❤️ Aortic Valve Area (Hakki / Continuity)
UseWhen to use: bedside echo AS severity adjunct when CO/gradients or LVOT–AV VTIs are available.
StrataTeaching bands often use <1.0 cm² severe, 1.0–1.5 moderate — always integrate mean gradient and flow state.
LimitsWhen not to use: replacing multimodal AS staging. · Pitfall: LVOT diameter measurement error (squared). · Not a TAVR/SAVR sole decision.
SourceHakki simplified AVA; continuity-equation AVA teaching formulas
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
Hakki or continuity.
When to use
When to use: bedside echo AS severity adjunct when CO/gradients or LVOT–AV VTIs are available.
How it works
Hakki: AVA = CO / √peak ΔP; Continuity: AVA = π(D/2)² × VTI_LVOT / VTI_Ao.
Key points
- Hakki or continuity.
- Flow-state matters.
- Next: mean gradient / DI / heart team.
References
- Hakki simplified AVA; continuity-equation AVA teaching formulas
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Method | Hakki: CO / √peak gradient |
|---|---|
| Cardiac output | 5.0 L/min |
| Peak AV gradient | 64 mmHg |
| LVOT diameter | 2.0 cm |
| LVOT VTI | 20 cm |
| Aortic valve VTI | 80 cm |
→AVA (Hakki)0.63cm²
- Formula：CO / √ΔP
- Cue：<1.0 cm² — severe AS teaching band (context-dependent)
| Method | Continuity: CSA×VTI_LVOT / VTI_Ao |
|---|---|
| Cardiac output | 5.0 L/min |
| Peak AV gradient | 64 mmHg |
| LVOT diameter | 2.0 cm |
| LVOT VTI | 20 cm |
| Aortic valve VTI | 80 cm |
→AVA (continuity)0.79cm²
- CSA_LVOT：3.14 cm²
- DI (VTI ratio)：0.25
- Cue：<1.0 cm² — severe AS teaching band (context-dependent)
Verification & sources · governance
FAQ
Frequently asked questions
- Does Aortic Valve Area (Hakki / Continuity) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Aortic Valve Area (Hakki / Continuity) calculated in practice? Can you show a worked example?
- Inputs: Method Hakki: CO / √peak gradient, Cardiac output 5.0 L/min, Peak AV gradient 64 mmHg, LVOT diameter 2.0 cm, LVOT VTI 20 cm, Aortic valve VTI 80 cm → Result: AVA (Hakki) 0.63 cm²（Formula: CO / √ΔP, Cue: <1.0 cm² — severe AS teaching band (context-dependent)） Inputs: Method Continuity: CSA×VTI_LVOT / VTI_Ao, Cardiac output 5.0 L/min, Peak AV gradient 64 mmHg, LVOT diameter 2.0 cm, LVOT VTI 20 cm, Aortic valve VTI 80 cm → Result: AVA (continuity) 0.79 cm²（CSA_LVOT: 3.14 cm², DI (VTI ratio): 0.25, Cue: <1.0 cm² — severe AS teaching band (context-dependent)）