Left atrial strain assessment unveils left ventricular diastolic dysfunction in neonates with transient tachypnea of the newborn: A prospective observational study.

INTRODUCTION: An inadequate clearance of lung fluid plays a key role in the pathogenesis of transient tachypnea of the newborn (TTN). OBJECTIVES: To evaluate if left ventricular diastolic dysfunction contributes to reduced clearance of lung fluid in TTN. MATERIALS AND METHODS: This was a prospective, observational study. Echocardiography and lung ultrasound were performed at 2, 24 and 48 h of life (HoL) to assess biventricular function and calculate lung ultrasound score (LUS). Left atrial strain reservoir (LASr) provided surrogate measurement of left ventricular diastolic function. RESULTS: Twenty-seven neonates with TTN were compared with 27 controls with no difference in gestation (36.1 ± 2 vs. 36.9 ± 2 weeks) or birthweight (2508 ± 667 vs. 2718 ± 590 g). Biventricular systolic function was normal in both groups. LASr was significantly lower in cases at 2 (21.0 ± 2.7 vs. 38.1 ± 4.4; p < 0.01), 24 (25.2 ± 4.5 vs. 40.6 ± 4.0; p < 0.01) and 48 HoL (36.5 ± 5.8 and 41.6 ± 5.2; p < 0.01), resulting in a significant group by time interaction (p < 0.001), after adjusting for LUS and gestational diabetes. A logistic regression model including LUS, birth weight and gestational diabetes as covariates, showed that LASr at 2 HoL was a predictor of respiratory support at 24 HoL, with an adjusted odds ratio of 0.60 (CI 0.36-0.99). CONCLUSIONS: LASr was reduced in neonates with TTN, suggesting diastolic dysfunction, that may contribute to the delay in lung fluid clearance.

Neonatal respiratory complications in twins at 36-38 weeks of gestation.

BACKGROUND: Twin pregnancies are associated with a high risk of perinatal mortality and morbidity. Late preterm or early term delivery is frequently performed to avoid unexpected fetal death in uncomplicated twin pregnancies. Nonetheless, delivery before full term is associated with neonatal respiratory complications. This study aimed to evaluate perinatal respiratory complications in twins delivered between 36 and 38 weeks of gestation. METHODS: A retrospective cohort study was conducted on twins delivered between 36 and 38 weeks of gestation from January 2008 to June 2020. The primary outcomes were the incidence of composite neonatal respiratory morbidity, which included respiratory distress syndrome, transient tachypnea of the newborn, meconium aspiration syndrome, mechanical ventilation or continuous positive airway pressure according to gestational age at delivery, and chorionicity. The relationship between gestational age at delivery and composite neonatal respiratory morbidity was evaluated using multivariate logistic regression analysis adjusted for potential confounders. RESULTS: This study included 1608 twins (614 monochorionic diamniotic twins, 994 dichorionic diamniotic twins). At 36, 37, and 38 weeks of gestation, the frequencies of composite neonatal respiratory morbidity were 19.4%, 10.7%, and 9.2% in dichorionic diamniotic twins and 13.6%, 8.7%, and 9.4% in monochorionic diamniotic twins, respectively. In dichorionic diamniotic twins, the composite neonatal respiratory morbidity rate was higher for twins delivered at 36 weeks of gestation than for those delivered at 37 weeks. No significant differences between monochorionic diamniotic twins were detected. CONCLUSIONS: In uncomplicated dichorionic diamniotic twin pregnancies, delivery should be considered after 37 weeks of gestation to reduce neonatal respiratory complications.

Risk of Transient Tachypnea of the Newborn following Elective Cesarean Section Increases at a Gestational Age of 37 Weeks Compared to That at ≥ 38 Weeks Despite the Exclusion of Pre-Existing Risk Factors for Neonatal Respiratory Disorders.

