scholarly journals Randomized Trial of Oxygen Saturation Targets during and after Resuscitation and Reversal of Ductal Flow in an Ovine Model of Meconium Aspiration and Pulmonary Hypertension

Children ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 594
Author(s):  
Amy L. Lesneski ◽  
Payam Vali ◽  
Morgan E. Hardie ◽  
Satyan Lakshminrusimha ◽  
Deepika Sankaran
Keyword(s):  
Blood Flow ◽  
Pulmonary Hypertension ◽  
Oxygen Saturation ◽  
Ductus Arteriosus ◽  
Neonatal Resuscitation ◽  
Meconium Aspiration Syndrome ◽  
Ovine Model ◽  
Neurodevelopmental Outcomes ◽  
Meconium Aspiration ◽  
Blood Flows

Neonatal resuscitation (NRP) guidelines suggest targeting 85–95% preductal SpO2 by 10 min after birth. Optimal oxygen saturation (SpO2) targets during resuscitation and in the post-resuscitation management of neonatal meconium aspiration syndrome (MAS) with persistent pulmonary hypertension (PPHN) remains uncertain. Our objective was to compare the time to reversal of ductal flow from fetal pattern (right-to-left), to left-to-right, and to evaluate pulmonary (QPA), carotid (QCA)and ductal (QDA) blood flows between standard (85–94%) and high (95–99%) SpO2 targets during and after resuscitation. Twelve lambs asphyxiated by endotracheal meconium instillation and cord occlusion to induce MAS and PPHN were resuscitated per NRP guidelines and were randomized to either standard (85–94%) or high (95–99%) SpO2 targets. Out of twelve lambs with MAS and PPHN, six each were randomized to standard and high SpO2 targets. Median [interquartile range] time to change in direction of blood flow across the ductus arteriosus from right-to-left, to left-to-right was significantly shorter with high SpO2 target (7.4 (4.4–10.8) min) compared to standard SpO2 target (31.5 (21–66.2) min, p = 0.03). QPA was significantly higher during the first 10 min after birth with higher SpO2 target. At 60 min after birth, the QPA, QCA and QDA were not different between the groups. To conclude, targeting SpO2 of 95–99% during and after resuscitation may hasten reversal of ductal flow in lambs with MAS and PPHN and transiently increase QPA but no differences were observed at 60 min. Clinical studies comparing low and high SpO2 targets assessing hemodynamics and neurodevelopmental outcomes are warranted.

scholarly journals Bidirectional Ductal Shunting and Preductal to Postductal Oxygenation Gradient in Persistent Pulmonary Hypertension of the Newborn

Children ◽  
2020 ◽  
Vol 7 (9) ◽  
pp. 137
Author(s):  
Amy Lesneski ◽  
Morgan Hardie ◽  
William Ferrier ◽  
Satyan Lakshminrusimha ◽  
Payam Vali
Keyword(s):  
Blood Flow ◽  
Pulmonary Hypertension ◽  
Pulmonary Blood Flow ◽  
Ductus Arteriosus ◽  
Arterial Oxygen Tension ◽  
Persistent Pulmonary Hypertension ◽  
Arterial Oxygen ◽  
Meconium Aspiration ◽  
Arterial Blood Gas ◽  
Arterial Blood

Background: The aim was to evaluate the relationship between the direction of the patent ductus arteriosus (PDA) shunt and the pre- and postductal gradient for arterial blood gas (ABG) parameters in a lamb model of meconium aspiration syndrome (MAS) with persistent pulmonary hypertension of the newborn (PPHN). Methods: PPHN was induced by intermittent umbilical cord occlusion and the aspiration of meconium through the tracheal tube. After delivery, 13 lambs were ventilated and simultaneous 129 pairs of pre- and postductal ABG were drawn (right carotid and umbilical artery, respectively) while recording the PDA and the carotid and pulmonary blood flow. Results: Meconium aspiration resulted in hypoxemia. The bidirectional ductal shunt had a lower postductal partial arterial oxygen tension ([PaO2] with lower PaO2/FiO2 ratio—97 ± 36 vs. 130 ± 65 mmHg) and left pulmonary flow (81 ± 52 vs. 133 ± 82 mL/kg/min). However, 56% of the samples with a bidirectional shunt had a pre- and postductal saturation gradient of < 3%. Conclusions: The presence of a bidirectional ductal shunt is associated with hypoxemia and low pulmonary blood flow. The absence of a pre- and postductal saturation difference is frequently observed with bidirectional right-to-left shunting through the PDA, and does not exclude a diagnosis of PPHN in this model.

