Which factor increases gastric acid secretion? Ответы(один ответ) 1 C) Water intake 2 D) Exercise 3 A) Smoking and stress 4 B) Sleep
Answer: 3) A) Smoking and stress
Both smoking and psychological stress are well-established stimulants of gastric acid secretion:
- Smoking stimulates parietal cells (partly via nicotine), reduces prostaglandin-mediated mucosal protection, and impairs bicarbonate secretion.
- Stress activates the hypothalamic-pituitary-adrenal axis and the vagus nerve, leading to increased acetylcholine release, which directly stimulates parietal cells to secrete HCl.
Why the others are wrong:
| Option | Effect on Gastric Acid |
|---|---|
| Water intake | Dilutes gastric contents; minimal stimulatory effect |
| Exercise | Moderate-to-vigorous exercise actually suppresses gastric acid secretion by reducing splanchnic blood flow |
| Sleep | Gastric acid secretion follows a circadian rhythm and peaks in the early night, but sleep itself is not a direct stimulant; acid output is generally lower during deep sleep |
The three main physiological stimulants of gastric acid are histamine (from enterochromaffin-like cells), gastrin (from G cells), and acetylcholine (vagal stimulation). Smoking and stress tap into these pathways - stress via vagal/cholinergic activation, and smoking via direct mucosal and neurochemical effects - making option A the correct answer.
Which treatment is commonly used for severe lupus nephritis? Ответы(один ответ) 1 A. NSAIDs only 2 C. Immunosuppressive therapy 3 E. Diuretics only 4 D. Antibiotics 5 B. Antihistamines
Answer: 2) C. Immunosuppressive therapy
Severe lupus nephritis (particularly Class III, IV, and V per ISN/RPS classification) requires immunosuppressive therapy to suppress the autoimmune-mediated glomerular damage.
Standard treatment regimen:
| Phase | Treatment |
|---|---|
| Induction | High-dose corticosteroids (IV methylprednisolone pulse, then oral prednisone) + either Mycophenolate mofetil (MMF) or Cyclophosphamide (IV) |
| Maintenance | Low-dose corticosteroids + MMF or Azathioprine (long-term) |
| Adjunct | Hydroxychloroquine (for all SLE patients), ACE inhibitors/ARBs (renoprotection) |
Why the others are wrong:
- A. NSAIDs only - NSAIDs can actually worsen renal function in lupus nephritis and are contraindicated in significant renal disease
- B. Antihistamines - Have no role in treating lupus nephritis; they target histamine-mediated allergic responses
- D. Antibiotics - Lupus nephritis is autoimmune, not infectious; antibiotics are irrelevant unless treating a concurrent infection
- E. Diuretics only - May help manage edema symptomatically but do nothing to address the underlying immune complex-mediated glomerulonephritis
The pathophysiology involves immune complex deposition in the glomeruli triggering complement activation and inflammatory damage. Only immunosuppression addresses this mechanism, which is why it is the cornerstone of treatment for severe lupus nephritis.
The main route of transmission for Hepatitis B: Ответы(один ответ) 1 B) Blood and body fluids 2 C) Food 3 D) Fecal-oral 4 A) Airborne
Answer: 1) B) Blood and body fluids
Hepatitis B virus (HBV) is transmitted through contact with infected blood and body fluids. It is a parenteral/bloodborne pathogen.
