Case Report

Chlamydial Pneumonitis: A Creepy Neonatal Disease

Table 1

Respiratory indices.


Ventilation indexN/APrognostic marker of lung injury (
Alveolar-arterial oxygen gradient<50.9Impaired diffusion or shunting (
Oxygenation index3.7Denotes risk of treatment (
PaO2/FiO2 ratio>271Severity of lung injury: ALI < 300, ARDS < 200 (
<4%Intrapulmonary shunt and V/Q mismatch, normally <5%

= (CcO2 − CaO2)/(CcO2 − CvO2). The oxygen content of mixed arterial blood (CaO2) is determined by the content of oxygen in the blood that reached ventilated alveoli (CcO2), the content of oxygen in blood that bypassed ventilated alveoli (CvO2), and the proportion of the two. CcO2 is the content of oxygen in pulmonary capillary blood and is estimated by plugging in 100% as the saturation since the PcO2 (pulmonary capillary PO2) can be assumed to be high enough to assure 100% saturation.
Mean airway pressure in a spontaneous breathing neonate is assumed to be 10 cmH2O.