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J Thorac Cardiovasc Surg 2005;130:952
© 2005 The American Association for Thoracic Surgery

Letters to the Editor

Pressure gradient in hemodynamics: Is it measured in units of pressure?

Aristotle D. Protopapas, FRCS

26 Abbotts Ann Rd, Winchester, Hants SO22 6NB, United Kingdom

To the Editor:

I read with interest the article on pulmonary banding by Piluiko and colleagues 1 Go and the relevant discussion. Piluiko and colleagues 1 Go repeatedly expressed values of the "pressure gradient" across the banded pulmonary artery in units of pressure (milliliters of mercury). They thus committed an inaccuracy common in biomedical scripts. The correct formula for expressing a hemodynamic gradient should be pressure divided by distance (millimeters of mercury per millimeter). Alternatively, the term pressure gradient should be replaced with pressure difference, the latter being appropriate in this case because the accurate computation of the former may not be easy by conventional angiography.

References

  1. Piluiko VV, Poynter JA, Nemeh H, Thomas RL, Forbes TJ, Delius RE, et al. Efficacy of intraluminal pulmonary artery banding. J Thorac Cardiovasc Surg 2005;129:544-550.[Abstract/Free Full Text]

Related Article

Reply to the Editor:

J. Thorac. Cardiovasc. Surg. 130: 952-952. [Full Text]




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