October 07, 2026
A chance teaching moment on a slow day in Boulder became a story a Denver doctor’s family is still telling, and forever grateful for, decades later.
Mariah Bellinger, MD, was an emergency medical technician student rotating through the emergency department at the Boulder Community Health hospital in 2004 when she learned a lifesaving lesson. Cardiologist Matthew Holland, MD, invited Bellinger to follow him into the cardiac catheterization lab, where he began teaching her about heart disease and the warning signs that can signal a serious blockage.
As Holland described exertional chest pain and shortness of breath of a patient in her 70s, Bellinger thought of her dad.
An avid runner in his early 50s, he had been experiencing chest tightness and shortness of breath during his recent runs. He had undergone a stress test and was supposed to wait about another month for follow-up.
Bellinger mentioned his symptoms to Holland.
“I don't know how many other doctors would do this,” Bellinger recalled. “He said, ‘Here's my nurse's number. Have your dad call and set up an appointment right away and I'll see him and we’ll figure this out. We're gonna make sure he's OK.’”
Holland saw her father within two days. A cardiac catheterization – a procedure in which a thin tube is guided through a blood vessel to the heart so doctors can look for dangerous blockages – revealed a 99% blocked left anterior descending artery, a critical artery associated with the notorious “widow-maker” heart attack. He underwent surgery almost immediately and received a stent.
Bellinger remembers asking Holland what might have happened had the two never crossed paths that day.
“He probably wouldn’t be here,” Bellinger said. “We always talk about how Dr. Holland saved my dad's life.”
Waiting years to say thanks
Today, Bellinger is an emergency medicine physician at Denver Health’s Adult Urgent Care Center. Holland is director of interventional cardiology at Denver Health.
For years, Bellinger would see his name on staff and think she needed to tell him the story. Recently, while consulting Cardiology about a patient, she finally sent Holland a message, introducing herself and telling him how their paths crossed all those years ago.
“You saved my dad when I was an EMT student in Boulder years ago:) I am an ED doc now here, working in the urgent care,” she wrote.
For Bellinger, becoming a physician has only made Holland’s kindness all those years ago seem more remarkable.
For Holland, hearing where that EMT student, and her dad, ended up was pretty special, too.
“You don’t expect it,” Holland said. “It makes my day. It makes my week. It makes my month.”
Twenty-some years later, Bellinger’s dad, 76, is enjoying life to the fullest, still skiing, boating, traveling and keeping up with four grandchildren.
