Ultrasound Measurement of IVC Diameter and Collapsibility Index in Correlation with Central Venous Pressure in Critically Ill Patient

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Background: Accurate evaluation of intravascular volume status is essential in critically diseased cases. Although central venous pressure (CVP) is a common invasive indicator, ultrasound evaluation of the inferior vena cava (IVC) may offer a non-invasive alternative. Objective: To assess the association among ultrasound-derived IVC diameter and collapsibility index (IVC-CI) with CVP critically diseased cases. Methods: This prospective observational research involved 80 adult ICU cases had a central venous catheter inserted for clinical CVP monitoring. Ultrasound measurements of IVC minimum and maximum diameters have been taken, and IVC-CI was calculated. Patients were grouped based on CVP levels: Group I (<7 cmH₂O), Group II (7–12 cmH₂O), and Group III (>12 cmH₂O). Correlations between CVP and IVC parameters were analyzed. Results: The mean age was 51.2 ± 14.5 years; 47.5% were male. Sepsis was the most frequent diagnosis (30%). Mean IVCmax and IVCmin were 3.1 ± 0.5 cm and 2.34 ± 0.5 cm, respectively; mean IVC-CI was 23.8 ± 11.7%. CVP positively associated with IVCmax (r equal 0.978) and IVCmin (r equal 0.962), and negatively with IVC-CI (r equal -0.968) and heart rate (r equal -0.993) (all p below 0.001). Statistically significant variances have been observed among CVP groups in ABP, HR, IV Cmin, and IVC-CI. Conclusion: Ultrasound measurement of IVC diameter and CI correlates strongly with CVP, supporting its use as a reliable, non-invasive instrument for assessing volume status in critically diseased cases.

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