Pulmonary trunk to aortic ratio
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At the time the article was created Yuranga Weerakkody had no financial relationships to ineligible companies to disclose.
View Yuranga Weerakkody's current disclosuresAt the time the article was last revised Karen Machang'a had no financial relationships to ineligible companies to disclose.
View Karen Machang'a's current disclosures- Pulmonary trunk to aorta ratio
- MPA:AA ratio
- Main pulmonary artery (pulmonary trunk) to ascending aorta ratio
- Main pulmonary artery (pulmonary trunk) to ascending aorta ratio
- Pulmonary trunk to aortic ratio
The pulmonary trunk to aortic ratio (PA:A), also known as main pulmonary artery to aorta ratio (MPA:A), is a measurement that can be made on CT and MRI scans and, in some instances on echocardiography 3. In most instances, a normal ratio in adults is taken 1:1 or less, and with ratios greater than that suggests:
However, some studies state that it can be normal up to 1.09:1 in the pediatric population (with some reports suggesting the cut off ratio in children being closer to 1.3:1 8).
Measurement
It is usually measured on axial (ideally orthogonal) images just prior to the pulmonary artery bifurcation.
Quiz questions
References
- 1. Compton G, Florence J, MacDonald C, Yoo S, Humpl T, Manson D. Main Pulmonary Artery–to–Ascending Aorta Diameter Ratio in Healthy Children on MDCT. AJR Am J Roentgenol. 2015;205(6):1322-5. doi:10.2214/ajr.15.14301 - Pubmed
- 2. Iyer A, Wells J, Vishin S, Bhatt S, Wille K, Dransfield M. CT Scan-Measured Pulmonary Artery to Aorta Ratio and Echocardiography for Detecting Pulmonary Hypertension in Severe COPD. Chest. 2014;145(4):824-32. doi:10.1378/chest.13-1422 - Pubmed
- 3. Schneider M, Ran H, Pistritto A et al. Pulmonary Artery to Ascending Aorta Ratio by Echocardiography: A Strong Predictor for Presence and Severity of Pulmonary Hypertension. PLoS One. 2020;15(7):e0235716. doi:10.1371/journal.pone.0235716 - Pubmed
- 4. Natalie Terzikhan, Daniel Bos, Lies Lahousse et al. Pulmonary Artery to Aorta Ratio and Risk of All-Cause Mortality in the General Population: The Rotterdam Study. Eur Respir J. 2017;49(6):1602168. doi:10.1183/13993003.02168-2016 - Pubmed
- 5. Ortaç Ersoy E, Durusu Tanriover M, Öcal S, Gulsun Akpinar M, Topeli A. Measurement of Pulmonary Artery to Aorta Ratio in Computed Tomography is Correlated with Pulmonary Artery Pressure in Critically Ill Chronic Obstructive Pulmonary Disease Patients. J Crit Care. 2016;33:42-6. doi:10.1016/j.jcrc.2016.01.020 - Pubmed
- 6. Baldi B, Fernandes C, Heiden G et al. Association Between Pulmonary Artery to Aorta Diameter... : Medicine. LWW. 2021;100(25):e26483. doi:10.1097/MD.0000000000026483
- 7. Boehm P, Schwarz S, Thanner J et al. Larger Pulmonary Artery to Ascending Aorta Ratios Are Associated with Decreased Survival of Patients Undergoing Pulmonary Endarterectomy. JTCVS Open. 2022;10:62-72. doi:10.1016/j.xjon.2022.02.018
- 8. Caro-Domínguez P, Compton G, Humpl T, Manson D. Pulmonary Arterial Hypertension in Children: Diagnosis Using Ratio of Main Pulmonary Artery to Ascending Aorta Diameter as Determined by Multi-Detector Computed Tomography. Pediatr Radiol. 2016;46(10):1378-83. doi:10.1007/s00247-016-3636-5 - Pubmed
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