Hemodynamic disorders Practice Questions
19 free Hemodynamic disorders practice questions for the USMLE Step 1. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which term describes the accumulation of excess fluid in the interstitial tissue spaces due to hemodynamic imbalance?
- A Thrombosis
- B Edema
- C Hyperemia
- D Embolism
Correct answer: Edema
Edema refers to increased fluid in interstitial spaces or body cavities due to disturbances in vascular hydrostatic/osmotic pressures, lymphatic drainage, or vascular permeability.
Which mechanism does NOT typically contribute to the development of edema?
- A Increased capillary hydrostatic pressure
- B Decreased plasma oncotic pressure
- C Obstruction of lymphatic drainage
- D Increased arterial blood inflow
Correct answer: Increased arterial blood inflow
Edema arises from increased hydrostatic pressure, reduced plasma oncotic pressure, lymphatic obstruction or increased permeability; hyperemia (increased arterial flow) is not a direct cause of fluid leakage.
What is the primary hemodynamic difference between hyperemia and congestion?
- A Hyperemia is passive, congestion is active
- B Hyperemia involves venous outflow obstruction, congestion involves arteriolar dilation
- C Hyperemia is increased arteriolar inflow; congestion is impaired venous outflow
- D Both refer to hemorrhage but in different organs
Correct answer: Hyperemia is increased arteriolar inflow; congestion is impaired venous outflow
Hyperemia is an active process due to arteriolar dilation and increased inflow; congestion is passive, due to impaired venous outflow leading to blood accumulation.
Which of the following best defines hemorrhage in the context of hemodynamic disorders?
- A Accumulation of transudate within tissues
- B Passive venous congestion of a tissue
- C Escape of blood from vessels into tissues
- D A free-floating clot within the vessel lumen
Correct answer: Escape of blood from vessels into tissues
Hemorrhage is the extravasation of blood from vessels into tissues, body cavities, or the body surface — i.e., leakage beyond the vascular compartment.
Which of these features are characteristic of a fresh thrombus (as opposed to a postmortem clot) on gross or microscopic examination?
- A Uniform red colour with no attachment to the vessel wall
- B Alternating pale and dark laminations (Lines of Zahn)
- C Soft yellow gelatinous 'chicken-fat' consistency
- D Black, dry, friable material loosely adhering
Correct answer: Alternating pale and dark laminations (Lines of Zahn)
A true thrombus often shows Lines of Zahn — alternating layers of platelets/fibrin (pale) and red blood cells (dark) — indicating formation in flowing blood.
Which component of Rudolf Virchow’s triad refers to an abnormality of blood flow (e.g., stasis or turbulence)?
- A Endothelial injury
- B Hypercoagulability
- C Stasis or turbulent flow
- D Platelet dysfunction
Correct answer: Stasis or turbulent flow
Virchow’s triad describes factors predisposing to thrombosis: endothelial injury, hypercoagulability, and abnormal blood flow (stasis or turbulence). Abnormal flow dynamics is the component referring to flow disturbance.
A detached intravascular mass traveling through the bloodstream and lodging in a distant vessel is called a(n):
- A Thrombus
- B Embolus
- C Aneurysm
- D Hematoma
Correct answer: Embolus
An embolus is a free-floating intravascular mass (e.g., clot fragment, fat, air) that travels with the blood flow and can occlude downstream vessels.
Which type of embolism is most commonly derived from a deep vein thrombosis (DVT) in the lower limb?
- A Paradoxical embolism
- B Pulmonary thromboembolism
- C Arterial embolism to the brain
- D Fat embolism
Correct answer: Pulmonary thromboembolism
A venous thrombus from a lower limb DVT often dislodges, travels via the venous system to the lungs, and lodges as a pulmonary embolism — the most frequent consequence.
Which of the following best describes an infarction in pathology?
- A Accumulation of transudative fluid in tissues
- B Localized hemorrhage without tissue death
- C Ischemic necrosis from occluded arterial or venous flow
- D Generalized edema across multiple organs
Correct answer: Ischemic necrosis from occluded arterial or venous flow
An infarct is an area of ischemic necrosis resulting from occlusion of arterial supply or venous drainage, most commonly due to thrombosis or embolism.
Which factor does NOT influence whether an occluded vessel will lead to infarction or to tissue survival via collateral circulation?