Main routes of HBV transmission:
| Route | Examples |
|---|---|
| Percutaneous | Needlestick injuries, IV drug use, tattooing, piercing |
| Sexual | Unprotected intercourse (HBV is present in semen and vaginal secretions) |
| Perinatal | Mother-to-child transmission during childbirth (most common route in endemic areas) |
| Blood transfusion | Unscreened blood products (now rare in developed countries) |
Why the others are wrong:
- A. Airborne - HBV does not survive in aerosol form; this is the route for diseases like TB, measles, and chickenpox
- C. Food - Food-borne transmission does not occur with HBV
- D. Fecal-oral - This is the route for Hepatitis A and Hepatitis E, not HBV. Fecal-oral diseases spread via contaminated water/food
Key facts about HBV:
- HBV is 50-100x more infectious than HIV via needlestick
- The virus can survive on surfaces for up to 7 days
- Prevention: HBV vaccine (highly effective), safe sex, needle exchange programs, screening of blood products, and post-exposure prophylaxis with HBIG + vaccine
Which antibody is highly specific for SLE? Ответы(один ответ) 1 A. Anti-centromere 2 D. Anti-Jo-1 3 B. Anti-Scl-70 4 C. Anti-dsDNA 5 E. Anti-mitochondrial
Answer: 4) C. Anti-dsDNA
Anti-double-stranded DNA (anti-dsDNA) antibodies are highly specific for Systemic Lupus Erythematosus (SLE) and are one of the hallmark diagnostic markers of the disease.
Autoantibody quick-reference table:
| Antibody | Associated Disease | Notes |
|---|---|---|
| Anti-dsDNA | SLE | ~70% sensitivity, >95% specificity; titres correlate with disease activity, especially lupus nephritis |
| Anti-Smith (anti-Sm) | SLE | Even more specific (~99%) but less sensitive (~25%) |
| Anti-centromere | Limited cutaneous systemic sclerosis (CREST syndrome) | Option A |
| Anti-Scl-70 (anti-topoisomerase I) | Diffuse systemic sclerosis | Option B |
| Anti-Jo-1 | Polymyositis / Dermatomyositis | Associated with antisynthetase syndrome |
| Anti-mitochondrial (AMA) | Primary biliary cholangitis (PBC) | Option E |
Why anti-dsDNA is the answer:
- It is included in both the ACR and EULAR/ACR 2019 classification criteria for SLE
- Titres rise and fall with disease flares, making it useful for monitoring disease activity
- High levels strongly correlate with lupus nephritis development
Note: ANA (antinuclear antibody) is the best screening test for SLE (~95% sensitive) but is not specific - it can be positive in many other conditions. Anti-dsDNA and anti-Sm are the specific confirmatory markers.
The most common viral hepatitis types are: Ответы(один ответ) 1 C) Only A and D 2 A) A, B, C, D, E 3 B) F, G, H 4 D) Z and X
Answer: 2) A) A, B, C, D, E
The five well-established and clinically recognized viral hepatitis types are A, B, C, D, and E.
Overview of each type:
| Type | Virus | Transmission | Chronicity | Key Feature |
|---|---|---|---|---|
| Hep A (HAV) | Picornavirus (ssRNA) | Fecal-oral | Never chronic | Self-limiting; vaccine available |
| Hep B (HBV) | Hepadnavirus (dsDNA) | Blood/body fluids, perinatal | Yes (~5-10% adults, ~90% neonates) | Vaccine available; can lead to cirrhosis/HCC |
| Hep C (HCV) | Flavivirus (ssRNA) | Blood (IV drug use, transfusions) | Yes (~75-85%) | No vaccine; curable with DAAs |
| Hep D (HDV) | Deltavirus (ssRNA) | Blood/body fluids | Yes | Requires HBV co-infection to replicate |
| Hep E (HEV) | Hepevirus (ssRNA) | Fecal-oral | Rarely (immunocompromised) | Dangerous in pregnancy (high mortality) |
Why the others are wrong:
- B. F, G, H - These are not recognized standard hepatitis classifications. Hepatitis G (GBV-C) exists but is not considered a true hepatitis virus causing significant liver disease
- C. Only A and D - Incomplete; all five types are clinically significant
- D. Z and X - These do not exist; entirely fictitious designations
Memory tip: Think of the transmission routes in two groups:
- Fecal-oral ("vowels"): Hep A and Hep E
- Blood/body fluids ("consonants"): Hep B, C, and D
Which manifestation is typical of SLE? A. B. C. D. E. Ответы(один ответ) 1 Butterfly (malar) rash 2 Muscle atrophy only 3 Thickened skin of fingers 4 Digital ulcers only 5 Gottron’s papules
Answer: 1) Butterfly (malar) rash
The butterfly (malar) rash is the classic and most recognizable cutaneous manifestation of SLE, appearing in approximately 50% of patients.
