Blood Cholesterol and Triglycerides Associate with Right Ventricular Function in Pulmonary Hypertension

Area of Science:

• Cardiology
• Pulmonary Medicine
• Metabolic Disorders

Background:

• Pulmonary hypertension (PH) is associated with dyslipidemia, impacting disease severity and mortality.
• Lower high-density lipoproteins cholesterol (HDL-C) and low-density lipoproteins cholesterol (LDL-C) are markers of poor prognosis in PH.
• Right ventricle (RV) dysfunction is a primary driver of morbidity and mortality in PH.

Approach:

• The study compared lipid profiles and RV function in 30 PH patients and 12 healthy controls.
• Evaluations included echocardiography, 2-[18F] fluoro-2-deoxy-D-glucose positron emission tomography (PET) scans, and blood lipid measurements.
• Key markers assessed were total cholesterol (TC), triglycerides (TG), HDL-C, LDL-C, and N-terminal pro-B type Natriuretic Peptide (NT-proBNP).

Key Points:

• PH patients exhibited lower HDL-C and a higher TG to HDL-C ratio compared to controls.
• Lower TC and TG levels correlated with impaired RV function, including reduced RV strain and fractional area change.
• Reduced RV glucose uptake, measured by PET, was also associated with lower TC and TG.

Conclusions:

• Dyslipidemia, specifically altered HDL-C and TG levels, is significantly associated with worse RV function in pulmonary hypertension.
• These findings highlight the role of lipid metabolism in the pathophysiology of RV dysfunction in PH.
• The study confirms the link between lipid dysregulation and cardiac impairment in PH patients.