With the rapid development of China's economy and the continuous improvement of people's living standards, electronic sphygmomanometers have gradually replaced traditional mercury sphygmomanometers as a must for many families. Which of the electronic sphygmomanometers and mercury sphygmomanometers is more accurate? So let's take a look at the measurement principle of the sphygmomanometer. On the market, a wide variety of sphygmomanometers are generally divided into two types: invasive pressure measurement systems and non-invasive pressure measurement systems. Non-invasive is divided into non-invasive automatic measurement sphygmomanometer and non-invasive non-automatic side sphygmomanometer. 1 Invasive pressure measurement system mainly measures blood pressure directly through the arterial indwelling needle The invasive pressure measurement system mainly measures blood pressure directly through the arterial indwelling needle. This method is generally considered to be the "gold standard" for blood pressure measurement. In the measurement, attention should be paid to the fidelity requirement of the indwelling needle, whether the sensor position is correct, and the aorta. And the identification of the difference in peripheral arterial pressure, etc., it is a true direct measurement of blood pressure, and has continuous detectability. However, this technique poses a certain risk to the patient and is generally only used when the patient's hemodynamic conditions require it. Therefore, it cannot be widely applied. Non-invasive pressure measurement systems include non-automatic measurement equipment and electronic measurement equipment. The main measurement principle of non-automatic measuring equipment is to measure by Korotkoff method. The principle of electronic measuring equipment is oscillometric method. In 1905, Nikoroy of Russia, Korotov discovered the vascular sound, which has now become the basis of the auscultation of the world's broad-based syllabus. The Korotkoff sound method is named after Korotov. The Korotkoff method measures blood pressure by listening to the sound of a blood flowing through a blood vessel (Crotov). The upper arm band is fed with air and gradually pressurized to cut off the circulation of arterial blood. As the air in the armband is gradually discharged, the blood flow begins to return to flow when a certain pressure is applied, and a Korotov sound is produced. The pressure at this time is called the highest blood pressure. Further, when the pressure in the arm band is discharged and the blood vessel returns to a normal state, the Korotov sound is not heard. The pressure at this time is called the lowest blood pressure. This is by far the most widely used measurement method. A large number of experiments have shown that the blood pressure value of the wound pressure measurement is highly correlated with the clinical data measured by the mercury sphygmomanometer auscultation method. It is generally considered that the invasive blood pressure is higher than the non-invasive blood pressure (5 to 20) mmHg. 2 Measuring blood pressure using a mercury sphygmomanometer The use of mercury sphygmomanometer to measure blood pressure, high accuracy and credibility, but its shortcomings are also obvious: inconvenient to carry, mercury leakage is likely to cause environmental pollution, low resolution, high user requirements and so on. In the use of mercury column blood pressure, the factors that affect the accuracy of the sphygmomanometer are: (1) Instrument error, as the time of use increases, a small amount of mercury will evaporate, causing an error in mercury deficiency. Further, in use, dust in the guest gas will be carried into the mercury and attached to the pipe wall. This results in reduced sensitivity and affects the accuracy of the measurement. (2) Degassing rate and deflation rate are the most important factors affecting the measurement of mercury sphygmomanometer. The mercury sphygmomanometers currently used are generally manually deflated, and different deflation rates can easily lead to different measurement results. Experiments have shown that patients with the same actual systolic blood pressure of 149 mmHg were measured at a rate of 10 mmHg/s and 3 mmHg/s, and the results were 140 mmHg and 147 mmHg, respectively, with a difference of 7 mmHg. Experiments have shown that in the use of mercury column blood pressure timing, the rate of deflation should be controlled at a rate of 3 mmHg / s, the measurement results are closest to the real blood pressure. (3) The size of the cuff. The cuff is composed of a cloth or synthetic fiber wrapped in a balloon. The cuff pressure directly affects the blood flow of the radial artery. The ratio of the circumference of the upper arm to the width of the cuff has an important influence on the accuracy of blood pressure measurement. According to the international standard ISO81060-1 "non-invasive non-automatic blood pressure monitor", the length of the sleeve should be close to 0.8 times the circumference at the midpoint of the cuff's applicable range, and the width of the sleeve should be the arm circumference at the midpoint of the cuff measurement range. 0.4 times longer. Each of us has different arm circumferences, but we use the same size sleeves to measure blood pressure, so it will inevitably affect the measurement results. (4) The influence of the user's hearing, vision and other factors, because the user needs to cooperate with the stethoscope to measure blood pressure, each person's hearing response is different, and the visual acuity of the reading is also biased, which easily causes errors. This requires measurements by professional, trained personnel to reduce measurement errors. Although corn is sweet, it is important to note that it is a medium glycemic index food, which means that the sugar content is not very high, so why does it taste sweet? This is a question for many people. In fact, corn tastes sweet because it contains soluble new sugar substances, but in general, its carbohydrate content is actually not high, so it is still suitable for people with high blood sugar to use as a staple food to help control blood sugar. Black Waxy Corn,Black Glutinous Corn,Glutinous Corn Kernels,Black Glutinous Corn Kernels Jilin Province Argricultural Sister-in-law Food Co., Ltd. , https://www.nscorn.com
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