Sleep apnea: minor shortness of breath with serious consequences
“A constant, pounding noise disturbed Mr. Pickwick’s apartment. As soon as the door was opened, the figure of an exceptionally fat boy was seen standing with his eyes closed, as if asleep due to his calm and serene expression. When he asked him why he had come, he said nothing, but nodded once and seemed to be snoring lightly; Repeating the question three times produced no answer. As he was about to close the door, he opened his eyes abruptly, blinked several times, and raised his hand to knock again.”
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This brilliant staging by the writer Charles Dickens in Chapter 54 of his work The Posthumous Papers of the Pickwick Club went down in medical history as the first description of obstructive sleep apnea (OSA). Fat Joe, the chubby, pink, sleepy, slow-thinking (bradypsychic in medical terminology) fellow is great and summarizes the main clinical findings of this common disease.
Widespread but underdiagnosed: Although it is estimated to affect between 5% and 8% of the population, there are many cases that go unreported. And those affected can have serious consequences because other conditions (comorbidities) such as diabetes and cardiovascular diseases are associated with it.
And how can we know if we have OSA? We need to look out for these signs: heavy and irregular snoring alternating with pauses in breathing (apneas) due to airway collapse; sleep that is not restorative and is usually interrupted by multiple awakenings; excessive sleepiness during the day; slow to formulate thoughts and ideas as happened to Fat Joe; difficulty concentrating and memory; Headache, suffered chiefly in the morning; and nocturia, which is the need to get up several times during the night to urinate.
OSA and Obesity: The Chicken or the Egg?
Several epidemiological studies suggest a link between sleep disorders (including lack of rest) and obesity, which is one of the epidemics of the 21st century. Logically, OSA is the most common type of obesity related to sleep disorders.
But the relationship seems two-way. On the one hand, obese patients, particularly those suffering from so-called central-type obesity (with a pear-shaped or piriformis morphotype, such as Fat Joe), have OSA in a percentage exceeding 50%; On the other hand, 60-70% of people with OSA have this obesity problem, and those with insomnia are more likely to develop it.
This appears to be related to the hormonal and metabolic imbalance that causes sleep apnea. Because of these pauses in breathing, the production of leptin (hormone that creates satiety and increases thermogenesis, or heat production) decreases and that of ghrelin increases, which stimulates appetite and the formation of adipocytes, fat cells.
That is, under these circumstances, the brain establishes a procedure for saving energy, probably in the wrong way. In addition, there is an increase in the intake of foods rich in fat and sugar and a decrease in physical activity.
And as if that weren’t enough, the metabolism of patients with OSA can develop resistance to the effects of insulin, leading in many cases to diabetes mellitus.
vascular diseases
Another consequence of sleep apnea is the intermittent drop in blood oxygen levels caused by obstructive events. This leads to brain activation with micro-excitations in the brain, which we were able to observe in our studies in the sleep laboratory.
We somnologists interpret that these microexcitations, in which the individual does not become fully awake, represent a defense mechanism of the sleeping brain against an attack. Produced by the release of catecholamines (adrenaline), they increase the long-term risk of developing arterial hypertension, angina pectoris, myocardial infarction, stroke, sudden cardiac death…
It should be clear that early detection of OSA and effective treatment is a powerful weapon in preventing cardiovascular and cerebrovascular accidents. A simple nightly test at the patient’s home, such as a respiratory polygraph, can confirm or rule out the diagnosis.
Daytime sleepiness: risk of accidents
The poor quality of night’s sleep in patients with apnea has another fundamental connotation. Fragmented, superficial sleep with multiple micro-awakenings and brief awakenings – to which nocturia must be added – means that this sleep is not restorative, with consequent excessive daytime sleepiness.
The result is a low intellectual capacity with concentration, memory and problem-solving disorders, etc. And if these sleep attacks attack us while driving, there is a serious risk of suffering a traffic accident.
In fact, the Directorate-General for Traffic links daytime sleepiness to up to 30% of accidents. These are also usually the most serious, as they occur at high speed, without prior braking and in a frontal collision. Suffering from sleep apnea increases the risk of having a traffic accident by 3 to 7 times, an estimate that increases to 11 times when alcohol is also consumed.
OSA is also expected to increase the risk of accidents at home and at work. In the latter case, it increases by at least 50%, meaning that diagnosing and treating obstructive sleep apnea would prevent between 18,000 and 25,000 work-related accidents per year.
A mechanical device to remove the obstacle
And how can it be treated? The main technique against moderate or severe disease is based on the use of a night-time ventilation system with a compressor and a mask attached to it, blowing in purified air (CPAP-BIPAP machines). This puts positive pressure on the airway and allows the obstruction to be relieved during sleep. Some selected cases can also be resolved through surgery.
However, it should be noted that the best treatment for OSA is weight loss, adopting a healthy lifestyle, and following basic sleep hygiene rules.
Juan Jose Ortega Albas He is a specialist in clinical neurophysiology. Head of the Sleep Department of the General University Hospital of Castellón. Pisabius
This article was originally published on The Conversation. You can read the original here.
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