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Choice Vital Signs Monitor MD500B - User Guide

CHAPTER 3 User Guide

3.1. NIBP

3.1.1 Notices before Measurement

md500b(1)      Avoid eating, smoking, intensive activity 30 minutes before measurement.

(2)      Stay calm for 510minutes before measuring.

(3)      Please sit down while measuring. During measurement, please make sure the cuff stays at the same height as the heart. Either above or below the position, the accuracy will be affected.

(4)      If it is inconvenient for you to sit down, then you can try lying down measurement: lie on one�s back. Naturally place arm and hand straight, with palm upside. Keep the cuff at the same level of heart.

(5)      During measurement, do not speak or move body and arm.

(6)      During measurement, keep your comfortable, steady and quiet during measuring.

(7)      Between each measurement, you need 3 min to let blood circulation of the arm to recover.

(8)      The cuff size is suitable for adult�s wrist.

(9)      The man with arrhythmia is mot acceptable for this blood pressure monitor.

(10)   Please avoid strong magnetism interfere, such as mobile telephone, micro-wave oven, etc.

(11)   If you do not use the monitor for a long time, please take out the battery.

(12)   Please wear the cuff on left wrist.

3.1.2 Blood pressure:

 

The heart just like a pump works all times to make the blood flows through all blood pressure is the pressure on the wall of the blood vessel. As a result the blood pressure is the pressure on the wall of the blood vessel pressed by blood. The output of blood from the heart when it is at systole is called systole pressure. And the blood returning to heart when heart is at diastole is called diastolic pressure.

3.1.3 Fluctuation of Blood Pressure:

Blood pressure fluctuates constantly during the day. Its value in daytime is higher than in the evening. The lowest value is at midnight; blood pressure begins to rise again at 3:00 AM and will reach the highest level in daytime all the day. So it is impossible to measure the same result consistently.

 

 

 

There are many factors such as body circumstances or measuring problem that could influence the blood pressure. For example, someone will be nervous when seeing a doctor and that will make his pressure rise-called �white clothing hypertension�.

Accidental measurement can not indicate the whole blood level, so you need not be anxious for an isolated higher or lower pressure result. The most important thing is to master one�s own blood pressure trend through long-time measuring. In western countries, people measure their own pressure at home and give a report to the doctor so that they can get some useful judgment of high low pressure.

 

3.1.4 Average Values of normal Arterial Blood Pressure (mmHg)

You could obtain the basic evaluated value by measuring several days during the same time each day. The data is called �Basic Blood Pressure�.

 

Gender

Age

Male

Female

Systolic pressure

Diastolic pressure

Systolic pressure

Diastolic pressure

11-15

114

72

109

 

16-20

115

73

110

70

21-25

115

73

110

71

26-30

115

75

112

73

31-35

117

76

114

74

36-40

120

80

116

77

41-45

124

81

122

78

46-50

128

82

128

79

51-55

134

84

134

80

56-60

137

84

139

82

61-65

148

86

145

83

 

In the medical field, they use as standard a blood pressure classification chart of the World Health Organization. The standard has no relations with the age.

Note 1: Who undefined the minimum pressure, in this chart the area of minimum pressure is diastolic pressure 90mmHg.

Note 2: Because the blood pressure rises with age, this is only the reference for certain age.

 

 

 

3.1.5 Hypertension:

Various cardiovascular diseases, kindly diseases and endocrinopathy can cause hypertension.

Long term hypertension can also imitate pathological changes in heart, brain and kidney. These changes could lead to hypertension complication known as �Hidden Killers�.

 

 

 

Prompting:

Hypertension is one of the civilized diseases, and its pathogen is uncertain till today. The key problem is prevention of hypertension is its prevention. For example, eating less salt but more vegetables and fruits, not smoking and paying more attention to the balance of nutrition, etc.

3.1.6 LowBlood Pressure:

There are two kinds of minimum pressure:

a)       Standing Minimum pressure:

If you always feel dizzy, unsuitable in the chest and difficult to breathe or have occurrences of temporary myopia when standing up, these may mean that you have standing minimum pressure disease and should go to see doctor.

b)       Original Minimum pressure:

This disease is pure low pressure, which has no self symptom. To get rid of it, not only needs to pay more attention to one�s nutrition but also do move exercise.

3.2. SPO2

3.2.1 Description

Haemoglobin Saturation is percentage of Oxyhemoglobin (HbO2) capacity, compounded with oxygen, by all combinativable haemoglobin (Hb) obin (HbO2) capacity in blood. In other words, it is consistence of Oxyhemoglobin in blood. It is a very important ecological parameter for Respiratory circulation System. Many respiratory diseases can result in haemoglobin Saturation being lowered in human blood. Moreover, the following factors can also lead to problems in oxygen supply, so that human haemoglobin saturation might be reduced: Automatic Organic Regulation Malfunction caused by Anesthesia, Intensive Postoperative Trauma, hurts resulted in by some medical examination and etc. In the situation, illnesses, such as light head, asthenia, vomitory and etc, might happen to patients and even endanger the patient�s life. Therefore, it is very important to know Hemoglobin saturation of patient timely in clinical medical aspects. So that doctors can find problems in time.

It is only necessary for patient to put one of his fingers into a fingertip photoelectric sensor for diagnosis, and a display screen will directly show measured value of hemoglobin Saturation. It has been proved in clinical experiments that it features in rather high precise and repeatability.

3.2.2. Measurement principle

Principle of the SPO2 is as follows: An experience formula of data process is established taking use of Lambert Beer Law according to Spectrum Absorption Characteristics of Reductive hemoglobin(R Hb) and Oxyhemoglobin (O2 Hb) in red and near-infrared zones. Operation principle of the instrument is Photoelectric Oxyhemoglobin Inspection Technology is adopted in accordance with Capacity Pulse Scanning and Recording Technology, so that two beams of different wavelength of lights (660nm glow and 940nm near infrared light) can be focused onto human nail tip through perspective clamp finger-type sensor. Then measured signal can be obtained by a photosensitive element, information acquired through which will be shown on two groups of LEDs through process in electronic circuits and microprocessor.

 

3.2.3 Symbol Definitions

 

 

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