Venous Excess and Lung Ultrasound During Continuous Kidney Replacement Therapy in Critically Ill Patients

Not yet recruiting

• Conditions: Acute Kidney Failure Stage 3
• Interventions: Diagnostic Test: VexLUS (venous excess lung ultrasound)

• Registration Number: NCT06254703
• Lead Sponsor: Chulalongkorn University

Brief Summary

Hemodynamic management of critically ill patients has long been focused on the arterial side of the vasculature by assessing adequate perfusion pressure. However, the venous pressure is also of critical importance. Venous congestion can occur in patients with right ventricular failure, pulmonary hypertension or fluid overload. Fluid overload has harmful effects to end organs causing acute kidney injury (AKI), lung edema, multiorgan dysfunction and death. Vice versa, AKI can aggravate fluid retention and inflammation. The measurement of venous pressure usually relies on central venous pressure (CVP) and inferior vena cava diameter (IVC). However, CVP measurement has been associated with measurement errors and has low accuracy in predicting fluid responsiveness. Moreover, IVC collapsibility or distensibility is a static parameter and is associated with subjective variability.

Multiorgan Point-of-Care ultrasound (POCUS) can enhance the management of AKI by enabling the evaluation of renal structural abnormalities and hemodynamic status . POCUS allows the clinician to assess intravascular and pulmonary fluid overload. It has been shown that POCUS is a good parameter to predict global fluid status of the patient .

Venous Excess Ultrasound (VEXUS) consists of the evaluation of IVC, hepatic vein, portal vein and intrarenal vein flow pattern. Previous studies showed significant correlation between VExUS score with RRT-free days and guide fluid management in critically ill patients with AKI . VExUS is useful in predicting patients at risk to develop AKI post cardiac surgery . Adding modified lung ultrasound score to the VExUS protocol could help clinician to adjust fluid administration and achieve proper fluid balance during continuous kidney replacement therapy (CKRT). However, the role of using combined VExUS and lung ultrasound in the assessment and guidance of fluid management during CKRT is unknown.

Detailed Description

Lung and cardiac ultrasonography can augment the definite diagnosis of volume overload. Thoracic ultrasound demonstrating B-lines which suggest thickened interstitial or fluid filled alveoli or increased vena cava diameter by ultrasound can also be used to assess volume status.

Recently, the venous excess ultrasound grading system (VExUS) has been introduced to be used in conjunction with POCUS to assess significant congestion. This technique was developed by Beaubien-Souligue in order to classify the level of venous congestion by assessing the abdominal blood flow, including hepatic veins (HVs), portal veins (PVs) and intrarenal veins (IRVs). Abnormal patterns of flow in these organs can enhance the clinical evaluation of venous congestion in addition to Inferior vena cava (IVC) ultrasound since organ dysfunction occurring with venous congestion can also be from the transmission of pressure from right atrium (right atrial pressure, RAP) to the peripheral organ. Venous congestion is classified into four grades , ranging from grade 0 (no congestion) to the most severe form, grade 3 (severe congestion) or VExUS "A" through "E" Lung ultrasound and AKI Volume overload is associated with interstitial edema which increases the diffusion distance for oxygen and induces an increase in interstitial fluid pressure, impairing capillary blood flow and exacerbating organ dysfunction . A prospective pilot observational study with 45 adult patients with AKI at any time during ICU stay employed the FALLS (Fluid Administration Limited by Lung Ultrasound) protocol in which they use the LUS for assessing volume status. A new onset of the B-lines was considered as the endpoint of fluid administration. The study demonstrated a linear correlation between baseline B-line scores and PaO2/FiO2 ratio in ICU patients VExUS and lung ultrasound during CKRT

Previous studies have shown that VExUS and lung ultrasound may play a role in predicting AKI severity and may aid fluid de-escalation in critically ill patients. However, no studies have evaluated the role of both VExUS and lung ultrasound in guiding fluid management during CKRT. Our research aims to evaluate the prevalence of venous congestion by VExUS and lung ultrasound (VExLUS) during CKRT and its association with clinical outcomes.

Study Timeline

• Study First Submitted: 2024-01-28
• Status Verified: 2024-02
• Study First Submitted QC: 2024-02-04
• Last Update Submitted: 2024-02-04
• Study First Posted: 2024-02-12
• Last Update Posted: 2024-02-12
• Study Start: 2024-03-01
• Primary Completion: 2025-12-31
• Study Completion: 2026-06-30

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 209

Inclusion Criteria

1. Adults (≥ 18 years of age)
2. Admitted to ICU
3. Plan to initiate CKRT by clinician's judgement

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Exclusion Criteria

1. Refuse to participate
2. Previous diagnosis of end-stage kidney disease (ESKD) currently on kidney replacement therapy
3. Kidney tran splant recipient
4. Receive KRT before ICU admission
5. Structural kidney diseases which will interfere with intrarenal doppler ultrasound e.g. renal artery stenosis, autosomal dominant polycystic kidney disease etc.
6. Patients with previously known conditions that interfere with portal doppler assessment, namely liver cirrhosis, severe tricuspid regurgitation with structural heart disease or massive ascites.
7. Underlying disease process with a life expectancy less than 90 days
8. Pregnancy
9. Concomitant severe respiratory distress syndrome
10. Expected life expectancy <48 hours
11. Receiving extracorporeal membrane oxygenation (ECMO)

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Patients receiving CKRT	VexLUS (venous excess lung ultrasound)	1. Adults (≥ 18 years of age) 2. Admitted to ICU 3. Plan to initiate CKRT by clinician's judgement

Primary Outcome Measures

Name	Time	Method
To assess the prevalence of venous congestion by using VExLUS in patients who receive CKRT	1 day	prevalence of venous congestion

Secondary Outcome Measures

Name	Time	Method
To evaluate the association between VExLUS scores and all-cause mortality within 90 days, KRT-free days, ventilator-free days, vasopressor-free days, ICU-free days, dialysis dependence ay 28 days and 90 days	up to 90 days	clinical outcomes
- to assess the correlation of VExLUS score with bioelectrical impedance vector analysis (BIVA) parameters and biomarkers	1 day	Correlation to BIVA
to evaluate inter-observer variability in determining VExLUS	3 days	inter-observer variability
To evaluate the association between VExLUS scores and all-cause mortality within 28 days	28 days	28 days all cause mortality

Trial Locations

Locations (1)

King chula memorial hospital; 🇹🇭 Bangkok, Thailand