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Reduced blood flow to the small intestine causes villous damage and cardiovascular issues. This study identified cardiotoxic substances in intestinal blood, linked to damage and affecting heart function.
Area of Science:
- Gastroenterology
- Cardiology
- Toxicology
Background:
- Reduced perfusion pressure to the small intestine leads to villous damage and cardiovascular derangement.
- Previous hypotheses suggested blood/fluid pooling in the intestine caused these effects.
Purpose of the Study:
- To investigate the cause of cardiovascular derangement following intestinal ischemia.
- To identify and characterize cardiotoxic substances in intestinal venous blood.
Main Methods:
- Experiments on cats subjected to reduced intestinal perfusion pressure.
- In vivo and in vitro studies using working rat hearts and isolated rabbit papillary muscles.
- Analysis of intestinal venous blood for cardiotoxic material.
Main Results:
- Cardiovascular derangement was not due to intestinal blood/fluid pooling.
- Cardiotoxic material was detected in cat intestinal venous blood.
- A correlation exists between villous damage severity and cardiotoxic material presence.
- The cardiotoxic material comprises heat-stable, water-soluble (500-1000 Da) and lipid-soluble fractions.
Conclusions:
- Cardiotoxic substances released from the damaged small intestine contribute to cardiovascular derangement.
- These toxins, with distinct solubility and molecular properties, play a role in post-ischemic cardiovascular dysfunction.
Abstract:
Perfusion pressure reduction to the small intestinal vascular bed for 2 hours to followed by characteristic villous damage and a general cardiovascular derangement. In an extensive series of experiments on cats it was demonstrated that the cardiovascular derangement could not be ascribed to any pooling of blood and/or fluid in the small intestine. Cardiotoxic material has been demonstrated in the cat intestinal venous blood in in vivo and in vitro experiments using working rat hearts and isolated rabbit papillary muscles. A relationship between the extent of the villous damage and the appearance of cardiotoxic material in the intestinal venous blood has been found. The cardiotoxic material seems to consist of at least two heat stable fractions. One is water soluble with a molecular mass between 500 and 1,000 daltons and the other is lipid soluble with an unknown molecular mass.