Nephrology Course - Anatomy, Physiology, Diseases & Drugs

Explore nephron histology from glomerulus to collecting ducts, detailing macula densa and juxtaglomerular cells, tubule reabsorption, and hormones like parathyroid hormone, angiotensin II, aldosterone, and ADH.

Angiotensin II, formed from angiotensinogen via renin and ACE, raises blood pressure through vasoconstriction and GFR changes. It triggers aldosterone, ADH, and direct renal sodium reabsorption, promoting hypervolemia and hypertension.

Identify how arterial carbon dioxide pressure and bicarbonate drive respiratory and metabolic acid-base changes. Define respiratory and metabolic acid-base disorders and recall mnemonics for causes and anion gap assessment.

Explore how acute high altitude triggers hyperventilation and respiratory alkalosis, causing altitude sickness, bicarbonate excretion and urine alkalosis, with acetazolamide and adaptive changes like increased BPG, erythropoietin, polycythemia, and mitochondria.

Carbon dioxide travels in blood as bicarbonate and bound to hemoglobin, with carbonic anhydrase converting carbon dioxide to bicarbonate and chloride exchange enabling Bohr and Haldane effects for exhalation.

Demonstrates how bicarbonate in the lumen of proximal tubule cells converts with hydrogen via carbonic anhydrase to carbon dioxide and water, then reforms bicarbonate for blood absorption.

Learn about stress, urgency, and overflow incontinence, their bladder and urethral mechanics, common causes, and treatment options from Kegel exercises to antimuscarinics, catheterization when needed.

Aldosterone from the zona glomerulosa of the adrenal cortex promotes sodium reabsorption and potassium excretion to regulate water balance, highlighting Conn's syndrome and Addison's disease.

ADH is produced in the hypothalamus and stored in the posterior pituitary, regulated by osmoreceptors; desmopressin treats diabetes insipidus and nocturnal enuresis, while demeclocycline antagonizes ADH receptors in SIADH.

Diabetes insipidus results from ineffective antidiuretic hormone, causing an inability to concentrate urine; central diabetic insipidus arises from reduced ADH secretion, while nephrogenic diabetes insipidus stems from defective kidney receptors.

Explain how 21 hydroxylase deficiency disrupts aldosterone and cortisol, triggering a feedback cycle with elevated 17 hydroxyprogesterone, ambiguous genitalia, salt wasting, and other enzyme deficiencies.

Explore the congenital adrenal hyperplasia pathway, showing cholesterol to pregnenolone and branching to aldosterone, cortisol, or sex hormones via enzymes such as desmolase and 21 hydroxylase.

Antibiotics trigger hemolytic uremic syndrome from E. coli O157:H7, causing hemolysis, anemia, thrombocytopenia, and acute renal failure, with no neurological symptoms. Treat with plasmapheresis; avoid antibiotics and platelets.

Autoantibodies attack platelets, destroying them and enlarging megakaryocytes while producing defective platelets. Absence of splenomegaly helps diagnose immune thrombocytopenia; triggers include infections, cancers, and drugs; treatment uses steroids or splenectomy.

Adamts13 deficiency triggers widespread platelet activation and red blood cell destruction after stress, causing thrombotic thrombocytopenic purpura with neurological symptoms; plasmapheresis is the main treatment, avoid platelets or antibiotics.

Compare HUS and TTP: both show low platelets and red blood cells with uremia. TTP features neurological symptoms; HUS shows acute renal failure. Treat with plasmapheresis; avoid platelets and antibiotics.

Understand nephrotic syndrome from podocyte damage causing heavy proteinuria, hypoalbuminemia, and frothy urine, with risks of hypercoagulability and infection. Explore subtypes like minimal change disease, FSGS, and membranous nephropathy.

Polycythemia vera causes overproduction of red blood cells from a mutation, increasing blood viscosity and aquagenic pruritus, with hypertension and possible progression requiring hydroxyurea or phlebotomy.

Investigate post-streptococcal glomerulonephritis, a type iii hypersensitivity where streptococcal pharyngitis triggers immune complex mediated kidney injury, causing hematuria, hypertension, low complement, and subepithelial humps.

Explore preload, cardiac output, and afterload across shock syndromes, including cardiac shocks from myocardial damage, hypovoleamic shock, and high-output heart failure due to fistulas.

Explore SIADH, where elevated ADH causes water retention and euvolemic hyponatremia, ectopic cancer sources; diagnose with a water deprivation test and treat with salt restriction, hypertonic saline, or ADH antagonists.

Compare hyperacute, acute, and chronic transplant rejections, their timing and hypersensitivity mechanisms, with tissue changes such as mesangial hyperplasia, vanishing bile ducts, coronary atherosclerosis, and bronchiolar thickening.

