Shock Definition and Categories
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Questions and Answers

Which of the following is NOT a common cause of nonresponsive shock?

  • Overhydration (correct)
  • Hypoglycemia
  • Hypothermia
  • Electrolyte imbalances
  • What is a major risk associated with animals suffering from shock?

  • Dehydration
  • Anemia
  • Systemic inflammatory response syndrome (SIRS) (correct)
  • Cardiac arrest
  • Which monitoring parameter is most indicative of oxygen delivery and utilization?

  • Respiratory rate
  • Urine output
  • Central venous pressure
  • Lactate measurement (correct)
  • What should be monitored to ensure that treated animals do not slip back into shock?

    <p>All vital parameters and organ functions (D)</p> Signup and view all the answers

    What is a common factor that may contribute to shock beyond inadequate volume replacement?

    <p>Excessive vasodilation (C)</p> Signup and view all the answers

    Why should smaller aliquots of fluids be administered more slowly to a cat during rewarming?

    <p>To avoid volume overload once normothermic (B)</p> Signup and view all the answers

    When are antibiotics indicated in shock treatment?

    <p>Only when there is a documented infection (D)</p> Signup and view all the answers

    What is the primary goal of shock therapy?

    <p>To reach resuscitation endpoints with minimum resources (B)</p> Signup and view all the answers

    What condition would justify the use of corticosteroids in shock treatment?

    <p>Relative adrenal insufficiency in septic patients (B)</p> Signup and view all the answers

    Which of the following is NOT an endpoint of shock resuscitation?

    <p>Rapid increase in blood volume (D)</p> Signup and view all the answers

    If endpoints are not achieved with fluid therapy, what should be done next?

    <p>Investigate and treat causes of nonresponsive shock (A)</p> Signup and view all the answers

    What is a key indicator of effective circulating fluid volume during shock therapy?

    <p>Pink mucous membranes with normal CRT (A)</p> Signup and view all the answers

    What should be monitored to determine the success of shock resuscitation?

    <p>Restoration of hydration and ongoing fluid losses (D)</p> Signup and view all the answers

    What is a common cause of cardiogenic shock related to the heart's function?

    <p>Poor contractility (D)</p> Signup and view all the answers

    Which condition is associated with obstructive shock due to impaired cardiac filling?

    <p>Cardiac tamponade (C)</p> Signup and view all the answers

    What type of shock may occur due to hypoxemia?

    <p>Metabolic shock (B)</p> Signup and view all the answers

    During which stage of shock is the patient most likely able to meet their metabolic oxygen demands?

    <p>Compensatory shock (C)</p> Signup and view all the answers

    What clinical sign might indicate a patient is experiencing compensatory shock?

    <p>Increased heart rate (D)</p> Signup and view all the answers

    Which of the following factors is NOT typically associated with metabolic shock?

    <p>Hypertrophic cardiomyopathy (D)</p> Signup and view all the answers

    What underlying problem can occur when there is increased oxygen demand exceeding delivery in sepsis?

    <p>Metabolic shock (B)</p> Signup and view all the answers

    Which of the following is a potential cause of obstructive shock?

    <p>Masses impeding blood flow (C)</p> Signup and view all the answers

    Which clinical sign is commonly observed in early decompensatory shock but may present differently in different species?

    <p>Tachycardia (A), Bradycardia (B)</p> Signup and view all the answers

    What is a notable clinical sign of late decompensatory shock?

    <p>Prolonged to absent capillary refill time (B)</p> Signup and view all the answers

    In septic shock, which clinical sign is distinctly observed compared to other shocks?

    <p>Hypotension with hyperemic mucous membranes (B)</p> Signup and view all the answers

    What physiological response occurs in the body due to a decrease in pressure detected by aortic baroreceptors?

    <p>Increased systemic vascular resistance (D)</p> Signup and view all the answers

    Which of the following is a consequence of reduced oxygen delivery to non-vital organs during shock?

    <p>Anaerobic metabolism (C)</p> Signup and view all the answers

    What may result from poor perfusion of the intestinal tract during shock?

    <p>Bloody diarrhea or vomiting (D)</p> Signup and view all the answers

    What is a potential outcome when the body fails to maintain normal compensatory mechanisms in shock?

    <p>Severe hypotension (D)</p> Signup and view all the answers

    What is the primary purpose of administering crystalloids in conjunction with colloids?

    <p>To reduce the dose of crystalloids initially. (A)</p> Signup and view all the answers

    Which of the following is NOT typically associated with shock in animals?

    <p>High cardiac output (B)</p> Signup and view all the answers

    What is a requirement before administering sympathomimetics to a patient?

    <p>The patient must have adequate circulating volume. (D)</p> Signup and view all the answers

    Which of the following drugs is considered a positive inotropic agent?

    <p>Dobutamine (A)</p> Signup and view all the answers

    In cases of cardiogenic shock with myocardial failure, which type of drug may be utilized?

