Questions and Answers
What is a characteristic of left-to-right shunts?
PVR is lower than SVR
What is a consequence of a large left-to-right shunt and low PVR?
Substantial increase in PBF
What is a result of excessive PBF in patients with left-to-right shunts?
Progressive elevation in PVR
What is a complication of volume overload in patients with left-to-right shunts?
Signup and view all the answers
What is a result of diastolic changes in patients with left-to-right shunts?
Signup and view all the answers
Why may large left-to-right shunts outstrip the capacity of the left side of the heart to maintain adequate systemic perfusion in infants?
Signup and view all the answers
Study Notes
Left-to-Right Shunts
- Occur when PVR is lower than SVR, directing blood flow preferentially towards the lungs
- Result in increased PBF (pulmonary blood flow)
Pathophysiologic Problems
- Congestion of the pulmonary circulation
- Intravascular volume overload with increased cardiac work for the LV
- Excessive PBF, resulting in progressive elevation in PVR
Volume Overload Consequences
- Ventricular dilation, placing the heart at a mechanical and physiologic disadvantage
- Reduced diastolic compliance
- Engorgement of respective venous beds, producing signs and symptoms of clinical CHF (congestive heart failure)
Infant's Limited Capacity
- Imature left heart structure limits its capacity to maintain adequate systemic perfusion in the face of large left-to-right shunts
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Learn about the effects of left-to-right shunts on the circulatory system, including increased pulmonary blood flow, congestion, and volume overload consequences.