Why it is characteristic of SLE:
- Erythematous rash spreading across both cheeks and the nasal bridge in a "butterfly" pattern
- Spares the nasolabial folds (important distinguishing feature)
- Triggered or worsened by sun exposure (photosensitivity)
- Included in the ACR/EULAR 2019 classification criteria for SLE
Why the others are wrong:
| Option | Actual Associated Condition |
|---|---|
| Muscle atrophy only | Non-specific; not a defining feature of SLE. SLE can cause myositis but not isolated muscle atrophy |
| Thickened skin of fingers (sclerodactyly) | Hallmark of Systemic Sclerosis (Scleroderma) |
| Digital ulcers only | Typical of Systemic Sclerosis and severe Raynaud's phenomenon |
| Gottron's papules | Pathognomonic for Dermatomyositis - violaceous papules over the knuckles |
Other classic SLE manifestations to remember (SOAP BRAIN MD):
- Serositis, Oral ulcers, Arthritis, Photosensitivity
- Blood disorders (hemolytic anemia, thrombocytopenia), Renal disease, ANA positive, Immunologic (anti-dsDNA, anti-Sm), Neurological
- Malar rash, Discoid rash
The malar rash remains the most visually distinctive and commonly tested feature of SLE.
Hepatitis C virus belongs to which family? Ответы(один ответ) 1 C) Adenovirus 2 B) Flavivirus 3 A) Retrovirus 4 D) Herpesvirus
Answer: 2) B) Flavivirus
Hepatitis C virus (HCV) belongs to the family Flaviviridae, genus Hepacivirus.
HCV virology at a glance:
| Property | Detail |
|---|---|
| Family | Flaviviridae |
| Genus | Hepacivirus |
| Genome | Single-stranded, positive-sense RNA (+ssRNA) |
| Envelope | Enveloped virus |
| Size | ~50-80 nm |
| Genotypes | 7 major genotypes (1-7); genotype 1 most common worldwide |
Why the others are wrong:
| Option | Actual Family Members |
|---|---|
| A. Retrovirus | HIV, HTLV - characterized by reverse transcriptase converting RNA to DNA |
| C. Adenovirus | Adenoviridae - dsDNA virus causing respiratory, GI, and eye infections |
| D. Herpesvirus | Herpesviridae - dsDNA viruses including HSV-1/2, VZV, CMV, EBV |
Other Flaviviridae members to remember:
- Dengue virus
- Yellow fever virus
- Zika virus
- West Nile virus
- Japanese encephalitis virus
Clinical relevance of HCV:
- Transmitted primarily through blood (IV drug use, unscreened transfusions)
- ~75-85% of infections become chronic
- Leading cause of liver cirrhosis and hepatocellular carcinoma requiring transplant
- Now curable with direct-acting antivirals (DAAs) achieving >95% sustained virologic response (SVR)
- No vaccine currently available (high mutation rate due to error-prone RNA polymerase)
Which skin manifestation is most typical of dermatomyositis? Ответы(один ответ) 1 D. Psoriatic plaques 2 B. Gottron’s papules 3 A. Butterfly rash 4 C. Erythema nodosum 5 E. Livedo reticularis
Answer: 2) B. Gottron's papules
Gottron's papules are pathognomonic for dermatomyositis - meaning their presence alone is virtually diagnostic of the condition.
