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Complications could include:
Congestive heart failure (CHF) is a chronic condition that affects the chambers of your heart. CHF refers to fluid buildup around your heart.
Enlarged spleen (splenomegaly) affects the spleen, which found on the left side of the body, below the rib cage. Infections, like mononucleosis, are among the most common causes of splenomegaly.
An arrhythmia occurs when electrical impulses, which direct and regulate heartbeats, don't function properly. Heart arrhythmias are common and usually harmless.
An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped.