A tiny balloon may be able to help doctors identify heart surgery patients who could be at risk of a potentially fatal complication.The tube-shaped balloon — which is just a couple of centimetres in length — is placed in the chest at the end of bypass surgery and other types of major heart procedures.Surgeons insert a thin wire through the chest with the deflated balloon on the end and, once in place inside the pericardial sac (the fibrous sac the heart sits in), the balloon is inflated.
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