Evaluation of renal function in dogs using pulsed Doppler ultrasonography

Area of Science:

• Veterinary Medicine
• Diagnostic Imaging
• Renal Physiology

Background:

• Assessing kidney function in humans often involves evaluating venous blood flow.
• Previous canine studies focused on arterial blood flow indices (RI, PI) for renal function prediction.
• Renal venous blood flow velocity in dogs has not been previously studied.

Purpose of the Study:

• To explore the connection between renal venous blood flow velocity and overall renal function in dogs.

Main Methods:

• Ten healthy beagle dogs were assessed for blood parameters and glomerular filtration rate (GFR).
• Pulsed Doppler ultrasonography was used to measure renal and interlobular vein velocities (Vmax, Vmin) and venous impedance index.
• Renal and interlobular artery resistive index (RI) and pulsatility index (PI) were also calculated.

Main Results:

• Maximum (Vmax) and minimum (Vmin) renal vein flow velocities showed a negative correlation with GFR in both kidneys.
• No significant correlations were observed between other measured parameters and GFR.
• These findings indicate a relationship between GFR and renal venous blood flow velocity.

Conclusions:

• Doppler ultrasonography of renal venous blood flow shows promise for detecting renal venous abnormalities and congestion in dogs.
• Further extensive research, including comparisons with dogs suffering from renal impairment, is necessary to confirm these findings.