It is a chronic condition which affects those blood vessels which are related to lungs or from the lungs. Causes of pulmonary vascular diseases are varies according to lung’s blood vessels are affected. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field.