Mesh : Adjuvants, Anesthesia / adverse effects Adult Anesthesia, Inhalation / methods nursing Anesthesia, Intravenous / methods nursing Anesthetics, Inhalation / adverse effects Atropine / therapeutic use Cholinesterase Inhibitors / adverse effects Desflurane Dexmedetomidine / adverse effects Droperidol / adverse effects Drug Monitoring / nursing Electrocardiography Female Gastric Bypass Heart Block / chemically induced diagnosis drug therapy Humans Hypnotics and Sedatives / adverse effects Indoles / adverse effects Isoflurane / adverse effects analogs & derivatives Long QT Syndrome / chemically induced diagnosis etiology Muscarinic Antagonists / therapeutic use Neostigmine / adverse effects Nurse Anesthetists Obesity, Morbid / complications surgery Quinolizines / adverse effects Risk Factors Serotonin Antagonists / adverse effects