Secondary pulmonary arterial hypertension includes all cases of pulmonary arterial hypertension except for those for which no cause is identified with are then termed idiopathic pulmonary arterial hypertension.
The classification of pulmonary arterial hypertension into primary and secondary has fallen out of favour, replaced by the more current 2003 third world symposium on pulmonary arterial hypertension classification.
For the purposes of day to day work (and exams) an anatomical classification often works best (see causes of pulmonary arterial hypertension).
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