The presence of a<unk>  pattern (systolic<unk>  reversal) in epicardial coronary arteries is associated with slower<unk>  with impaired myocardial perfusion and adverse cardiovascular outcomes.<unk> ty signifies an increased vascular resistance and may be used for risk stratification on coronary angiography.
Pulsatile flow
Pressure gradient 
Accessory pathway
No-reflow phenomenon
Venous cutdown
Afterload
Negative inotropy
Stacking 