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Polymorphonuclear leukocyte functions in children with cyanotic and acyanotic congenital heart disease
S Parikh1, B Bharucha, S Kamdar
1Department of Pediatrics, Seth G.S. Medical College, Parel, Bombay.
Insights
Immune functions like bactericidal and phagocytic activity are significantly impaired in children with congenital heart disease (CHD). Hypoxia in cyanotic CHD may contribute to infections, but the immune changes in acyanotic CHD remain unclear.
Area of Science:
- Pediatric Cardiology
- Immunology
- Congenital Heart Disease Research
Background:
- Congenital heart disease (CHD) encompasses a spectrum of conditions affecting heart structure at birth.
- Patients with CHD, particularly cyanotic forms, may exhibit altered immune responses.
- Understanding immune dysfunction is crucial for managing infection risk in pediatric CHD patients.
Purpose of the Study:
- To investigate and compare immune functions (bactericidal, chemotactic, phagocytic) in children with cyanotic CHD (CCHD) and acyanotic CHD (ACHD) versus healthy controls.
- To explore the correlation between blood oxygen levels (hypoxia) and immune parameters in CCHD and ACHD patients.
- To assess the influence of hematocrit and iron deficiency anemia on immune function in these pediatric populations.
Main Methods:
- Comparative study involving 18 CCHD patients, 17 ACHD patients, and age/nutrition-matched controls (ages 2 months to 10 years).
- Assessment of bactericidal, chemotactic, and phagocytic immune functions.
- Univariate linear regression analysis to correlate immune parameters with arterial oxygen content and hematocrit.
Main Results:
- Both CCHD and ACHD groups showed significantly depressed bactericidal and phagocytic functions compared to controls (p < 0.001).
- Chemotactic function was not significantly affected in either CCHD or ACHD groups.
- A borderline significant correlation (p = 0.07) was observed between arterial oxygen content and bactericidal activity in CCHD patients; no other significant correlations were found with oxygen or hematocrit in either group.
- Iron deficiency anemia did not appear to impact immune parameters in CCHD or ACHD patients.
Conclusions:
- Hypoxia in CCHD patients may be a significant factor in the development of bacteremia and cerebral abscesses due to altered immune function.
- The observed immune function impairment in acyanotic CHD patients cannot be adequately explained by the current study's parameters.
- Further research is needed to elucidate the mechanisms behind immune dysfunction in ACHD and its clinical implications.
Abstract:
Eighteen cyanotic congenital heart disease (CCHD) and 17 acyanotic congenital heart disease (ACHD) patients in the age range of 2 months to 10 years along with their age and nutrition matched controls were studied for bactericidal, chemotactic and phagocytic functions. Bactericidal and phagocytic functions were significantly depressed in CCHD (p < 0.001) as well as ACHD group (p < 0.001) compared with controls. Chemotactic function was not significantly affected in either. Arterial oxygen content (as a measure of hypoxia) was calculated for each patient and correlated with each immune parameter by univariate linear regression analysis. In CCHD patients linear correlation of borderline significance (p = 0.07) was found between arterial oxygen content and bactericidal activity, but no correlation could be established with phagocytic and chemotactic functions. No correlation was obtained between hematocrit and any of the immune parameters. In ACHD patients no correlations were obtained between the immune parameters and arterial oxygen content or hematocrit. Iron deficiency anemia, known to affect bactericidal function, did not seem to affect the immune parameters in CCHD and ACHD groups. Altered oxygen content of the blood owing to hypoxia in CCHD patients may be an important etiological factor in the genesis of bacteremia and cerebral abscess. The affection of immune functions in ACHD cannot be adequately explained.