Furosemide Therapy Guided by a Non‑Collapsing Inferior Vena Cava

IVC as a Marker of Volume Overload

A dilated, non‑collapsible inferior vena cava (IVC > 2 cm with <20 % inspiratory collapse) reflects elevated right‑atrial pressure (>12 mmHg) and is associated with right‑ventricular dysfunction, volume overload, or pulmonary hypertension, all of which benefit from diuretic therapy. 2
The presence of a non‑collapsible IVC independently predicts higher rates of readmission after heart‑failure hospitalization and an increased mortality risk (hazard ratio ≈ 1.4) after adjustment for ventricular function and comorbidities. 1

Furosemide is indicated when systolic blood pressure is ≥ 90–100 mmHg; lower pressures increase the risk of hypoperfusion and cardiogenic shock. 1
Severe hyponatraemia (serum sodium < 120–125 mmol/L) is an absolute contraindication to furosemide administration. 1
Clinical evidence of marked hypovolaemia (e.g., hypotension, tachycardia, poor skin turgor) must be excluded even if the IVC appears dilated. 1
Anuria (absence of urine output) precludes the use of furosemide. 1

For diuretic‑naïve patients or acute presentations, give an intravenous bolus of furosemide 20–40 mg over 1–2 minutes. 1
In patients already receiving chronic oral diuretics, administer at least the equivalent intravenous dose, or consider doubling the dose for acute decompensation. 1

Insert a bladder catheter and record urine output hourly; aim for a minimum output of > 0.5 mL kg⁻¹ h⁻¹. 1
Re‑evaluate the IVC 2–4 hours after the initial furosemide dose to assess reduction in diameter and improvement in collapsibility, guiding further therapy. (Monitoring protocol derived from guideline recommendations.)

Do not rely on IVC findings alone; combine IVC assessment with physical examination, natriuretic‑peptide levels, and additional echocardiographic parameters (e.g., E/E′ ratio, left‑atrial volume) to confirm volume status. 1
Avoid using furosemide solely to “improve hemodynamics” in hypotensive patients, as its venodilatory effect can worsen tissue perfusion when blood pressure is already low. 1