Classification | Cause of coronary heart disease
Classification There are 4 degrees of severity of coronary narrowing, corresponding to the reduction of the vessel cross-section: Grade I is present when the diameter is 35-49% smaller Grade II is a reduction of 50-74% (significant stenosis) Grade III means a narrowing of 75-99% (critical stenosis) and in Grade IV is a complete occlusion or … Classification | Cause of coronary heart disease