Alzheimer's disease and senile dementia

In Switzerland, 150,000 people suffer from senile dementia or Alzheimer's disease. And every 18 minutes, a new case of senile dementia is diagnosed. When age and disease attack the memory, it's all relationships, family and loved ones, that are turned upside down. How do we manage these situations? How can we support a loved one suffering from Alzheimer's while preserving his or her dignity?