Untitled Notes

Definition: Antibodies against presynaptic calcium channels.
Hypersensitivity Type: Type II hypersensitivity.
Clinical Symptoms: Muscle weakness that improves throughout the day. If weakness worsens throughout the day, consider myasthenia gravis.

Presynaptic Calcium Channels: In Lambert Eaton, presynaptic calcium channels are inhibited, preventing the release of acetylcholine.
Neurotransmitter Release: Calcium influx is essential for neurotransmitter release, analogous to paying a toll before crossing a bridge to release a car (or neurotransmitter).
Implications for Myasthenia Gravis: In myasthenia gravis, antibodies target postsynaptic acetylcholine receptors.

Clinical Presentation: Central tumor associated with hyponatremia and possibly hypokalemia; often linked with small cell lung cancer (SCLC).

Fatty Casts: Indicate nephrotic syndrome with conditions such as hypoalbuminemia and hyperlipidemia.
- Protein Loss: Greater than 3.5 grams of protein per day due to nephron damage leading to hypoalbuminemia.
Transudative Pleural Effusions: Caused by conditions like cirrhosis and congestive heart failure (CHF).
RBC Casts: Seen in conditions with oliguria, azotemia, and hypertension; indicative of glomerular injury.
Muddy Brown Casts: Associated with acute tubular necrosis.
Urine Eosinophils: Indicative of acute interstitial nephritis (AIN).

Clinical Presentation: Symptoms include exophthalmos, diffuse goiter, tachycardia, weight loss, and atrial fibrillation.
TSH Levels: TSH levels will be low due to feedback inhibition from high T3 and T4 levels.
Common Cause: Graves' disease identified by antibodies targeted against TSH receptors or thyroglobulin.
Treatment for Exophthalmos: Steroids to reduce lymphocytic infiltrate in retro-orbital space.

Clinical Presentation: Autoimmune disorder causing destruction of thyroid tissue, leading to hypothyroidism.
Common Symptoms: Fatigue, weight gain, depression, cold intolerance, and myxedema.
Antibodies Present: Anti-thyroglobulin antibodies and TPO antibodies.
Treatment: Lifelong levothyroxine administration.

Arteriosclerosis Type: Both afferent and efferent arterioles affected, leading to hyaline arteriolosclerosis.

Causes: Associated with infections, medications, autoimmune diseases, and solid tumors; presents with granular immunofluorescence due to antibodies against phospholipase A1 or A2 receptors.

Wiskott-Aldrich Syndrome: Characterized by decreased IgA, increased IgE, and decreased IgM; actin cytoskeletal defect.
Ataxia Telangiectasia: Associated with decreased IgA and nonhomologous end joining DNA repair defect.

Chronic Granulomatous Disease (CGD): Caused by defects in NADPH oxidase leading to susceptibility to catalase-positive organisms.
- NBT Test: Negative result indicates CGD; positive indicates myeloperoxidase (MPO) deficiency.

Multiple Myeloma Symptoms (CRAB): Hypercalcemia, renal failure, anemia, and bone lesions leading to lytic bone lesions and increased risk of infections. The primary defect is in B-cell production, leading to deficient antibody response.
Hodgkin's Lymphoma: Characterized by Reed-Sternberg cells; positive for markers CD15 and CD30.

Cytomegalovirus (CMV): Treatment with ganciclovir for congenital infections leading to periventricular calcifications.
Streptococcus pneumoniae: Treatment with penicillin or ceftriaxone; virulence factors include IgA protease, capsule for evasion of host immune response.

Axillary Nerve Injury: Caused by surgical neck of the humerus; leads to weakened abduction and loss of sensation over the deltoid region.
Musculocutaneous Nerve Injury: Affects the anterior compartment of the arm, leading to loss of biceps muscle function.

Wrist Drop: Sign of radial nerve injury.
Ape Hand Deformity: Indicates median nerve injury, often due to fractures around the elbow.

Study Session: Note scheduled study times with emphasis on review of high-yield concepts relevant to exams, discussion of multiple pathology in renal and endocrine systems, and infectious disease management strategies.