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UWORLD
Overall review 3
Question | Answer |
---|---|
What is Rituximab? | Monoclonal antibody directed against the CD20 antigen |
What is the CD to which Rituximab is directed against? | CD20 |
What common drug is used in non-Hodgkin lymphomas that has proven efficacy? | Rituximab |
What substances' concentration increase as they travel along the proximal tubule? | Creatinine and Urea |
Do the concentrations of bicarbonate, glucose, and amino acids, increase or decrease as they travel along the proximal tubule in the nephron? | Decrease |
What are some common substances that decrease concentration as they travel along the proximal tubule of the nephron? | Bicarbonate, glucose, and amino acids |
Which electrolytes have no change in concentration as they travel along the PCT of nephron? | Sodium and Potassium |
Which substances are the ones with the lowest concentration as they travel along the PCT? | Glucose and amino acids |
Does creatinine or urea has a higher concentration as the length of the PCT travel increases? | Creatine |
Are most malignant pleural effusion exudative or transudative? | Exudative |
What are some ways that exudative pleural effusions form in malignancies? | 1. Inflammation-induced increase in vascular permeability (leading to increase inflow), 2. Blockage of pleural fluid reabsorption by Parietal pleura lymphatics (leading to decreased outflow |
What causes the increase inflow of fluid leading the exudative plural effusions in cancer patients? | Inflammation-induced increase in vascular permeability |
What are some common cell adhesion molecules? | Fibronectin, collagen, and laminin |
What is the process of adhesion of cells? | Cells adhere to extracellular matrix involves integrin-mediated binding to fibronectin, collagen, and laminin |
What type of hormone is insulin? | Anabolic hormone that acts via receptor Tyrosine kinase to increase the synthesis of glycogen, proteins, fatty acids, and nucleic acids |
What enzyme aids the functioning of insulin? | Receptor Tyrosine kinase |
How is the rash of measles? | Maculopapular rash that starts on the face and spreads downwards |
What is pathognomonic of Measles? | Koplik spots |
How are the Koplik spots? | Tiny white or blue-gray lesions on the buccal mucosa |
What disease is associated with Koplik spots? | Measles |
What the most characteristic imaging finding of Toxoplasmosis? | Multiple ring-enhancing lesions in the brain |
What are some clinical features of Toxoplasmosis? | Multiple ring enhancing lesions in brain imaging, seizures, and headaches |
What are the penicillin-binding proteins to which Cephalosporins and penicillin bind to? | Transpeptidases |
What are Transpeptidase? | Penicillin-binding proteins |
What type of drugs use Transpeptidases in order to function? | Penicillins and Cephalosporins |
What is a common way a Cephalosporin acquires antibiotic resistance? | A change in PBP structure that blocks the cephalosporin binding site |
What type of antibodies are created by cold agglutinins? | IgM antibodies |
What is common cause of CAP that result in cold agglutinins? | Mycoplasma pneumoniae |
Cold agglutinins = | IgM antibodies |
How do cold agglutinins work? | Bind to RBCs and cause clumping/agglutinations at low body temperatures |
What are conditions leading to cold agglutin formation? | Mycoplasma pneumoniae infection, infectious mononucleosis and some hematologic malignancies |
What type of virus causes Molluscum contagiosum? | Poxvirus |
How is Mollluscum contagiousum presented? | Small, firm, round, papules that often have a central umbilication |
Who are at greater risk for Molluscum contagiosum? | Immunocompromised (HIV) and sexually active |
What are the histological findings of Molluscum contagiosum biopsy? | Intracytoplasmic Eosinophilic inclusion bodies of poxvirus in keratinocytes |
What pathogens cause purely toxin-mediated watery diarrhea? | V. cholerae and Enterotoxigenic E. coli |
What is the result of ETEC or V. choleare not causing cell death by toxins? | No erythrocytes and no leukocytes are noted on stool microscopy |
What are the stool microscopic findings of dysentery? | - Fecal polymorphonuclear WBCs - +/- RBCs |
What pathogen causes Enteric fever? | Salmonella typhi |
What are the classic stool microscopic findings of Enteric fever? | Fecal mononuclear WBCs |