Description of Gottron's papules:
- Violaceous (purple-red) to erythematous, flat-topped papules
- Located over the dorsal surface of the metacarpophalangeal (MCP) and interphalangeal (IP) joints
- May also appear over elbows, knees, and medial malleoli
- Can be scaly and are often associated with periungual telangiectasias
Other classic skin findings in dermatomyositis:
| Sign | Description |
|---|---|
| Heliotrope rash | Violaceous discoloration around the eyes with periorbital edema |
| Shawl sign | Erythema over the upper back, shoulders, and posterior neck |
| V-sign | Erythema over the anterior chest/neck in a V-shape |
| Mechanic's hands | Roughened, cracked skin on the lateral fingers |
| Gottron's sign | Macular erythema (without papules) over the same bony prominences |
Why the others are wrong:
| Option | Actual Associated Condition |
|---|---|
| A. Butterfly rash | Pathognomonic for SLE |
| C. Erythema nodosum | Associated with sarcoidosis, IBD, streptococcal infections, TB |
| D. Psoriatic plaques | Pathognomonic for Psoriasis |
| E. Livedo reticularis | Associated with antiphospholipid syndrome, SLE, vasculitis |
Key clinical point: Dermatomyositis is also associated with an increased risk of underlying malignancy (particularly ovarian, lung, GI cancers), so all newly diagnosed patients require age-appropriate cancer screening.
Chronic hepatitis most commonly results from: Ответы(один ответ) 1 C) Hepatitis D only 2 A) Hepatitis A 3 B) Hepatitis B and C 4 D) Hepatitis E
Answer: 3) B) Hepatitis B and C
Hepatitis B and C are the leading causes of chronic hepatitis worldwide, together accounting for the vast majority of chronic liver disease, cirrhosis, and hepatocellular carcinoma (HCC).
Chronicity rates by hepatitis type:
| Type | Chronicity Rate | Notes |
|---|---|---|
| Hepatitis A | 0% - Never chronic | Always self-limiting acute infection |
| Hepatitis B | 5-10% in adults; 90% in neonates | Higher chronicity with younger age at infection |
| Hepatitis C | 75-85% | Highest chronicity rate of all hepatitis viruses |
| Hepatitis D | Yes, but only with HBV co-infection | Cannot cause chronic disease independently |
| Hepatitis E | Rarely chronic (~1-3% in immunocompromised) | Essentially self-limiting like HAV |
Why the others are wrong:
- A. Hepatitis A - Always acute and self-limiting; never progresses to chronic hepatitis. No carrier state exists.
- C. Hepatitis D only - HDV requires HBV to replicate (it is a defective/satellite virus). It cannot cause chronic hepatitis independently, and is far less prevalent than HBV/HCV.
- D. Hepatitis E - Like HAV, it is primarily self-limiting. Only rarely causes chronic infection in solid organ transplant recipients and other immunocompromised patients.
Global burden of chronic HBV and HCV:
- ~296 million people live with chronic HBV globally
- ~58 million people live with chronic HCV globally
- Together they cause ~1.1 million deaths per year (WHO, 2019)
- Both are major drivers of cirrhosis and hepatocellular carcinoma
Key difference in management:
- Chronic HBV: Suppressed but not cured with antivirals (tenofovir, entecavir)
- Chronic HCV: Curable with 8-12 weeks of direct-acting antivirals (DAAs) with >95% SVR
The most reliable marker of active Hepatitis B infection: Ответы(один ответ) 1 D) HBeAb 2 A) Anti-HBs 3 B) HBsAg 4 C) Anti-HBc
Answer: 3) B) HBsAg
HBsAg (Hepatitis B surface antigen) is the most reliable and earliest marker of active Hepatitis B infection - its presence indicates that the person is currently infected and potentially infectious to others.
