iGuyton: Venous Return

iGuyton estimates the analogue of mean systemic filling pressure (Pmsa), the pressure gradient for venous return (Pvr) and heart efficiency (Eh) from six values you already have at the bedside: central venous pressure, mean arterial pressure, cardiac output, age, height and weight. No inspiratory holds, no circulatory arrest, no extra equipment.

FREE
• Bedside calculator (Parkin and Leaning, J Clin Monit Comput 2008): Pmsa, Pvr and Eh.
• Results update as you type, with checks on impossible values.
• "How to measure" guide with diagrams of the Guyton curves and of the effect of fluids and inotropes.

IGUYTON PREMIUM
• Guyton diagram: venous return line reaching zero flow at Pmsa, the operating point (CVP, cardiac output) and a schematic cardiac function curve; resistance to venous return (RVR), body surface area and the c coefficient.
• 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 Pmsa, Pvr and Eh 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
iGuyton Premium is an auto-renewing yearly subscription with a 7-day free trial for new subscribers. Payment is charged to your Apple Account at confirmation of purchase after the trial. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel it in your account settings.
Terms of Use (Apple standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://iguyton.sonable.app/privacy-app.html

FOR HEALTHCARE PROFESSIONALS
iGuyton 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.