Which instrument is used for indirectly determining arterial blood pressure?

The correct choice is the sphygmomanometer, which is specifically designed to measure blood pressure by detecting the oscillations in blood flow as it is occluded and then released. This instrument typically consists of a cuff that is inflated around the upper arm, a manometer for reading the pressure, and often a stethoscope to listen for the Korotkoff sounds as the blood flow resumes.

This indirect measurement technique allows healthcare professionals to assess arterial blood pressure without the need for invasive procedures, making it a standard practice in clinical settings for monitoring cardiovascular health. It provides essential information regarding the force of blood against the arterial walls, which is crucial for diagnosing and managing conditions such as hypertension.

The other options listed do not relate to blood pressure measurement. While terms like spasmolygmus and somnambulism refer to muscle spasms and sleepwalking, respectively, sprematicedal does not correspond to a recognized medical instrument or term associated with blood pressure metrics.