ABC-AF Bleeding Score ABC-AF Stroke Score ABCD2 Score ADD-RS Aortic Valve Calcium Score APPLE Score ASCVD (Pooled Cohort)AVA (Continuity Equation)BAG-AHF Score Biplane Simpson EF Blood Pressure Percentiles Brugada Criteria (VT vs SVT)Cardiac Output Index CHA2DS2-VASc CHADS2 Cornell Voltage Criteria CRUSADE Bleeding Score DAPT Score DASI Duke Treadmill Score E/A Ratio EDACS Score EHMRG EHRA Score Embolic Risk Score EROA (PISA Method)FFR (Fractional Flow Reserve)Fick Cardiac Output Framingham 10-Year Risk Friedewald LDL Equation Gorlin Equation GRACE Score Gupta MICA (NSQIP)GWTG-HF Score H2FPEF Score Hakki Formula HAS-BLED HEART Pathway HEART Score HEMORR2HAGES hs-Troponin 0h/1h ESC Algorithm iFR INTERCHEST Score Killip Classification Lee's RCRI LV Mass Index LV Stroke Work Index MAGGIC Risk Score MAP Calculator Martin/Hopkins LDL Modified Duke Criteria Modified Sgarbossa Criteria MVA (Pressure Half-Time)Non-HDL Cholesterol NT-proBNP Age-Adjusted Thresholds ORBIT Score Ottawa Heart Failure Risk PREVENT Equations Pulse Pressure PVR Calculator PVR Index QRISK3 QTc (Bazett)QTc (Fridericia)REVEAL 2.0 Score REVEAL Lite 2 Reynolds Risk Score ROSI RVSP Calculator Schwartz Score (LQTS)SCORE2 Seattle Heart Failure Model (SHFM)Sgarbossa Criteria Shock Index Sokolow-Lyon Voltage Stroke Volume Index SVR Calculator SYNTAX Score SYNTAX Score II TAPSE Teichholz Formula TIMI (STEMI)TIMI (UA/NSTEMI)Troponin Delta Calculator Valvular Gradients Vancouver Chest Pain Rule Vereckei Algorithm WATCHDM Score Wilkins Score Wood Units Calculator

Recent Journal Updates

JAMAJun 2, 2026

Kratom Use and Severe Health Outcomes Surge in the US

Clinical Context

We think this has broad domain relevance to Aortic Valve Area (Continuity Equation).

Clinical Pharmacology TherapeuticsMay 29, 2026

Partial Differential Equation (PDE)‐Based Spatial Pharmacometrics in NONMEM: Method of Lines (MOL) Implementation with AI‐Assisted Model Development

Clinical Context

We think this might be relevant to the clinical guidance for Aortic Valve Area (Continuity Equation).

DiabetologiaMay 26, 2026

Clinical and psychological phenotypes of type 1 diabetes and disordered eating derived from a case vignette series: T1DE phenotypes

Clinical Context

We think this has broad domain relevance to Aortic Valve Area (Continuity Equation).

AVA (Continuity Equation)

AVA (Continuity Equation): Calculates aortic valve area from Doppler echocardiography to assess aortic stenosis severity.

Doppler & Valve Measurements

LVOT Diameter (measured at base in systole)

LVOT VTI (from pulsed-wave Doppler)

Aortic Valve VTI (from continuous-wave Doppler)

Body Surface Area (for indexing)

Formula

AVA = (π/4 × LVOT d2) × (VTI_LVOT / VTI_AV)

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Quantification of aortic stenosis severity on TTE/TEE

Decision-making for AVR vs. conservative management

Diagnostic workup of murmurs

Serial assessment of severe AS progression

Discordant gradient/area findings (low-flow states)

Key Points

Recommended by ACC/AHA and ESC guidelines as gold standard for AS quantification

More reliable than simpler planimetered area in off-axis imaging

Critical in low-gradient AS scenarios for true area determination

Requires good image quality (LVOT visualization + aortic valve alignment)

Last Comprehensive Review: 2026

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Quantification of aortic stenosis severity on TTE/TEE

Decision-making for AVR vs. conservative management

Diagnostic workup of murmurs

Serial assessment of severe AS progression

Discordant gradient/area findings (low-flow states)

Key Points

Recommended by ACC/AHA and ESC guidelines as gold standard for AS quantification

More reliable than simpler planimetered area in off-axis imaging

Critical in low-gradient AS scenarios for true area determination

Requires good image quality (LVOT visualization + aortic valve alignment)

Last Comprehensive Review: 2026

Related Cardiovascular Tools

hs-Troponin 0h/1h ESC Algorithm

Cardiovascular Calculators Critical Care Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.

Recent Journal Updates

JAMAJun 2, 2026

Kratom Use and Severe Health Outcomes Surge in the US

Clinical Context

We think this has broad domain relevance to Aortic Valve Area (Continuity Equation).

Clinical Pharmacology TherapeuticsMay 29, 2026

Partial Differential Equation (PDE)‐Based Spatial Pharmacometrics in NONMEM: Method of Lines (MOL) Implementation with AI‐Assisted Model Development

Clinical Context

We think this might be relevant to the clinical guidance for Aortic Valve Area (Continuity Equation).

DiabetologiaMay 26, 2026

Clinical and psychological phenotypes of type 1 diabetes and disordered eating derived from a case vignette series: T1DE phenotypes

Clinical Context

We think this has broad domain relevance to Aortic Valve Area (Continuity Equation).

AVA (Continuity Equation)

AVA (Continuity Equation): Calculates aortic valve area from Doppler echocardiography to assess aortic stenosis severity.

Doppler & Valve Measurements

LVOT Diameter (measured at base in systole)

LVOT VTI (from pulsed-wave Doppler)

Aortic Valve VTI (from continuous-wave Doppler)

Body Surface Area (for indexing)

Formula

AVA = (π/4 × LVOT d2) × (VTI_LVOT / VTI_AV)

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Quantification of aortic stenosis severity on TTE/TEE

Decision-making for AVR vs. conservative management

Diagnostic workup of murmurs

Serial assessment of severe AS progression

Discordant gradient/area findings (low-flow states)

Key Points

Recommended by ACC/AHA and ESC guidelines as gold standard for AS quantification

More reliable than simpler planimetered area in off-axis imaging

Critical in low-gradient AS scenarios for true area determination

Requires good image quality (LVOT visualization + aortic valve alignment)

Last Comprehensive Review: 2026

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Quantification of aortic stenosis severity on TTE/TEE

Decision-making for AVR vs. conservative management

Diagnostic workup of murmurs

Serial assessment of severe AS progression

Discordant gradient/area findings (low-flow states)

Key Points

Recommended by ACC/AHA and ESC guidelines as gold standard for AS quantification

More reliable than simpler planimetered area in off-axis imaging

Critical in low-gradient AS scenarios for true area determination

Requires good image quality (LVOT visualization + aortic valve alignment)

Last Comprehensive Review: 2026

Related Cardiovascular Tools

hs-Troponin 0h/1h ESC Algorithm

Cardiovascular Calculators Critical Care Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.