- A Nature of vascular supply (single vs dual)
- B Rate of development of occlusion
- C Oxygen content of blood
- D Colour of the clot
Correct answer: Colour of the clot
Whether occlusion causes infarction depends on vascular anatomy (single vs dual supply), how quickly occlusion develops (acute vs slow), and tissue oxygen demand; the colour of the clot is irrelevant.
Which hemodynamic condition is characterized by impaired venous return and passive accumulation of deoxygenated blood in tissues?
- A Hyperemia
- B Active congestion
- C Passive congestion
- D Arterial ischemia
Correct answer: Passive congestion
Congestion is a passive process due to impaired venous outflow, leading to accumulation of deoxygenated blood in the affected tissue.
Which of the following is NOT a typical cause of increased capillary hydrostatic pressure leading to edema?
- A Congestive heart failure
- B Deep vein thrombosis
- C Cirrhosis with hypoalbuminemia
- D Pulmonary venous hypertension
Correct answer: Cirrhosis with hypoalbuminemia
Hypoalbuminemia (as seen in cirrhosis) lowers plasma oncotic pressure rather than increasing hydrostatic pressure; the others impair venous return or increase venous pressure raising capillary hydrostatic pressure.
In chronic passive congestion of the liver (e.g., right-sided heart failure), what is the classic gross appearance often described by pathologists?
- A Cirrhosis with a micronodular surface
- B Nutmeg liver with mottled centrilobular zones
- C Fatty liver with pale, enlarged hepatocytes
- D Massive hemorrhagic necrosis of the parenchyma
Correct answer: Nutmeg liver with mottled centrilobular zones
Chronic passive congestion causes centrilobular congestion and hemorrhage; on gross exam the liver shows mottled red-brown centrilobular zones against tan lobular tissue — the so-called “nutmeg liver.”
Which type of shock results from a sudden drop in effective circulating blood volume (e.g., due to hemorrhage or dehydration)?
- A Cardiogenic shock
- B Hypovolemic shock
- C Distributive (septic) shock
- D Obstructive shock
Correct answer: Hypovolemic shock
Hypovolemic shock arises from severe blood or fluid loss, leading to insufficient circulating volume and reduced tissue perfusion.
Which hemodynamic disorder can lead to hemosiderin-laden macrophages (so-called 'heart failure cells') in the lungs on histology?
- A Acute pulmonary hyperemia
- B Chronic passive pulmonary congestion
- C Acute pulmonary embolism
- D Alveolar pulmonary hemorrhage
Correct answer: Chronic passive pulmonary congestion
Chronic passive pulmonary congestion causes red cell extravasation and breakdown; alveolar macrophages ingest hemoglobin, degrading it to hemosiderin — producing 'heart-failure cells'.
What distinguishes a red (hemorrhagic) infarct from a pale (anemic) infarct?
- A Red infarct results from arterial occlusion in solid organs, pale from venous occlusion in loose tissues
- B Red: dual-supply or venous-occluded tissue; pale: solid organs after arterial occlusion
- C Red infarcts are always older than pale infarcts
- D They are identical; terminology varies by region
Correct answer: Red: dual-supply or venous-occluded tissue; pale: solid organs after arterial occlusion
Hemorrhagic (red) infarcts happen when there is venous occlusion or in tissues with dual blood supply (lung, intestine) allowing re-perfusion and hemorrhage. Pale infarcts occur in solid organs after arterial occlusion without reperfusion.
Which hemodynamic disorder is defined as inappropriate formation of a blood clot within an intact vascular system, potentially leading to vessel occlusion or embolism?
- A Hemorrhage
- B Embolism
- C Thrombosis
- D Edema
Correct answer: Thrombosis
Thrombosis is the pathological formation of a blood clot (thrombus) within a vessel without prior vessel rupture, which can impede flow or give rise to emboli.
Which factor is NOT part of Virchow’s triad for predisposition to thrombosis?
- A Endothelial injury
- B Hypercoagulability
- C Abnormal blood flow
- D Vascular permeability
Correct answer: Vascular permeability
Virchow’s triad includes endothelial injury, hypercoagulability, and abnormal (stasis or turbulent) flow; vascular permeability per se is not one of the triad components.
Which of the following does NOT typically result from hemodynamic disorders?
- A Anemia due to hemorrhage
- B Infarction due to arterial occlusion
- C Edema due to lymphatic obstruction
- D Primary neurodegenerative disease
Correct answer: Primary neurodegenerative disease
Anemia, infarction, edema, and hemorrhage can all result from hemodynamic disturbances; primary neurodegenerative disease does not stem from altered hemodynamics.