Dementia: Symptoms, Causes, and PET-CT Insights

Developing symptoms of dementia early can help to get medical counsel regarding it and suitable care. Dementia can present due to various different diseases. The cutting-edge imaging modalities available at Molecular Diagnostics and Therapy, such as PET-CT (if appropriate), can help the physician investigate a limited number of neurological diseases. However, a full medical investigation is required to diagnose dementia.

Dementia Symptoms

Symptoms can vary from mild to severe depending on the cause and area of the brain affected. Common symptoms include:

• Memory loss: Forgetting recent information, repeating questions, or missing appointments.

• Difficulty planning: Struggling with familiar tasks, finances, or decision-making.

• Language problems: Finding it difficult to express thoughts or understand conversations.

• Disorientation: Becoming confused about dates, time, or familiar places.

• Behavioural changes: Experiencing anxiety, irritability, apathy, or personality changes.

• Reduced independence: Finding routine activities increasingly challenging.

Dementia Causes and Risk Factors

The causes of dementia depend on the disease of the brain. The most common cause is the development of abnormal protein changes, which cause harm to the cells and connections in the brain; this is a characteristic of Alzheimer's disease. Damage to blood vessels in the brain, Lewy body disease, and degeneration of the frontotemporal regions can also contribute to this. In some people, there is a combination (mixed) of two or more types of dementia.

Raised blood pressure, family history, diabetes, smoking, lack of physical activity, hearing loss, high cholesterol, and a previous stroke are all risk factors. Dementia is not an inevitable part of ageing; however, it can be more common as we age. Cognitive symptoms can also be caused by a lack of certain vitamins, thyroid issues, depression, sleeping issues and some medications. If there is a risk of this being the cause of the symptoms, a medical investigation can be carried out.

How Is Dementia Diagnosed?

A patient would usually be investigated with a medical history, neurological examination, and cognitive/memory tests. Family members would be asked about any changes in behaviour or function. Blood tests can be used to make a diagnosis for certain deficiencies (vitamin D, vitamin B12, thyroid) and find other issues. MRI’s and/or CT scans may be carried out to look for any brain damage from previous strokes and other causes of cognitive issues. Further investigations may be suggested if a diagnosis cannot be made. The symptoms and medical history can help decide what investigations to carry out.

PET-CT for Dementia: What Does It Show?

A PET-CT scan combines Positron Emission Tomography (PET) and Computed Tomography (CT). PET uses a radiotracer to show biological activity whilst CT provides anatomical images. Information gained depends on the tracer used. Fluorodeoxyglucose (FDG) is used in brain PET imaging to assess the patterns of glucose utilization. A pattern may be formed by various neurological disorders and provide physicians a basis for exploring some potential causes behind cognitive loss.

Where clinically indicated and available, specialist PET tracers can be used to assess certain features such as amyloid/tau deposition. These assays will vary depending on what is being investigated. Not all patients will require a PET-CT scan to diagnose dementia. However, if there is still uncertainty following initial investigations, a PET-CT scan can be used to see if there may be further findings that may indicate something different. The results should be interpreted based on the symptoms, standard cognitive tests, medical history, and further investigations.

Molecular Diagnostics and Therapy, and diagnostic imaging, can help doctors investigate certain neurological diseases. If the patient would like to have a PET scan, they should discuss this with their doctor/neurologist to see if they would be advised to have one.

Conclusion

Memory, cognitive abilities, behaviour and daily living abilities may be affected by dementia. Early recognition of symptoms and medical investigations can help to determine the cause. Important aspects of diagnosis include a clinical assessment, cognitive tests, lab investigations and structural imaging. A PET scan can sometimes give additional details about any abnormal biological activity or some of the changes caused by the condition.

PET-CT should be advised if appropriate, and the results should be included in a full mega-brain assessment. Molecular Diagnostics and Therapy can provide diagnostic imaging services which may help investigate certain neurological diseases. If there are ongoing memory issues, they should see a health care expert.