Sepsis-induced hypocholesterolemia is linked to low cardiomyocyte membrane cholesterol and impaired catecholamine responsiveness.

Summary

In septic patients and a parallel rat model, HDL-cholesterol fell early and predicted worse outcomes, while cardiomyocyte membrane cholesterol decreased with blunted dobutamine responsiveness. Cholesterol infusion (HDL or liposomal) restored membrane cholesterol, adrenergic signaling, and inotrope responsiveness, revealing a mechanistic link between hypocholesterolemia and catecholamine hyporesponsiveness.

Key Findings

• Early decreases in HDL-cholesterol in septic patients and rats predicted worse outcomes.
• Cardiomyocyte membrane cholesterol decreased with blunted dobutamine inotropic response, consistent with sepsis-induced cardiomyopathy.
• Cholesterol infusion (HDL or liposomal) restored membrane cholesterol, adrenergic signaling, and dobutamine responsiveness.

Clinical Implications

Consider monitoring lipoproteins (especially HDL-C) as part of sepsis cardiomyopathy risk stratification and explore cholesterol repletion strategies to restore vasopressor/inotrope responsiveness, pending clinical trials.

Limitations

• Human sample size was modest and non-randomized; interventional effects were shown in animals, not yet in clinical trials.
• Generalizability and safety of cholesterol infusion require prospective human validation.

Future Directions

Conduct randomized clinical trials testing cholesterol repletion strategies in septic shock with catecholamine hyporesponsiveness, and evaluate lipid phenotype-guided therapy.