The pounding sound stops when the air pressure in the cuff falls below the diastolic blood pressure in the brachial artery. Right when you start to hear this pounding for the first time you can read your systolic blood pressure off the pressure meter. The sound can be heard by placing the stethoscope close to the elbow. Although not an SI unit, the millimetre of mercury is still routinely used in medicine, meteorology, aviation, and many other scientific fields. This creates a pounding sound when the arteries close again and the walls of the vessels hit each other after a heart beat. A millimetre of mercury is a manometric unit of pressure, formerly defined as the extra pressure generated by a column of mercury one millimetre high, and currently defined as exactly 133.322 387 415 pascals. Then the air is slowly let out of the cuff.Īs soon as the air pressure in the cuff falls below the systolic blood pressure in the brachial artery, blood will start to flow through the arm once again. To measure blood pressure, the cuff is placed around the bare and stretched out upper arm, and inflated until no blood can flow through the brachial artery. The pressure meter has a rubber pump on it for inflating the cuff and a button for letting the air out. How many Atmospheres in a Millimeter Mercury One Millimeter Mercury is equal to 0. The pressure p in atmospheres (atm) is equal to the pressure p in millimeter mercury (0°c) (mmHg) times 0.00132, that conversion formula: p(atm) p(mmHg) × 0.00132. The scale of the pressure meter ranges from 0 to 300 mmHg. 1 millimeter mercury (mmHg) is equal to 0.00132 atmospheres (atm). Pressure mmhg to atm manual#You can measure your blood pressure on your own using a digital blood pressure monitor for automated readings or an instrument called a sphygmomanometer for manual readings.Ī stethoscope for listening to the sound the blood makes as it flows through the brachial artery (the major artery found in your upper arm). The upper arm that is being used for the measurement should rest on a table, at about the same height as the heart, while the reading is being done. This means sitting down and relaxing on a chair, and waiting about three minutes before taking a measurement so that your circulatory system comes to rest. So to get reliable readings, blood pressure is measured on several different days and while you are resting. A blood pressure reading taken at the doctor’s office can also be misleading: Going to the doctor makes some people so nervous that their blood pressure goes up. So, if blood pressure is measured just once and found to be high, it doesn't necessarily mean that it's always too high. But this kind of increase in blood pressure is only temporary and it soon returns to normal. It can also change due to things like physical exertion, stress, pain, or extreme heat or cold. It's important to measure blood pressure more than once because it fluctuates over the course of the day. If the readings are repeatedly too high, there are several different ways of lowering your blood pressure and decreasing the risk of long-term health consequences. So if you or your doctor think you have high blood pressure, it's important to have your blood pressure checked regularly. Over the long term, high blood pressure increases your risk of cardiovascular problems like heart attacks, strokes, and heart and kidney failure. Only if it is extremely high can it sometimes result in symptoms like dizziness or trouble seeing. High blood pressure itself usually goes unnoticed. A person is considered to have high blood pressure if the systolic value is over 140 mmHg, the diastolic value is over 90 mmHg, or if both are higher than these readings. After that it is enough to measure the blood pressure only in the arm that produced the higher reading. The values that are higher are always the ones used for assessing blood pressure. When taking your blood pressure for the first time, it makes sense to measure the blood pressure in both arms, because it's sometimes high on only one side. In adults, blood pressure is considered to be normal under a systolic value of 140 mmHg and under a diastolic value of 90 mmHg. The medical term for high blood pressure is hypertension. If several of these measurements are too high, you are said to have high blood pressure, even if only one of the two – either the systolic or the diastolic one – is high. What is normal blood pressure, and when is blood pressure considered to be high?īlood pressure is always measured on a number of different days and when you are at rest.
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