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Correspondence |

Estimating Mean Pulmonary Artery Pressure From Systolic Pressure: A Caveat? FREE TO VIEW

Shyam Sunder Kothari, MD, DM
Author and Funding Information

All India Institute of Medical Sciences, New Delhi, India

Correspondence to: Shyam Sunder Kothari, MD, DM, All India Institute of Medical Sciences, Department of Cardiology, Ansari Nagar, New Delhi 110029, India; e-mail: kothariss@vsnl.com


The author has reported to the ACCP that no significant conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.

Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (www.chestjournal.org/misc/reprints.shtml).


Chest. 2008;134(5):1108. doi:10.1378/chest.08-1522
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To the Editor:

I read with interest the editorial in a recent issue of CHEST (March 2008)1 regarding mean pulmonary arterial pressure measurements made from systolic pulmonary artery pressure. This interesting concept that mean pulmonary pressure is predictable from the systolic pulmonary arterial pressure seems to fail in at least one situation. An infant with an unrestrictive ventricular septal defect with low pulmonary vascular resistance and high pulmonary blood flow, and another infant with high pulmonary vascular resistance and low blood flow both could have same systolic pressure, but different diastolic pressures and different mean pulmonary arterial pressures, as hitherto calculated. In other words, the mean recorded pressures of 90/20 and 90/50 mm Hg are different. Perhaps, the compliance in a hyperkinetic, volume-loaded, fully recruited vasculature system and an obliterative pulmonary vasculature with fixed vascular resistance behave differently from the lung with normal physiology under varying circumstances. Of course, within the given system, the mean pressure may be largely driven by systolic pressure, as documented by the authors.

Chemla D, Harve P. Estimation of mean pulmonary artery pressure simple than expected. Chest. 2008;133:592-593. [PubMed] [CrossRef]
 

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Chemla D, Harve P. Estimation of mean pulmonary artery pressure simple than expected. Chest. 2008;133:592-593. [PubMed] [CrossRef]
 
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