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VENTRICULAR VOLUMES EJECTION FRACTION MASS WALL STRESS REGIONAL WALL MOTION

VENTRICULAR VOLUMES EJECTION FRACTION MASS WALL 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);

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VENTRICULAR VOLUMES EJECTION FRACTION MASS WALL STRESS REGIONAL WALL MOTION

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  1. VENTRICULAR VOLUMESEJECTION FRACTIONMASSWALL STRESSREGIONAL WALL MOTION Márcio Alves de Urzêda, M.D.; MSc

  2. 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.

  3. Ventricular volumes • Silhouette must be traced: • Marged visible contrast; • Include trabeculations and papillary muscles.

  4. Ventricular volumes • Approximated by an ellipsoid; • Regression equations correct the overestimation. • Biplane projection to • determinate M and N.

  5. Ventricular volumes • Area-length method (Dodge); • Biplane oblique (RAO/LAO):

  6. Ventricular volumes • Single plane formula: • AP or RAO; • Left ventricular shape is a spheroid (ellipsoid wich two minor axes are equal).

  7. VENTRICULAR VOLUMES • Volume correction: • Overestimation by papillary muscles and trabeculaes. • Regression equations

  8. EJECTION FRACTIONREGURGITANT FRACTION • EF= (EDV-ESV) EDV • RF= SV angiographic – ESV forward) SV angiographic

  9. Left Ventricular Mass • Is assumed that wall thickness is uniform

  10. Wall Stress • σ= PR 2h • Meridional, radial and circunferencial. A and B: semi-axis

  11. REGIONAL LEFT VENTRICULAR WALL MOTION • Akinesis, dyskinesis, hypokinesis and hyperkinesis.

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