The first paragraph is just the doctors dictation of the diagnoses that he carries (COPD, hypertension, high cholesterol, gout, arthritis, BPH) and chest pain which was resolved with nitroglycerin. The IHD
means ischemic heart disease, which
means there is some heart disease caused by narrowed heart arteries.
However, the second paragraph you give the 80-90 stenosis of RCA which is non-dominant.