my husband had dementia MRI showed microvascular ischemia which with further investigation was linked to marijuana use. when he stopped the dementia stopped.now he had his teeth pulled and has been on pain meds and the dementia has returned. dementia happens when he is NOT under the influence of drugs. Also he had a head ache that doctors attribute to a "mini stroke" just prior to the dementia's return. I realize ischemia is causing the symptoms but could pain medicine be triggering the ischemia? I too am a nurse.