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Progressive Shock. Low Cardiac Output decreases arterial pressure and reduces transport of nutrients to tissues Blood pH then decreases because of lactic & carbonic acid buildup.

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progressive shock
Progressive Shock
  • Low Cardiac Output decreases arterial pressure and reduces transport of nutrients to tissues
  • Blood pH then decreases because of lactic & carbonic acid buildup.
  • Waste products lead to blood agglutination. Smaller vessels may become blocked, further decreasing nutrient transport
hypovolemia
HYPOVOLEMIA
  • “Hemorrhagic Shock”
  • Diminished blood volume and cardiac output as a result of hemorrhage
  • Commonly associated with major trauma and obstetrical situations
  • Affects the central nervous, cardiac, and renal systems
dehydration and shock form or cause
Dehydration and Shock – Form or Cause?

Some texts refer to Dehydration as “a form of shock”, however the terms are not synonymous.

Dehydration is the result of total body water loss

Hypovolemic shock results from loss of blood volume and MAY result from dehydration as well as other alternate or contributing factors.

Forms of Shock:

  • Hypovolemic (inadequate blood volume)
  • Neurogenic (nervous system damage)
  • Anaphylactic (allergic reaction)
  • Septic (infections/bacterial spread)
  • Cardiogenic (heart problems)
slide6
Dehydration is the result of losing water from the body faster than it can be moved from other locations within the body (interstitial spaces) or replaced through intake and absorption. Therefore, the rate of fluid loss is as important as the amount of fluid loss.

Fluid Loss is primarily from Vascular spaces:

Sweat glands move fluid from the blood to the skin

Kidneys move fluid from the blood to the urine (highest contributor to fluid loss)

Fluid may also be lost through breathing as well as vomiting or diarrhea (lost fluid originally from blood within gut walls).

This fluid loss may CAUSE hypovolemic shock.

  • Rapid and high fluid loss will cause shock (e.g. hemorrhage)
  • Rapid and moderate fluid loss may lead to symptoms (e.g. fainting after whole blood donation, only 0.5-l); however may eventually be compensated for
  • Slow and high fluid loss will gradually increase symptoms until shock eventually occurs (see Chart).
  • Slow and moderate fluid loss may be compensated for by body without symptoms
fluid loss and shock
Fluid Loss and Shock

FLUID AND ELECTROLYTE THERAPY(http://www.cvmbs.colostate.edu/clinsci/wing/fluids/fluids.htm)

Wayne E. Wingfield, MS, DVM