What a biostatistician says about ECG+
One of our long-term users spent the first 15 years of his career as an R&D biostatistician, and more than 20 years after that as an IT executive in large international life-science companies. He is not a cardiologist or electrophysiologist, just a patient with relatively minor atrial arrhythmias who wanted to understand what his own data could tell him. He has used ECG+ for several years to track his premature-beat burden over time and bring that longitudinal picture to his cardiologist. He shared his perspective with us, and gave us permission to publish it.
Why trends matter more than single recordings
His starting point is a problem that anyone living with an arrhythmia will recognize: the things that move the needle, symptoms, medications, procedures, and lifestyle changes, often take weeks or months to show their effect. A single ECG is a snapshot. What he wanted was the shape of the curve.
"As a former R&D biostatistician, I am interested in trends, not individual data points. ECG+ has allowed me to track ECG measurements over time and evaluate the effects of medications, procedures, and exercise on my heart rhythm. It has helped me become a more informed participant in discussions with my physicians."— Former R&D biostatistician and long-term ECG+ user
That is exactly the gap ECG+ is built to fill. The Apple Watch records each ECG in isolation; it does not assemble those recordings into a history. ECG+ keeps every reading, counts the premature beats in each one, and lets you watch your premature-beat burden rise or fall across months rather than guessing from one strip to the next.
Tracking PAC burden across medication changes
For him, the value of the app is in collecting and organizing measurements he could not easily get from the standard Apple Watch experience, and then reading them as a series:
"ECG+ has been particularly valuable because it allows me to collect, organize, and analyze ECG measurements from my Apple Watch in a way that goes beyond the standard ECG experience."
Over several years he has used that record to track the changes associated with medication adjustments, electrophysiology evaluations, and his exercise patterns. The biostatistician's instinct shows in how he reads it, separating signal from noise:
"Having access to longitudinal data made it possible to evaluate whether observed changes were likely to represent meaningful trends rather than isolated observations."
That distinction matters most around medication. When a dose changes, the question is whether the premature beats genuinely settled or just happened to be quiet that week. A trend line across many recordings answers that far better than any single reading, and it gives his cardiologist concrete numbers to weigh when deciding whether to adjust the dose. The decision stays with the doctor; the data helps inform it. (More on that in what to ask your doctor about your Apple Watch ECG.)
What it is, and what it is not
He is careful about the limits, and we think his framing belongs here alongside the praise:
In his own words
- It does not diagnose. In his words, ECG+ "does not diagnose disease, replace medical judgment, or provide definitive answers."
- It helps you ask better questions. What it can do is "help informed patients ask better questions and participate more effectively in conversations with their healthcare team."
- It is not a research instrument. "ECG+ will not turn an Apple Watch into a medical research device." Its value, he notes, depends entirely on how it is used.
- It is most useful for tracking over time. For patients interested in following their cardiac data, he found it provides "capabilities that I have found genuinely useful and difficult to obtain elsewhere."
That is the spirit in which ECG+ is meant to be used: not to self-diagnose or replace a clinician, but to give technically minded patients an organized record they can review systematically and discuss with their physicians.
In summary
From a career spent reading data for a living, his takeaway is simple: the worth of an Apple Watch ECG grows when you can see it as a trend rather than a single point. Used that way, ECG+ helped him track his premature-beat burden through medication changes, procedures, and exercise, distinguish real movement from noise, and walk into appointments as a more informed participant. We're grateful he shared his perspective.
This perspective was shared with Heartworks by a long-term ECG+ user, a former R&D biostatistician, who asked to remain anonymous; it is published with his permission and lightly edited for length. His account reflects his own experience and is not a paid endorsement. ECG+ is not a medical device and does not provide a diagnosis or dosing advice, always discuss findings and any medication changes with a qualified clinician. See our disclaimer.