Table 1.

Types of microvascular disease (from [5]).

Type	Description
1	Coronary microvascular dysfunction in the absence of obstructive CAD and myocardial diseases. The traditional cardiovascular risk factors of smoking, dyslipidemia and diabetes mellitus have been linked to this type.
2	Coronary microvascular dysfunction in the presence of myocardial diseases. This is thought to be due to adverse remodeling of intramural coronary arterioles.
3	Coronary microvascular dysfunction in the presence of obstructive CAD which may be in the context of stable CAD or acute coronary syndromes.
4	Iatrogenic coronary microvascular dysfunction. This includes vasoconstriction and distal embolization during procedures

$CFVR={APV}_{baseline}/{APV}_{hyperemia}$

where APV_baseline and APV_hyperemia are the averaged peak velocity at rest and stress respectively.