    <p>Sympathomimetics only. (D)</p> Signup and view all the answers

    What specific treatment is recommended for animals in shock due to anemia?

    <p>Red cell transfusions. (D)</p> Signup and view all the answers

    What is a potential effect of hypothermia in cats concerning catecholamines?

    <p>Reduced responsiveness of cholinergic receptors. (A)</p> Signup and view all the answers

    Which treatment approach is primarily aimed at correcting the underlying cause of metabolic shock?

    <p>Specific therapies for conditions like hypoglycemia or anemia. (C)</p> Signup and view all the answers

    The use of which sympathomimetic is intended to increase systemic vascular resistance?

    <p>Both B and C. (B)</p> Signup and view all the answers

    What defines shock in a clinical setting?

    <p>Inadequate cellular energy production due to insufficient oxygen or nutrient delivery (D)</p> Signup and view all the answers

    Which of the following is a category of shock?

    <p>Hypovolemic shock (D)</p> Signup and view all the answers

    What is a primary cause of hypovolemic shock?

    <p>Loss of blood volume through hemorrhage (A)</p> Signup and view all the answers

    Which type of shock is characterized by vasodilation and a state of relative hypovolemia?

    <p>Distributive shock (C)</p> Signup and view all the answers

    In cardiogenic shock, what is primarily reduced?

    <p>Forward flow of blood (C)</p> Signup and view all the answers

    What contributes to septic shock?

    <p>Infection leading to the release of inflammatory mediators (B)</p> Signup and view all the answers

    Which mechanism contributes to energy deprivation in shock?

    <p>Decreased cardiac output (C)</p> Signup and view all the answers

    Which option correctly describes the effects of vasodilation in distributive shock?

    <p>Reduced preload and afterload (D)</p> Signup and view all the answers

    Flashcards

    What is shock?

    Inadequate cellular energy production due to insufficient oxygen or nutrient delivery to meet cell needs.

    Hypovolemic Shock

    Loss of circulating blood volume. This reduces preload and decreases cardiac output.

    Distributive Shock

    Vasodilation causes blood volume to spread out, leading to a relative low blood volume in the circulatory system. Reduces afterload.

    Septic Shock

    A form of distributive shock caused by an infection. Inflammatory mediators cause vasodilation.

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    Cardiogenic Shock

    Low blood flow due to heart problems, such as heart attack.

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    Vasodilatory Shock

    A state of relative hypovolemia due to vasodilation.

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    What causes cardiogenic shock?

    Low forward flow of blood caused by heart-related issues.

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    What is hypovolemic shock?

    A state of reduced blood volume in the vascular system. This reduces preload and decreases cardiac output.

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    Obstructive Shock

    A type of shock caused by a physical obstruction impeding blood flow, affecting central circulation like the heart or great arteries/veins.

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    Metabolic Shock

    Shock caused by inadequate delivery of substrates needed for cellular energy production. This can be due to severe anemia, hypoxemia, or inability to utilize oxygen properly.

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    Compensatory Shock

    A stage of shock where the body's compensatory mechanisms are still working, maintaining adequate oxygen supply to cells and tissues.

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    Early Decompensatory Shock

    A stage of shock where compensatory mechanisms begin to fail, leading to a decline in tissue oxygenation.

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    Late Decompensatory Shock

    The most severe stage of shock where compensatory mechanisms completely fail, resulting in a significant drop in blood pressure and tissue oxygenation.

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    Pericardial Effusion

    Fluid buildup in the pericardial sac, putting pressure on the heart and hindering its ability to fill with blood.

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    Thromboembolic Disease

    An example of obstructive shock where a blood clot, mass, or vessel kink restricts blood flow.

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    Shock

    A state where the body's tissues are not receiving enough oxygen due to inadequate blood flow.

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    Shock dose

    Fluids administered to rapidly restore blood volume in shock.

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    Sympathomimetics

    Drugs that mimic the 'fight or flight' response, boosting heart function or blood pressure.

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    Inotropes

    Drugs that strengthen heart contractions, improving blood flow.

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    Pressors

    Drugs that constrict blood vessels, raising blood pressure.

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    Hypothermic shock

    Shock caused by low body temperature, especially common in cats and small animals.

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    Metabolic shock treatment

    Treatment for shock that focuses on the underlying cause, such as blood transfusions for anemia.

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    Other Signs of Shock

    A set of clinical signs observed during or after shock that stem from decreased oxygen delivery to specific tissues.

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    Gastrointestinal Signs of Shock

    Characterized by bloody diarrhea and/or vomiting, which is often attributed to poor perfusion of the intestinal tract during various forms of shock.

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    Renal Signs of Shock

    Characterized by acute renal failure, which is a result of decreased renal perfusion, often leading to decreased urine output and potentially kidney damage.

