Figure 152b

* a) Inflation of the balloon during diastole (= augmentation of the aortic diastolic pressure) increases coronary blood flow ( DPTI ).
* b) Deflation of the balloon occurs just prior to the onset of systole and reduces impedance to left ventricular ejection (TTI ). This results in less myocardial work, decreased myocardial oxygen consumption and increased cardiac output 16

Schematic representation of coronary blood flow, aortic and left ventricular pressure wave form with / without IABP. (Effects on DPTI and TTI . Balloon inflation during diastole augments diastolic pressure and increases coronary perfusion pressure as well as improving the relationship between myocardial oxygen supply and demand (DPTI:TTI ratio)

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