The human heart is a complex bundle of arteries, veins and chambers, a forever contracting and expanding organ that blasts blood throughout the body.

In some rare cases, a heart’s muscles can enlarge and thicken because of a genetic condition called hypertrophic cardiomyopathy. The disease is the No.1 cause of sudden cardiac death in young athletes, and it has no cure.

Star Lotulelei, by all accounts, does not have hypertrophic cardiomyopathy.

But when a standard medical screening at the NFL Combine in February showed that Lotulelei might have one of the condition’s key symptoms, it damaged his once-lofty draft prospects nonetheless.

Lotulelei, once a candidate to be the top pick in next week’s draft, is now a wild card. He could go to the Eagles with the fourth overall pick, or he could fall to the low teens.

That uncertainty could open the door for Dolphins general manager Jeff Ireland, who covets defensive tackles, to select Lotulelei — so long as he’s confident about the Tongan giant’s health.

The good news: Based on all the information made public over the past month, Lotulelei’s abnormal test in Indianapolis was a fluke.

“I wouldn’t have any concerns about [drafting him],” said Dr. Clifton Page, a sports medicine internist with the University of Miami Health System.