Explore how calcium oxalate stones form from excess calcium or oxalate, and note oxalate-rich foods like chocolate and vegetables, plus other stone types and dehydration risk.

ACE inhibitors block ACE, lowering angiotensin II and increasing bradykinin to reduce blood pressure and protect kidneys in diabetes and diabetic nephropathy; watch for dry cough and angioedema.

Block renal carbonic anhydrase to deplete bicarbonate and cause acidosis, alkalizing urine, aiding aspirin overdose and altitude sickness; use for pseudotumor cerebri and glaucoma, with optic nerve fenestration if needed.

Angiotensin II receptor blockers, or sartans, block angiotensin II receptors to lower blood pressure without bradykinin cough; they protect against diabetic nephropathy and may cause transient creatinine rise and hyperkalemia.

Identify fludrocortisone as a synthetic aldosterone analogue with glucocorticoid effects, used for primary adrenal insufficiency, and note hypervolemia, edema, hyperpigmentation, and infection via nuclear transcription of anti-inflammatory peptides.

Loop diuretics inhibit the Na-K-2Cl cotransporter in the loop of Henle, causing diuresis and reduced medullary tonicity, with prostaglandin release and ototoxicity risks; they treat edema, hypertension, and hypercalcemia.

Potassium-sparing diuretics such as spironolactone, eplerenone, triamterene, and amiloride block collecting-duct sodium channels to promote diuresis, treat hyperaldosteronism, ascites, and heart failure, and cause hyperkalemia and gynecomastia.

Explore adrenergic receptors—alpha1 and alpha2, beta1–beta3—and how norepinephrine and epinephrine trigger them. Learn how agonists and antagonists treat hypertension, benign prostatic hyperplasia, impotence, asthma, and bladder relaxation.

Aminoglycosides are oxygen-dependent antibiotics that irreversibly inhibit the 30S ribosome, misreading mRNA. They kill gram-negative rods; not effective against anaerobes; nephrotoxicity, ototoxicity, teratogenicity; resistance via phosphorylation, adenylation, acetylation.

Outline how amphotericin B and nystatin disrupt fungal cell walls to treat systemic Candida infections and local infections like tinea, noting nephrotoxicity and electrolyte disturbances.

Aspirin irreversibly inhibits cyclooxygenase-1 at low doses to reduce thromboxane A2 and coagulation, while high doses yield anti-inflammatory effects and risks like gastric ulcers, kidney ischemia, and Reye syndrome.

Beta blockers such as propranolol, atenolol, labetalol, and esmolol antagonize beta-1 receptors more than beta-2 receptors to slow the heart, treating angina and supraventricular tachycardia.

Carbapenems treat serious infections; ertapenem is effective against Pseudomonas. They share mechanism with daptomycin for gram positives and with amphotericin B and nystatin for fungi, and cilastatin inhibits renal clearance.

Cephalosporins span five generations with varying gram-positive and gram-negative coverage; first generation targets staph and surgical prophylaxis, while later generations expand blood brain barrier penetration and Pseudomonas activity.

Inhibits ribosomal protein synthesis as a bacteriostatic antibiotic, clindamycin targets anaerobic infections above the diaphragm, while metronidazole covers below the diaphragm; it may cause pseudomembranous colitis.

Utilize daptomycin to disrupt bacterial wall, with polymyxin if needed, for MRSA and VRE; monitor CPK for muscle damage, with statins, and avoid lung infections due to surfactant binding.

Doxycycline, a tetracycline, inhibits RNA binding to the bacterial ribosome and remains bacteriostatic, useful for MRSA and PID, while avoiding calcium, iron, and antacids.

Explore how fluoroquinolones inhibit DNA topoisomerase four and two (gyrase) to disrupt replication. Note activity against gram-positive and gram-negative infections, including pseudomonas, with moxifloxacin for COPD pneumonia.

Learn how macrolides like Azithromycin and Clarithromycin treat Campylobacter, Legionella, atypical pneumonia, and pertussis, with Azithromycin favored for sexually transmitted diseases, and understand their side effects and resistance.

Generates free radicals to kill bacteria and protozoa, targets anaerobes below the diaphragm, and treats amoeba, C. difficile colitis, Fusobacterium, Giardia, and H. pylori, with a disulfiram-like reaction.

Penicillin binds penicillin binding protein to inhibit peptidoglycan crosslinking, causing cell-wall defects; indications include pneumococci, enterococci, Neisseria, syphilis, Staphylococcus and streptococci, Actinomyces, Anthrax and Clostridium.

