<qa>  What is the name of the psychiatric disorder that prohibits obtaining informed consent6. Patients with unstable or serious concurrent medical conditions are excluded. Examples include, but are not limited to, uncontrolled ventricular arrhythmia, recent within 3 months myocardial infarction, uncontrolled major seizure disorder, spinal cord compression, superior vena cava syndrome, or any psychiatric disorder that prohibits obtaining informed consent. 