Complete HBV serology interpretation:
| Marker | What It Means | Clinical Significance |
|---|---|---|
| HBsAg | Surface antigen of HBV | Active infection (acute or chronic); first marker to appear (4-12 weeks post-exposure) |
| Anti-HBs | Antibody to surface antigen | Immunity - from vaccination or recovery from past infection |
| Anti-HBc IgM | Antibody to core antigen (IgM) | Acute HBV infection; also positive in "window period" |
| Anti-HBc IgG | Antibody to core antigen (IgG) | Past exposure (remains positive for life) |
| HBeAg | "e" antigen | High viral replication and high infectivity |
| Anti-HBe (HBeAb) | Antibody to "e" antigen | Decreasing viral replication; lower infectivity |
| HBV DNA | Viral load | Most direct measure of viral replication |
Why the others are wrong:
- A. Anti-HBs - Indicates immunity, either from vaccination or resolved past infection. Its presence means the infection is OVER or was never present.
- C. Anti-HBc - IgM form suggests acute infection, but IgG form simply indicates past exposure. Neither is as directly reliable as HBsAg for confirming active current infection.
- D. HBeAb (Anti-HBe) - Indicates seroconversion and declining infectivity; suggests infection is being controlled.
Key clinical scenarios:
| Scenario | HBsAg | Anti-HBs | Anti-HBc |
|---|---|---|---|
| Acute infection | + | - | IgM + |
| Chronic infection | + | - | IgG + |
| Recovered | - | + | IgG + |
| Vaccinated | - | + | - |
| Window period | - | - | IgM + |
HBsAg persisting for >6 months defines chronic Hepatitis B infection.
Which renal condition is most closely associated with gout? Ответы(один ответ) 1 A. Nephrotic syndrome 2 D. Polycystic kidney disease 3 C. Uric acid nephrolithiasis 4 B. Acute tubular necrosis 5 E. Glomerulonephritis
Answer: 3) C. Uric acid nephrolithiasis
Uric acid nephrolithiasis (kidney stones made of uric acid) is the renal condition most directly and closely associated with gout, as both share the same underlying pathology - hyperuricemia (elevated serum uric acid).
The gout-kidney connection:
Gout results from the deposition of monosodium urate (MSU) crystals in joints and soft tissues due to chronically elevated uric acid. The same hyperuricemia drives uric acid stone formation in the kidneys.
| Renal Manifestation of Gout | Mechanism |
|---|---|
| Uric acid nephrolithiasis | Supersaturation of urine with uric acid leads to crystal precipitation; acidic urine (low pH) promotes stone formation |
| Gouty nephropathy (urate nephropathy) | Chronic MSU crystal deposition in renal interstitium causes interstitial nephritis and progressive CKD |
| Acute uric acid nephropathy | Massive uricosuria (e.g., tumor lysis syndrome) causes intratubular crystal obstruction and acute kidney injury |
Uric acid stones - key facts:
- Account for ~10% of all kidney stones
- Radiolucent on plain X-ray (unlike calcium oxalate stones)
- Visible on CT scan and ultrasound
- Favored by: acidic urine (pH <5.5), low urine volume, hyperuricosuria
- Treated/prevented with: hydration, urinary alkalinization (potassium citrate, sodium bicarbonate), allopurinol
Why the others are wrong:
| Option | Actual Association |
|---|---|
| A. Nephrotic syndrome | Associated with diabetes, minimal change disease, membranous nephropathy, amyloidosis |
| B. Acute tubular necrosis | Caused by ischemia, nephrotoxins (aminoglycosides, contrast, myoglobin) |
| D. Polycystic kidney disease | Autosomal dominant/recessive genetic disorder; not related to uric acid metabolism |
| E. Glomerulonephritis | Associated with SLE, IgA nephropathy, post-streptococcal infection, vasculitis |
Memory tip: Gout = uric acid excess in joints. The same excess in kidneys = uric acid stones. Same cause, different organ target.
Limited cutaneous systemic sclerosis (CREST syndrome) includes all EXCEPT: Ответы(один ответ) 1 E. Renal crisis 2 A. Calcinosis 3 B. Raynaud phenomenon 4 D. Sclerodactyly 5 C. Esophageal dysmotility
Answer: 1) E. Renal crisis
Renal crisis is not part of CREST syndrome. It is characteristically associated with diffuse cutaneous systemic sclerosis, not the limited form.
