Obstructive sleep apnea (OSA) is a dysfunction that negatively impacts many elements of the physique. Medical situations linked to OSA embody hypertension, insulin resistance, visceral fats deposition, and systemic irritation.
Sleep apnea is believed to affect 25% of the grownup inhabitants and as excessive as 45% of people with weight problems.
Weight problems is a significant danger issue for the event and development of OSA, and it’s the solely reversible danger issue. About 70% of grownup OSA sufferers have weight problems, and the upper the BMI, the better the prevalence. The prevalence of sleep apnea can be significant within the pediatric inhabitants. Kids with weight problems have a 46% elevated danger of OSA in comparison with their normal-weight friends.
Sufferers with gentle OSA who acquire 10% of their physique weight are at a six-fold danger of illness development. Conversely, a 10% weight reduction correlates with a 20% enchancment in OSA severity. Weight problems could worsen OSA due to fats deposition in tissues of the higher airway, leading to a smaller lumen and elevated collapsibility, and within the thorax, lowering chest compliance and practical residual capability.
Obstructive sleep apnea is related to glucose intolerance and insulin resistance. Lipid abnormalities related to OSA embody excessive triglycerides and low HDL. OSA additionally alters hormones associated with weight problems. Ghrelin, an urge for food stimulant, is increased in sufferers with OSA. Leptin is a hormone produced by adipose tissue capabilities within the hypothalamus to sign satiety to the mind. Sleep deprivation tends to inhibit leptin manufacturing, a potential cause that poor sleep could contribute to weight problems. Adiponectin is one other adipokine that improves glucose management and lipid metabolism and should scale back irritation and atherosclerosis. Ranges of adiponectin are diminished in each weight problems and obstructive sleep apnea.
Therapy of OSA with CPAP (Steady Optimistic Airway Strain) has proven advantages in reducing blood stress and bettering high quality of life. It might additionally enhance a few of the cardio-metabolic problems of OSA. In a trial of 86 sufferers with metabolic syndrome and OSA randomised to therapy with CPAP and “sham” CPAP, three-month outcomes confirmed the partial reversal of metabolic abnormalities and diminished blood stress within the CPAP group (Sharma et al., NEJM Dec 15, 2011).
CPAP mixed with weight reduction confirmed discount in insulin resistance, triglyceride ranges, and blood stress (Chirinor et al., NEJM June 12, 2014).
In the abstract, there’s a complicated relationship between weight problems and obstructive sleep apnea. It ought to be thought-about in sufferers with weight problems. Shedding weight can enhance OSA, and treating OSA could assist with weight reduction. Hopefully, the continued analysis will make clear this interrelationship and result in improved therapies for each situation.
