Immunoglobulins and left ventricular structure and function in pediatric HIV infection

Area of Science:

• Pediatric Cardiology
• Infectious Diseases
• Immunology

Background:

• Progressive left ventricular (LV) dilation is common in pediatric HIV-1 infection, potentially leading to congestive heart failure (CHF).
• LV dysfunction in these children is often linked to inadequate hypertrophy, elevated afterload, and reduced function.
• Previous observations suggest CHF may improve with intravenous immunoglobulin (IVIG) in other conditions.

Purpose of the Study:

• To investigate the relationship between immunoglobulin levels and LV structure/function in HIV-infected children without CHF.
• To explore the potential immunological basis of LV dysfunction in pediatric HIV.

Main Methods:

• Retrospective analysis of 49 HIV-infected infants and children without CHF.
• 106 echocardiograms performed within 30 days of serum immunoglobulin (IgG, IgA, IgM) measurements.
• Repeated-measures regression analysis adjusted for age, body surface area, and other clinical factors.

Main Results:

• Higher endogenous IgG levels and IVIG treatment correlated with increased LV wall thickness and decreased peak wall stress.
• Elevated endogenous IgA levels were associated with more normalized LV wall thickness and thickness-to-dimension ratios.
• A trend toward improved LV contractility, fractional shortening, and end-systolic wall stress was observed with higher immunoglobulin levels or IVIG therapy.

Conclusions:

• LV structure and function are more normalized in HIV-infected children receiving IVIG or with higher endogenous IgG levels.
• These findings support the hypothesis that impaired myocardial growth and LV dysfunction in pediatric HIV are immunologically mediated.
• Immunomodulatory therapy, such as IVIG, may be beneficial for managing LV dysfunction in this population.