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Furosemide Response Index (FRI) Calculator
Furosemide Response Index (FRI): Explanation and Clinical Context The Furosemide Response Index (FRI) is a clinical tool designed to quantify the early response of patients with acute decompensated heart failure (ADHF) to intravenous loop diuretics. It is calculated as the urine output (mL/hour) divided by the administered loop diuretic dose (mg/day). FRI allows clinicians to identify patients with poor diuretic resp