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.

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 ...

Read more

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

Read more

Statistik. Es befinden sich 4 aktive Nutzer mit dem Nachnamen Macruz in der Datenbank; Es befinden sich 6 Profile mit dem Nachnamen Macruz in der Datenbank

Read more

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 ...

Read more

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 ...

Read more

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

Read more

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 ...

Read more

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

Read more

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.

Read more

## Add a comment