The main disadvantages of measuring blood pressure with a mechanical tonometer are related to several factors. Firstly, the accuracy of the measurements depends on the individual characteristics of the person conducting the procedure. Good vision, hearing, and coordination of movements ("hands – vision – hearing") are required. People with impairments in vision, hearing, or motor skills may experience difficulties using a mechanical tonometer.
The mechanical tonometer is also sensitive to external conditions such as noise in the room. External sounds can interfere with correctly hearing the heart tones through the stethoscope, affecting measurement accuracy. The accuracy also depends on the correct positioning of the stethoscope head relative to the artery. Incorrect positioning can lead to distorted results.
Additionally, the mechanical tonometer requires direct contact of the cuff and stethoscope head with the patient's skin, which can cause discomfort and increase the risk of infections with insufficient hygiene.
Another significant drawback is the technical complexity of using the device. Improper handling can lead to erroneous blood pressure readings. Accurate measurement requires special training, without which there is a high risk of incorrect procedure and interpretation of the results.