What is the MOA of Sulfonylureas? | Inhibit ATP-sensitive potassium channels on the pancreatic B-cell membrane, inducing depolarization and L-type Calcium channel opening |
Which calcium channels are opened with Sulfonylureas? | L-type calcium channels |
What is the result of increased calcium influx into Pancreatic B-cells by Sulfonylureas? | Increase insulin release independent of blood glucose concentrations |
Is the release of insulin by Pancreatic B-cell by Sulfonylurea therapy, dependent or independent, of serum glucose concetration? | Independent from glucose concentration in blood |
What is a possible dangerous adverse effect of Sulfonylureas? | Hypoglycemia |
Why are sulfonylureas often causative of hypoglycemia? | They induce release of insulin by pancreas despite low serum glucose concentration |
What is Gynecomastia? | Development of glandular breast tissue in males |
Which SERM is known to reduce risk of gynecomastia? | Tamoxifen |
Which type of male are at higher risk of developing gynecomastia? | Men receiving androgen deprivation therapy for prostate cancer |
What is Phentermine? | Norepinephrine-releasing agent |
Sympathomimetic weight loss drug indicated for short-term treatment of obesity | Phentermine |
How does Phentermine work? | Stimulate and inhibit the reuptake of norepinephrine |
What is COX-2? | Inducible enzyme upregulated during inflammation by IL-1 and TNF-alpha |
Common selective COX-2 inhibitor | Celecoxib |
How do Selective COX 2 inhibitors work? | Decrease inflammation by inhibiting COX-2 production of proinflammatory arachidonic acid metabolites |
Why are COX-2 inhibitors often used in patients with PUD? | Since they do not affect COX-1, they have minimal gastroduodenal toxicity |
Proinflammatory cytokines: | IL-1 and TNF-alpha |
What is PD-L1 role in T-cell exhaustion? | PD-L1 binds to PD-1 on cytotoxic CD8+ T-cells, resulting in inhibiting their response |
What is a common way that cancer cell may avoid immune recognition by T-cells? | Overexpressing PD-L1, leading to PD-1 binding to PD-L1, and inhibiting CD8+ activity |
What Ligand is associated with CD8+ T-cell exhaustion, leading cancer cells to evade immune response? | Programmed Death-Ligand 1 (PD-L1) |
What is Mycophenolate? | Immunosuppressive drug that inhibits inosine 5'-monophosphate dehydrogenase in the denovo purine synthesis pathway |
Does Mycophenolate affect the de novo purine or pyrimidine synthesis pathway? | De novo Purine synthesis pathway |
Which enzyme is inhibited by Mycophenolate? | Inosine 5'-monophosphate dehydrogenase |
What common immunosuppressive drug is known to inhibit inosine 5'-monophosphate dehydrogenase | Mycophenolate |
What is the reason the Mycophenolate is a distinctive immunosuppressive drug? | Specific suppression to lymphocyte proliferation, due to activated lymphocytes lack an established purine salvage pathway, that is present in other hematopoietic cell lines |
What drug is used to treat Methanol or ethylene glycol intoxication? | Fomepizole |
What is the MOA of Fomepizole? | Competitive inhibitor of alcohol dehydrogenase |
A competitive inhibitor would (pharmacokinetic): | Increase Km without reducing Vmax |
Is Km or Vmax increased with a competitive inhibitor? | Km |
What is the change in Vmax with a competitive inhibitor? | None: Vmax is not altered |
What is the expected shifting on the curve caused by an increase in Km? | Right shift of the curve |
If the Km of a drug is increased, it is expected for the graphed curve to shift to the right or left? | Right |
What type of metabolic acidosis is caused by Ethylene glycol and methanol? | Anion gap metabolic acidosis |
What type of intoxication is known to result in anion gap metabolic acidosis and elevated osmolar gap? | Ethylene glycol and methanol |
What does the use of Fomepizole help in methanol and ethylene glycol toxicity? | Reduces the rate of conversion of the alcohol into their toxic metabolites |
If methanol and ethylene glycol are relative harmless in respect to toxicity, why then the use of fomepizole? | Both create highly toxic metabolites by enzymatic action of alcohol dehydrogenase and aldehyde dehydrogenase |
What is a common anticancer drug associated with development of Dilated Cardiomyopathy? | Trastuzumab |
What is Trastuzumab? | Monoclonal antibody that blocks HER-2 to disrupt malignant cell signaling and encourage apoptosis |
What is an indirect role of HER-2? | Helps preserve cardiomyocyte function |
