Blood pressure is one of the most common health checks in the world. Many people have had their blood pressure measured at a clinic, pharmacy, or hospital. It is a quick and simple test, but it plays a very important role in detecting serious health problems.
High blood pressure, also known as hypertension, is a major risk factor for heart disease, stroke, and heart attacks. It is also one of the leading causes of early death worldwide. Because of this, getting an accurate blood pressure reading is very important.
However, new research from the University of Cambridge suggests that the way blood pressure is usually measured may not be as accurate as we think.
The study, published in the journal PNAS Nexus, explains why the traditional cuff-based method can sometimes give incorrect results. It also shows that simple changes could improve accuracy without needing new equipment.
Most people are familiar with how blood pressure is measured. A cuff is wrapped around the upper arm and inflated until it stops blood flow. Then, the cuff slowly deflates while a doctor or nurse listens for specific tapping sounds using a stethoscope. These sounds help determine when blood starts flowing again.
The reading gives two numbers. The top number is called systolic pressure, which measures the force of blood when the heart beats. The bottom number is called diastolic pressure, which measures the pressure when the heart is resting between beats. A normal reading is usually around 120 over 80.
This method, known as the auscultatory method, has been used for many years and is often considered the standard way to measure blood pressure. However, researchers have found that it may not always give correct results.
According to researcher Kate Bassil from Cambridge, this method often underestimates systolic pressure and overestimates diastolic pressure. This means that some people may actually have higher blood pressure than their readings show.
In fact, up to 30 percent of people with high blood pressure may go undiagnosed because of these measurement errors. This can delay treatment and increase the risk of serious health problems.
To better understand why this happens, the research team built a model to study how blood pressure is measured. In the past, scientists used rubber tubes to represent arteries, but these did not behave like real human blood vessels.
The Cambridge team used improved materials that act more like real arteries. These tubes can flatten and close under pressure, similar to how real arteries behave when squeezed by a cuff.
Using this model, the researchers discovered an important problem. When the cuff squeezes the arm, it stops blood flow to the lower part of the arm. This creates very low pressure in that area.
Because of this low pressure, the artery stays closed for longer as the cuff deflates. This delays the moment when blood flow starts again, which is the key signal used to measure systolic pressure.
As a result, the systolic pressure is recorded as lower than it actually is. This delay is a major reason why the readings can be inaccurate.
The good news is that fixing this problem may not require new devices. The researchers suggest that simple changes in how blood pressure is measured could improve accuracy.
For example, raising the patient’s arm before taking a reading may help balance the pressure in the arm and reduce errors. This small adjustment could make a big difference in getting more accurate results.
In the future, new devices could also include more personalized information, such as age, body type, and tissue characteristics, to improve readings even further.
The research team now plans to test their findings in real patients. They hope to work with doctors and other scientists to confirm their results and improve blood pressure measurement for people around the world.
This study helps solve a long-standing mystery in medicine. More importantly, it offers a simple and practical way to improve one of the most common health tests.
Better blood pressure readings can lead to earlier diagnosis, better treatment, and improved health outcomes. By making small changes, we may be able to help many people detect and manage high blood pressure more effectively.
If you care about high blood pressure, please read studies about what to eat and to avoid for high blood pressure, and 12 foods that lower blood pressure.
For more health information, please see recent studies about the connection between potato and high blood pressure, and how to eat your way to healthy blood pressure.
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