Pediatricsadvanced
Arrange the expected physiological sequence of events in progressing cardiac tamponade from earliest to latest.
Answer
Pericardial fluid accumulates beyond the pericardial reserve volume, causing a steep rise in intrapericardial pressure, Elevated intrapericardial pressure exceeds intracardiac pressure, restricting ventricular diastolic filling, Ventricular preload falls, resulting in decreased stroke volume and compensatory elevation of systemic venous pressures, Severe decline in cardiac output leads to critical systemic hypoperfusion and obstructive shock
Explanation
The sequence begins when pericardial pressure rises steeply after a critical amount of fluid has accumulated. External pressure then restricts ventricular filling during diastole. Blood backs up into the systemic and pulmonary venous systems, while forward cardiac output falls. Without treatment, inadequate output can progress to shock. This sequence explains why tamponade is an emergency even though the early presentation may initially seem nonspecific. **Key takeaway:** Pressure-related restriction of filling leads to venous congestion, low output, and possible shock. **Glossary:** **Venous pressure**: pressure in the veins returning blood to the heart. **Diastole**: the cardiac relaxation and filling phase.
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