1.0 and 1.6, with an average value of 1.2.
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