VENTRICULAR VOLUMES EJECTION FRACTION MASS WALL STRESS REGIONAL WALL MOTION
description
Transcript of VENTRICULAR VOLUMES EJECTION FRACTION MASS WALL STRESS REGIONAL WALL MOTION
VENTRICULAR VOLUMESEJECTION FRACTION
MASSWALL STRESS
REGIONAL WALL MOTION
Márcio Alves de Urzêda, M.D.; MSc
VOLUMES(Technical considerations)
• Cine film: – 15-60 fps;
• Radiographic contrast:– 7-15mL/s and 30-50mL.
• Sites:– Left ventricle;– Left atrium (trans-septal technique);– Severe aortic insufficiency:
• Aortic root.
Ventricular volumes
• Silhouette must be traced:– Marged visible
contrast;– Include
trabeculations and papillary muscles.
Ventricular volumes
• Approximated by an ellipsoid;• Regression equations correct the
overestimation.• Biplane projection to • determinate M and N.
Ventricular volumes
• Area-length method (Dodge);• Biplane oblique (RAO/LAO):
Ventricular volumes
Single plane formula:
•AP or RAO;•Left ventricular shape is a spheroid (ellipsoid wich two minor axes are equal).
VENTRICULAR VOLUMES
• Volume correction:– Overestimation by papillary muscles and
trabeculaes.
• Regression equations
EJECTION FRACTIONREGURGITANT FRACTION
• EF= (EDV-ESV) EDV
• RF= SV angiographic – ESV forward) SV angiographic
Left Ventricular Mass
• Is assumed that wall thickness is uniform
Wall Stress• σ = PR 2h
• Meridional, radial and circunferencial.
A and B: semi-axis
REGIONAL LEFT VENTRICULAR WALL MOTION
• Akinesis, dyskinesis, hypokinesis and hyperkinesis.