In Reply: Cerebral Blood Flow

PEDIATRICS ◽  
1982 ◽  
Vol 70 (6) ◽  
pp. 1013-1014
Author(s):  
RAUL BEJAR
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Gastrointestinal Tract ◽  
Ductus Arteriosus ◽  
Left Ventricular ◽  
Blood Flows ◽  
Before And After ◽  
Regional Blood Flows ◽  
Left Ventricular Output ◽  
Patent Ductus

Baylen and Emmanouilides give the impression that their abstract was misquoted in our commentary. We would like to explain our interpretation of their data. In the abstract, Baylen et al indicate that they measured regional blood flows (RBF) in premature fetal lambs, expressing them as a percentage of the left ventricular output (LVO) before and after patent ductus arteriosus (PDA) closure. Their results (percent of LVO) before and after PDA closure were: lung, 42.7% vs 8.4% (P &lt; .01); carcass, 35% vs 55% (P &lt; .01); heart, 5.5% vs 10.2% (P &lt; .05); gastrointestinal tract, 5.1% vs 9.3% (P &lt; .05); brain, 2.7% vs 3.4% (P = NS); kidney, 2.2% vs 3.3% (P = NS); liver, 3.2% vs 5.7% (P = NS).

Persistent Pulmonary Hypertension and ECMO

PEDIATRICS ◽  
1990 ◽  
Vol 86 (5) ◽  
pp. 809-810
Author(s):  
ELCHANAN BRUCKHEIMER ◽  
ARTHUR I. EIDELMAN
Keyword(s):  
Pulmonary Hypertension ◽  
Extracorporeal Membrane Oxygenation ◽  
Meconium Aspiration Syndrome ◽  
Persistent Pulmonary Hypertension ◽  
Major Category ◽  
Inclusion Criteria ◽  
Meconium Aspiration ◽  
Membrane Oxygenation ◽  
Respiratory Treatment ◽  
The Relationship

To the Editor.— We read with interest Dr Gross' letter1 concerning the relationship between inborn and outborn infants with persistent pulmonary hypertension and the relevance of "classical" extracorporeal membrane oxygenation (ECMO) inclusion criteria and outcome of therapy. We wholly agree with his observation that early skilled respiratory treatment of infants with persistent pulmonary hypertension to a large extent can obviate the need for ECMO, and we wish to report our experience. As has been noted, the major category of patients requiring ECMO are those with severe meconium aspiration syndrome.2

scholarly journals Perinatal Outcome Associated with Meconium Stained Amniotic Fluid In Pregnancy

2015 ◽  
Vol 4 (2) ◽  
pp. 44-49 ◽  
Author(s):  
Nasrin Begum ◽  
Sharmeen Mahmood ◽  
Salma Akhter Munmun ◽  
MS Haque ◽  
KN Nahar ◽  
...  
Keyword(s):  
Birth Weight ◽  
Amniotic Fluid ◽  
Apgar Score ◽  
Perinatal Outcome ◽  
Perinatal Death ◽  
Mode Of Delivery ◽  
Neonatal Resuscitation ◽  
Meconium Aspiration Syndrome ◽  
Meconium Aspiration ◽  
Meconium Stained Amniotic Fluid

