Impact of malnutrition on cardiac autonomic modulation in children

Area of Science:

• Pediatric cardiology
• Autonomic nervous system function
• Nutritional science

Background:

• Malnutrition significantly impacts child development and physiological functions.
• Autonomic nervous system (ANS) regulation is crucial for cardiovascular health.
• Heart rate variability (HRV) is a non-invasive marker of ANS activity.

Purpose of the Study:

• To investigate and compare the autonomic nervous system behavior in malnourished children versus a healthy control group.
• To analyze heart rate variability (HRV) indices to assess cardiac autonomic modulation in pediatric malnutrition.
• To determine the impact of malnutrition on sympathetic and parasympathetic activity.

Main Methods:

• Seventy children were categorized into malnourished and eutrophic groups based on Z-scores.
• Beat-to-beat heart rate was recorded for 20 minutes in a supine position.
• Linear methods in time and frequency domains were used for HRV analysis, with statistical comparison via Student's t-test and Mann-Whitney test.

Main Results:

• Malnourished children showed decreased systolic and diastolic blood pressure and increased heart rate compared to eutrophic children.
• Reduced activity in both sympathetic and parasympathetic branches of the ANS was indicated by HRV indices.
• Key HRV parameters including SDNN, rMSSD, NN50, pNN50, SD1, SD2, TINN, LF, and HF were significantly lower in malnourished children.

Conclusions:

• Pediatric malnutrition is associated with significant alterations in cardiac autonomic modulation.
• Malnourished children display diminished sympathetic and parasympathetic nervous system activity.
• The findings indicate increased heart rate and decreased blood pressure as physiological consequences of altered autonomic function in malnutrition.