Observational Study of the Association between TCM Zheng and Types of Coronary Artery Stenosis: Protocol of a Multicenter Case Series Study

Table 2

Indications for revascularization in patients with stable coronary artery disease.

Extent of CHD	Class	Level
For prognosis
Left main disease with stenosis >50%	I	A
Any proximal LAD stenosis >50%	I	A
Two-vessel or three-vessel disease with stenosis >50% with impaired LV function (LVEF<40%)	I	A
Large area of ischaemia (>10% LV)	I	A
Single remaining patent coronary artery with stenosis >50%	I	B
For symptoms	I	C
Any coronary stenosis >50% in the presence of limiting angina or angina equivalent, unresponsive to medical therapy	I	A

LAD: left anterior descending coronary artery; LV: left ventricular.