Dale Hoyt sees his cardiologist every six weeks at Massachusetts General Hospital, but he’s never out of touch for long. Every day, he checks his blood pressure, heart rate, and weight and logs them on his iPhone, and periodically he e-mails the data to Dr. Kimberly Parks.

Hoyt, 60, of Berlin, Conn., has congestive heart failure and coronary artery disease. He’s on the heart transplant list, and while he waits, he needs to track his vital signs and symptoms meticulously. But until he met Parks, in 2009, he wasn’t doing it.

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