sinus heart rhythm electrocardiogram record paper showing normal wave and interval qrs complex |
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| navigate by keyword : analysis background beat blue cannabis cardiogram cardiology care chart complex diagnosis digital doctor ecg ekg electrocardiogram equipment frequency graph grid health healthy heart heartbeat hospital human interval life line medical medicine monitor normal paper pressure pulse qrs rate record rhythm science screen showing sinus symbols technology test tool trace wave |
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| Sinus Heart Rhythm On Electrocardiogram Record Paper Showing Normal P Wave, PR and QT Interval and QRS Complex, EKG paper |
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