Limited agreement between clinical assessment of infant colour at birth and oxygen saturation in a hospital in Ethiopia.

AIM: To evaluate the relationship between clinical assessment of infant colour and oxygen saturation at birth in a low-resource setting. METHODS: Classification of infant colour (cyanotic, pink or unclear) by midwives was compared to pulse-oximeter data at 60-90-120-300 seconds after birth in 60 neonates. RESULTS: Overall, oxygen saturation increased over time (P < .0001) and was different according to infant colour (P < .0001). Median oxygen saturation in pink infants was 87% at 60 seconds (n = 1), 90% (IQR 83-91) at 90 seconds (n = 5), 86% (IQR 81-94) at 120 seconds (n = 11) and 93% (IQR 90-96) at 300 seconds (n = 20). Median oxygen saturation in cyanotic infants was 60% (IQR 45-70) at 60 seconds (n = 52), 64% (IQR 52-69) at 90 seconds (n = 42), 63% (IQR 56-68) at 120 seconds (n = 35) and 66% (IQR 62-74) at 300 seconds (n = 22). Median oxygen saturation in unclear-coloured infants was 57% (IQR 56-60) at 60 seconds (n = 7), 78% (IQR 71-81) at 90 seconds (n = 13), 81% (IQR 79-88) at 120 seconds (n = 14) and 80% (IQR 76-84) at 300 seconds (n = 18). The proportion of infants with unclear colour ranged from 12% to 30%. CONCLUSION: The variability of oxygen saturation among pink and cyanotic infants, and the substantial proportion of unclear infant colour, suggest the possible benefit of the availability of pulse oximetry in low-resource settings.

Heart Rate Determination in Newborns at Risk for Resuscitation in a Low-Resource Setting: A Randomized Controlled Trial.

OBJECTIVE: To compare 2 different methods (auscultation with a stethoscope and umbilical cord palpation) of heart rate (HR) estimation in newborns at risk for resuscitation in a low-resource setting. STUDY DESIGN: Sixty newborns at risk for resuscitation born at the St. Luke Catholic Hospital in Wolisso (Ethiopia) were randomized to HR assessment by auscultation using a stethoscope or umbilical cord palpation. HR was assessed at 60, 90, 120 seconds, and 5 minutes of life. The primary outcome was the agreement of HR obtained by auscultation or palpation compared with the HR determined by electrocardiogram. RESULTS: Mean difference between auscultation using a stethoscope and electrocardiogram was -13 bpm, -4 bpm, -6 bpm, and -10 bpm at 60, 90, 120 seconds, and at 5 minutes of life. Mean difference between palpation and electrocardiogram of was -20 bpm, -25 bpm, -23 bpm, and -31 bpm at 60, 90, 120 seconds, and at 5 minutes of life. The magnitude of the difference between auscultation and electrocardiogram was lower than that between palpation and electrocardiogram over time (P = .007). HR range was correctly identified in 14 out of 16 measurements (87%) with HR <100 bpm. CONCLUSION: HR assessment by auscultation was more accurate compared with cord palpation, but both may provide adequate clinical information to healthcare providers in terms of HR ranges. The clinical advantage of providing a stethoscope in low-resource settings remains to be established. TRIAL REGISTRATION: ClinicalTrials.gov: NCT03854435.

Rotating-disc micro-solid phase extraction of F2-isoprostanes from maternal and cord plasma by using oxidized buckypaper as sorbent membrane.

This paper describes the development of an original micro-solid phase extraction device and its evaluation for the isolation of F2-isoprostanes (F2-IsoPs) from cord and maternal plasma samples. The unit is very simple and consists in a rotating disc (1.8 cm diameter) of oxidized buckypaper (BP), enwrapped in a polypropylene mesh pouch. Even if the selected F2-IsoPs have logP and pKa values that make them suitable candidates for their sorption on BP, several parameters were optimized to maximize recoveries: time of adsorption and desorption; stirring speed; volume, pH and ionic strength of the sample; type, volume, and fractions of the elution solvent; oxidation grade of BP. Among all, the last one was crucial in affecting extraction yields because of the analyte interactions with polar functionalities, introduced by a preliminary oxidative acid treatment. The investigation established the optimal oxidation time and highlighted the pros and cons of the acid activation step. All extracts were analyzed by means of liquid chromatography-tandem mass spectrometry (LC-MS/MS). Validation was performed according to the main FDA guidelines for bioanalytical methods. Depending on the spike level and analyte, recoveries ranged between 30 and 120% with precision and accuracy values lower than 20%. Quantitative analysis was accomplished by matrix-matched calibration curves whose determination coefficients were higher than 0.95. Lower limit of quantitation (LLOQ) spanned the range 2.45-6.77 µg L-1. The validated method was applied to the analysis of eight pairs of mother/child plasma samples, revealing the presence of 8-iso-15-keto-PGF2α and 8-iso-PGE2 at a concentration of about 10 µg L-1 in most cord plasma samples of preterm newborns.