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Related Concept Videos

Blood Transfusion01:15

Blood Transfusion

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Blood transfusion is a critical medical procedure that saves lives and treats various medical conditions. It involves transferring blood from a donor to a recipient. This process requires a thorough understanding of the ABO blood group system and its associated antigens and antibodies.
Blood Transfusion Overview
A blood transfusion is a medical procedure used to replace blood lost due to injury, surgery, or to treat conditions such as anemia or cancer. During a transfusion, donor blood is...
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Blood Transfusion and Agglutination02:45

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Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...
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Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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Restriction Enzymes01:11

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Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
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Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

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Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
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Persuasion Strategies01:52

Persuasion Strategies

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Researchers have tested many persuasion strategies, including the foot-in-the door and the door-in-the-face techniques, in a variety of contexts. Ultimately, the principles are effective in selling products and changing people’s attitude, ideas, and behaviors (Cialdini & Goldstein, 2004).
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Related Experiment Video

Updated: Jan 24, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
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Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage

Published on: August 30, 2020

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Liberal Versus Restrictive Transfusion Strategy in Patients With Subarachnoid Hemorrhage: A Meta-Analysis.

Pargol Balali1, Lamya Ibrahim1, Monisha A Kumar1

  • 1Department of Neurology University of Pennsylvania Philadelphia PA.

Stroke (Hoboken, N.J.)
|January 23, 2026
PubMed
Summary

Liberal packed red blood cell transfusion strategies showed a trend toward better neurologic outcomes in subarachnoid hemorrhage patients. Further research is needed to confirm optimal transfusion strategies for this population.

Keywords:
anemiabloodsubarachnoid hemorrhagetransfusion

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A Murine Model of Subarachnoid Hemorrhage
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Last Updated: Jan 24, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
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A Murine Model of Subarachnoid Hemorrhage
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A Volumetric Method for Quantification of Cerebral Vasospasm in a Murine Model of Subarachnoid Hemorrhage
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Area of Science:

  • Neurology
  • Critical Care Medicine
  • Hematology

Background:

  • The optimal threshold for packed red blood cell (PRBC) transfusion in anemic patients with subarachnoid hemorrhage (SAH) remains unclear.
  • Different transfusion strategies may impact neurologic outcomes in this vulnerable patient group.

Purpose of the Study:

  • To evaluate the effect of liberal versus restrictive PRBC transfusion strategies on functional neurologic outcomes in adult patients with aneurysmal SAH.
  • To synthesize evidence from randomized controlled trials (RCTs) comparing high versus low hemoglobin thresholds for PRBC transfusion.

Main Methods:

  • Systematic literature search of MEDLINE (inception-March 26, 2025) for RCTs.
  • Inclusion of trials comparing functional neurologic outcomes in adult patients with aneurysmal SAH undergoing PRBC transfusion with high vs. low hemoglobin thresholds.
  • Risk of bias assessment using Cochrane Risk of Bias tool 2.0 and pooled risk ratio (RR) calculation using random-effect models.

Main Results:

  • Three RCTs (n=953 patients) met the inclusion criteria.
  • Liberal transfusion strategies (hemoglobin 9-11.5 g/dL) showed a trend towards reduced unfavorable neurologic outcomes (RR, 0.88; 95% CI, 0.77-1.01; P=0.06) compared to restrictive strategies (hemoglobin 7-10 g/dL).
  • An exploratory analysis defining unfavorable outcomes as Glasgow Outcome Scale Extended score ≤5 or modified Rankin Scale score ≥3 also showed a significant reduction with liberal strategies (RR=0.89; 95% CI, 0.79-0.99; P=0.04).

Conclusions:

  • A trend towards improved neurologic outcomes was observed with liberal PRBC transfusion strategies in SAH patients.
  • Further research is necessary to establish the optimal transfusion strategy and identify patient subgroups benefiting most from liberal approaches.