CREST syndrome - the acronym explained:
| Letter | Feature | Description |
|---|---|---|
| C | Calcinosis | Calcium deposits in skin and soft tissues, especially fingers |
| R | Raynaud phenomenon | Episodic vasospasm of digits triggered by cold/stress; often the earliest manifestation |
| E | Esophageal dysmotility | Impaired peristalsis causing dysphagia and GERD; most common internal organ involved |
| S | Sclerodactyly | Thickening and tightening of skin of the fingers |
| T | Telangiectasias | Dilated small blood vessels visible on skin and mucous membranes |
Limited vs. Diffuse systemic sclerosis - key differences:
| Feature | Limited (CREST) | Diffuse |
|---|---|---|
| Skin involvement | Distal to elbows/knees, face | Proximal + trunk |
| Renal crisis | Rare | Classic complication |
| Pulmonary hypertension | More common | Less common |
| Interstitial lung disease | Less common | More common |
| Antibody | Anti-centromere | Anti-Scl-70 (topoisomerase I) |
| Prognosis | Better | Worse |
Why renal crisis belongs to diffuse sclerosis:
- Scleroderma renal crisis is caused by intimal hyperplasia of renal vessels leading to malignant hypertension and rapidly progressive renal failure
- It occurs in ~15% of diffuse systemic sclerosis patients
- Treated with ACE inhibitors (captopril), which dramatically improved outcomes
- Its rarity in limited disease is why it is the "EXCEPT" answer here
Duodenal ulcer pain usually occurs: Ответы(один ответ) 1 B) 2–3 hours after meals and relieved by food 2 C) Unrelated to meals 3 A) Immediately after meals 4 D) Only at night
Answer: 1) B) 2–3 hours after meals and relieved by food
This is the classic pain pattern of duodenal ulcer - it occurs when the stomach empties and acid reaches the unprotected duodenal mucosa, and is relieved when food buffers the acid.
Pathophysiology of the pain pattern:
- Patient eats a meal → food buffers gastric acid → pain-free period
- 2-3 hours later → stomach empties → acid passes into duodenum → contacts ulcerated mucosa → pain begins
- Patient eats again or takes antacids → acid buffered → pain relieved
This creates the classic "hunger pain" or "food-relief" pattern, and patients often describe eating as making them feel better.
Duodenal ulcer vs. Gastric ulcer pain comparison:
| Feature | Duodenal Ulcer | Gastric Ulcer |
|---|---|---|
| Pain timing | 2-3 hours after meals | Shortly after meals (30-60 min) |
| Effect of food | Relieves pain | Worsens pain |
| Night pain | Common (wakes patient 12-3 AM) | Less common |
| Weight | Maintained or gained | Often lost (fear of eating) |
| H. pylori | ~95% associated | ~70% associated |
| Location | Epigastric, may radiate to back | Epigastric |
Why the others are wrong:
- A. Immediately after meals - This pattern is typical of gastric ulcer, not duodenal
- C. Unrelated to meals - Peptic ulcer pain is characteristically meal-related; meal-unrelated epigastric pain suggests other diagnoses (functional dyspepsia, biliary colic, pancreatitis)
- D. Only at night - Night pain does occur in duodenal ulcers (classically waking patients at 12-3 AM when acid peaks), but it is not the only time pain occurs; it also happens 2-3 hours after daytime meals
Key associated facts:
- Most common cause: H. pylori infection (~95%) and NSAIDs
- Diagnosis: Upper GI endoscopy (gold standard)
- Treatment: Triple therapy (PPI + clarithromycin + amoxicillin) for H. pylori eradication + PPI for 4-8 weeks
Which comorbidity is most commonly associated with gout? Ответы(один ответ) 1 B. Hypothyroidism 2 A. Asthma 3 C. Metabolic syndrome 4 E. Osteoporosis 5 D. Multiple sclerosis
Answer: 3) C. Metabolic syndrome
Metabolic syndrome is the most commonly and strongly associated comorbidity with gout, sharing the same underlying metabolic disturbances that drive hyperuricemia.
