Peritoneal to abdominal height ratio (PAR)

Last revised by Craig Hacking on 28 Sep 2023

Citation, DOI, disclosures and article data

Citation:

Ambros R, Hacking C, Yap J, et al. Peritoneal to abdominal height ratio (PAR). Reference article, Radiopaedia.org (Accessed on 18 Apr 2024) https://doi.org/10.53347/rID-85086

DOI:

https://doi.org/10.53347/rID-85086

Permalink:

https://radiopaedia.org/articles/85086

rID:

85086

Article created:

13 Dec 2020, Raphael Ambros ◉

Disclosures:

At the time the article was created Raphael Ambros had no recorded disclosures.

View Raphael Ambros's current disclosures

Last revised:

28 Sep 2023, Craig Hacking ◉ ◈

Disclosures:

At the time the article was last revised Craig Hacking had the following disclosures:

Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)

These were assessed during peer review and were determined to not be relevant to the changes that were made.

View Craig Hacking's current disclosures

Revisions:

5 times, by 4 contributors - see full revision history and disclosures

Systems:

Gastrointestinal

Sections:

Signs

Tags:

peritoneal to abdominal height ratio, par

Peritoneal to abdominal height ratio (PAR) ≥0.52 is a statistically associated sign for raised intra-abdominal pressure >12 mmHg in the context of abdominal compartment syndrome in critically ill patients in CT.

It can be calculated by dividing the distance from the linea alba to the posterior aspect of the duodenum (the anteroposterior peritoneal compartment diameter) by the distance from the linea alba to the posterior fascia excluding the subcutaneous fat (the anteroposterior abdominal diameter) measured in the midline on axial CT. A ratio equal to or greater than 0.52 and a corresponding clinical context should raise the suspicion for raised intra-abdominal pressure ¹.