A breath rate monitor is a device that records an individual’s inhalation and exhalation rates. The device is used for different purposes such as sports performance, medical diagnosis and treatment, or meditation. The main difference between respiratory rate monitors and pulse oximeters is that respiratory monitors measure breaths at a single point, whereas the latter measures oxygen saturation at several points.
The breath rate monitor is typically used as a feedback mechanism to help patients control their breathing rates. Such devices are also used in sports training such as swimming, running, and yoga. An athlete can use the device to learn techniques that will enable them to achieve better results during their performance.
Different types:
These devices usually measure pulse transit time at one or more finger locations (e.g., Left index finger, right index finger, left thumb). Some devices count pulses from both wrists simultaneously. In contrast, others take readings from only one wrist at a time, with additional measurements taken from the other wrist shortly after that (typically 5 seconds later).
The most common function of pulse oximetry in medical settings is to monitor blood oxygen saturation levels non-invasively using an infra-red light source, a sensitive photodetector, and electronic circuitry. Pulse oximeters are used in hospitals and outpatient care facilities to continuously monitor patients’ oxygenation (SaO2), haemoglobin concentration (SpHb), and heart rate during surgery or critical care.
A wristband makes this information accessible at the touch of a button so that changes in patient status can be detected quickly by health professionals attending to the patient. It is generally recommended that pulse oximeter reading be used with clinically observed indicators to determine overall patient status.
How are they used:
Respiratory monitors are also used for the noninvasive measurement of carbon dioxide (CO) levels in the blood and other body fluids to diagnose many different types of disease, most notably sleep apnea. In addition to monitoring PaCO2, respiratory monitors can be used to treat certain diseases like heart failure by instructing patients on how to control their breathing patterns.
These devices are more effective at detecting sleep apnea when attached around the chest rather than over the finger, and these are considered less painful due to their attachment location.
External devices are marketed both as medical and consumer products, but there is a concern in the scientific community about their accuracy. The FDA website warns that: “Breathlessness is not a good indicator of hypercapnia (elevated carbon dioxide levels). It can be normal to feel breathless at high levels of PaCO2, especially when exerting oneself.”
They also note that “Some portable monitors do not accurately measure blood oxygen saturation”. Oximeters have been found to give 0.1-5% readings different from those on a conventional oximeter, and different manufacturers’ oximeters have shown variation between each other up to 10%. In addition, many of these devices require an individual’s hands or arm(s) to remain perfectly still, which is often difficult to achieve when using them for sleep apnea patients. Users may cover the optical sensors with their hands, move their fingers or arms into a more comfortable position (rather than being perfectly still), disrupt the flow of air under the sensor(s) if they are snoring loudly, or fail to stick the monitor device in place properly so that it moves around.
They need to be used with care:
Respiratory monitors have not been found to provide any greater benefits over just clinical observation and patient-reported symptoms. Studies have shown no significant difference between monitoring induced changes in oxygen saturation instead of simply monitoring clinically observed status.
These devices provide an output indicating how much CO has accumulated during inhalation room air and an output indicating the partial pressure of CO in each breath. These devices are most often used for statistical calculations during research and for monitoring patients with heart disease or those who have previously had a heart attack.