Acute Kidney Injury After Cardiac Surgery: Novel Ultrasound Techniques for Prediction of Acute Kidney Injury

Acute Kidney Injury Clinical Trial

Official title:

Acute Kidney Injury After Cardiac Surgery: Novel Ultrasound Techniques for Prediction of Acute Kidney Injury

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03727204
• Other study ID #: 1-10-72-267-18
• Status: Completed
• Start date: October 15, 2018
• Est. completion date: March 31, 2020

Study information

• Verified date: April 2021
• Source: Aarhus University Hospital
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational [Patient Registry]

Clinical Trial Summary

Acute Kidney Injury (AKI) is a frequent and important complication to cardiac surgery. This study will evaluate the diagnostic ability of ultrasonographic measures of blood flow in kidneys and liver in predicting AKI after cardiac surgery.

Description:

Acute Kidney Injury (AKI) is a frequent and important complication to cardiac surgery. The pathophysiology is multifactorial, but renal functions in this setting is determined by a complex interplay between renal perfusion, fluid status, cardiac output, mean arterial pressure and back pressure to venous outflow.

Renal perfusion may be quantified with novel ultrasound techniques. Ultrasonography of the kidney and renal vasculature allows for assessment of renal afferent flow and renal venous flow and, together with venous flow patterns of the portal vein and liver veins, may identify patients in risk of AKI.

The study is observational and will describe the diagnostic accuracy of the ultrasound measures in predicting postoperative AKI. Patients will be examined with ultrasound of kidney and liver flow along with echocardiography on on the day before surgery and on the 1st and 4th. In addition, patients are followed with markers of kidney function, fluid balance and invasive measures of mean arterial pressure and central venous pressure.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 150
• Est. completion date: March 31, 2020
• Est. primary completion date: March 31, 2020
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• All patients = 18 years

• Scheduled for on-pump cardiac surgery

• Oral and written consent

AND

• 1 of the following risk factors for development of postoperative AKI may be included:

• age > 70 years;

• NYHA (New York Heart Association) 3+4;

• Insulin dependent diabetes;

• Glomerular filtration rate < 60 ml/min/1,73 m2;

• Ejection fraction < 35;

• Surgery:

• Combined CABG and valve surgery;

• Any valve surgery except isolated aortic-valve surgery;

• Redo surgery;

• Endocarditis;

• Peripheral vascular disease.

Exclusion Criteria:

• Insufficient ultrasonographic imaging of the kidneys;

• Known morphological kidney disease;

• Preoperative dialysis;

• Prior participation in the study.

Related Conditions & MeSH terms

• Acute Kidney Injury
• Acute Renal Failure
• Cardiac Surgery
• Wounds and Injuries

Intervention

Procedure:
• On-pump cardiac surgery
All participants will undergo on-pump cardiac surgery

Locations

Country	Name	City	State
Denmark	Aarhus University Hospital, Department of Anaesthesiology	Aarhus
South Africa	Department of Anesthesiology, Charlotte Maxeke Johannesburg Academic Hospital, University of the Witwatersrand	Johannesburg

Sponsors (2)

Lead Sponsor	Collaborator
Aarhus University Hospital	University of Aarhus

Countries where clinical trial is conducted

Denmark,  South Africa, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	The association between the kidney venous ultrasonography flow pattern category on the 1st postoperative day and acute kidney injury (AKI) on the 4th postoperative day.	The flow pattern is grouped as either continuous, biphasic or monophasic based on the appearance.The final analysis will possibly include other flow categories.; AKI is defined by the 2012 Kidney Disease: Improving Global Outcomes (KDIGO) criteria and graded in four stages from no AKI to stage 1-3 AKI based on serum creatinin change and/or changes in urine output, with stage 3 being the worst stage.	4 days
Secondary	Correlation between changes in organ-specific flow measurements and the corresponding biomarkers.	Correlations between organ-specific ultrasonography flow measurements and the corresponding biomarkers of kidneys, liver and heart function, for both absolute values of organ-specific flow and perioperative changes in organ-specific flow	1 month
Secondary	Establishment of the most optimal organ specific cut-off values and the development of AKI.	Establishment of the most optimal cut-off (threshold) values for; absolute ultrasonography flow values for respectively kidney arterial flow; kidney venous flow; liver vein flow; portal vein flow and the risk of development of AKI.; changes in ultrasonography flow values for respectively kidney arterial flow; kidney venous flow; liver vein flow; portal vein flow and the risk of development of AKI.	1 month
Secondary	Fluid balance and AKI	Correlations between accumulated fluid balance on the 1st postoperative day and the development of AKI on the 4th postoperative day.	1 month
Secondary	Diastolic dysfunction and AKI	Correlations between echocardiographic measures of diastolic dysfunction and AKI. The measures include mitral inflow (E and A), mitral annular motion, medial and lateral (e' and a'), and measures define grades of diastolic dysfunction from normal to grade I-III, with grade III being the worst.	1 month
Secondary	Organ-specific flow measures and mortality	Correlation between organ-specific ultrasonography flow measurements on the day before surgery, the 1st and 4th postoperative day and the mortality at the 1st, 4th and 28th postoperative day.	1 month
Secondary	Organ-specific flow measures and and time of stay in ICU and hospital	Correlation between organ-specific ultrasonography flow measurements on the day before surgery, the 1st and 4th postoperative day and the duration of intensive care stay and duration of hospital stay.	1 month