Ultrasound measurement of perirenal adipose tissue indicates cardiovascular disease, but standardisation is needed: A systematic review

Introduction

In both highly industrialised and developing countries, obesity is reaching epidemic proportions and increasingly becoming a critical indicator of general morbidity, cardiovascular disease (CVD) and renal dysfunction. A promising trend in detection and management of obesity is the measurement of perirenal adipose tissue (PRAT), increasingly recognised as a metabolically active endocrine organ in itself. Its measurement by ultrasound is used increasingly to indicate visceral obesity and its clinical management. This review synthesises current techniques for measuring PRAT and its potential use as an indicator of CVD.

Methods

We included clinical studies published between 2010 and 2023, investigating the current practice and use of specific ultrasonographic techniques and assessed the reliability and accuracy of included papers. The risk of bias was assessed using the Downs and Black Checklist, and the methodological quality examined using the Grade of Recommendations, Assessments, Development and Evaluation.

Results

It found, PRAT measures are predictive of CVD risk factors and the accuracy of ultrasound is comparable to CT and MRI, but there is no consistency in ultrasound technique. The lack of any randomised control trials and the use of 20 different non-standardised ultrasound techniques across the 21 studies resulted in inconsistent and imprecise clinical observations and interpretations, which decreased the overall quality of the studies.

Conclusion

This review found the inclusion of ultrasound measures in routine abdominal imaging potentially invaluable but demonstrates the need for standardisation of the perirenal fat ultrasound measuring technique to improve reproducibility and reliability.