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Monitoring the activity of the human body
Transcript of Monitoring the activity of the human body
Peak flow meters must be regularly cleaned to prevent fungal contamination.
Forced exhalation into a peak flow meter may cause some asthmatics to suffer an attack.
Inaccurate measurements may promote over medication.
Over-reliance on peak flow meters may lead to a delay in seeking medical treatment. There are some health and safety issues surrounding the use of a spirometer.
Unless a supply of oxygen is piped in and carbon dioxide removed only a few breaths can be taken safely. This is because the box becomes depleted of oxygen and filled with carbon dioxide.
The mouthpiece must be disinfected between users or a disposable mouthpiece used. Monitoring the respiratory system Measuring peak flow
Peak flow measures the maximum speed of exhalation.
Peak flow meters can be used by people with asthma, chronic bronchitis and emphysema to monitor their condition and the effectiveness of treatment.
Normal values are between 400-600 dm3/min. The pulmonary ventilation is the volume of air taken in each minute.
Pulmonary ventilation = Tidal volume X Breathing rate
The normal breathing rate is 15-18 breaths per minute.
Calculate the pulmonary ventilation if the tidal volume is 500 cm3 and the breathing rate is 15 breaths per minute. A typical spirometer trace We can measure the volume of air inhaled and exhaled using a spirometer.
The diagram shows how a simple spirometer works. Our spirometer uses the same principle but you get less wet! The tidal volume is the amount of air taken in during one breath. At rest normal values are between 0.4–0.5 dm3. The tidal volume rises during exercise. Tidal volume This is the maximum volume of air that can be exhaled after a maximum inhalation. It varies due to health and chest size. Normal values are 6.00 dm3 for males and 4.25 dm3 for females. Vital capacity