Multiple Sclerosis

Definition: Multiple Sclerosis (MS) is a chronic, progressive disease of the central nervous system (CNS), which includes the brain and spinal cord.
Systems Involved: Primarily affects the neurological and immune systems.
Incidence: Most commonly strikes individuals aged 20-40 years.
Curability: Currently, MS is not curable, but medications can help manage the disease.

Multiple: Refers to the many scattered areas of damage in the brain and spinal cord.
Sclerosis: Refers to the hardened tissue in the affected areas due to damage.
Mechanism: The immune system attacks the myelin sheath (protective covering of nerve fibers), leading to communication problems between the brain and body.
Medication Impact: Medications can help by speeding recovery from attacks and modifying the course of the disease along with its symptoms.

Lesions: Damaged myelin leads to lesions that can cause symptoms such as numbness, pain, or tingling below the lesion.
Example of Symptoms: Symptoms experienced can include issues such as numbness, lack of coordination, and changes in sensory perception, influenced by lesion locations (e.g., optic nerve, brain stem, motor nerve tract).
Physical Activity: Some individuals with MS can still engage in athletic activities; however, factors such as body temperature can drastically affect sensory perception and physical performance.

Prevalence in Canada: Approximately 90,000 Canadians have MS, which corresponds to about 250 people per 100,000.
Cost of Treatment: The annual cost of medications is around $12,000 per patient, contributing to a total of 1.5 to 2 billion dollars in medical expenses annually.
Survival Rates: In 1936, only 8% survived beyond 20 years; now, patients can expect to live within a few years of average life expectancy minus 7 years.

Understanding MS: While the exact causes remain largely unknown, MS is classified as an autoimmune disease, where the body's immune system mistakenly attacks its own tissues.
T-cells and Monocytes: These cells are involved in the destruction of the myelin sheath.

Demographics:
- Age: Most often occurs in individuals aged 20-40.
- Sex: Women are approximately twice as likely to develop MS compared to men.
- Family History: A family history of MS increases susceptibility.
Environmental Factors:
- Certain viruses, particularly Epstein-Barr, have been linked.
- Geographic location, particularly temperate climates, shows higher incidences (e.g., Canada, northern US).
Autoimmune Diseases: Presence of other autoimmune conditions (like thyroid disease or type 1 diabetes) may raise risk.
Lifestyle Factors: Smoking is a contributing factor, and race also influences risk, being highest in individuals of Northern European descent.

Significant Symptoms: 78% of patients experience fatigue. Other symptoms include:
- Visual disturbances (due to optic nerve lesions)
- Balance and coordination issues (from cerebellum lesions)
- Muscle weakness and paralysis (from motor nerve tract lesions)
- Altered sensations and pain (from sensory nerve tract lesions)
Symptoms vary widely depending on individual experiences and lesion locations.

Exacerbations and Remissions: MS is characterized by episodes of exacerbation (flare-ups) where symptoms worsen, contrasted by periods of remission where symptoms stabilize.
Types of MS:
1. Relapsing-Remitting MS (RRMS): Most common type; characterized by clear relapses followed by periods of remission.
2. Secondary Progressive MS (SPMS): Follows RRMS where distinct relapses become less notable and disability gradually advances.
3. Primary Progressive MS (PPMS): Steady progression of disability without discrete relapses.
4. Progressive-Relapsing MS (PRMS): Characterized by progressive disease from the onset with relapses but no periods of stability.

Physical Activity Guidelines: For adults with mild to moderate MS:
- Engage in at least 30 minutes of moderate-intensity aerobic activity twice a week.
- Incorporate strength training exercises for major muscle groups, also twice a week.
Benefits of Exercise: Exercise is shown to improve aerobic capacity, muscle strength, and overall quality of life.
Risks and Considerations: MS may affect fitness levels, lead to fatigue, and individuals may have heat intolerance; however, exercise is manageable and does not trigger exacerbations when properly guided.
Psychological Considerations: Individuals might also experience symptoms of depression, which can be mitigated through proper exercise regimes.
Recommendations: Activities should increase gradually in intensity and frequency and monitoring of perceived exertion is important.