neuropsychological

What is Lewy body dementia (LBD)?

Lewy body dementia (LBD) is one of the most common types of dementia in older adults. Dementia is a loss of mental functions that is severe enough to affect your daily life and activities. These functions include:

• Memory
• Language skills
• Visual perception (your ability to make sense of what you see)
• Problem solving
• Trouble with everyday tasks
• The ability to focus and pay attention

What are the types of Lewy body dementia (LBD)?

There are two types of LBD: dementia with Lewy bodies and Parkinson's disease dementia.

Both types cause the same changes in the brain. And, over time, they can cause similar symptoms. The main difference is in when the cognitive (thinking) and movement symptoms start.

Dementia with Lewy bodies causes problems with thinking ability that seem similar to Alzheimer's disease. Later, it also causes other symptoms, such as movement symptoms, visual hallucinations, and certain sleep disorders. It also causes more trouble with mental activities than with memory.

Parkinson's disease dementia starts as a movement disorder. It first causes the symptoms of Parkinson's disease: slowed movement, muscle stiffness, tremor, and a shuffling walk. Later on, it causes dementia.

What causes Lewy body dementia (LBD)?

LBD happens when Lewy bodies build up in parts of the brain that control memory, thinking, and movement. Lewy bodies are abnormal deposits of a protein called alpha-synuclein. Researchers don't know exactly why these deposits form. But they do know that other diseases, such as Parkinson's disease, also involve a build-up of that protein.

Who is at risk for Lewy body dementia (LBD)?

The biggest risk factor for LBD is age; most people who get it are over age 50. People who have a family history of LBD are also at higher risk.

What are the symptoms of Lewy body dementia (LBD)?

LBD is a progressive disease. This means that the symptoms start slowly and get worse over time. The most common symptoms include changes in cognition, movement, sleep, and behavior:

• Dementia, which is a loss of mental functions that is severe enough to affect your daily life and activities
• Changes in concentration, attention, alertness, and wakefulness. These changes usually happen from day to day. But sometimes they can also happen throughout the same day.
• Visual hallucinations, which means seeing things that are not there
• Problems with movement and posture, including slowness of movement, difficulty walking, and muscle stiffness. These are called parkinsonian motor symptoms.
• REM sleep behavior disorder, a condition in which a person seems to act out dreams. It may include vivid dreaming, talking in one's sleep, violent movements, or falling out of bed. This may be the earliest symptom of LBD in some people. It can appear several years before any other LBD symptoms.
• Changes in behavior and mood, such as depression, anxiety, and apathy (a lack of interest in normal daily activities or events)

In the early stages of LBD, symptoms can be mild, and people can function fairly normally. As the disease gets worse, people with LBD need more help due to problems with thinking and movement. In the later stages of the disease, they often cannot care for themselves.

How is Lewy body dementia (LBD) diagnosed?

There isn't one test that can diagnose LBD. It is important to see an experienced doctor to get a diagnosis. This would usually be specialist such as a neurologist. The doctor will:

• Do a medical history, including taking a detailed account of the symptoms. The doctor will talk to both the patient and caregivers.
• Do physical and neurological exams
• Do tests to rule out other conditions that could cause similar symptoms. These could include blood tests and brain imaging tests.
• Do neuropsychological tests to evaluate memory and other cognitive functions

LBD can be hard to diagnose, because Parkinson's disease and Alzheimer's disease cause similar symptoms. Scientists think that Lewy body disease might be related to these diseases, or that they sometimes happen together.

It's also important to know which type of LBD a person has, so the doctor can treat that type's particular symptoms. It also helps the doctor understand how the disease will affect the person over time. The doctor makes a diagnosis based on when certain symptoms start:

• If cognitive symptoms start within a year of movement problems, the diagnosis is dementia with Lewy bodies
• If cognitive problems start more than a year after the movement problems, the diagnosis is Parkinson's disease dementia

What are the treatments for Lewy body dementia (LBD)?

There is no cure for LBD, but treatments can help with the symptoms:

• Medicines may help with some of the cognitive, movement, and psychiatric symptoms
• Physical therapy can help with movement problems
• Occupational therapy may help find ways to more easily do everyday activities
• Speech therapy may help with swallowing difficulties and trouble speaking loudly and clearly
• Mental health counseling can help people with LBD and their families learn how to manage difficult emotions and behaviors. It can also help them plan for the future.
• Music or art therapy may reduce anxiety and improve well-being

Support groups can also be helpful for people with LBD and their caregivers. Support groups can give emotional and social support. They are also a place where people can share tips about how to deal with day-to-day challenges.

NIH: National Institute of Neurological Disorders and Stroke

What is traumatic brain injury (TBI)?

Traumatic brain injury (TBI) is a sudden injury that causes damage to the brain. It may happen when there is a blow, bump, or jolt to the head. This is a closed head injury. A TBI can also happen when an object penetrates the skull. This is a penetrating injury.

Symptoms of a TBI can be mild, moderate, or severe. Concussions are a type of mild TBI. The effects of a concussion can sometimes be serious, but most people completely recover in time. More severe TBI can lead to serious physical and psychological symptoms, coma, and even death.

