How to look at the mercury column of a sphygmomanometer to determine the blood pressure value

The commonly used brands of mercury sphygmomanometers are "Yuyue" and "Jade Rabbit".

Mercury blood pressure method of measuring blood pressure:

1 Measurement site: It is often measured at the brachial artery of the elbow fossa of the upper limb, and the artery of the leg fossa of the lower limb can also be removed.

2 Materials: sphygmomanometer, stethoscope.

3 How to Operate:

Before the measurement, the patient is given a 15-minute rest to eliminate the effects of exertion or stress on blood pressure.

Let the patient take a sitting or lying position, expose the right arm or left arm, roll up the sleeves to the shoulders, the cuffs should not be too tight, so as not to affect the blood flow, when the clothing is thick, take off one piece, straighten the elbows, and palm up.

Flatten the sphygmomanometer, drain the air in the cuff, wrap it in the middle of the upper arm smoothly and without folding, and the elastic should be a wonderful finger. Too tight can compress the blood vessels before they are inflated, making the measured blood pressure low; Too loose can make the air pocket balloon-shaped, which narrows the effective measurement area and makes the measured blood pressure high. The middle of the air bag should be in the cubital fossa, so that the pressure is just on the artery when inflated, the lower edge of the cuff is 2-3 cm above the cubital fossa, and the end is neatly tucked into the inner ring, and the mercury groove switch is turned on.

Put on a stethoscope and feel the brachial pulse point on the medial aspect of the cubital fossa. Place the stethoscope head close to the brachial artery of the cubital fossa, gently pressurize, fix it with your hand, close the valve screw cap on the balloon with the other hand, hold the balloon and pump it into the cuff until the brachial pulse sound disappears, then raise it by 20-30mmHg, and then slowly release the valve, at a speed of 2-5mmHg per second, to slowly lower the mercury, and pay attention to the scale referred to by the mercury. When the pressure in the cuff gradually decreases to the same as the contractile force of the heart, blood can pass through the compressed artery during the contraction of the heart, and the first pulse can be heard from the stethoscope, at which point is the scale of the mercury finger, which is called the systolic blood pressure.

The fluctuating sound then continues to exist and increases, and when the pressure in the cuff is equal to the diastolic pressure, the pulsatile sound suddenly weakens or disappears, and the scale referred to by the mercury column is diastolic.

The measured values are recorded using a fractional formula, i.e., systolic blood pressure and diastolic blood pressure mmhg. When dictating blood pressure values, systolic blood pressure should be read first, followed by diastolic blood pressure.

Introduce how to use a mercury sphygmomanometer.

Mercury sphygmomanometer measurement method: insert a fine needle from the upper hole of the mercury storage bottle and make a small hole to ensure that the upper hole is unobstructed; cleaning or replacing mercury storage bottles; Cleaning and filtering of mercury. When the mercury sphygmomanometer has zero point dislocation, mercury column bubbles or intermittent faults and other faults, it should not be disassembled, and should be immediately shut down and sent to the professional maintenance department for maintenance.

Mercury sphygmomanometer has the advantages of wide clinical application, good reliability and low cost. However, mercury sphygmomanometers need to be calibrated regularly, and mercury is highly toxic.

The mercury sphygmomanometer should be calibrated annually by turning on the mercury sphygmomanometer switch. If the mercury is zero or the mercury switch is turned on and tilted gradually, the mercury sphygmomanometer will reach 180mm mercury without interruption, indicating that the mercury sphygmomanometer is standard. Otherwise, the mercury sphygmomanometer will fail.

When using mercury blood pressure metering, you should pay attention to the following points:

1。Straighten out the hose to prevent knots and entanglements, and keep the air duct clear.

2。After opening the mercury tank, the mercury level should reach the zero line. If not, it must be repaired. This condition is due to insufficient mercury content, which can lead to inaccurate measurements, mercury delamination and even splashing.

Three. When the mercury level rises to a higher level, the inflation rate must be reduced to prevent mercury splashing due to some reasons.

Is there a difference between the wrist blood pressure monitor and the mercury column blood pressure monitor? How big is the difference?

Hello dear, there is a difference between a wrist sphygmomanometer and a mercury column sphygmomanometer, and if the measurement method is not correct, the difference may be relatively large, such as about 20 30mmgh. Generally, the value measured by raising the wrist will be low, and the value measured by lowering the wrist will be high. In addition, keep the wristband at the same height as the heart, keep the test process quiet, and the measured value is relatively accurate.

Generally speaking, try to consider using the arm type, because the measurement is more accurate, especially for the elderly, because the elderly blood vessels will have different degrees of hardening. The blood pressure in the wrist no longer properly reflects the pressure of blood in the arteries. Nowadays, many electronic sphygmomanometers have begun to use the third-generation measurement method to increase the pressure measurement, that is, to measure in the process of gassing, the measurement is faster, and the measurement method is more comfortable than the measurement method of the pressure reduction process.

1. First of all, as with other manometers, the person being measured needs to prepare for the measurement in advance to avoid fluctuations and changes in blood pressure due to the influence of external factors. Before the measurement, you should sit quietly for 5 to 10 minutes, and you should not smoke, strong tea, coffee and alcohol for half an hour, and empty it cheaply. The surroundings should be relatively quiet and avoid excessive noise.

It is recommended to sit with your legs hanging down naturally, your upper arms on the table, and your brachial artery at heart level. The chair needs to have a backrest, and the absence of back support can cause diastolic blood pressure to rise by about 6 mmHg. If the position of the upper arm is too high, the measured blood pressure value is often low, and if the position is too low, the measured blood pressure value is often high.

2. Secondly, we should pay attention to the appropriate length, width and width of the cuff of the blood pressure monitor, so as to measure the accurate blood pressure value. Generally, the length of the airbag in the cuff should be at least 2 3 of the circumference of the upper arm. Obese people with the cuff of the ordinary size balloon will cause the brachial artery to be unable to press, the measured blood pressure is high, should pay attention to the cuff capsule**, placed on the brachial artery, the ideal cuff balloon length is 80% of the arm circumference, the width is 40% of the arm circumference.

Children often have slender arms, and blood pressure levels are often low when measured with a standard cuff.

3. In the process of measurement, we should pay attention not to use too much force when inflating the airbag, because if you do not attach great importance to it, it will cause mercury overflow. The deflation speed should be 2-3mmHg seconds, the blood pressure value is higher if the deflation is too slow, and the blood pressure value measured is more low if the deflation is too fast. During the descent of the mercury column, the value of the first heart sound heard from the stethoscope is the systolic blood pressure, and the value when the heart sound disappears in the stethoscope is the diastolic blood pressure.

If the mercury column does not disappear to the zero position, the diastolic blood pressure is measured as the diacritic value.

4. After the measurement, we should also pay attention to the correct closure of the manometer, which can provide convenience for the next measurement and avoid affecting the results of the next measurement. Squeeze out the gas in the cuff balloon, place the inflatable balloon and cuff in a suitable position, tilt the blood pressure monitor to the right 45°, turn off the switch, and place the blood pressure monitor properly.