103 results
Parathyroid Hormone (PTH) Effect in Calcium and Phosphorus
Calcium - Net Effect Hypercalcemia:
   ↑ intestinal
↑ intestinal absorption ... ↑ bone reabsorption ... ↑ tubular reabsorption ... ↓↓ tubular reabsorption ... pathophysiology #endocrinology
Hypercalcemia - Hormones and Pathophysiology  
Calcitriol:
 • Bones: Enhances mineralization
 • GI Tract: ↑ Ca2+
Tract: ↑ Ca2+ absorption ... , ↑ PO4- absorption ... , ↑ PO4- reabsorption ... Tract: ↓ Ca2+ absorption ... Pathophysiology #endocrinology
AATS lung cancer screening guidelines for solid nodules on low-dose computed tomography (LDCT). PET/CT, Positron emission
computed tomography (LDCT ... PulmonaryNodules #Algorithm ... #LowDoseCT #LDCT
Hypercalcemia of Malignancy - Pathophysiology
PTH-mediated
 • Parathyroid cancer
 • Ectopic production: Small cell lung cancer, ovarian
intestinal calcium absorption ... and stimulates resorption ... Stimulate calcium reabsorption ... kidney, Stimulates resorption ... Differential #Diagnosis #algorithm
Hypercalcemia - Differential Diagnosis Algorithm
Elevated PTH (High or normal):
 • Primary Hyperparathyroidism
 • Familial Hypocalciuric Hypercalcemia
Low
Differential Diagnosis Algorithm ... Miscellaneous - Bone Resorption ... - Calcium Reabsorption ... Differential #Diagnosis #Algorithm ... #causes #endocrinology
Causes of Hypercalcemia
Hypercalcemia due to increased bone Ca2+ resorption:
 • Primary hyperparathyroidism, Malignancy, Pseudohyperparathyroidism, Renal failure,
increased bone Ca2+ resorption ... increased GI Ca2+ absorption ... calcium #high #endocrinology
Hyperphosphatemia - Differential Diagnosis Algorithm
Transcellular Shift:
 • Rhabdomyolysis
 • Tumor Lysis
 • Metabolic or Respiratory Acidosis
Differential Diagnosis Algorithm ... Increased Intake / Absorption ... Differential #Diagnosis #Algorithm ... #endocrinology
Major Segments of the Nephron and their Functions 
 - Glomerulus - Formation of glomerular filtrate
tubule (PCT) - Reabsorption ... Isosmotic reabsorption ... Secretion and reabsorption ... convoluted tubule (DCT ... ) - Active reabsorption
Magnesium Absorption and Pathophysiology 
Magnesium Absorption: 
 • absorbed in the GIT — small intestine, Saturable
Magnesium Absorption ... Pathophysiology Magnesium Absorption ... Henle • 5-10% in DCT ... #Magnesium #Absorption
Vitamin D Metabolism
Fat-soluble vitamin
Sources: dermal synthesis and food (dairy products, fish)
Active form: calcitriol (1,25-OH Vitamin D)
Main
role: intestinal absorption ... VitaminD #Metabolism #endocrinology