Which of the following mechanisms are not associated with development of cor pulmonale?
  1. Pulmonary vasoconstriction
  2. Pulmonary plethora
  3. Primary pulmonary hypertension
  4. Increased blood viscosity
Explanation
Answer: B -Cor pulmonale is not caused by pulmonary plethora; it is caused by pulmonary vasoconstriction, anatomic changes in vascularization, increased blood viscosity, and idiopathic or primary pulmonary hypertension.
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