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The circulatory system plays a crucial role in ensuring the optimal functioning of the human body. One of its critical components is venous return - the process that completes the blood circulation cycle. This article will delve into the concept of venous return, how it works, and its significance to our health.
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Venous thrombosis, the most common disorder of the veins, involves the formation of a thrombus or blood clot associated with vein inflammation. It can be classified as either superficial vein thrombosis or deep vein thrombosis.Superficial Vein Thrombosis: This involves the formation of a thrombus in a superficial vein, usually the greater or lesser saphenous vein. Though less severe than deep vein thrombosis (DVT), SVT can lead to complications if untreated.Deep Vein Thrombosis (DVT): This...
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Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
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Nursing management begins with a thorough assessment of the patient's health history. Key factors include trauma to veins, peripherally inserted central catheters, varicose veins, recent pregnancy or childbirth, surgery, bacteremia, prolonged bed rest, atrial fibrillation, COPD, heart failure, cancer, coagulation disorders, myocardial infarction, spinal cord injury, stroke, prolonged travel, recent bone fractures, and dehydration. Review medication intake, particularly oral contraceptives,...
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Laser Doppler: A Tool for Measuring Pancreatic Islet Microvascular Vasomotion In Vivo
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Venous Vasomotion.

Dirk F van Helden1, Mohammad S Imtiaz2

  • 1Faculty of Health and Medicine, School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, Australia. dirk.vanhelden@newcastle.edu.au.

Advances in Experimental Medicine and Biology
|June 12, 2019
PubMed
Summary
This summary is machine-generated.

Veins show spontaneous rhythmic contractions called vasomotion, driven by calcium cycles within mural cells. Understanding this mechanism could improve venous drainage and fluid absorption.

Keywords:
Ca2+ storesCardiac muscleCellular rhythmsCoupled oscillator-based entrainmentInositol 1,4,5-trisphosphate receptorsPericytesRyanodine receptorsSmooth muscleVasomotionVeins

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Area of Science:

  • Physiology
  • Vascular Biology
  • Cellular Mechanics

Background:

  • Veins exhibit spontaneous contractile activity known as vasomotion.
  • This activity is mediated by the synchronized contractions of mural cells, such as smooth muscle cells (SMCs) and pericytes.
  • Vasomotion involves interconnected intracellular oscillators that entrain their cycles.

Purpose of the Study:

  • To elucidate the underlying mechanisms of vasomotion in veins.
  • To explore the role of calcium ion (Ca2+) dynamics in regulating venous contractile activity.
  • To identify potential therapeutic targets for improving venous function.

Main Methods:

  • Pharmacological studies to investigate calcium release-refill cycles.
  • Analysis of inositol 1,4,5-trisphosphate receptor (IP3R) and ryanodine receptor (RyR) function.
  • Investigation of calcium-activated chloride channels and their role in depolarization.
  • Examination of intercellular communication via gap junctions and endothelial connections.

Main Results:

  • Vasomotion is driven by rhythmical Ca2+ release-refill cycles within SR/ER stores, involving IP3R and RyR.
  • Released Ca2+ activates chloride channels, leading to depolarization and subsequent Ca2+ influx.
  • Intercellular entrainment through gap junctions synchronizes mural cell activity, resulting in coordinated contractions.
  • This process often leads to vessel constriction, contributing to venous tone.

Conclusions:

  • The study details the cellular and molecular mechanisms of venous vasomotion, emphasizing the critical role of calcium signaling.
  • Understanding these oscillatory mechanisms is crucial for comprehending venous function.
  • Further research into vasomotion could lead to strategies for enhancing venous drainage and fluid exchange.