Table 2.

Comparison of coronary slow flow phenomenon (CSFP) versus syndrome X.

CSFP	Syndrome X
Males [29]	Postmenopausal females [29]
Current smokers [29]	Current or past smokers [29]
Unstable angina [30]	Stress-related angina [30]
Elevated resting microvascular tone [31]	Normal resting microvascular tone [31]
Normal vasodilator response to papaverine, adenosine, and during exercise [31]	Typically absent [31]
Greater rate of life threatening cardiac arrhythmias and sudden cardiac death [27]	Lower incidence as compared to CSFP [27]