Background: Elective cesarean sections (ECSs) for early-term pregnancies at 37 weeks of gestational age (GA) aim to reduce the risk of emergency cesarean sections due to the onset of labor or rupture of membranes. However, resultant increases in neonatal respiratory disorders, including transient tachypnea of the newborn (TTN) have been observed. However, few studies have elucidated the associated risk factors. Consequently, we aimed to determine whether differences existed in the clinical outcomes between neonates delivered via ECS at 37 weeks and those delivered at ≥ 38 weeks of GA. Methods: A retrospective analysis was conducted on 259 neonates born via ECS at Tottori University Hospital, between January 2013 and December 2019, with birthweights ≥ 2500 g and GAs > 37 weeks. The neonates were categorized into two cohorts: births at 37 and at ≥ 38 weeks of GA (37-week and 38-week cohorts). The principal clinical outcomes included the appearance, pulse, grimace, activity, and respiration (Apgar) scores, need for positive-pressure ventilation, incidence of TTN, and length of hospital stay. Results: No statistically significant differences were observed in the indications for ECS, sex, or birthweight between the two cohorts. The 37-week cohort exhibited a lower 1-min Apgar score than did the 38-week cohort, with no statistically significant differences between the two cohorts, at 5 min. Statistically significant differences were not observed in the need for positive-pressure ventilation during initial resuscitation or length of hospital stay for patients with TTN between the two cohorts. Notably, the 37-week cohort exhibited a significantly higher incidence of TTN than did the 38-week cohort. Conclusion: ECSs at 37 weeks of GA exhibited an increased risk of TTN than ECSs at ≥ 38 weeks of GA. Strategic neonatal care and adequate preparation can mitigate this risk without affecting the length of hospital stay.

Safety and Efficacy of 2.5 mg and 1.25 mg Nebulized Salbutamol Compared with Placebo on Transient Tachypnea of the Newborns: A Triple-Blind Phase II/III Parallel Randomized Controlled Trial.

Background: To evaluate the safety and efficacy of 2.5 and 1.25 mg nebulized salbutamol on Transient Tachypnea of the Newborn (TTN) compared with placebo. Methods: We conducted a triple-blind, phase II/III parallel randomized controlled trial in two university-affiliated hospitals with neonatal intensive care units. Newborns with a confirmed diagnosis of TTN, with gestational age >35 weeks and gestational weight >2 kg were included. Cases of asphyxia, meconium aspiration syndrome, and persistent pulmonary hypertension were excluded. Ninety eligible patients were randomly allocated in three intervention groups (2.5 mg salbutamol, 1.25 mg salbutamol, and placebo), and a single-dose nebulized product was prescribed 6 hours after the birth. Safety outcomes included postintervention tachycardia, hyperglycemia, hypokalemia, and changes in blood pressure. To evaluate the efficacy, the duration of postintervention tachypnea, TTN clinical score, and clinical and paraclinical respiratory indices were assessed. Parents, Outcome assessors, and data analyzer were blind to the intervention. Results: There was no adverse reaction, including tachycardia, hypokalemia, and jitteriness. Both groups of salbutamol recipients showed significant improvement regarding respiratory rate, TTN clinical score, and oxygenation indices compared with the placebo (p-values <0.001). Nonstatistically significant higher hospital stay was observed in the placebo group. Single 2.5 mg salbutamol nebulization showed a little better outcome than the dose of 1.25 mg, although we could not find statistical superiority. Conclusion: The newly applied single high dose of 2.5 mg nebulized salbutamol is safe in treating TTN and leads to notable faster improvement of respiratory status without any considerable adverse reaction. Registry code: IRCT20190328043133N1.

Thoracic fluid content (TFC) using electrical cardiometry versus lung ultrasound in the diagnosis of transient tachypnea of newborn.

This study aimed to evaluate TFC by EC versus lung ultrasound (LUS) findings for diagnosing and follow-up of TTN in late preterm and term neonates. This prospective observational study was conducted on 80 neonates with gestational age ≥ 34 weeks. TTN group included 40 neonates diagnosed with TTN, and no lung disease (NLD) group included 40 neonates without respiratory distress. LUS and EC were performed within the first 24 h of life and repeated after 72 h. There was a statistically significant increase in TFC in TTN group on D1 [48.48 ± 4.86 (1 KOhm-1)] compared to NLD group [32.95 ± 4.59 (1 KOhm-1)], and then significant decrease in TFC in D3 [34.90 ± 4.42 (1 KOhm-1)] compared to D1 in the TTN group. There was a significant positive correlation between both TFC and LUS with Downes' score, TTN score, and duration of oxygen therapy in the TTN group.   Conclusion: Both LUS and TFC by EC provide good bedside tools that could help to diagnose and monitor TTN. TFC showed a good correlation with LUS score and degree of respiratory distress. What is Known: • Transient tachypnea of the newborn (TTN) is the most common cause of respiratory distress in newborns. • TTN is a diagnosis of exclusion, there are no specific clinical parameters or biomarker has been identified for TTN. What is New: • Thoracic fluid content (TFC) by electrical cardiometry is a new parameter to evaluate lung fluid volume and could help to diagnose and monitor TTN and correlates with lung ultrasound score.

Influence of the chest wall on respiratory function at birth in near-term lambs.

