Effect of hyperventilation on total calcium, ionized calcium, and serum phosphorus in neonates

Area of Science:

• Neonatal Medicine
• Pediatric Cardiology
• Clinical Chemistry

Background:

• Persistent pulmonary hypertension (PPH) is a critical condition in neonates.
• Alkalosis, often induced by hyperventilation therapy, is common in managing PPH.
• The metabolic consequences of alkalosis in this population require further elucidation.

Purpose of the Study:

• To investigate the impact of induced alkalosis on calcium and phosphorus levels in infants with PPH.
• To determine the correlation between blood pH and ionized calcium concentrations.
• To assess the clinical significance of these biochemical changes in neonates with PPH.

Main Methods:

• Seven infants diagnosed with PPH were monitored.
• Measurements of total calcium, ionized calcium, and serum phosphorus were taken before, during, and after hyperventilation.
• Correlation analysis was performed between blood pH and ionized calcium levels.

Main Results:

• Hyperventilation-induced alkalosis led to significant reductions in total calcium, ionized calcium, and serum phosphorus.
• An inverse correlation was observed between blood pH and ionized calcium (Ca+2), with a 0.1 pH unit increase decreasing Ca+2 by 0.42 mg/dl.
• Two infants experienced ionized calcium levels below 2.5 mg/dl during hyperventilation.

Conclusions:

• Induced alkalosis in neonates with PPH causes substantial decreases in calcium and phosphorus.
• These biochemical alterations, particularly low ionized calcium, pose potential risks to neonates with PPH.
• Careful monitoring of electrolytes is crucial during hyperventilation therapy for PPH.