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In fact, prior to the invention of artificial light and electronic devices, our circadian rhythms were influenced entirely by the sun. Your circadian rhythm affects a number of biological processes including your sleep-wake cycle, your immune system, as well as your physical and mental health.Įxposure to light is the most important external factor that influences a person’s circadian rhythm. Our circadian rhythms are controlled by a part of our brains called the Suprachiasmatic Nucleus (SCN). Circadian rhythms are affected by one’s biological clock, and can change seasonally as the environment does, or adapt to our bodies’ needs as we age. However, circadian rhythms aren’t the same thing as a biological clock- rather, biological clocks are an organism’s “natural timing devices,” which regulate the cycles of circadian rhythms. Circadian rhythms aren’t just present in people- they exist in all types of organisms, from people to animals, and even plants and microbes. Before we get into that though, let’s dive into what the circadian rhythm is, and why it’s important to how you function.Ī circadian rhythm is a 24-hour cycle that your body perpetuates, which helps your body work properly. Of course, there’s a lot more to your circadian rhythm than waking you up and helping you sleep- like other areas of our body, it’s possible and not uncommon for our circadian rhythms to be in disorder, which can cause problems day or night. This internal clock helps your body wake up and function properly throughout the day before winding down for sleep each night. Similar to how you follow a certain schedule during the day, your circadian rhythm does as well.
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You probably hear a lot about your circadian rhythm and how it helps you sleep, but you may not be familiar with what it actually is or how it works. You may not realize it, but our bodies are the same- they follow a biological rhythm that gets us through each day called the circadian rhythm. Afterward, you probably try to relax and wind down for the day before you go to bed. Maybe you exercise or take a shower right after you wake up, get dressed, get coffee, then start work.
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They are a vital piece of hospital equipment, which remains worryingly scarce in low-resource countries.Ĭlick here to download specifications of the pulse oximeter supplied through Lifebox®.We all have our unique routines and rhythms that help us get through our day. Pulse oximeters were rapidly adopted by anaesthesiologists as the universal standard of care in operating theatres, emergency, recovery and neonatal units and all wards (especially in paediatric wards). Oximeters are used in the treatment of pneumonia they can be used to prevent neonatal blindness – they are a key component of the WHO Safe Surgery Checklist.
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Before oximeters, clinicians would only notice signs of hypoxia (oxygen starvation) when patients’ skin literally began turning blue, with oxygen saturation at about 85%. Oximeters can detect changes as small as 1%. Brain damage and heart failure can occur after as little as three minutes of oxygen starvation, and so early detection is critical.Ī healthy body should never fall below 95% oxygen saturation. The oximeter sounds a warning alarm as soon as it detects any change in the level of oxygen of patients under anaesthesia. By calculating the absorption by haemoglobin in the patient’s blood stream at these two different wavelengths, the oximeter can calculate the level of oxygenation present. Deoxygenated haemoglobin absorbs a greater amount of red light while allowing more infrared light to pass through. Oxygenated haemoglobin absorbs a greater amount of infrared light while allowing more red light to pass through. Opposite the emitter is a photodetector which receives and measures these streams of light as they pass through. Inside the probe is a light emitter that sends out two streams of light: one red and one infrared. Though they became widespread in the 1980s, oxygen monitors have historical precedence: an 18th century principle known as Beer’s Law, which found that different frequencies of light are absorbed in different volumes.Ī small probe, attached to a separate computerized unit, is clipped to a spot on the body with good blood flow – typically the finger or the earlobe. It is a non-invasive medical device that checks the level of oxygen in a patient’s bloodstream and sounds an alarm as soon as it detects the slightest unsafe change. A pulse oximeter is the most important monitoring tool in modern anaesthesia practice.