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Exam (elaborations)

Formulas for echocardiography

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  • Course
  • Echocardiography
  • Institution
  • Echocardiography

= (SV/EDV) · 100% Correct Answer-EF% (LVEDD - LVESD / LVEDD) x 100 Correct Answer-FS % = EDV - ESV Correct Answer-SV = SV · HR Correct Answer-CO CO/BSA Correct Answer-Cardiac index or CI diameter² x 0.78540 Correct Answer-CSA CSA₁ · VTI₁ = CSA₂ · VTI₂ Correct Answer-C...

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  • August 17, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Echocardiography
  • Echocardiography
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Formulas for echocardiography
= (SV/EDV) · 100% Correct Answer-EF%


(LVEDD - LVESD / LVEDD) x 100 Correct Answer-FS %


= EDV - ESV Correct Answer-SV


= SV · HR Correct Answer-CO


CO/BSA Correct Answer-Cardiac index or CI


diameter² x 0.78540 Correct Answer-CSA


CSA₁ · VTI₁ = CSA₂ · VTI₂ Correct Answer-Continuity Equation


CSA₁ · VTI₁/VTI₂ or LVOT diameter² x 0.78540 x LVOT VTI/AV VTI
Correct Answer-AVA (or CSA₂) using the continuity equation


Cardiac Output / (Heart Rate x Systolic Ejection Period x 44.3 x √Mean
Gradient) Correct Answer-AVA using the Gorlin equation


LVOT Area x (LVOT VTI / Mitral valve VTI) Correct Answer-MVA
using the continuity equation

, 0.85 x AVA Correct Answer-MVA using the Gorlin equation


759/DT Correct Answer-MVA using MV decel time


220/PHT Correct Answer-MVA using MV pressure half-time


[ 2 x π x r2 x VA x (α/180) ] / Vmax Correct Answer-MVA using the
MR PISA


∆P = 4(v₂² - v₁²) Correct Answer-Bernoulli's Equation


∆P = 4(v₂²) Correct Answer-Simplified Bernoulli's Equation
to calculate pressure gradient (PG)


= VTI(LVOT) / VTI(AV) Correct Answer-Dimensionless severity index
(DSI)


= systolic BP - 4(max v of MR)² Correct Answer-Left atrial pressure
(LAP)


4 x (peak PFO (or ASD) velocity²) + RAP Correct Answer-LAP in the
presence of a PFO ASD


= ERO (cm²) · TVI of MR (cm) Correct Answer-Regurgitant Volume of
MR (cc)

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