What are some complications of anesthesia if overweight?

Breathing Airway: More flesh in the pharynx (throat) may constrict and restrict the airway. Anesthesia relaxes the muscles that work to keep the airway open. Fat can also "absorb" the anesthesia, then slowly release it causing prolonged anesthesia.

Many: This is what we call a "board question" as many anesthesiologists are asked this question while taking their oral boards for certification. Obesity affects every organ system from respiratory to cardiac as well as how the meds are metabolized. Sometimes the airway is also "high risk" meaning that intubations could be difficult. A well trained and experienced anesthesiologist will be helpful.

Size: The overweight patient presents some specific challenges to anesthesiologists. Firstly the airway contains redundant tissue (fat) which can make breathing while sedated a challenge. The increase mass on the chest and abdomen increases pressure on the internal organs. This can affect everything from the heart to the kidneys and lungs. Th patient can have cardiac changes, decreased kidney perfusion.