iElastance

iElastance estimates left ventricular end-systolic elastance (Ees), effective arterial elastance (Ea) and their ratio, ventricular–arterial coupling (VAC), from six values you already have at the bedside: cuff pressures, a standard echocardiogram and two systolic time intervals. No catheter, no extra equipment.

FREE
• Single-beat calculator (Chen et al., J Am Coll Cardiol 2001): systolic and diastolic pressure, ejection fraction, stroke volume, pre-ejection and total ejection time.
• Results update as you type, with checks on impossible values.
• "How to measure" guide with diagrams of the method of disks and of systolic times on the LVOT pulsed Doppler.

IELASTANCE PREMIUM
• Pressure–volume diagram: ESPVR and Ea lines, stroke volume, ESP, EDV, ESV and V0.
• Cases: keep your 10 most recent cases, each with as many measurements as you need (baseline, after fluids, after a vasopressor or inotrope…).
• Trends of VAC, Ea and Ees over time.
• PDF report with results, diagrams, measurement table, trends, method and reference, ready to print or share.
• Archive export and import to move your cases to another device.

PRIVATE BY DESIGN
No account, no analytics, no advertising. Cases and reports stay on your device.

SUBSCRIPTION
iElastance Premium is an auto-renewing yearly subscription with a 7-day free trial for new subscribers, billed through Google Play. It renews automatically unless cancelled before the end of the current period; manage or cancel it in Google Play › Payments & subscriptions.
Privacy Policy: https://ielastance.sonable.app/privacy-app.html

FOR HEALTHCARE PROFESSIONALS
iElastance is intended for physicians and healthcare professionals in intensive care, anaesthesia and cardiology. Results are estimates from a published model and support, never replace, clinical judgement. It does not provide diagnoses or treatment recommendations.

Recent changes:
iElastance 5 is a complete redesign: live single-beat results, the pressure–volume diagram, cases followed over time with trends, PDF reports, a new measurement guide and dark mode. The calculator stays free; iElastance Premium unlocks diagrams, cases and reports with a 7-day free trial.