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The manual blood pressure monitor works by generating a pressure higher than the expected diastolic blood pressure, hindering the flow of blood. Subsequently, the pressure gradually decreases. Despite the presence of modern electronic blood pressure monitors in the market, many still prefer the manual option. So, what is a manual blood pressure monitor, and is it effective? Let's explore in this article.
Principle of operation of manual blood pressure monitors
When using a manual blood pressure monitor, the blood flow in the arm artery is obstructed by the cuff. After wrapping the cuff around the arm, it is pumped tight until the air inside creates enough pressure to impede blood flow.
When the valve is opened, the air in the cuff escapes, causing the generated pressure to gradually decrease. When the cuff pressure matches the person's systolic blood pressure, blood will flow through the cuff, leading to changes in blood flow and audible sounds when using the stethoscope.
The pressure created by the cuff will continue to decrease until the sound from the blood flow changes vanish. At this moment, the cuff pressure is lower than the arterial systolic blood pressure. Identifying the time when the sound disappears, the number on the gauge then represents the systolic blood pressure.
Considerations when using manual blood pressure monitors
- To measure blood pressure as accurately as possible, it is crucial to choose a cuff with a size suitable for the patient's arm.
- The person being measured must ensure both mental and physical relaxation. The patient should relax for 5 minutes before measurement.
- Minimize conversation during blood pressure measurement.
- The cuff needs direct contact with the skin. The person conducting the blood pressure measurement should avoid measuring over clothing.
- Blood pressure measurement should be performed at room temperature.
- The blood pressure measurement posture needs to be accurate. The person being measured should sit upright, feet on the ground, both hands embracing the cuff placed across the chest and on a flat surface.
- Avoid using stimulant-containing products such as alcohol, tobacco, etc., or engaging in strenuous activity within 30 minutes before checking blood pressure.
Comparison between electronic and manual blood pressure
- Durability: Manual blood pressure monitors have high durability and good impact resistance. In contrast, the durability of electronic blood pressure monitors is often lower than manual ones.
- Professional skill requirements: Mechanical blood pressure monitors are only used by trained and experienced individuals. Electronic blood pressure monitors, such as Omron, not only provide accurate blood pressure readings but also come with additional features such as storing measurement results, alerting for abnormal blood pressure signs, pulse rate monitoring, etc.
- Maintenance: Mechanical blood pressure monitors require regular maintenance, especially the gauge, to avoid machine errors. Electronic blood pressure monitors require less maintenance, saving time.
- Cost: Manual blood pressure monitors are usually cheaper than electronic ones. Additionally, electronic blood pressure monitors require additional energy costs such as batteries and electricity, while mechanical ones do not.
