Physiologic changes in awake goats after experimentally induced pericardial effusion

Area of Science:

• Cardiovascular Physiology
• Animal Models in Research
• Pericardial Diseases

Background:

• Acute pericardial effusion can significantly impact cardiac function.
• Understanding the hemodynamic consequences is crucial for clinical management.
• Animal models provide a controlled environment to study these effects.

Purpose of the Study:

• To investigate the physiological effects of experimentally induced acute pericardial effusion.
• To quantify changes in cardiac index, heart rate, and vascular resistance.
• To analyze alterations in systemic and pulmonary arterial pressures and right atrial pressure.

Main Methods:

• Utilized awake, unmedicated goats as an animal model.
• Experimentally induced acute pericardial effusion.
• Monitored key hemodynamic parameters including cardiac index, heart rate, stroke index, peripheral vascular resistance, aortic pressure, pulmonary arterial pressure, and right atrial pressure.

Main Results:

• A significant linear decrease in cardiac index (P < 0.01) correlated with increased pericardial volumes.
• The decline in cardiac index was primarily attributed to a reduced stroke index (P < 0.01).
• Peripheral vascular resistance increased in both systemic and pulmonary arteries; right atrial pressure significantly elevated (P < 0.01).

Conclusions:

• Experimentally induced acute pericardial effusion leads to significant cardiovascular compromise in goats.
• Reduced stroke volume is the primary driver of decreased cardiac output.
• Elevated right atrial pressure and altered vascular resistance highlight the complex hemodynamic response.