## Normal Lipid Levels and Functions
- Lipids serve as energy stores and structural components of cells
- Normal fasting plasma levels:
- Triglycerides (TG): 50-150 mg/dl
- Phospholipids: 150-250 mg/dl
- Cholesterol: 140-250 mg/dl (varies by population, age, gender)
- Esterified cholesterol: 65-75% of total

## Fatty Acids
- Mostly straight chains with even number of carbon atoms
- Major categories:
1. Monounsaturated (Palmitoleic, Oleic)
2. Polyunsaturated (Linoleic, Linolenic, Arachidonic, Eicosapentaenoic)
3. Saturated (Myristic, Palmitic, Stearic)

## Lipoproteins
### Classification by Density
1. Chylomicrons
- Transport exogenous lipids from intestine
- Not present in fasting plasma
2. VLDL (Very Low Density Lipoproteins)
- Transport endogenous lipids from liver
3. LDL (Low Density Lipoproteins)
- Transport cholesterol to cells
4. HDL (High Density Lipoproteins)
- Returns cholesterol from peripheral tissues to liver

### Electrophoretic Classification
- α-Lipoproteins (corresponds to HDL)
- β-Lipoproteins (corresponds to LDL)
- pre-β Lipoproteins (corresponds to VLDL)

## Hyperlipoproteinemias
### Primary (Genetic) Causes
- Familial Hypercholesterolemia (FH)
- Defined criteria:
- Adults: cholesterol >7.5 mmol/L
- Children under 16: >6.7 mmol/L
- LDL cholesterol >4.9 mmol/L in adults

### Secondary Causes
1. Hypercholesterolemia
- Hypothyroidism
- Nephrotic syndrome
- Cholestatic jaundice
2. Hypertriglyceridemia
- Diabetes mellitus
- Alcoholism
- Chronic renal disease
- Estrogen therapy

## Relationship with Atherosclerosis
- Increased total cholesterol and LDL correlate positively with IHD
- Increased HDL correlates negatively with IHD
- Increased triglycerides show weaker positive correlation with IHD

## Treatment
### Lipid-lowering Drugs
1. Statins
- Significant cholesterol and LDL reduction
2. Fibrates
- Primarily reduce triglycerides
3. Bile salt sequestrants
4. Ezetimibe
5. Nicotinic acid
6. Omega 3

## Investigation Guidelines
- 12-hour fasting before blood collection
- Avoid testing during acute illness
- Wait 3 months after acute events
- Standard profile includes cholesterol, triglyceride, and HDL measurements

## Clinical Cases
1. 23-year-old woman
- Cholesterol 11.4 mmol/L
- Family history of premature cardiovascular disease
- Diagnosis: Familial hypercholesterolemia

2. 43-year-old man
- Mixed hyperlipidemia
- ApoE2/E2 genotype
- Diagnosis: Type III hyperlipoproteinemia

3. 15-year-old woman
- Severe hypertriglyceridemia
- Acute pancreatitis
- Diagnosis: Lipoprotein lipase deficiency

مُلخص المحاضرة الثالثة 👇🏻

## Liver Function Parameters

### Biochemical Markers
#### Proteins
- Albumin: 20-day half-life
- A/G ratio important for assessment
- Reduced globulin may indicate acute liver disease
- Critical albumin level for ascites: <3 g/dl

#### Enzymes
- Aminotransferases (AST/ALT): Hepatocellular damage markers
- Alkaline Phosphatase (ALP): Less specific for hepatobiliary disease
- γ-GT: Specific for alcoholism and hepatobiliary conditions
- 5'-Nucleotidase: Hepato-biliary specific

#### Bilirubin
- Normal level: 20mg/dL
- Analysis by HPLC (Lauff method) separates:
* Unconjugated (α)
* Monoglucouronide (β)
* Diglucouronide (γ)
* Recovery fraction (δ)

### Clinical Conditions

#### Types of Jaundice
1. Pre-hepatic: Rh incompatibility, sports injuries
2. Hepatocellular
3. Post-hepatic: Intrahepatic (medical) or post-hepatic (surgical)

#### Congenital Syndromes
- Gilbert's: Reduced hepatic uptake
- Crigler-Najjar: Enzyme deficiency/absence
- Dubin-Johnson/Rotor: Conjugated bilirubin transfer defect

