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Hyperosmolar Hyperglycemic State01:21

Hyperosmolar Hyperglycemic State

Hyperosmolar Hyperglycemic State, or HHS, is a serious and life-threatening complication of type 2 diabetes mellitus. It is characterized by three main features: severe hyperglycemia, profound dehydration, and elevated serum osmolality, all occurring without significant ketoacidosis.HHS typically develops in older adults or individuals with limited access to fluids. This may result from illness, cognitive impairment, or medications such as diuretics or corticosteroids. These factors reduce...
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Disorder of Water Balance01:29

Disorder of Water Balance

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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Related Experiment Video

Updated: Jun 16, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Hydration does not prevent orthostatic hypercoagulability.

M Masoud1, G Sarig, B Brenner

  • 1Medicine F & J. Recanati Autonomic Dysfunction Center, Tel-Aviv Medical Center, Tel Aviv, 64239, Israel.

Thrombosis and Haemostasis
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Intravenous rehydration did not prevent or reduce orthostatic hypercoagulability in healthy subjects. Standing increased thrombin formation, and fluid administration only diluted coagulation parameters without altering this effect.

Related Experiment Videos

Last Updated: Jun 16, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Area of Science:

  • Physiology
  • Hematology
  • Vascular Biology

Background:

  • Prolonged standing can activate the coagulation cascade, leading to orthostatic hypercoagulability.
  • Endothelial cell activation and hemoconcentration are implicated in this phenomenon.

Purpose of the Study:

  • To investigate whether intravenous rehydration (hemodilution) can prevent or attenuate orthostatic-induced thrombin formation.
  • To assess the impact of fluid administration on coagulation parameters during prolonged standing.

Main Methods:

  • Twelve healthy subjects underwent two study visits.
  • Measurements included hematocrit, total plasma protein, coagulation profile, endothelial activation markers, and protein C pathway.
  • Data were collected at rest (supine) and after 15 and 30 minutes of standing, with and without prior intravenous saline infusion.

Main Results:

  • Intravenous rehydration caused hemodilution of coagulation parameters but did not prevent increased tissue factor and von Willebrand factor during standing.
  • Factor V, Factor VIII, and fibrinogen levels increased significantly after 30 minutes of standing, similar to non-rehydrated conditions.
  • Prothrombin fragments 1+2 also elevated significantly, and protein C levels decreased, irrespective of rehydration status.

Conclusions:

  • Intravenous prophylactic rehydration with normal saline leads to hemodilution of coagulation parameters.
  • Rehydration does not attenuate or prevent orthostatic hypercoagulability in healthy individuals.
  • Standing induces thrombin formation and alters coagulation markers independently of fluid administration.