Respiratory rate

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The respiration rate is the number of breaths a person takes per minute.

There is only limited research relating to monitoring respiratory rate, and these studies focused on issues such as the inaccuracy of respiratory rate measurement and respiratory rate as a marker for respiratory dysfunction.

1 Measurement
2 Normal findings
3 Optimum Breathing
4 Minute Volume
5 Diagnostic value
6 See also
7 References

[edit] Measurement

The rate is usually measured when a person is at rest and simply involves counting the number of breaths for one minute by counting how many times the chest rises. Respiration rates may increase with fever, illness, and with other medical conditions. When checking respiration, it is important to also note whether a person has any difficulty breathing.

Inaccuracies in respiratory measurement have been reported in the literature. One study compared respiratory rate counted using a 15 second count period, to a full minute, and found significant differences in the rates.^{[citation needed]} Respiratory rates measurement in children under five years, for a 30 second or 60 second period, suggesting the 60 seconds resulted in the least variability. Another study found that rapid respiratory rates in babies, counted using a stethoscope, were 20% to 50% higher than those counted from beside the cot without the aid of the stethoscope.^{[citation needed]}

[edit] Normal findings

Normal respiratory rate reported in a healthy adult varies from source to source: between 12 to 20 breaths per minute^[1], between 10-14,^[2], between 14-18^[3], etc. (With such a slow rate, it is best to count the number of breaths over a full minute for accuracy.)

[edit] Optimum Breathing

In May 2004, the International Breathing Institute found that deep breathing lowered respiration rates in cardiac patients, helping them to maintain healthy blood oxygen levels and become more physically fit. The study established an optimum healthy breathing rate of six breaths per minute.

In a follow-up study, 15 cardiac patients were assigned to one of two experimental groups. One of the groups learned "complete yoga breathing," a style of respiration that encourages slow, deep breathing at a rate of about six breaths per minute. Those patients continued practicing the breathing method at home for an hour a day. After a month, the patients practicing the breathing technique breathed more slowly, had higher levels of blood oxygen, and performed better on exercise tests. ^[4]

Average respiratory rates, by age:

Newborns: Average 44 breaths per minute
Infants: 20-40 breaths per minute
Preschool children: 20-30 breaths per minute
Older children: 16-25 breaths per minute
Adults: 12 to 20 breaths per minute

[edit] Minute Volume

Respiratory minute volume is the volume of air which can be inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute.

[edit] Diagnostic value

The value of respiratory rate as an indicator of potential respiratory dysfunction has been investigated but findings suggest it is of limited value.

One study found that only 33% of people presenting to an emergency department with an oxygen saturation below 90% had an increased respiratory rate.^{[citation needed]} An evaluation of respiratory rate for the differentiation of the severity of illness in babies under 6 months found it not to be very useful. Approximately half of the babies had a respiratory rate above 50 breaths per minute, thereby questioning the value of having a "cut-off" at 50 breaths per minute as the indicator of serious respiratory illness.

It has also been reported that factors such as crying, sleeping, agitation and age have a significant influence on the respiratory rate.^{[citation needed]} As a result of these and similar studies the value of respiratory rate as an indicator of serious illness is limited.