Legal. Mas dá um trabalho…

Beto Matos-Souza

https://academic.oup.com/ehjcimaging/article/22/3/259/6012914

(A and B) Schematically how echocardiography and brachial artery cuff pressure are used to obtain a non-invasive LV pressure curve are shown. (C) LV pressure strain–loops from a normal subject and a patient with cardiomyopathy. Global and segmental LV pressure–strain loops are displayed as well as segmental bull’s eye plots. The patient with cardiomyopathy has reduced area of the pressure–strain loop, which means reduced global LV work. (D) Myocardial work in a patient with heart failure and left bundle branch block (LBBB) who is evaluated for CRT. The upper half illustrates work distribution. The small area of the septal pressure–strain loop indicates that very little work is done by the septum. Furthermore, during parts of systole the septum is stretched, which means negative work, as indicated by counter clockwise rotation of the loop. The lateral wall segments show compensatory hypercontraction and a large loop. The lower half illustrates use of LV lateral wall-to-septal work difference to identify responders to CRT. For this calculation, it is sufficient to measure in only a single plane, the apical four-chamber, and use only the basal and mid segments in septum and lateral wall. The work difference is calculated by using the average value from two segments.

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