How is DCM due to Trastuzumab presented? | Decrease in myocardial contractility without cardiomyocyte destruction or myocardial fibrosis |
What is Tocolysis? | Inhibition of uterine contractions |
What causes inhibition of uterine contractions? | B2-adrenergic receptor stimulation |
What is the ocular (eye) effects of Alpha-1 receptor stimulation? | Contraction of the ocular pupillary dilator muscle, resulting in mydriasis (pupillary dilation) |
What disease is due to antibodies against hemidesmosomes ? | Bullous pemphigoid |
Where is the location at which hemidesmosomes are attacked by autoantibodies in Bullous pemphigoid? | Basement membrane of the Dermal-epidermal junction |
What is the consequence of antibodies attacking hemidesmosomes in Bullous pemphigoid? | The entire epidermis separates from the dermis and form tense, subepidermal blisters |
Suprasellar pituitary tumor | Craniopharyngioma |
What is a Craniopharyngioma? | Suprasellar tumor found in children and composed of calcified cysts containing cholesterol crystals |
What is the composition of a Craniopharyngioma? | Calcified cyst containing cholesterol crystals |
A craniopharyngioma is a derivation of which embryonic tissue? | Remnants of Rathke's pouch |
What is a common embryonic precursor of the anterior pituitary? | Rathke's pouch |
What cranial tumor, especially pituitary tumor, is seen as a derivative of the remnants of the Rathke pouch? | Craniopharyngioma |
What is the MCC of Subdural hematoma? | Rupture of Cortical bridging veins |
How is a Subdural hematoma (SAH) often clinically presented? | Gradual onset of headache and confusion |
If the patient presents with a gradual onset of headache and confusion, it is more likely to be an Epidural or Subdural hematoma? | Subdural hematoma |
What is the classic shape of the Subdural hematoma in a CT? | Crescent-shaped mass (hemorrhage) |
What is the MCC of an Epidural hematoma? | Rupture of the MMA (middle meningeal artery) |
What is the CT classic finding of an epidural hematoma? | Biconvex hematoma |
What are the key clinical features or symptoms presented by a patient with Epidural hematoma? | "lucid interval", followed by a loss of consciousness |
What is Sarcoidosis? | CD4+ T cell mediated disease, in which large numbers of CD4+ lymphocytes release IFN-gamma and TNF-alpha to drive macrophage activation and granuloma formation |
Is Sarcoidosis, CD4+ and CD8+, mediated disease? | CD4+ mediated |
In Sarcoidosis, what cytokines are secreted by CD4+ T lymphocytes? | IFN-gamma and TNF-alpha |
What are the findings in bronchoalveolar lavage fluid in pulmonary sarcoidosis? | Lymphocytic predominance with a HIGH CD4+/CD8+ ratio |
What condition is associated with an high lymphocyte CD4+/CD8+ ratio? | Sarcoidosis |
What are the features shared by all Primary Thrombotic Microangiopathy (TMA) syndromes? | Activation of platelet and diffuse microthrombosis in arterioles and capillaries |
What are common clinical features of TMA syndromes? | Hemolytic anemia with schistocytes, thrombocytopenia, and organ injury (brain , kidneys, and heart) |
What is Follicular Lymphoma? | The most common indolent non-Hodgkin lymphoma in adults |
What are some Follicular lymphoma features and characteristics? | - B-cell origin - Presents with painless waxing and waning (fluctuating) lymphadenopathy |
What is the translocation associated with Follicular lymphoma? | t(14; 18) |
What is the result of the t(14;18)? | Overexpression of the BCL-2 oncogene |
What hematologic malignancy is associated with an overexpression of BCL-2 oncogene? | Follicular lymphoma |
What promotes the formation of Uric acid kidney stones? | 1. Low urine pH (acidic urine) 2. GI bicarbonate loss due to chronic diarrhea |
How does a low urine pH promote formation of uric acid stones? | Increased formation of insoluble uric acid over soluble urate ion |
How does chronic diarrhea promote formation of uric acid stone? | It develops metabolic acidosis due to the loss of bicarbonate and prosecution of acidic urine |
What is the neoplasm most strongly associated with Zollinger-Ellison syndrome? | Gastrinoma |
Which ulcerative condition is strongly associated with Gastrinomas? | Zollinger-Ellison syndrome |
Where are gastrinomas located? | Small intestine/ Pancreas |
What are the clinical signs and symptoms caused by Gastrinomas? | Peptic ulcers (especially in distal doudenum), heartburn, and diarrhea |