Airway liquid is cleared into lung tissue after birth, which becomes edematous and forces the chest wall to expand to accommodate both the cleared liquid and incoming air. This study investigated how changing chest wall mechanics affects respiratory function after birth in near-term lambs with different airway liquid volumes. Surgically instrumented near-term lambs (139 ± 2 days) were randomized into Control (n = 7) or Elevated Liquid (EL; n = 6) groups. Control lambs had lung liquid drained to simulate expected volumes following vaginal delivery. EL lambs had airway liquid drained and 30 mL/kg liquid returned to simulate expected airway liquid volumes after elective cesarean section. Lambs were delivered, transferred to a Perspex box, and ventilated (30 min). Pressure in the box was adjusted to apply positive (7-8 cmH2O above atmospheric pressure) or negative (7-8 cmH2O below atmospheric pressure) pressures for 30 min before pressures were reversed. External negative pressures expanded the chest wall, reduced chest wall compliance (CCW) and increased lung compliance (CL) in Control and EL lambs. External positive pressures compressed the chest wall, increased CCW and reduced CL in Control and EL lambs. External negative pressure improved pulmonary oxygen exchange, reducing the alveolar-arterial difference in oxygen (AaDO2) by 69 mmHg (95% CI [13, 125]; P = 0.016) in Control lambs and by 300 mmHg (95% CI [233, 367]; P < 0.001) in EL lambs. In contrast, external positive pressures impaired pulmonary gas exchange, increasing the AaDO2 by 179 mmHg (95% CI [73, 285]; P = 0.002) in Control and by 215 mmHg (95% CI [89, 343]; P < 0.001) in EL lambs. The application of external thoracic pressures influences respiratory function after birth.NEW & NOTEWORTHY This study investigated how changes in chest wall mechanics influence respiratory function after birth. Our data indicate that the application of continuous external subatmospheric pressure greatly improves respiratory function in near-term lambs with respiratory distress, whereas external positive pressures impair respiratory function. Our findings indicate that, during neonatal resuscitation at birth, the forces applied to the chest wall should not be ignored as they can have a major impact on neonatal respiratory function.

Neonatal point-of-care lung ultrasound: what should be known and done out of the NICU?

Lung ultrasound is rapidly becoming a useful tool in the care of neonates: its ease of use, reproducibility, low cost, and negligible side effects make it a very suitable tool for the respiratory care of all neonates. This technique has been extensively studied by different approaches in neonatal intensive care unit (NICU), both for diagnostic and prognostic aims and to guide respiratory treatments. However, many neonates are being born in level I/II hospitals without NICU facilities so all pediatricians, not just neonatal intensivists, should be aware of its potential. This is made possible by the increasing access to ultrasound machines in a modern hospital setting. In this review, we describe the ultrasonographic characteristics of the normal neonatal lung. We also discuss the ultrasound features of main neonatal respiratory diseases: transient tachypnea of the neonate (TTN), respiratory distress syndrome (RDS), meconium aspiration syndrome (MAS), pneumothorax (PNX), pleural effusion (PE), or pneumonia. Finally, we mention two functional approaches to lung ultrasound: 1. The use of lung ultrasound in level I delivery centers as a mean to assess the severity of neonatal respiratory distress and request a transport to a higher degree structure in a timely fashion. 2. The prognostic accuracy of lung ultrasound for early and targeted surfactant replacement. CONCLUSION:  LU is still a useful tool in level I/II neonatal units, both for diagnostic and functional issues. WHAT IS KNOWN: • Neonatal lung ultrasound has been recently introduced in the usual care in many Neonatal Intensive Care Units. WHAT IS NEW: • It also has many advantages in level I/II neonatal units, both for neonatologist or even pediatricians that treat neonates in those sites.

Diagnostic efficacy of lung ultrasound and X-ray for neonatal respiratory distress syndrome and transient tachypnea / 中国医学影像技术

Objective To compare the efficacy of lung ultrasound and chest X-ray for diagnosis of neonatal transient respiration syndrome (TTN) and respiratory distress syndrome (RDS).Methods Totally 120 infants with respiratory distress underwent lung ultrasound and chest X-ray within 6 h after birth.Taking clinical diagnosis as the standard,the sensitivity,specificity and accuracy of lung ultrasound and X-ray for diagnosis of TTN and RDS were calculated.Results According to clinical diagnosis,there were 75 infants of TTN and 34 of RDS.The sensitivity,specificity and accuracy of lung ultrasound in diagnosis of TTN was 96.00％ (72/75),88.89％ (40/45) and 93.33％ (112/120),respectively,higher than those of chest X-ray (85.33％ [64/75],84.44％ [38/45] and 85.00％ [102/120]).Lung ultrasound showed 85.29％ (29/34) of sensitivity,95.35％ (82/86) of specificity and 92.50％ (111/120) of accuracy for diagnosis of RDS,whereas chest X-ray showed 88.23％ (30/34) of sensitivity,89.53％ (77/86) of specificity and 89.17％ (107/120) of accuracy.Conclusion Lung ultrasound is accurate for the diagnosis of TTN and RDS.

