Conclusion:
Aortic Cannula size should be selected in conjunction with the perfusionist team to utilize the appropriate cannula for adequate flow during CPB. It is imperative to finally decide the aortic cannula size after observing the ascending aorta size after opening the chest. Use of an inappropriately large aortic cannula particularly in neonates and children can obstruct the aortic blood flow before and after CPB and patient may develop refractory LV distension and cardiac arrest.