How should you handle BP measurement in a patient with atrial fibrillation?

• A. Take a single reading and accept it
• B. Do not measure in AF patients
• C. Expect irregular readings; take multiple measurements and average; consider validated AF-capable devices or ABPM/HBPM for confirmation
• D. Measure only with the left arm

Answer: (C)

In atrial fibrillation the heartbeat is irregular, so the blood pressure can vary a lot from beat to beat. The key to accurate measurement is to counter that variability by taking several readings and averaging them, ideally with a validated automated device that can handle irregular rhythms. If available, use an AF-capable device and consider confirming the overall blood pressure pattern with ambulatory or home blood pressure monitoring to get a clearer picture over time.

A single reading can mislead because it captures only one beat pattern, which in AF may not reflect typical BP. Measuring only from the left arm isn’t required, and the method should focus on using appropriate technique and multiple readings rather than a single result.