Where are ulcers of ZES most likely to develop? | Distal doudenum |
What are some hormonal responses seen with ZES? | Elevated gastrin levels that rise in response to exogenous secretin administration |
In normal gastric G cells, what is the function of Secretin? | Inhibits release of gastrin |
Which cells normally secrete Gastrin in the stomach? | Gastric G cells |
How is atopic dermatitis characterized? | Epidermal barrier dysfunction due to loss-of-function mutations in filaggrin, a key epidermal component |
What protein is very likely to mutated in Atopic Dermatitis? | Filaggrin |
What occurs in Atopic dermatitis in respect to pathogenesis? | Increased transepidermal water loss, skin permeability, and inflammation results in erythematous dry skin and pruritus |
What is the term used to refer to the appearance of skin in atopic dermatitis in chronic disease aggravated by repeated scratching? | Lichenification |
What is the result to a ventricular heart chamber undergoing eccentric ventricular hypertrophy? | Dilated cavity with relatively thin ventricular wall due to addition of myocardial contractile fibers in series |
In a dilated ventricle due to eccentric hypertrophy, why are the ventricular wall relatively thin? | Due to myocardial contractile fibers added in series in response to volume overload |
A heart problem, that leads to a volume overload problem, will present eccentric or concentric ventricular hypertrophy? | Eccentric ventricular hypertrophy |
What is the result of chronic aortic regurgitation? | Aortic root dilation |
What is the MCC of nephrotic syndrome in children? | Minimal change disease |
What specific protein is loss in urine in a kid with MCD? | Albumin |
What is the result of hypoalbuminemia in nephrotic syndromes? | Reduced plasma oncotic pressure, which causes a fluid shift into the interstitial spaces, leading to edema |
A reduction of plasma oncotic pressure, leads to fluid to flow in or out the cell? | Out the cell and into the interstitial space |
What is the result of increased fluid in the interstitial space? | Edema |
What is the result of hypoalbuminemia, or low-oncotic pressure, on lipid synthesis? | Leads to increased production of lipoproteins in liver (hyperlipidemia) |
In the process of Nephrotic syndrome, the decrease in Oncotic pressure has to results which are: | 1. Increased liver proteins in lipid synthesis ---> hyperlipidemia 2. Hypovolemia and increased ADH and aldosterone --> increased water retention and Na+ ----> edema |
What are two important enzymes involved in DNA synthesis during the S-phase of the cell cycle? | Dihydrofolate reductase and, DNA polymerase |
What is the function of the active form of Rb protein? | Regulates cell cycle progression by preventing transition from the G1 phase to the S-phase |
Is the Rb protein activated in phosphorylated or dephosphorylated form? | Dephosphorylation Rb protein - active |
What does the phosphorylation of the Rb protein causes? | Inactivates the protein, allowing cells to progress thru the G1/S checkpoint and proliferate |
Why is a mutated-phosphorylation of the Rb protein a cause of cancer? | It does not allow malignant cells to stay arrested in the G1/S checkpoint, and instead allows them to advance to S-phase and proliferate |
What are some features or characteristics of REM sleep? | Dreaming and voluntary muscle paralysis, and most often in the final third of the night |
In which third of the night, is a person most likely to be in REM sleep? | Final third |
On which phase, of sleep are nightmares most commonly seen? | REM sleep |
Does a nightmare or night-terror have no recollection of the dream? | Night terror |
Which is a non-REM parasomnia, nightmare or night-terror? | Night terror |
What are some characteristics of Night Terrors? | Incomplete arousals and lack of recall of dream content |
If a kid wakes up in fear, and vividly explains the dream to the mother, is the kid referring to a nightmare or a night terror? | Nightmare |
Husband wakes up wife in the middle of the night because she was clearly having a "bad dream". Upon waking he asks her about it, but she cannot remember anything. Nightmare or night terror? | Night terror |
What are the auscultation findings of Mitral Stenosis? | 1. Loud S1 2. Early diastolic opening snap after S2 3. Low pitched diastolic rumble beast heard at the cardiac apex |
Which cardiac murmur has a Opening snap immediately after S2? | Mitral stenosis |