Taquipnea transitoria del recién nacido asociada a cesárea con y sin labor de parto / Transient tachypnea of ​​the newborn associated with caesarean section with and without labor

Contexto: la taquipnea transitoria del recién nacido (TTRN) es una entidad frecuente en neonatos nacidos por cesárea. Objetivo: identificar factores de riesgo potencialmente modificables que contribuyan a la disminución de la patología respiratoria neonatal derivada de un parto por cesárea Sujetos y métodos: se presenta un estudio observacional retrospectivo de cohorte analítico que identifico expedientes clínicos de recién nacidos por cesárea, atendidos en el Hospital de la Policía Quito N°1 en el periodo enero de 2001 a diciembre de 2015; el estudio incorporó neonatos entre 35 y 41 semanas de gestación, a quienes se clasificaron en 2 grupos: con y sin labor de parto previo a la cesárea. Resultados: la frecuencia de recién nacidos con taquipnea transitoria que se determinó en el presente estudio fue 25,6%, 29,4% y 44,8% en los respectivos grupos de edad gestacional determinándose una proporción es 5,1:1; 1,9:1 y 0,5:1 para cada grupo por lo que la relación entre un pretérmino leve frente a RN a término es 10 veces mayor para el grupo que desarrolla TTRN. Existe una mayor frecuencia de TTRN en neonatos de cesáreas sin labor de parto previa comparado con el grupo de neonatos nacidos por cesárea con labor de parto previa; esta diferencia es estadísticamente significativa con un OR de 5,8. Conclusión: se determinó que la labor de parto previa a la cesárea, constituyo un factor protector para taquipnea transitoria del recién nacido en neonatos entre 35 y 38 semanas. La labor de parto previa a la cesárea no fue un factor de protección frente al riesgo de desarrollar taquipnea transitoria del recién nacido en neonatos de 39 o más semana de gestación.(AU)

Context: transient tachypnea of the newborn (TTRN) is a frequent entity in neonates born by caesarean section, Objective: identify potentially modifiable risk factors that contribute to the reduction of neonatal respiratory pathology derived from a cesarean delivery Subjects and methods: We present a retrospective observational study of an analytical cohort that identified clinical records of newborns by caesarean section, attended at Quito Police Hospital No. 1 in the period January 2001 to December 2015; The study included neonates between 35 and 41 weeks of gestation, who were classified into 2 groups: with and without labor prior to cesarean section. Results: the frequency of newborns with transient tachypnea that was determined in the present study was 25.6%, 29.4% and 44.8% in the respective gestational age groups determining a proportion is 5.1: 1; 1.9: 1 and 0.5: 1 for each group, so that the relationship between a preterm mild versus a term BN is 10 times higher for the group that develops TTRN. There is a greater frequency of TTRN in neonates of caesarean sections without previous labor compared with the group of neonates born by caesarean section with previous labor; this difference is statistically significant with an OR of 5.8. Conclusion: labor prior to caesarean section constitutes a protective factor for transient tachypnea of thnewborn in neonates between 35 and 38 weeks. Labor prior to cesarean section is not a protective factor againsthe risk of developing transient tachypnea of the newborn in infants of 39 or more weeks of gestation.(AU)

Comparação entre o método Reequilíbrio Toracoabdominal e a fisioterapia respiratória convencional em recém-nascidos com taquipneia transitória: um ensaio clínico randomizado / Comparison between Thoracic-abdominal Rebalance Method and conventional respiratory physiotherapy in neonates with transient tachypnea: a randomized clinical trial

