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Related Concept Videos

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Pulmonary embolism (PE) occurs when a thrombus, fat or air embolus, amniotic fluid, or tumor tissue blocks one or more pulmonary arteries. These blockages originate in the venous system or the right side of the heart.EtiologyPE primarily arises from deep vein thrombosis (DVT) and other hypercoagulable states, such as inherited thrombophilias. Additional etiological factors include venous stasis, commonly seen in obesity, and endothelial injury from surgery and trauma. Less common causes include...
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Pulmonary Embolism I: Introduction01:19

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A blood clot, or thrombus, is a semi-solid mass composed of fibrin, platelets, and red blood cells. When it forms within a vessel, it can obstruct blood flow, known as thrombosis. If part of the clot detaches, it becomes an embolus that can travel and block distant vessels. When this occurs in the pulmonary arteries, it causes a condition known as pulmonary embolism (PE).Origin and ImpactMost often, the embolus originates from a thrombus in the deep veins of the lower limbs, a condition called...
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Cerebral Edema ll: Pathophysiology01:22

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Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this...
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Cerebral Edema l: Introduction01:19

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Cerebral edema is a pathological increase in brain water content that disrupts intracranial pressure regulation and impairs neurological function. Because the cranial vault is rigid, even modest increases in tissue volume can compromise cerebral perfusion, distort neural structures, and initiate secondary injury. Cerebral edema develops through four principal mechanisms: vasogenic, cytotoxic, interstitial, and ionic.Vasogenic EdemaVasogenic edema arises from disruption of the blood–brain...
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Pulmonary Edema II: Pathophysiology01:18

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Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
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Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
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Amniotic fluid embolism.

Steven L Clark1

  • 1Hospital Corporation of America, Women's and Children's Clinical Services, Nashville, Tennessee.

Obstetrics and Gynecology
|January 10, 2014
PubMed
Summary
This summary is machine-generated.

Amniotic fluid embolism is a rare but severe obstetric emergency. Early diagnosis and supportive care, including prompt delivery during maternal cardiopulmonary arrest, are crucial for improving outcomes.

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Area of Science:

  • Obstetrics
  • Maternal Medicine
  • Critical Care

Background:

  • Amniotic fluid embolism (AFE) is a rare, catastrophic obstetric emergency with high maternal mortality (20-60%).
  • Pathophysiology involves maternal inflammatory response to fetal tissue exposure during parturition, mimicking systemic inflammatory response syndrome.
  • Understanding AFE is hindered by lack of diagnostic criteria, symptom overlap with other critical maternal illnesses, and variable disease severity.

Observation:

  • Clinical studies often overestimate AFE incidence and underestimate mortality due to inadequate diagnostic review.
  • Inconsistent and contradictory data exist regarding risk factors for AFE.
  • No definitive risk factors have been identified to alter standard obstetric care.

Findings:

  • The pathophysiology of amniotic fluid embolism involves an abnormal maternal inflammatory response.
  • Diagnostic challenges include similar symptoms to other critical maternal conditions and a wide spectrum of disease severity.
  • Accurate incidence and mortality data are difficult to obtain without expert chart review.

Implications:

  • Accurate diagnosis and understanding of AFE pathophysiology are critical for improving patient outcomes.
  • Further research is needed to establish reliable diagnostic criteria and identify predictive risk factors.
  • Prompt maternal cardiopulmonary support and delivery are vital for neonatal survival in AFE cases.