Auscultation reveals: Loud S1 + Opening snap + diastolic rumble best heart at cardiac apex. Dx? | Mitral stenosis |
What causes the Opening snap in Mitral stenosis? | Sudden opening of the mitral valve leaflets, wh th Left-venctrilcelar pressure fall below the Left atrial pressure at the beginning of diastole |
What is the term used for the sound made when the mitral valves open, as the LV pressure falls below the LA pressure? | Opening snap |
In graphs depicting pressures of the Aorta, Left atrium, and Left ventricle, used in common heart murmurs, what is a good mnemonic to recall the order of valve opening and closing? | "coco" Mitral closes, Aortic opens, Aortic closes, Mitral Opens |
What is a major consequence of atrial remodeling? | Atrial fibrillation |
Conditions such as HF, hypertension, and mitral valve disease often cause atrial structural changes, which may cause which abnormal heart rhythm? | Atrial fibrillation |
On top of atrial remodeling or structural changes, what other factor may lead to propagation of AFIB? | Atrial conduction system changes |
What hormone, secreted by the hypothalamus, regulates the release of TSH? | TRH |
Is the release of TSH controlled by Thyroid hormone, under positive or negative feedback? | Negative feedback |
A small change in Thyroid hormone levels, may represent a large change in: | TSH |
What is the most sensitive test to diagnose primary hypothyroidism? | Serum TSH |
Gilbert syndrome is a hereditary _____________________. | Hyperbilirubinemia |
What type of hyperbilirubinemia is seen in Gilbert syndrome? | Indirect hyperbilirubinemia |
What causes the indirect hyperbilirubinemia in Gilbert syndrome? | Decreased bilirubin conjugation |
What is the clinical profile of a patient with Gilbert syndrome? | Recurrent, self-resolving episodes of scleral icterus and jaundice triggered by stress (illness, infection, trauma) |
What are the ways Calcium efflux is mediated in cardiac cells? | 1. Na+/ Ca2+ exchange pump 2. Sarcoplasmic Ca2+- ATPase pump |
Does calcium efflux from the cardiac cells promote relaxation or contraction? | Relaxation |
IV fluids increase: | Intravascular and left ventricular end-diastolic volumes |
What is the physical effect of increasing preload on the heart? | Stretches the myocardium and increases the end-diastolic sarcomere length, leading to an increase in stroke volume (SV), and cardiac output (CO) by the Franklin-Starling mechanism |
What is the relationship between changes in preload and CO and SV? | An increase in preload will cause an increase in CO and SV |
What is Colonic diverticulosis? | Multiple sac-like outpouching within the sigmoid colon |
What are the MC complication of colonic diverticulosis? | Diverticular bleeding and diverticulitis |
What some common risk factors contributing in development of diverticulosis? | 1. High red meat dietary intake and fat 2. Low fiber diet 3. Obesity and decreased physical activity |
What cranial is affected resulting in hyperacusis? | Facial nerve |
What is hyperacusis? | Increased sensitivity to sound |
What is the complication of damage of CN VII close to origin from the brainstem? | Hyperacusis |
What is angiogenesis? | Process in which new blood vessels are formed |
In what phase of wound healing does angiogenesis takes place mostly? | Proliferation phase |
What are some growth factors that stimulate Angiogenesis? | Fibroblast growth factor (FGF) and VEGF |
What wound healing process is stimulated by FGF and VEGF? | Angiogenesis |
What are physical complications of ALS? | 1. Respiratory failure dueto inspiratory muscle weakness (reduced vital capacity) 2. Expiratory muscle weakness (weak cough) 3 Bulbar dysfunction ( dysphagia, and chronic aspiration) |
What dysfunction causes dysphagia and aspiration in ALS patients? | Bulbar dysfunction |
What type of necrosis is seen in Aortic disserction? | Cystic medial degeneration |
What is the classic histologic finding in aortic dissection? | Cystic medial degeneration |
What occurs due to cystic medial degeneration in aortic dissection? | Collagen, elastin, and smooth muscle are replaced by basophilic mucoid extracellular matrix with elastic tissue fragmentation |
What replaces the collagen, elastin, and smooth muscle of aorta in aortic dissection? | Basophilic mucoid extracellular matrix with elastic tissue fragmentation, and cystic collection mucopolysaccharide |
