Left atrial Function In Echocardiography

Left atrial Function In Echocardiography

Pr Erwan DONAL erwan.donal@chu-rennes.fr

Inserm

Diastole 12 3 4

LA function

LA(mPrmeHssg-u)t/re 17 15 A-Loop 13 11

V-Loop

9 7 5

20 30 40 50 60 70 80

LA Volume

Booster pump F influenced by

?LV Compliance

?LV ?LA

einntdridnisaisctocolincPtPrra.ctility

QRS

Correlated to the LV FILLING Pressure & LA compliance

T

diastole

CONDUIT Active CONT.

Donal et al JASE 2006

systole

Correlated to LV RELAXATION

RESERVOIR

CONDUIT

Atrium as Ventricle is remodeling

AFCI

ADP

Electrical

Wavelength*

Cytosolic Ca++

Ca++

AF Circuit

size

channels Stretch

Zig-Zag conduction

Contractile

Structural

Contractility

Dilatation

Connexins

Anisotropy

Compliance * Wavelength (shortening of refractoriness

Fibrosis

and slowing of conduction

Allessie M. Cardiovasc Res 2002 ; 54 : 230-46

Indices of Atriale emptying: (not used in clinical routine)

1. LA total emptying volume index = LAVImax x LAVImin,

2. LA passive emptying volume index = LAVImax x LAVIpre-a,

3. LA active emptying volume index = LAVIpre-a x LAVImin.

Stefanadis et al. Eur H J 2001 & Manning JACC 1993

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