Objectives: To evaluate perinatal outcome associated with meconium stained amniotic fluid in pregnant women.Methods: It was a prospective cross sectional study, conducted in the Department of Obstetrics and Gynecology in Bangabandhu Sheikh Mujib Medical University, Dhaka, from January 2013 to December 2013. Total 50 pregnant women admitted in the labour ward for delivery with meconium stained amniotic fluid were the study population. Singleton pregnancy of more than 34 weeks duration was included and pregnancy with APH, breech presentation, congenital malformation of fetus, IUD were excluded from the study. Out of 50 patients two did not provide all the information needed to analyze the data and hence were excluded. Outcome Variables were gestational age, antenatal checkup, medical diseases of mother (HTN, Diabetes mellitus, Heart disease), obstetric complication (oligohydramnios, prolonged labour), mode of delivery, neonatal details (weight of the baby in kg, APGAR scoring at 1 min & 5 min), neonatal resuscitation, admission in neonatal ICU(NICU), neonatal complications (RDS, MAS, Neonatal death).Results: Over half (52.1%) of the neonates needed resuscitation and 54.2% admitted in ICU. About 90% of the neonates had normal birth weight and only 10.4% were of low birth weight. 14.6% of the neonates developed meconium aspiration syndrome and 10.4% respiratory distress syndrome. Neonatal jaundice and neonatal sepsis were observed in 4.2% neonates each. Four neonates (8.3%) died early in the neonatal life, while 1 (2.1 %) was still-born. Low APGAR score (<7) at 1 and 5 minutes of birth was found in 64.7% and 52.9% of the cases respectively with thick meconium stained amniotic fluid as opposed to 25.8% and 16.1% of the cases respectively having thin meconium stained amniotic fluid (p = 0.008 and p = 0.007 respectively). Thick meconium was significantly associated with meconium aspiration syndrome (p = 0.003). Neonates needing immediate resuscitation and admission in ICU was staggeringly higher in the former group than those in the later group (p = 0.002). The incidence of perinatal death was significantly higher in patients with thick meconium stained amniotic fluid than that in patients with thin meconium ( p= 0.021).Conclusion: Meconium stained amniotic fluid was associated with low APGAR score, higher incidence of MAS, ICU admission and perinatal death.J. Paediatr. Surg. Bangladesh 4(2): 44-49, 2013 (July)

scholarly journals Postnatal causes and severity of persistent pulmonary Hypertension of Newborn

2021 ◽  
Vol 37 (5) ◽  
Author(s):  
Muhammad Sohail Arshad ◽  
Mudasser Adnan ◽  
Hafiz Muhammad Anwar-ul-Haq ◽  
Arif Zulqarnain
Keyword(s):  
Pulmonary Hypertension ◽  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Gestational Age ◽  
Distress Syndrome ◽  
Birth Asphyxia ◽  
Meconium Aspiration Syndrome ◽  
Persistent Pulmonary Hypertension ◽  
High Morbidity ◽  
Meconium Aspiration

Background & Objective: Persistent pulmonary hypertension of the newborn (PPHN) is described as severe respiratory failure along with hypoxaemia. PPHN is known to be linked with high morbidity and mortality around the world. This study was planned to determine the postnatal causes and assess the severity of persistent pulmonary hypertension of newborn in babies presenting to the Children’s Hospital, Multan. Methods: This observational study was conducted at the Department of Paediatric Cardiology, The Children Hospital &Institute of Child Health, Multan, Pakistan from July to December 2019. A total of 122 confirmed cases of PPHN admitted having gestational age above 34 weeks were enrolled. Demographic data of the newborns was recorded along with maternal medical history, pregnancy status and postnatal causes of PPHN. Severity of PPHN was also recorded. Results: Out of a total of 122 cases of PPHN, 81 (66.3%) were male. Majority, 78 (64.0%) had gestational age above 37 weeks. Mode of delivery as cesarean section was noted in 70 (57.4%). Meconium aspiration syndrome 52 (42.6%), birth asphyxia 48 (39.3%), respiratory distress syndrome 23 (18.8%) and sepsis 33 (27.0%) were found to be the commonest causes of PPHN. Severe PPHN was found to be the most frequent, noted among 63 (51.6%) while Moderate PPHN was observed in 40 (32.8%) and Mild PPHN in 19 (15.6%). Morality was noted among 26 (21.3%) of cases. Conclusion: Meconium aspiration syndrome, birth asphyxia and respiratory distress syndrome were the commonest postnatal causes of PPHN. Severe PPHN was found to be the most frequent form of PPHN. doi: https://doi.org/10.12669/pjms.37.5.2218 How to cite this:Arshad MS, Adnan M, Anwar-ul-Haq HM, Zulqarnain A. Postnatal causes and severity of persistent pulmonary Hypertension of Newborn. Pak J Med Sci. 2021;37(5):---------. doi: https://doi.org/10.12669/pjms.37.5.2218 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Steroids in full term infants with respiratory failure and pulmonary hypertension due to meconium aspiration syndrome

