Why do obese patients desaturate faster?

Can obesity cause oxygen desaturation?

Rationale: Obesity increases the risk and severity of sleep-disordered breathing. The degree to which excess body weight contributes to blood oxygen desaturation during hypopneic and apneic events has not been comprehensively characterized.

How does obesity affect blood volume?

Blood volume increases with obesity, although to a lesser extent than body weight and volume. This is because the increase in body size is mostly adipose tissue, which is relatively under-perfused when compared to lean mass.

Why do obese people need more oxygen?

The additional weight around the chest and the pressure on the diaphragm prevent full lung expansion. Additional weight on a person also means more oxygen is required to support the extra body mass.

How does obesity affect anesthesia?

One of the biggest concerns is that being overweight makes you more likely to have a condition called sleep apnea, which causes you to temporarily stop breathing while you sleep. This can make anesthesia riskier, especially general anesthesia, which causes you to lose consciousness.

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Does obesity affect pulse oximetry?

Obesity was a strong independent contributor to a low SpO2, with effects comparable to or greater than other factors clinically associated with lower SpO2.

Does weight affect oxygen saturation?

Obesity Is Associated With a Lower Resting Oxygen Saturation in the Ambulatory Elderly: Results From the Cardiovascular Health Study.

Why does heart load increase in obesity?

The increased cardiac output in obese patients is to meet the metabolic demand of the excess adipose tissue. Although the heart rate is higher in obese individuals due to increased sympathetic activation, the increased cardiac output is related to an increase in stroke volume.

How does obesity affect cardiac output?

Cardiac output is often higher in obesity, due to an augmented stroke volume and an increase in heart rate. Ventricular systolic function as assessed by ejection fraction or with load independent measures such as mid wall fractional shortening is usually normal in obesity.

How does obesity or excessive fat impair our energy and cardiovascular systems ability to function?

Obesity has an important role in atherosclerosis and coronary artery disease. Obesity leads to structural and functional changes of the heart, which causes heart failure. The altered myocardial structure increases the risk of atrial fibrillation and sudden cardiac death.

Do obese people use more oxygen?

In fact, because of their much higher metabolism — in relation to their low body weight — they breathe more air per kilogram of weight than obese adults do to maintain their basic functions and perform their daily activities.

Does obesity affect breathing?

Obesity can lead to changes in the way you breathe. With weight gain, fat tends to accumulate around your neck and abdomen, placing greater pressure on your breathing muscles. This fat, called adipose tissue, also releases hormones called cytokines that are linked to inflammation.

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How does weight affect breathing rate?

Obesity causes mechanical compression of the diaphragm, lungs, and chest cavity, which can lead to restrictive pulmonary damage. Furthermore, excess fat decreases total respiratory system compliance, increases pulmonary resistance, and reduces respiratory muscle strength.

How does obesity affect pharmacokinetics?

Pharmacokinetic changes in obese patients. Effect on absorption: Gastric emptying may be increased OR decreased (and it is unpredictable). Absorption from the subcutaneous compartment will be slowed due to poor blood flow to subcutaneous fat.

How does obesity complicate surgery?

In addition, obesity has a great impact on surgical diseases, and elective surgeries in comparison to general population. There is higher risk for wound infection, longer operative time, poorer outcome, and others. The higher the BMI (body mass index), the higher the risk for these complications.

Why can’t obese people get surgery?

“When you carry extra weight, the impact is on quite a few different levels,” Morton says, explaining that fat flaps can be tough to work around, anesthesia breathing tubes are harder to put in, and high blood sugar levels and inflammation make patients more prone to surgical site infections.