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    Fluid administration for small animals with shock

    Smaller animal patients should be given fluids slower than larger animals while they are actively being warmed back to a normal temperature.

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    Avoiding fluid overload in shock

    When treating cats with shock, aggressively hydrating them before warming them up can overwhelm their system once they reach a normal temperature, potentially leading to complications.

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    Antibiotic use in shock

    Antibiotics are important in cases of sepsis, where bacteria have entered the bloodstream, or when there is a suspicion of infection.

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    Preventing secondary sepsis with antibiotics

    When an animal's body defenses are compromised, such as after a severe gut injury, antibiotics can help prevent bacteria from entering the bloodstream and causing sepsis.

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    Steroid use in shock

    Steroid use in shock is usually not recommended except in cases of adrenal insufficiency or severe allergic reactions (anaphylaxis).

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    Goals of shock therapy

    The goal of shock treatment is to restore normal blood flow and vital signs using the smallest amount of fluids and medications possible.

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    Maintaining fluid balance after shock

    Once an animal has achieved normal vital signs and blood flow, additional fluids are needed to maintain their hydration and compensate for ongoing fluid losses.

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    Investigating non-responsive shock

    If an animal does not respond to fluid therapy, it indicates that there may be underlying issues that need to be identified and addressed.

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    Systemic Inflammatory Response Syndrome (SIRS)

    A serious condition where the body's inflammatory response goes out of control, leading to organ dysfunction and failure.

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    Multiple Organ Dysfunction Syndrome (MODS)

    A condition where several organs in the body begin to fail due to prolonged shock or other conditions.

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    Study Notes

    Shock Definition and Categories

    • Shock is inadequate cellular energy production, arising from insufficient oxygen or nutrient delivery to cells.

    • This cellular energy shortfall results in dysfunction and potential cell death at the tissue and organ level.

    • Shock categories include:

      • Hypovolemic: Low effective circulating blood volume, due to factors like hemorrhage, fluid loss from vomiting, diarrhea, polyurea, or third space fluid shifts (e.g., burns).
      • Distributive: Relative hypovolemia due to vasodilation, influenced by anaphylaxis, mast cell tumors, toxins, or neurologic issues (e.g., brain injury, spinal cord injury). Septic shock is a subtype.
      • Cardiogenic: Insufficient cardiac output (inadequate blood flow) due to heart-related issues including (but not limited to) myocardial depressant factors, poor contracility, reduced preload and decreased heart rate.
      • Obstructive: Physical obstruction impeding blood flow, affecting central circulation (e.g., pericardial effusion, thromboembolic disease, GDV, or colonic torsion).
      • Metabolic: Inadequate delivery of substrates to meet energy needs, due to factors like severe anemia, hypoxemia, increased oxygen demand (sepsis, heat stroke), or inability to use oxygen properly (cyanide poisoning).

    Shock Stages and Signs

    • Shock stages include compensatory, early decompensatory, and late decompensatory (terminal). Each stage is accompanied by unique clinical signs.
    • Compensatory shock: compensatory mechanisms like increase heart rate and vasoconstriction are maintained, with normal or slightly elevated blood pressure and pulse quality. Animals often have increased respirations.
    • Early decompensatory shock: compensatory mechanisms fail, and signs of reduced blood flow like tachycardia, pale mm, prolonged CRT and low blood pressure are apparent, but not necessarily profound.
    • Late decompensatory shock (terminal shock): vital organs, including the heart and brain, begin to show signs of damage due to lack of adequate perfusion and lack of sufficient oxygen. The affected animal is close to death.

    Shock Treatment Principles

    • Treatment focuses on restoring oxygen delivery and improving circulating volume.
    • Fluid therapy is often initial treatment, using isotonic crystalloids or colloids to quickly increase blood volume and improve cardiac output.
    • Oxygen therapy is a component of shock resuscitation and is implemented whenever possible to address hypoxia.
    • Additional treatment often includes correcting underlying causes (e.g., hemorrhage, infection, or arrhythmia) and or supportive therapies like antimicrobials, pressors, or inotropes.
    • A triage examination of the animal is crucial and should include neurological function, mentation, respirations (rate and pattern), cardiovascular function (color, CRT, pulse quality and rhythm). Urinary assessments (e.g., urine output) are important indicators of adequate blood flow.
    • Endpoints of shock resuscitation include normalization of clinical parameters in the animal (e.g., normal colour and CRT, normal blood pressure, heart rate and respirations, adequate urine production)

    Monitoring

    • Continuous monitoring is important, even after apparent stabilization . - Look for signs of adequate organ perfusion, and signs of cell/organ dysfunction (which can take some time to show).

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    Description

    Explore the critical concepts of shock, its definitions, and various categories including hypovolemic, distributive, cardiogenic, and obstructive shock. Understand how these conditions affect cellular energy production and the implications for tissue and organ health.

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