Here is a medical products company video of a Siemens SC 7000 patient monitor which starts off with the flat-lining sound. If you watch and inspect the configuration menus, you'll see that a wide variety of sounds can be configured for any of several conditions: high and/or low heart rate, high/low partial-pressure of oxygen saturation, high/low partial-pressure of carbon dioxide, high/low arterial pressure, high/low breathing rate.
With an old-fashioned single purpose cardiac monitor like the Graseby PM 3, those beep on every heartbeat, and are quiet at first when there is no heartbeat, but then gives the flat line sound after a few seconds.
Why do you think the sound is not genuine?
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