When Nathan Khosla was 8, he passed out in the water during a Saturday morning swim lesson.

He was rushed to the hospital and proclaimed fit to leave that evening. Two weeks later, it happened again.

Nathan, who recently graduated from Mt. Lebanon High School, was eventually diagnosed with Long Q-T Syndrome, a disorder of the heart's electrical system.

It's a condition that can kill without warning and is often suspected when seemingly healthy young athletes die suddenly after exertion.

But if detected early, Long Q-T Syndrome is treatable through medication.

"And sometimes, you can outgrow it," said Nathan, whose younger sister, Nina Maria, also has been diagnosed with LQTS, which falls into a group known as Sudden Arrhythmia Death Syndrome.

Nathan's Eagle Scout service project is a Heart Fair, July 12 and 13 at the Public Safety Center in Mt. Lebanon.

Heart Screen America (www.heartscreenamerica.com), a Massachusetts-based health organization, will bring staff and equipment to the site at 555 Washington Road from 9 a.m. to 5 p.m. each day. Participants must preregister at the Web site by Tuesday and a $10 refundable deposit holds the registration.

Screenings will include an electrocardiogram, body-mass indicator calculation, blood pressure measurement and general health assessment.

In addition, there will be CPR classes and automated external defibrillator demonstrations. To sign up for the free CPR classes, go to www.SadsEagleProject.com.

"I really started thinking about this in early September of last year," said Nathan, who will attend Carnegie Mellon University.

He began by asking his cardiologist about the possibility of arranging screenings. Liability and cost issues led him to contact the PULSE program at Pittsburgh's St. Margaret Foundation.

"The foundation was nice enough to grant the whole thing," said Nathan, who estimates the cost at $12,000 to 13,000.

David Bianco, PULSE program coordinator, will conduct the CPR classes in Mt. Lebanon.

"We get lots of requests [for project donations], but Nathan's is really tremendous," he said. "This kid's definitely taking it above and beyond."