|Dr. Susan Kirby|
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Dr. Susan Kirby is a cardiologist that appeared in A Change of Heart.
With Marvin Eriksen Sr.'s recent heart attack, the entire gang (minus Barney) get their hearts checked out by Dr. Kirby. Barney pulls Lily aside, and tells her he did make an appointment with Dr. Kirby to check his heart, but wants Lily to come with him because he's scared. At the doctor's, Barney is hooked up to a heart monitor, and returns twenty-four hours later to check the results. When viewing the results, Dr. Kirby spots a few abnormalities, and asks Barney to explain what he did over those twenty-four hours.