2001 ◽  
Vol 160 (3) ◽  
pp. 150-153 ◽  
Author(s):  
David Eustace da Costa ◽  
Arun Kumar Nair ◽  
Mangalore Govind Pai ◽  
Saleh Mohammed Al Khusaiby
Keyword(s):  
Pulmonary Hypertension ◽  
Respiratory Failure ◽  
Meconium Aspiration Syndrome ◽  
Full Term ◽  
Term Infants ◽  
Meconium Aspiration

Abstract 14185: Targeting Lower Oxygen Saturation Parameters in Premature Infants Does Not Increase Incidence of Pulmonary Hypertension in the Neonatal Intensive Care Unit

Circulation ◽  
2020 ◽  
Vol 142 (Suppl_3) ◽  
Author(s):  
Maria Niccum ◽  
Fotios Spyropoulos ◽  
Jonathan Levin ◽  
Carter Petty ◽  
Mary P Mullen ◽  
...  
Keyword(s):  
Pulmonary Hypertension ◽  
Logistic Regression ◽  
Birth Weight ◽  
Oxygen Saturation ◽  
Preterm Infants ◽  
Ductus Arteriosus ◽  
Positive Association ◽  
Increased Risk ◽  
Significant Difference ◽  
Lower Oxygen

Introduction: Lower oxygen saturation targets in preterm infants have been associated with decreased incidence of bronchopulmonary dysplasia (BPD) but increased risk of pulmonary hypertension (PH). Studies have shown that targets of <90% are associated with higher incidence of PH, however data on the optimal saturation target >90% are lacking. In this study, we compared the rate of BPD and PH in two cohorts with saturation targets of 94-98% and 92-97%. We hypothesized that BPD rate would be lower and PH rate would be unchanged at the lower saturation target. Methods: We performed a retrospective cohort study comparing PH and BPD rates among two cohorts of infants born at ≤32 weeks gestation at Brigham and Women’s Hospital: cohort 1 with saturation target of 94-98% (n = 129, July 2017-July 2018), cohort 2 with saturation target of 92-97% (n = 124, July 2018-July 2019). PH was defined by echocardiographic evidence of systolic septal flattening or right ventricular pressure ≥35 mmHg (estimated by tricuspid regurgitant jet velocity or shunt velocity) at gestational age (GA) ≥36 weeks. Comparisons between groups were carried out by Chi-square test, t-test, and multivariable logistic regression. Results: Subjects had a GA of 23-32 weeks; 46% were female. Groups did not differ with respect to GA, sex, or birth weight. There was no difference in rate of PH (2.4% vs. 4.2%, p = 0.12) or BPD (25% vs. 20%, p = 0.31) between cohort 1 and cohort 2. Other clinical parameters were not different between groups, including presence of patent ductus arteriosus, presence of atrial septal defect, use of diuretics, or use of steroids. After controlling for GA, birth weight, sex, and diagnosis of BPD using logistic regression, there was no difference in rate of PH between groups (p = 0.47), but there was a positive association of BPD with PH (OR 3.45; 95% CI, 1.18-10.09; p = 0.02). Conclusions: A lower oxygen saturation target was not associated with a higher rate of PH or lower rate of BPD in preterm infants. The overall rate of PH was much lower than rates previously reported at saturation targets <90%. Given our low incidence of PH, and the lack of a significant difference in rate of PH between groups, a saturation target of 92-97% may be safe while also minimizing need for supplemental oxygen in this population.

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