Final answer:
It is true that using a blood pressure cuff that is too small can result in falsely high blood pressure readings. It's important to use a cuff size appropriate to the patient's arm to get accurate measurements. Technique and positioning are also crucial in obtaining a correct reading.
Step-by-step explanation:
Using a blood pressure cuff that is too small for the patient can indeed result in false high readings. This is true because when the cuff is too small, it requires more pressure to compress the artery. This extra pressure can lead to an overestimation of the patient's actual blood pressure. It's essential to select a cuff size that is appropriate for the patient's arm circumference to ensure accurate readings.
Sphygmomanometers, which often include a valved rubber bulb to inflate the cuff and a diaphragm gauge to measure pressure, are commonly used for this measurement. Proper technique is crucial when measuring blood pressure to avoid any errors that could affect the patient's diagnosis or treatment.
Furthermore, other factors like the positioning of the arm relative to the heart or the placement of the cuff can also affect the measurement outcomes. For instance, if the arm is raised above the shoulder or if the measurement is taken on the upper leg while standing, the readings can be influenced by the weight of the blood itself due to hydrostatic pressure changes.