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A false low blood pressure reading can occur when the cuff used for measurement is too wide. A cuff that is excessively wide may not adequately compress the arteries, leading to an underestimation of the actual pressure within the arteries. This issue can skew the reading, making it appear lower than it truly is.

In clinical practice, the accuracy of blood pressure readings is vital, and using a correctly sized cuff is critical for reliable measurements. Cuffs that are either too wide or too narrow can significantly affect the accuracy of the reading, but in this case, a cuff that is too wide specifically contributes to a false low reading due to insufficient pressure being applied to the arm.

For proper blood pressure monitoring, healthcare providers need to assess the circumference of the arm to select a cuff that matches the recommended guidelines to ensure accurate outcomes.