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Related Concept Videos

Veins of the Abdomen and Pelvis01:18

Veins of the Abdomen and Pelvis

The human body is a complex system of interconnected parts, and the circulatory system plays a crucial role in maintaining overall health. One key component of this system is the inferior vena cava, a large vein responsible for returning blood from the abdominopelvic viscera and abdominal walls to the heart.
The inferior vena cava is fed by numerous smaller veins. The lumbar veins, for instance, drain the posterior abdominal wall, emptying both directly into the inferior vena cava and into the...
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The human circulatory system consists of blood, blood vessels that carry blood away from the heart, around the body, and back to the heart, and the heart itself, which acts as a central pump. The systemic circuit supplies blood to the whole body, the coronary circuit supplies blood to the heart, and the pulmonary circuit supplies blood flow between the heart and lungs.
Fetal Circulation01:14

Fetal Circulation

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Abdominal Aorta01:25

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Updated: Jun 23, 2026

The Intra-Aortic Balloon Pump
06:13

The Intra-Aortic Balloon Pump

Published on: February 5, 2021

The abdominal circulatory pump.

Andrea Aliverti1, Dario Bovio, Irene Fullin

  • 1Dipartimento di Bioingegneria, Politecnico di Milano, Milan, Italy. andrea.aliverti@polimi.it

Plos One
|May 15, 2009
PubMed
Summary
This summary is machine-generated.

Blood shifts between the trunk and extremities during breathing and abdominal pressure changes. This splanchnic blood flow is crucial for exercise and could aid circulation during cardiac arrest.

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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats
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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats

Published on: August 1, 2018

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Last Updated: Jun 23, 2026

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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats
09:37

Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats

Published on: August 1, 2018

Area of Science:

  • Cardiovascular Physiology
  • Respiratory Physiology

Background:

  • The splanchnic vasculature serves as a significant blood reservoir.
  • Blood volume redistribution between the trunk and extremities influences overall circulation.

Purpose of the Study:

  • To quantify blood volume shifts between the trunk and extremities.
  • To investigate the impact of breathing and abdominal muscle contractions on splanchnic blood flow.
  • To explore the potential of abdominal compression as an auxiliary cardiac pump.

Main Methods:

  • Utilized optoelectronic plethysmography to measure trunk volume changes.
  • Employed whole-body plethysmography to assess total body volume changes.
  • Simultaneously measured trunk and body volumes during diaphragm and abdominal muscle contractions.

Main Results:

  • Tidal breathing resulted in a blood volume shift (Vbs) of 50-75 ml, with an ejection fraction of 4-6% and output of 750-1500 ml/min.
  • Abdominal pressure increases caused rapid splanchnic emptying (up to 650 ml) with time constants of ~0.6 sec.
  • Splanchnic emptying can abolish pressure gradients, leading to blood pooling in the legs.

Conclusions:

  • Blood volume shifts (Vbs) are significant during breathing and abdominal pressure changes.
  • Increased Vbs enhances locomotor muscle perfusion during exercise.
  • Timed abdominal compression could generate substantial blood flow, potentially acting as an auxiliary heart during asystolic cardiac arrest.