Explore penicillinases and amino penicillins like amoxicillin and ampicillin, their beta-lactamase inhibitors, and wide-spectrum use for gram-positive and gram-negative infections; penicillinase-resistant options—dicloxacillin, nafcillin, oxacillin—for staph infections, excluding MRSA.

Sulfamethoxazole inhibits dihydropteroate synthase to block folate synthesis and DNA production. Pair with trimethoprim for sequential blockade, and apply to gram-positive and gram-negative infections, including Nocardia.

Vancomycin blocks peptidoglycan synthesis by binding the d-alanine d-alanine glycoprotein, treating serious gram-positive infections like MRSA, VRE, and C. difficile. Red man syndrome and ototoxicity may occur; resistance can develop.

Acetaminophen inhibits CNS cyclooxygenase, yielding antipyretic effects for fever in children and mild analgesia, with no peripheral anti-inflammatory action. Overdose forms napqi detoxified by glutathione; NEC or cysteine regenerates glutathione.

Block COX-1 and COX-2 to inhibit prostaglandin synthesis; NSAIDs relieve pain and fever but risk ulcers and injury, and are contraindicated in cyanotic heart disease requiring PDA; indomethacin closes PDA.

Understand aspirin as an irreversible COX inhibitor with low-dose COX-1 platelet inhibition and high-dose COX-2 anti-inflammatory effects. Watch for gastric ulcers, Reye's risk in viral infection, tinnitus, and kidney injury.

Explains delta, kappa, and mu opioid receptors and how activation inhibits pain signaling; reviews key opioids, withdrawal with antagonists, tolerance, and effects like addiction.

Identify Staphylococcus aureus as a gram-positive, beta-hemolytic, catalase- and coagulase-positive bacterium. Causes skin infections, pneumonia, endocarditis, toxic shock syndrome, MRSA, and food poisoning, via hemolysin and protein A.

Streptococcus forms long chains and releases toxins, alters immunity via M protein, and produces pus, driving diseases from scarlet fever to necrotizing fasciitis, toxic shock-like syndrome, and rheumatic fever.

Memorize pseudomonas aeruginosa features with a mnemonic, covering pneumonia in cystic fibrosis, sepsis, otitis externa, nosocomial infections, toxins, and treat with antipseudomonal beta-lactams, aminoglycosides, and carbapenems.

Explore Listeria biology, including growth in raw meat and unpasteurized dairy, placental transmission, and intracellular spread via listeriolysin O and actin tails. Immunocompromised patients face illness; ampicillin treats.

Explore Legionella detection via silver stain and charcoal agar culture, urine antigen testing, water or air transmission (no person-to-person spread), and hyponatremia as a hallmark; treat with macrolides or fluoroquinolones.

Endotoxins are part of the gram negative outer membrane containing lipid A and lipopolysaccharide, provoke fever via TNF-alpha, hypotension via nitric oxide, DIC, and neutrophil recruitment, with no vaccine.

Explore the four major E. coli types: hemorrhagic E. coli O157 causing hemolytic uremic syndrome and dysentery; enteropathogenic, enterotoxigenic, and enteroinvasive forms with distinct mucosal effects and diarrhea.

Trace renal embryology through pronephros, mesonephros, and metanephros, noting ureteric bud and blastema induction of the kidney, with roles in male reproductive organs and garter duct.

Autonomy gives patients the right to accept or refuse treatment after full disclosure of options, risks, benefits, and alternatives, and acknowledges physician autonomy to decline elective procedures when appropriate.

Physicians act in the patient's best interest by staying updated, following guidelines, and recognizing when deviations suit individual cases, balancing beneficence with autonomy.

Balance impartial fairness with equitable triage and prioritize life-threatening cases over routine procedures when resources are scarce.

Practice nonmaleficence by prioritizing more good than harm, minimize harm in unavoidable cases like infection with amputation, and balance autonomy with public health by weighing risks and benefits.

Explore cancer chemotherapy terminology, including adjuvant, neoadjuvant, salvage, induction, consolidation, and maintenance therapies, and how each approach targets cancer cells at different treatment stages.

Pheochromocytoma arises from adrenal medulla chromaffin cells of neural crest origin, secreting epinephrine and dopamine to cause episodic hypertension; diagnose with urinary metanephrines and chromogranin.

Explains how chemotherapy-induced tumor lysis releases potassium, phosphate, calcium, and uric acid into the blood, risking acute renal failure. Describes prevention and treatment with aggressive hydration, rasburicase, and allopurinol.

Learn how tumor grading reflects cellular differentiation and mitotic activity to inform prognosis, then explore TNM staging: tumor size, nodal involvement, and metastasis, plus the C, P, and B modifiers.