Pediatricsadvanced
Explain the progression from pericardial fluid accumulation to shock in untreated tamponade.
Answer
As fluid accumulates, pericardial pressure initially rises gradually. Once a critical level is reached, pressure rises rapidly and compresses the heart. Ventricular filling during diastole is inhibited, systemic and pulmonary venous pressures increase, and cardiac output falls. If untreated, reduced output can progress to shock.
Explanation
Small increments of fluid may initially produce only a gradual rise in pericardial pressure. Once the pericardial reserve is exceeded, pressure can increase sharply and compress the heart. This impairs ventricular filling during **diastole**, raises systemic and pulmonary venous pressures, and reduces the amount of blood the heart can pump forward. Falling cardiac output can then progress to shock, making untreated tamponade a potentially rapidly fatal condition. **Key takeaway:** Tamponade causes a chain from restricted filling to reduced output and, if untreated, shock. **Glossary:** **Ventricular filling**: entry of blood into the ventricles. **Cardiac output**: the volume of blood pumped by the heart over time. **Shock**: inadequate circulation to meet tissue needs.
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