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Blood Velocity Variation in Right Renal and Superior Mesenteric Arteries During Cardio-pulmonary Bypass

NCT06009809 · Status: RECRUITING · Type: OBSERVATIONAL · Enrollment: 92

Last updated 2025-12-01

No results posted yet for this study

Summary

The cardiopulmonary by-pass technique, used in cardiac surgery to obtain a bloodless operating field and an immobile heart, determines important effects on the blood vessel wall, especially when a continuous and non-continuous blood flow is used. In fact, a reduction in Nitric Oxide (NO) production by the endothelium, an increase in systemic vascular resistance and an increased risk of cerebral and renal hypoperfusion have been observed and can result in potential organ damage. Acute kidney injury (AKI) after heart surgery is a major cause of mortality and morbidity. Its incidence varies according to different definitions, but can reach 30%. In some series, 1-5% of patients require renal replacement therapy in the postoperative period presenting a mortality that can reach 50-70%. However, even more limited increases in serum creatinine are associated with worsening prognosis and the risk of chronic kidney disease. The pathophysiology of AKI in cardiac surgery is complex and still partly unknown.Recently a technique has been described that allows to measure the blood velocity in the right renal artery and in the superior mesenteric artery using the transesophageal echocardiogram (TEE); this technique allows to view these arteries and measure the speed of the blood with good precision because the insonation angle (ie the angle formed by the ultrasound flow and the direction of the blood vessel) is adequate. In cardiac surgery, this methodology allows you to monitor blood velocity in the right renal artery and superior mesenteric artery during surgery. Some authors have used it to conduct pilot studies in which the blood velocity values in the renal arteries during cardiac surgery were used to calculate the pulsatility and resistivity indices, as predictors of the risk of postoperative AKI. At present, therefore, despite the fact that TEE is routinely used for monitoring renal perfusion during cardiac surgery, the blood velocity in the renal and mesenteric arteries has been little studied during cardiopulmonary by-pass (CPB) and has never been evaluated during CPB with continuous flow; in particular, the possible variation in blood velocity measured during CPB compared to the baseline values measured before extracorporeal circulation and its correlation with the onset of postoperative renal failure is not known.

Conditions

  • Heart Surgical Procedure

Interventions

DIAGNOSTIC_TEST

transesophageal echocardiogram

To measure mean blood velocity at the level of the right renal and superior mesenteric artery

Sponsors & Collaborators

  • Fondazione Policlinico Universitario Agostino Gemelli IRCCS

    lead OTHER

Principal Investigators

  • Cavaliere Franco, M.D. · Fondazione Policlinico Agostino Gemelli IRRCS

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2022-02-15
Primary Completion
2025-12-31
Completion
2025-12-31

Countries

  • Italy

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT06009809 on ClinicalTrials.gov