The gold standard of blood pressure measurement is auscultation using a mercury sphygmomanometer. Newer devices can provide accurate readings but require calibration.
What is high blood pressure (hypertension)?
| Blood Pressure Levels |
|---|
| Normal | systolic: less than 120 mm Hgdiastolic: less than 80 mm Hg |
| At Risk (prehypertension) | systolic: 120–139 mm Hg diastolic: 80–89 mm Hg |
| High Blood Pressure (hypertension) | systolic: 140 mm Hg or higher diastolic: 90 mm Hg or higher |
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| S No. | Product Name | Price |
|---|
| 1 | Dr.Morepen BP02 Automatic Blood Pressure Monitor (White) | ₹ 1,395 |
| 2 | ELKO E-510 FDA Approved Upper Arm Fully Automatic Digital BP Machine Blood pressure Monitor with Smart Inflation Technology (White/Blue) | ₹ 1,199 |
Conclusion. The aneroid device had better accuracy than the digital device as compared to mercury sphygmomanometer and should be used for proper and better management.
Place your index and middle finger of your hand on the inner wrist of the other arm, just below the base of the thumb. You should feel a tapping or pulsing against your fingers. Count the number of taps you feel in 10 seconds. Multiply that number by 6 to find out your heart-rate for one minute.
D. Mercury is used in blood pressure measurement in blood pressure monitors or sphygmomanometers. The device consists of a mercury manometer in which mercury rises to a certain height in response to blood pressure. Mercury has traditionally been used in pressure measurements (in manometers) and in thermometers.
Water is not able to be used as a thermometer liquid because of its higher freezing point and lower boiling point than the other liquids in general. This range is very negligible as compared to other liquids like mercury which has a freezing point of about −39∘C and boiling point 356∘C.
Barometers measure atmospheric pressure. Mercury barometers consist of a glass tube that is closed at one end, with a mercury-filled reservoir at the base. Often, one end of the tube is open to the atmosphere so that the elemental mercury is exposed to air. Manometers measure the difference in gas pressure.
To measure blood pressure, your doctor uses an instrument call a sphygmomanometer, which is more often referred to as a blood pressure cuff.
Mercury fever thermometers are made of glass the size of a straw, with a silvery-white liquid inside. Oral/rectal/baby thermometers, containing about 0.61 grams of mercury. Basal temperature thermometers (used to track slight changes in body temperature), containing about 2.25 grams of mercury.
Mercury is a useful material to use in a manometer because of its high density. This means that a much shorter column is needed compared to water. For instance, the pressure represented by a column of 100 mm of water is just under 7.4 mm of mercury (mmHg).
mercury uncountable noun. Mercury is a silver-coloured liquid metal, used in thermometers. /para, pArA, paaraa, pārā/
There is a technical reason for using mercury in clinical thermometers. Mercury has a greater coefficient of thermal expansion than alcohol. This means a column of mercury will expand and rise more than a column of alcohol for the same temperature change. As a result, you can get finer readings with mercury.
Depending on the exact classification used, pressures around 140-150/90-100 would be called mild hypertension. Pressures around 150-170/100-110 would be called moderate, and pressures higher, e.g. 200/120 would be considered fairly severe.
high blood pressure is considered to be 140/90mmHg or higher (or 150/90mmHg or higher if you're over the age of 80) ideal blood pressure is usually considered to be between 90/60mmHg and 120/80mmHg.
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| Normal blood pressure | 90/60 to under 120/80 mm Hg. |
|---|
| Prehypertension, or risk for hypertension | 120-139/80-89 mm Hg |
| Stage 1 hypertension | 140-159/90-99 mm Hg. |
| Stage 2 hypertension | over 160/100 mm Hg. |
ideal blood pressure is considered to be between 90/60mmHg and 120/80mmHg. high blood pressure is considered to be 140/90mmHg or higher. low blood pressure is considered to be 90/60mmHg or lower.
Your doctorIf your blood pressure is higher than 160/100 mmHg, then three visits are enough. If your blood pressure is higher than 140/90 mmHg, then five visits are needed before a diagnosis can be made. If either your systolic or diastolic blood pressure stays high, then the diagnosis of hypertension can be made.
Blood pressure readings above 180/120 mmHg are considered stroke-level, dangerously high and require immediate medical attention.
A healthy blood pressure reading should be lower than 120/80 mmHg. Normal blood pressure is less than 120 mmHg systolic and 80 mmHg diastolic (see blood pressure chart below), and may vary from 90/60 mmHg to 120/80 mmHg in a healthy young woman. A blood pressure of 140/90 mmHg or higher indicates high blood pressure.
Normal Blood Pressure By Age
| Age | SBP | DBP |
|---|
| 21-25 | 120.5 | 78.5 |
| 26-30 | 119.5 | 76.5 |
| 31-35 | 114.5 | 75.5 |
| 36-40 | 120.5 | 75.5 |
Both blood pressure increases and decreases in response to a change in posture have been associated cross-sectionally with higher blood pressure and a greater prevalence of hypertension.
Sphygmomanometers. Many aneroid or electronic sphygmomanometers do not contain mercury. Using a mercury-free sphygmomanometer will reduce the risk of exposure to both patients and workers. Mercury-free sphygmomanometers also do not cause environmental contamination if they break or when they are disposed.
Normal — Blood pressure readings of less than 120/80 mm Hg are considered in the normal range. Elevated — Readings consistently ranging from 120–129 systolic and less than 80 mm Hg diastolic are considered elevated.
Procedures
- To begin blood pressure measurement, use a properly sized blood pressure cuff.
- Wrap the cuff around the upper arm with the cuff's lower edge one inch above the antecubital fossa.
- Lightly press the stethoscope's bell over the brachial artery just below the cuff's edge.
- Rapidly inflate the cuff to 180mmHg.
In 1881, von Basch created the sphygmomanometer and the first non-invasive BP measurements. However, in 1896, Scipione Riva-Rocci developed further the mercury sphygmomanometer, almost as we know it today.
Virtually 100% of the values from the aneroid device were within the 4–mm Hg range recommended by the Association for the Advancement of Medical Instrumentation. Conclusion Aneroid sphygmomanometers provide accurate pressure measurements when a proper maintenance protocol is followed.
Mercury BP-measuring devices should be calibrated at regular intervals. Failure to calibrate these devices my lead to errors in BP measurement.
