PDF Notes: CHAPTER 13

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    What is hypovolemia?

    A condition with reduced extracellular fluid volume.

    What causes absolute hypovolemia?

    Massive blood loss or fluid loss from skin, GI, or kidneys.

    How does relative hypovolemia differ from absolute hypovolemia?

    No sodium deficit but increased capacitance of the ECF compartment.

    What is effective arterial blood volume (EABV)?

    The part of ECF in the arterial blood system that perfuses tissues.

    What happens to sodium balance in heart failure?

    Renal sodium retention occurs despite reduced EABV.

    What are common symptoms of hypovolemia?

    Weakness, muscle cramps, and postural light-headedness.

    What is hypervolemia?

    An expanded extracellular fluid volume relative to its capacitance.

    What can cause hypervolemia?

    Primary renal sodium retention or secondary to other organ diseases.

    How does sodium retention occur in heart failure?

    Due to blunted baroreceptor reflexes and sympathetic activation.

    What is the role of the kidneys in sodium balance?

    They integrate local, systemic, hormonal, and neural factors.

    What is the consequence of sodium loading?

    Expansion of effective arterial blood volume.

    What is the relationship between sodium and water balance?

    Sodium balance affects extracellular fluid volume and blood pressure.

    What are the clinical signs of severe hypovolemia?

    Tachycardia, hypotension, and potential circulatory collapse.

    What is the treatment goal for hypovolemia?

    Restore normal hemodynamic status and tissue perfusion.

    What is the effect of diuretics on sodium balance?

    They can induce hypovolemia if used excessively.

    What is the significance of effective arterial blood volume?

    It correlates with actual extracellular fluid volume.

    What happens in relative hypovolemia during sepsis?

    Peripheral vasodilation leads to reduced effective arterial blood volume.

    What is the impact of sodium on circulatory integrity?

    Sodium content in ECF is crucial for maintaining blood pressure.

    What laboratory findings indicate hypovolemia?

    Increased hemoglobin and plasma albumin due to hemodilution.

    What is the role of the renin-angiotensin-aldosterone system in sodium retention?

    It stimulates renal sodium and water retention in response to low EABV.