What causes most commonly Spinal Cord compression? | Local extension of vertebral metastases into the epidural space |
In order to produce Spinal Cord compression due to vertebral metastases, into which area is the malignancy spread? | Epidural space |
What are the early and more common signs and symptoms of Spinal Cord compression? | Severe back pain worse at night, motor weakness, and/or sensory deficits |
What are common risk factors associated with AAA? | 1. Age > 60 2. Smoking, 3. Hypertension 4. Male gender 5. Family hx |
What changes in the vessel cause Abdominal Aortic aneurysm? | Chronic transmural inflammation and extracellular matrix degradation with the wall to the aorta |
AAA is usually below with arterial bodies? | Renal arteries |
What severe, and possibly fatal condition of the aorta is often found below the renal arteries? | Abdominal Aortic aneurysm |
What is Rhabdomyolysis? | Release of intracellular muscle contents (myoglobin, electrolytes) due to myocyte injury |
What are common causes of Rhabdomyolysis? | Crash injury, seizures, or drug use (statins) |
What secretes Heme pigment? | Pigment released from myoglobin after degradation in the kidney |
What condition can be caused by the release of heme pigment? | Toxic tubular cells and can cause acute tubular necrosis |
What is a key vignette UA description of Myoglobinuria? | Positive blood on urine dipstick in the absence of RBCs on microscopic urinalysis |
What are two main causes of Cushing syndrome? | 1. Pituitary adenoma 2. Ectopic (paraneoplastic) ACTH secretion |
What condition is associated with elevated ACTH levels? | Cushing syndrome |
The elevated secretion of ACTH in Cushing syndrome suggest which primary etiology if a high dose dexamethasone test suppresses ACTH secretion? | Pituitary adenoma |
What etiology is suggested or most likely causative of Cushing syndrome, if a high dexamethasone test DOES NOT suppress ACTH secretion? | Ectopic ACTH secretion, most likely due to Small cell Lung cancer |
Which lung malignancy is associated with developing Cushing syndrome, that does not suppress ACTH release with high DEXA test? | Small cell lung cancer |
What is the pathogenesis of Cardiac tamponade? | Restriction of diastolic filling of the right-sided heart chambers, with engorgement and decrease with inspiratory collapse of the IVC |
Which side heart chambers are seen affected by reduced diastolic filling in cardiac tamponade? | Right-sided heart chambers |
What is an important feature involving blood pressure in Cardiac tamponade? | Pulsus paradoxus |
What is 'pulsus paradoxus'? | > 10 mmHg drop in systolic BP during inspiration |
Decrease in BP >10 mmHg during inspiration | Pulsus paradoxus |
Which Starling force is mainly changed or modified in development of Transudative effusions? | Hydrostatic or oncotic pressures |
What are the main conditions that lead to Transudative effusions development? | Heart failure (HF), cirrhosis, and nephrotic syndrome |
What is the most common cause of Exudative effusions? | Inflammation and consequent increase vascular membrane permeability |
What are conditions often associated with Exudative effusions? | Infection, malignancy, and rheumatic diseases |
Transudative or Exudative effusion. High ratio of pleural fluid to serum total protein (>0.5) | Exudative effusion |
Transudative or Exudative effusion. High ratio of pleural fluid to lactate dehydrogenase (>0.6) | Exudative effusion |
Which type of effusion is expected to bee seen in a patient with high absolute levels o f lactate dehydrogenase? | Exudative effusion |
A patient with an reduced ejection fraction, and dyspnea, is likely to to develop transudative or exudative pleural effusion? | Transudative effusion |
AAT-1 deficiency patient with abnormal AST/ALT, will most likely develop transudative or exudative effusion? | Transudative effusion |
Which levels are measured to definice either transudative or exudative effusion? | Serum total protein and Lactate Dehydrogenase in relation to pleural fluid level |
How is VSD auscultation description? | Harsh, holosystolic murmur of the LLSB |
What is the anatomical site best to auscult a VSD? | Lower Left Sternal Border (LLSB) |
Which chamber of the heart is seen with an increased oxygen saturation in setting of VSD? | Right-ventricle |
What producers the increase in oxygen saturation seen in the RV seen in VSD? | Left-to-Right shunt of oxygenated blood from the Left ventricle to the right ventricle |