apr 2

Initial Symptoms
  - Tremor:
    - Often begins as a light tremor, primarily starting on the right side of the body, particularly in the hand.
    - Over time, the tremor may spread to the arm and leg, ultimately becoming bilateral (affecting both sides of the body).
Progression:
- Tremors may evolve into severe rigidity, which can become so intense that the individual may experience freezing episodes where they cannot move at all. - Individuals may develop a masked face appearance, characterized by non-emotional, rigid facial muscles that resemble a mask. - Shuffling gait is indicative of advanced Parkinson's, notably in older individuals.
Shuffling Gait Phenomenon:
  - Phenomenon related to patterned flooring, e.g., a checkered floor transitioning to a solid carpet.
    - Individuals may find it difficult to initiate steps once they reach the carpet due to a discontinuity in texture and pattern.   - Research utilized augmented reality glasses to simulate checkered patterns on continuous surfaces, allowing subjects to keep moving effectively.
  - The reason for this remains unexplained, occurring primarily in severely advanced cases of Parkinson's.

Biking vs. Walking:
- Individuals with severe difficulty walking due to Parkinson's can sometimes ride a bicycle without issues, indicating a different neural pathway for well-rehearsed movements.
Cerebellum's Role:
- The cerebellum typically remains intact in Parkinson's, suggesting that rigidities and tremors aren't rooted in cerebellar dysfunction but possibly other areas of the brain.

Core Symptoms:
  - Neurologists historically looked for these four hallmark symptoms: tremor, rigidity, bradykinesia (slowness of movement), and postural instability.
  - The reality is complex; individuals may present with varied combinations of symptoms, including:
    - Rigidity without tremor
    - Tremor without rigidity
    - Instability or a mixture of symptoms.
Non-Motor Symptoms:
- Recognition of non-motor symptoms is becoming more prominent. These include:
- Gastrointestinal issues: Causes and effects are still under investigation. - Sleep disturbances: Sleep quality issues, particularly with REM sleep behavior disorder. - Eye movement abnormalities: Studied at UBC focusing on their changes before motor symptoms appear. - Depression and anxiety: Commonly seen alongside motor symptoms, warranting holistic treatment approaches. - Non-motor symptoms like hypotension, anosmia (loss of smell), and hyposmia can present years before motor symptoms.
Hallucinations:
- Often overlooked, hallucinations can occur in over 10% of Parkinson's patients, commonly manifesting as seeing a presence or small animals, which could include deceased pets. - These can be deeply distressing for individuals, affecting daily life more significantly than tremors.
Cognitive Impairment:
- Around 30-50% of Parkinson's patients may develop dementia later in the disease's progression, termed Parkinson's disease dementia (PDD).

Definition:
- During REM sleep, typical motor muscles are immobilized. However, in RBD, individuals may physically act out dreams, sometimes leading to injuries.
Behavioral Insights:
- Individuals may exhibit actions like smoking while asleep. Research has shown correlations between eye movements during dreaming and actions performed while asleep.
Saccades and Smooth Pursuit:
- These eye movements occur regularly; saccades are rapid adjustments of gaze, while smooth pursuit tracks moving objects.
- In RBD, the linking of eye movements to behavior provides support for the Scanning Hypothesis - the idea that eye movements reflect an individual's focus within their dream.

Substantia Nigra Degeneration:
- Key area affected, where dopaminergic neurons degenerate, causing motor symptoms. - Notable that symptoms appear only after 50-70% of these neurons are lost, highlighting the need for early detection.
Biomarker Research:
- Current efforts focus on identifying early biomarkers of Parkinson's to allow for interventions before significant damage occurs.
Pathological Markers:
- Lewy bodies: Clumps of protein found in affected neurons, detected in patients with Parkinson's, indicating cell death and disease progression.

Gender Differences:
- Parkinson's is about 2.5 times more common in males compared to females, though reasons for this are unclear.
Environmental Factors:
- Notable chemicals associated with increased Parkinson's risk include paraquat, mancozeb, and rotenone, used in agricultural settings.
- Evidence of increased risk exists in certain farming communities that have been exposed to these chemicals.

L-DOPA Therapy:
- Standard treatment involves administering L-DOPA, the chemical precursor to dopamine, as it can cross the blood-brain barrier; this alleviates some motor symptoms. - Challenges include the wearing-off phenomenon, where L-DOPA's effectiveness declines over time, leading to unpredictable motor function.
Deep Brain Stimulation (DBS):
- For patients where L-DOPA is insufficient, DBS involves implanting electrodes targeting the subthalamic nucleus, which helps manage motor symptoms.
Notable Cases:
- The film Awakenings (1980s) depicted the use of L-DOPA in patients with severe rigidity, demonstrating its transformative effects alongside the risks of psychosis associated with overstimulation of dopamine receptors.
Long-Term Effects:
- Patients may develop dyskinesias, uncontrolled movements resulting from long-term L-DOPA use, complicating treatment regimens.

Public Perception:
- Discourse surrounding symptoms and treatment has been shaped by public figures such as Michael J. Fox, whose own experiences with the condition have influenced awareness and advocacy efforts.
Political Discourse:
- Michael J. Fox faced public scrutiny and unfounded accusations regarding the portrayal of his symptoms, reflecting broader societal stigmas associated with illness.

Current Research Directions:
- Ongoing research aims to deepen the understanding of early symptoms, biomarkers, and non-motor aspects of Parkinson's disease, evolving treatment options and preventative strategies.
- Continuous efforts to improve the quality of life for those with Parkinson's hinge on comprehensive research and understanding of both motor and non-motor symptoms.