Myasthenia Gravis Physical Examination

Play an AI-generated podcast conversation about this lesson

What is the duration of the ice pack test?

10-15 minutes
3-5 minutes (correct)
10-15 seconds
1-2 hours

What is the primary purpose of a physical examination in diagnosing MG?

To detect weakness, particularly muscle weakness (correct)
To confirm the presence of MG
To rule out other neurological disorders
To determine the type of MG

What is the effect of cold on neuromuscular transmission in MG patients?

It has no effect on acetylcholinesterase
It increases the activity of acetylcholinesterase
It reduces the activity of acetylcholinesterase (correct)
It completely breaks down acetylcholine

What is the minimum improvement in eyelid drooping required for a positive ice pack test result?

At least 2 millimeters (C) Signup and view all the answers

Who is the ice pack test used for?

Patients with drooping eyelids or ptosis (B) Signup and view all the answers

How long does the improvement in eyelid drooping last after a positive ice pack test result?

A few minutes (A) Signup and view all the answers

What is the purpose of the anti-acetylcholine receptor antibody test in diagnosing autoimmune myasthenia gravis?

To identify the presence of antibodies that target acetylcholine receptors (B) Signup and view all the answers

What is the result of the immune system's attack on acetylcholine receptors in myasthenia gravis?

Disruption of normal muscle contraction (B) Signup and view all the answers

What is the mechanism of the repetitive nerve stimulation test in EMG?

Stimulating a nerve repeatedly to measure muscle response (C) Signup and view all the answers

What is the action of antibodies that target acetylcholine receptors in myasthenia gravis?

Blocking the binding of acetylcholine to receptors (D) Signup and view all the answers

What is the primary goal of the anti-acetylcholine receptor antibody test in diagnosing autoimmune myasthenia gravis?

To confirm the diagnosis of autoimmune myasthenia gravis (C) Signup and view all the answers

What is the effect of the immune system's attack on acetylcholine receptors in myasthenia gravis?

Reduced availability of acetylcholine receptors (D) Signup and view all the answers

What is the term for the decrease in muscle response amplitude with repeated stimulation in Myasthenia Gravis?

Decrement (A) Signup and view all the answers

What is the primary purpose of RNS in diagnosing Myasthenia Gravis?

To highlight the weakness in neuromuscular transmission (B) Signup and view all the answers

What is the term for the variation in response times between different muscle fibers in Myasthenia Gravis?

Jitter (C) Signup and view all the answers

What does SFEMG provide in diagnosing Myasthenia Gravis?

A detailed picture of neuromuscular transmission at the level of individual muscle fibers (B) Signup and view all the answers

What is the effect of AChR antibodies on neuromuscular transmission in Myasthenia Gravis?

Blocked or destroyed AChRs (D) Signup and view all the answers

What is the significance of the patchy distribution of AChR antibodies in Myasthenia Gravis?

It results in jitter, a time delay in muscle fiber response (C) Signup and view all the answers