92 year old woman presented with acute onset of confusion. Exam showed a fever of 38.2 degrees C, mild dehydration and confusion. Previously well and independent with all ADLs and IADLs.

Which one of the 3D's is this? What supports this diagnosis?

67 year old woman with chronic weight loss and complaints of memory loss. Also reports difficulty sleeping. Cognitive exam shows oriented, good naming skills but limited responses to questions.

Which one of the 3D's is this? What supports this diagnosis?

85 year old woman with recent hip fracture and difficulty participating in rehabilitation. Physical exam normal. Cognitive testing shows poor short term memory and naming skills. Family reports a slow decline of a year.

Which one of the 3D's is this? What supports this diagnosis?