Information about Macruz index

In cases of right atrial enlargement the duration of the P wave hardly changes, but the P-R interval increases, so that the P--R segment ratio falls below the normal range.Left atrial enlargement, on the other hand,does not affect the P-R interval, but the P wave lengthens at the expense of the P-R segment.The result is a- ratio above P-R segment the normal maximal limit of 1.6.In combined atrial enlargement, both P-R interval and P wave are prolonged. It follows that in such cases the ratio may P-R segment

be normal.

be normal.

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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Macruz Index is a proportion between the P wave duration and PQ segment (not interval) duration (P/PQ). The idea comes from observation, that there's an ...

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The Macruz index for the diagnosis of atrial enlargement is based on sound physio-logic principles. The electrocardiograms of 88

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The Macruz index in the healthy newborn and infant S. Zoe WaZsh, M.D. Stockholm, Sweden I n 1958, Macruz and associates1 de- scribed a ...

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The Macruz index, the ratio of the durationof the P wave to that of the P-R segment (P-R segment = P-R interval minus P wave duration), reflects the ...

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Macruz index and measurement errors: A critical evaluation on ResearchGate, the professional network for scientists.

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Objective: The aim of this study was to determine whether the Macruz index (P/P-R segment) could predict the severity of valvular involvement and the ...

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Usefulness of the Macruz Index for Predicting Successful Percutaneous Mitral Balloon Valvuloplasty in ... the Macruz index was significantly higher in ...

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Measurements of Macruz index, P wave duration, P-R segment, and P-R interval were made on 592 ECG's from 68 healthy full-term and 82 healthy premature infants.

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