What causes traumatic brain injury (TBI)?

The main causes of TBI depend on the type of head injury:

• Some of the common causes of a closed head injury include
  • Falls. This is the most common cause in adults age 65 and older.
  • Motor vehicle crashes. This is the most common cause in young adults.
  • Sports injuries
  • Being struck by an object
  • Child abuse. This is the most common cause in children under age 4.
  • Blast injuries due to explosions
• Some of the common causes of a penetrating injury include
  • Being hit by a bullet or shrapnel
  • Being hit by a weapon such as a hammer, knife, or baseball bat
  • A head injury that causes a bone fragment to penetrate the skull

Some accidents such as explosions, natural disasters, or other extreme events can cause both closed and penetrating TBI in the same person.

Who is at risk for traumatic brain injury (TBI)?

Certain groups are at higher risk of TBI:

• Men are more likely to get a TBI than women. They are also more likely to have serious TBI.
• Adults aged 65 and older are at the greatest risk for being hospitalized and dying from a TBI

What are the symptoms of traumatic brain injury (TBI)?

The symptoms of TBI depend on the type of injury and how serious the brain damage is.

The symptoms of mild TBI can include:

• A brief loss of consciousness in some cases. However, many people with mild TBI remain conscious after the injury.
• Headache
• Confusion
• Lightheadedness
• Dizziness
• Blurred vision or tired eyes
• Ringing in the ears
• Bad taste in the mouth
• Fatigue or lethargy
• A change in sleep patterns
• Behavioral or mood changes
• Trouble with memory, concentration, attention, or thinking

If you have a moderate or severe TBI, you may have those same symptoms. You may also have other symptoms such as:

• A headache that gets worse or does not go away
• Repeated vomiting or nausea
• Convulsions or seizures
• Not being able to wake up from sleep
• Larger than normal pupil (dark center) of one or both eyes. This is called dilation of the pupil.
• Slurred speech
• Weakness or numbness in the arms and legs
• Loss of coordination
• Increased confusion, restlessness, or agitation

How is traumatic brain injury (TBI) diagnosed?

If you have a head injury or other trauma that may have caused a TBI, you need to get medical care as soon as possible. To make a diagnosis, your health care provider:

• Will ask about your symptoms and the details of your injury
• Will do a neurologic exam
• May do imaging tests, such as a CT scan or MRI
• May use a tool such as the Glasgow coma scale to determine how severe the TBI is. This scale measures your ability to open your eyes, speak, and move.
• May do neuropsychological tests to check how your brain is functioning

What are the treatments for traumatic brain injury (TBI)?

The treatments for TBI depend on many factors, including the size, severity, and location of the brain injury.

For mild TBI, the main treatment is rest. If you have a headache, you can try taking over-the-counter pain relievers. It is important to follow your health care provider's instructions for complete rest and a gradual return to your normal activities. If you start doing too much too soon, it may take longer to recover. Contact your provider if your symptoms are not getting better or if you have new symptoms.

For moderate to severe TBI, the first thing health care providers will do is stabilize you to prevent further injury. They will manage your blood pressure, check the pressure inside your skull, and make sure that there is enough blood and oxygen getting to your brain.

Once you are stable, the treatments may include:

• Surgery to reduce additional damage to your brain, for example to
  • Remove hematomas (clotted blood)
  • Get rid of damaged or dead brain tissue
  • Repair skull fractures
  • Relieve pressure in the skull
• Medicines to treat the symptoms of TBI and to lower some of the risks associated with it, such as
  • Anti-anxiety medication to lessen feelings of nervousness and fear
  • Anticoagulants to prevent blood clots
  • Anticonvulsants to prevent seizures
  • Antidepressants to treat symptoms of depression and mood instability
  • Muscle relaxants to reduce muscle spasms
  • Stimulants to increase alertness and attention
• Rehabilitation therapies, which can include therapies for physical, emotional, and cognitive difficulties:
  • Physical therapy, to build physical strength, coordination, and flexibility
  • Occupational therapy, to help you learn or relearn how to perform daily tasks, such as getting dressed, cooking, and bathing
  • Speech therapy, to help you to with speech and other communication skills and treat swallowing disorders
  • Psychological counseling, to help you learn coping skills, work on relationships, and improve your emotional well-being
  • Vocational counseling, which focuses on your ability to return to work and deal with workplace challenges
  • Cognitive therapy, to improve your memory, attention, perception, learning, planning, and judgment

Some people with TBI may have permanent disabilities. A TBI can also put you at risk for other health problems such as anxiety, depression, and post-traumatic stress disorder. Treating these problems can improve your quality of life.

Can traumatic brain injury (TBI) be prevented?

There are steps you can take to prevent head injuries and TBIs:

• Always wear your seatbelt and use car seats and booster seats for children
• Never drive under the influence of drugs or alcohol
• Wear a properly fitting helmet when riding a bicycle, skateboarding, and playing sports like hockey and football
• Prevent falls by
  • Making your house safer. For example, you can install railings on the stairs and grab bars in the tub, get rid of tripping hazards, and use window guards and stair safety gates for young children.
  • Improving your balance and strength with regular physical activity