Isovolumic Relaxation Time IVRT Grading

Grade diastolic dysfunction using isovolumic relaxation time (IVRT). Normal IVRT 70-90ms; prolonged IVRT >100ms indicates impaired relaxation; shortened IVRT <60ms indicates elevated filling pressures.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Grade diastolic dysfunction using isovolumic relaxation time (IVRT). Normal IVRT 70-90ms; prolonged IVRT >100ms indicates impaired relaxation; shortened IVRT <60ms indicates elevated filling pressures

Each component has a specific meaning:

  • Isovolumic relaxation time — The isovolumic relaxation time recorded for the scenario being assessed.

Note: Interpret the ivrt diastolic grading result against the thresholds and context described above.

How to Use

Enter the isovolumic relaxation time for the scenario you are assessing. Grade diastolic dysfunction using isovolumic relaxation time (IVRT). Normal IVRT 70-90ms; prolonged IVRT >100ms indicates impaired relaxation; shortened IVRT <60ms indicates elevated filling pressures. Use the ivrt diastolic grading result to inform your calculation.

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Frequently Asked Questions