The major complications that are possible include:

Blood clots

Failure of medical equipment

Serious bleeding

Decreased ability of the heart to deliver blood because the heart sac fills with fluid

Formation of abnormal connection between an artery and a vein

Perforation or a tear in the heart or arteries

Blood vessel injury or spasm

Infections

Breathing problems or respiratory arrest

Serious allergic reactions

Irregular heart rhythms

Stroke

Nerve or organ damage

Heart attack

Loss of a limb or its function and

Loss of life