#### Ascites Types
- Transudate: Portal fluid
- Exudate (>30g/L): Due to TB Peritonitis, malignancy, pancreatic disease

### Metabolic Changes in Liver Disease
1. Carbohydrate: Disturbed glycogen-glucose conversion
2. Lipid:
- Variable cholesterol levels by condition
- Lipoprotein X in cholestasis
3. Protein: Affects albumin, fibrinogen, coagulation factors

### Bile Acid Metabolism
- Primary acids from cholesterol
- Conjugation with glycine/taurine
- Secondary formation through bacterial processes
- Pool location varies with digestion state

### Diagnostic Markers
- α-fetoprotein: Hepatocellular carcinoma
- Ammonia: Hepatic coma
- Immunoglobulins patterns:
* IgA: Cirrhosis
* IgM: Primary biliary cirrhosis
* IgG: Chronic active hepatitis

### Cirrhosis Classification
#### Mild
- Abnormal bile acids
- Elevated enzymes
- Bilirubin ~1.5 g/dl

#### Severe
- High bilirubin
- Low albumin
- Increased immunoglobulins
- Prolonged prothrombin time
- High ammonia
- Low urea

مُلخص المحاضرة الرابعة 👇🏻

# Renal Function
## Formation of Urine
- Involves ultrafiltration at glomerulus, tubular reabsorption, and tubular secretion
- Key components conversion from GF to urine:
- Water: 180,000 ml → 1500 ml
- Sodium: 20,000 mmol/l → 150
- Albumin: 4 gm → 0.04-0.1
- Urea: 54 gm → 24

## Glomerular Filtration Rate (GFR)
### Measurement Methods
- Inulin clearance
- Creatinine clearance
- Urea clearance
- 51Cr-EDTA

### Ideal GFR Measurement Substance Characteristics
- Readily filtered at glomerulus
- Neither reabsorbed nor secreted by tubules
- Maintains constant plasma concentration
- Accurately measurable in plasma and urine
- Non-toxic and biologically inert if exogenous

## Plasma Measurements
### Plasma Urea
#### Decreased Levels Causes
- Low protein diet
- Decreased protein catabolism from anabolic steroids
- Chronic liver diseases

#### Increased Levels Causes
- Physiological: High protein diet
- Pre-renal: Decreased perfusion (hypovolemia, low BP, dehydration)
- Renal: Acute & chronic renal failure
- Post-renal: Outflow obstruction

### Plasma Creatinine
- Reliable indicator of uremia
- Derived from muscle protein catabolism
- Not influenced by diet
- Analyzed using alkaline picrate (Jaffi method)

## Tubular Functions
- Urine concentration ability (tested by water deprivation test)
- Normal urine osmolality: >800 mosmol/kg
- Normal plasma osmolality: 285-295 mosmol/kg
- Salt load excretion
- Acid load excretion (normal urinary pH <5.3)

## Renal Failure
### Acute Renal Failure
- Phases: Oliguric → Diuretic → Recovery
- Urinary volume changes
- Affects K+, Na+, urea, and creatinine levels

### Chronic Renal Failure
- Increased urea and creatinine
- Variable Na+ and K+ levels
- Metabolic acidosis
- Elevated phosphate
- Variable calcium levels

## Clearance and Threshold
- Creatinine clearance:
- Adults: 125 ml/min
- Age 70: 90 ml/min
- Age 90: 70 ml/min
- Glucose threshold: 180 mg/dl
- Urea threshold: zero

## Proteinuria Types
- Orthostatic: Present only when standing
- Overflow
- Glomerular: Selective vs non-selective based on protein clearance ratios
- Tubular: Associated with various conditions including Fanconi syndrome and heavy metal poisoning

## Renal Stones
- More common in hot climates
- Types and Frequency:
- Calcium oxalate & mixed: 80-85%
- Magnesium ammonium phosphate: 5-10%
- Uric acid: 5-10%
- Cystine: 1%
- Xanthine: rare

## Genetic Disorders
### Fanconi's Syndrome
- Multiple proximal tubule defects
- Affects amino acids, phosphate, glucose, and bicarbonate handling

### Other Disorders
- Cystinosis: Affects lymphoreticular system and renal tubules
- Cystinuria: Excessive cystine excretion
- Hartnup disease: Affects monoamino monocarboxylic amino acids

الملزمة الاولى

Renal failure

اسئلة البايو النظري م4 بعد التصحيح

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