My mother, currently rehospitalised for 3 weeks (2 in icu) brought in delirious, rexovered in icu and in ward delirious again. what would be appropriate investigations/interventions. copd, chf, mitochondrial disease and hypertention plus depression?

Many conditions : Ensure stable vital signs, a work up for neurologic conditions including encephalitis and stroke seems appropriate. A head CT scan may provide additional information.

Wrong place to ask: The complexity of this case would require a full review of past & current medical status, exam and testing. This information is available to the people doing the treatment. This site is here to offer aid on general health issues where a direct exam/tests are not needed. You need to schedule a conference with the treatment team to understand the process & approach to her care.