Fluid and Hemodynamic Disorders: Pathogenesis, Clinical Forms, and Outcomes

What is edema?

Edema is the accumulation of excess fluid in the interstitial spaces of tissues, leading to swelling.

What are five clinical examples of edema?

Cerebral edema, pulmonary edema, pitting edema of lower extremities, periorbital edema, hydrothorax.

What causes edema due to increased intravascular hydrostatic pressure?

Increased intravascular hydrostatic pressure can occur due to conditions like heart failure, leading to fluid leakage from capillaries into surrounding tissues.

What is active hyperemia?

Active hyperemia is the increased blood flow to a tissue due to arteriolar dilation, often seen during exercise or inflammation.

What is passive hyperemia (congestion)?

Passive hyperemia is the accumulation of blood in a tissue due to venous backpressure, often leading to cyanosis and associated with hydrostatic edema.

What is hemorrhage?

Hemorrhage is the escape of blood from the circulatory system, which can occur internally or externally.

What are five clinically important forms of hemorrhage?

Petechia, ecchymosis, hemoptysis, hematemesis, and hematuria.

What is hypercoagulability?

Hypercoagulability is a condition where there is an increased tendency for blood to clot, which can lead to thrombus formation.

What are mural thrombi?

Mural thrombi are thrombi that form on the wall of a blood vessel, often associated with local turbulence or injury.

What is the fate of thrombi?

Thrombi can undergo organization, recanalization, lysis, or embolization, leading to various clinical consequences.

What is an embolus?

An embolus is a substance that travels through the bloodstream and can cause blockage in a vessel, leading to infarction.

What is infarction?

Infarction is the tissue death due to the loss of blood supply, often caused by obstruction of blood vessels.

What is shock?

Shock is a life-threatening condition characterized by inadequate blood flow to the tissues, leading to cellular dysfunction.

What are the three mechanisms of shock?

The three mechanisms of shock are pump failure of the heart (cardiogenic shock), loss of fluid from circulation (hypovolemic shock), and loss of peripheral vascular tone (hypotensive shock).

What are the clinical stages of shock?

The clinical stages of shock include early or compensated shock, decompensated but reversible shock, and irreversible shock.

What are the symptoms of compensated shock?

Symptoms of compensated shock include tachycardia, vasoconstriction of arterioles, and reduced urine production.

What are the symptoms of decompensated reversible shock?

Symptoms include hypotension, tachypnea, shortness of breath, oliguria, and acidosis.

What are the characteristics of irreversible shock?

Irreversible shock is characterized by circulatory collapse, marked hypoperfusion of vital organs, and loss of vital functions.

What is the role of endothelial injury in thrombogenesis?

Endothelial injury can trigger thrombogenesis by exposing underlying collagen and tissue factor, promoting platelet adhesion and clot formation.

What is hydrothorax?

Hydrothorax is the accumulation of fluid in the pleural cavity, often leading to respiratory distress.

What is hydroperitoneum (ascites)?

Hydroperitoneum, or ascites, is the accumulation of fluid in the abdominal cavity, commonly associated with liver disease.

What is anasarca?

Anasarca is a severe and generalized edema that affects the entire body, often indicating systemic disease.

What is chronic passive congestion?

Chronic passive congestion is the long-term accumulation of blood in a tissue due to impaired venous outflow, often leading to tissue damage.