Why metabolic syndrome and gout are so closely linked:
Metabolic syndrome consists of a cluster of conditions that all independently raise uric acid levels:
| Component of Metabolic Syndrome | Effect on Uric Acid |
|---|---|
| Obesity | Increased purine turnover; increased uric acid production |
| Insulin resistance/Type 2 diabetes | Insulin reduces renal uric acid excretion; hyperinsulinemia = hyperuricemia |
| Hypertension | Reduced renal blood flow decreases uric acid excretion; thiazide diuretics raise uric acid |
| Hypertriglyceridemia | Competes with uric acid for renal tubular secretion |
| Dyslipidemia (low HDL) | Independently associated with elevated uric acid |
Comorbidity prevalence in gout patients:
- ~75% have hypertension
- ~75% have chronic kidney disease (stages 1-3)
- ~50% have metabolic syndrome
- ~25% have type 2 diabetes
- ~14% have cardiovascular disease
Why the others are wrong:
| Option | Relationship to Gout |
|---|---|
| A. Asthma | No established metabolic link to hyperuricemia |
| B. Hypothyroidism | Can mildly raise uric acid (reduces renal excretion), but is not the most common or primary comorbidity |
| D. Multiple sclerosis | Autoimmune neurological disease; no association with uric acid metabolism |
| E. Osteoporosis | No direct metabolic link; if anything, higher uric acid may have mild antioxidant effects on bone |
Clinical takeaway: Every gout patient should be screened for the full metabolic syndrome cluster - hypertension, dyslipidemia, diabetes, and obesity - as treating these comorbidities also helps control hyperuricemia and reduces cardiovascular risk, which is the leading cause of death in gout patients.
A typical lipid abnormality in metabolic syndrome is: Ответы(один ответ) 1 D) Low LDL 2 A) Low triglycerides 3 B) High HDL 4 C) High triglycerides and low HDL
Answer: 4) C) High triglycerides and low HDL
This dyslipidemia pattern is the hallmark lipid abnormality of metabolic syndrome and is directly driven by insulin resistance.
Diagnostic criteria for metabolic syndrome (ATP III / IDF):
| Component | Threshold |
|---|---|
| Waist circumference | >102 cm (men), >88 cm (women) |
| Triglycerides | ≥150 mg/dL (1.7 mmol/L) |
| HDL cholesterol | <40 mg/dL (men), <50 mg/dL (women) |
| Blood pressure | ≥130/85 mmHg |
| Fasting glucose | ≥100 mg/dL |
3 of 5 criteria required for diagnosis
Why insulin resistance causes this specific lipid pattern:
| Mechanism | Result |
|---|---|
| Insulin resistance → increased lipolysis in adipose tissue → excess free fatty acids delivered to liver | Liver overproduces VLDL → high triglycerides |
| High VLDL triglycerides exchange with HDL particles via CETP | HDL becomes triglyceride-rich → cleared faster by hepatic lipase → low HDL |
| Small dense LDL particles formed | More atherogenic LDL (LDL quantity may be normal but quality is worse) |
Why the others are wrong:
| Option | Why Incorrect |
|---|---|
| A. Low triglycerides | Opposite of what occurs; high TG is a defining feature |
| B. High HDL | Opposite of what occurs; low HDL is a defining feature |
| D. Low LDL | LDL is typically normal or mildly elevated in metabolic syndrome; it is NOT characteristically low |
Clinical importance of this lipid pattern:
- High TG + low HDL + small dense LDL = atherogenic dyslipidemia
- Strongly predicts cardiovascular disease risk independent of total cholesterol
- Treated with: lifestyle modification (first line), fibrates (best for TG), niacin, omega-3 fatty acids
- Statins address LDL but have modest effects on TG/HDL in this pattern
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