June 16, 2026

Understanding Mitochondrial Disease with Dr. Heather Gatcombe

1 hour 1 minute

Dr. Heather Gatcombe, a clinical radiation oncologist at Emory, who immediately humbles me by explaining that her job involves a lot more than drawing circles on a screen, it involves medical physics boards, cancer biology exams, and oral evaluations with the world's leading subspecialty experts. I'm putting radiation oncology in my "insanely smart doctors" tier, effective immediately. But Heather isn't just here to talk about contouring tumors. When her son was in second grade, his teacher noticed he couldn't move half his body and called 911. By the time EMS arrived, he seemed fine. Thus began a five-year diagnostic odyssey involving genetic testing, a muscle biopsy, a "variant of unknown significance," and ultimately a diagnosis of mitochondrial disease, a mutation that disrupts the body's ability to produce energy at the cellular level and can affect, well, pretty much every organ system you've got.

We get into all of it: what metabolic strokes actually are (an energy failure, not a clot), how heat, fasting, and illness can trigger a crisis, why the average time to diagnosis is a decade, and what happened when Heather's son arrived at the ER during COVID in acute heart failure and ended up on ECMO within 10 hours. He was 12. He received a heart transplant. He's now 17, knows his own body better than most doctors in the room, and asks for naps between soccer and his SATs. We also talk about what clinicians and patients can actually do to change the odds, including the United Mitochondrial Disease Foundation's mini-fellowship program at umdf.org. And yes, I finally admit the Krebs cycle is useful. The sad medical geneticist at the lunch table was right all along.

Takeaways:

Mitochondrial disease is a mutation that disrupts cellular energy production, affecting about 1 in 4,000 people, capable of impacting virtually any organ system, and taking an average of 10 years to diagnose in adults because it presents so differently in every patient.

A metabolic stroke is an energy failure, not a vascular event, a part of the brain simply runs out of fuel and shuts down, and it's treated with dextrose-containing IV fluids and IV arginine rather than clot-busting drugs.

For patients with mitochondrial disease, managing triggers is everything, fever, fasting, dehydration, heat, certain anesthetics, and even intense cognitive or physical stress can all precipitate a metabolic crisis or stroke.

Even having two physician parents and strong institutional connections didn't speed up the diagnosis, it still took five years, and for families without those resources, the average wait is closer to a decade, especially outside the Northeast where most of the 19 certified mitochondrial care centers are located.

There's a critical shortage of mitochondrial disease specialists, and the UMDF is working to fix it, their mini-fellowship program at umdf.org is open to residents and fellows PGY3 and above across all specialties, because mitochondria are in every cell and every kind of doctor needs to know what to look for.

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