For cardiovascular guidelines, what is the definition of pulmonary hypertension?
a) Pulmonary artery pressure greater than 40% of systemic systolic blood
b) Pulmonary artery pressure greater than 50% of systemic systolic blood
c) Pulmonary artery pressure greater than 60% of systemic systolic blood
d) Pulmonary artery pressure greater than 65% of systemic systolic blood