Acute right ventricular failure--from pathophysiology to new treatments

Area of Science:

• Cardiology
• Physiology

Background:

• The right ventricle (RV) maintains pulmonary circulation but is vulnerable to loading conditions and contractility changes.
• Factors affecting RV preload, afterload, or left ventricular function can precipitate RV ischemia and failure (RVF).

Observation:

• Progressive RVF exacerbates tricuspid regurgitation, reducing cardiac output and worsening organ congestion, potentially creating a detrimental cycle.
• Diagnosis optimally combines echocardiography and catheterization for monitoring treatment.
• Inhaled nitric oxide and prostacyclin reduce RV afterload via pulmonary vasodilation.

Findings:

• Levosimendan, a calcium sensitizer, enhances RV contractility without increasing myocardial oxygen demand, preserves relaxation, improves coronary perfusion, and decreases afterload.
• Traditional inotropes increase intracellular calcium and oxygen consumption; vasopressors like norepinephrine raise blood pressure, improving perfusion but increasing afterload.
• Mechanical ventilation and volume loading can be detrimental in RVF cases.

Implications:

• Understanding RVF pathophysiology, diagnosis, and treatment is vital for clinical management.
• Novel therapeutic strategies like levosimendan offer promising alternatives to traditional treatments.
• Accurate diagnosis and monitoring are essential for effective RVF management and improved patient outcomes.