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The interaction showcases a live ECG reading on an Apple Watch interface. A white dot traces a red pulse waveform from left to right, looping continuously while a large countdown timer ticks down from 9 seconds to 0. Simultaneously, the heart rate (BPM) dynamically updates in the top-left corner. Upon reaching 0 seconds, the active measurement screen smoothly blurs and fades out, transitioning into a static results screen ('Sinus Rhythm') which fades in to display the final diagnostic summary.
