LETTER
Articles: Survival in Primary Pulmonary Hypertension with Long-Term Continuous Intravenous Prostacyclin
Robyn J. Barst;
Lewis J. Rubin;
Michael D. McGoon;
Edgar J. Caldwell;
Walker A. Long; and
Paul S. Levy
1 February 1995 | Volume 122 Issue 3 | Page 238
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Correction: Incorrect Formula
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A recent article on survival in primary pulmonary hypertension [1] contained an error in the formula for predicting survival. The correct formula is as follows:
P(t) = (H[t])A(x,y,z)
H(t) = (0.88 –0.14 t + 0.01t2)
A (x,y,z) = e sup (0.007325x + 0.0526y –0.3275 z)
where
x = mean pulmonary artery pressure
y = mean right atrial pressure
z = cardiac index
1. Barst RJ, Rubin LJ, McGoon MD, Caldwell EJ, Long WA, Levy PS. Survival in primary pulmonary hypertension with long-term continuous intravenous prostacyclin. Ann Intern Med. 1994; 121:409-15.
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