Introdução: Recém-nascidos acometidos pela taquipneia transitória do recém-nascido (TTRN) cursam com desequilíbrio da biomecânica toracoabdominal e desconforto respiratório e necessitam de cuidados especiais. A fisioterapia respiratória convencional em recém-nascidos tem efeitos adversos, podendo ser o método reequilíbrio toracoabdominal (RTA) uma alternativa terapêutica. Objetivo: Comparar a fisioterapia respiratória convencional com o método RTA em recém-nascidos com TTRN. Métodos: Ensaio clínico intervencional, comparativo e randomizado. 49 recém-nascidos foram divididos em dois grupos: fisioterapia respiratória convencional (n=20) e RTA (n=29). Parâmetros fisiológicos (frequência respiratória, frequência cardíaca, saturação de pulso de oxigênio, temperatura axila), dor, estado comportamental, desconforto respiratório e desequilíbrio da biomecânica respiratória foram avaliados antes e após os manuseios. Resultados: A mediana da idade gestacional foi 38 semanas e a do peso de nascimento 2.940 g. Após os manuseios, não houve diferença entre os grupos quanto à dor (p=0,63), o estado comportamental (p=0,11) e os parâmetros fisiológicos (frequência respiratória, p=0,18; frequência cardíaca, p=0,82; SpO2, p=0,74; temperatura axila, p=0,29). O método RTA mostrou-se superior a fisioterapia respiratória convencional na melhora da biomecânica respiratória (elevação do esterno, p=0,01; elevação dos ombros, p=0,02) e do desconforto respiratório (p=0,009). Conclusão: O método RTA mostrou-se seguro e superior à fisioterapia respiratória convencional em recém-nascidos com TTRN. (AU)

Introduction: Newborn infants who are affected by transient tachypnea of the newborn (TTNB) have an imbalance of thoracoabdominal biomechanics and respiratory distress and so, require special care. The conventional respiratory physiotherapy in newborns has adverse effects, and the Thoracic-Abdominal Rebalance (TAR) method may be a therapeutic alternative. Objective: To compare conventional respiratory physiotherapy and TAR method in newborns with TTNB. Methods: Randomized, comparative, interventional clinical trial. 49 newborn infants divided into two groups: conventional respiratory physiotherapy (n=20) and TAR method (n=29). Physiological parameters (respiratory rate, heart rate, pulse oxygen saturation (SpO2), axilla temperature), pain, behavioral status, respiratory discomfort, and imbalance of respiratory biomechanics were evaluated before and after handling. Results: The median of gestational age of 38 weeks, and birthweight was 2,940 g. After the interventions, we did not observe difference between the groups regarding pain (p=0.63), behavioral status (p=0.11) and physiological parameters (respiratory rate, p=0.18; heart rate, p=0.82; SpO2, p=0.74 and axilla temperature, p=0.29). The TAR method was better than conventional respiratory physiotherapy in improvement of respiratory biomechanics (sternum elevation, p=0.01, elevation of the shoulders, p=0.02) and respiratory distress (p=0.009). Conclusion: The TAR method proved to be safe and superior to conventional respiratory physiotherapy in newborn infants with TTNB. (AU)

Empirical Antibiotic Therapy in Transient Tachypnea of the Newborn / 대한주산의학회잡지

PURPOSE: Transient tachypnea of the newborn (TTN) is a respiratory disorder resulting from delayed clearance of fetal lung fluid. Initiation of empiric antibiotic therapy for possible early-onset sepsis is usually recommended until negative blood cultures for 48 hours. The aim of this study was to compare outcomes of infants with TTN managed with a risk-factor-based restrictive antibiotic use policy. METHODS: A single institution retrospective study was conducted on full-term infants admitted with TTN from January, 2008 to December, 2013. Infants were stratified into two groups based on whether they received or did not receive antibiotics. The decision to administer antibiotics depended upon the covering physician at admission. The clinical and laboratory outcomes were evaluated between two groups. RESULTS: A total of 98 full-term infants diagnosed with TTN were admitted to the neonatal intensive care unit; of them 39 (39.8%) received and 59 (60.2%) did not receive antibiotics. Physicians had tendency to start antibiotics in patient with mild-to-moderate chest retraction, need oxygen therapy, high white blood cell count, segmented neutrophil and positive C-reactive protein. All of them had negative blood cultures, no readmission, and no late-onset sepsis. The duration of hospital stay was longer in patients received antibiotics group (10.7+/-3.0 days vs. 9.0+/-4.4 days, P=0.04). CONCLUSION: This study suggests that empiric antibiotic therapy may not be recommended for full-term infants with classic TTN without perinatal risk factors. With the application of strict criteria for classic TTN and the close observation, the empiric use of antibiotics may be avoidable.

Evaluación de la calidad de la atención de la taquipnea transitoria en recién nacidos afiliados al Seguro Médico Siglo XXI / Evaluation of the quality of care of transient tachypnea in newborns affiliated with the Medical Insurance Siglo XXI program

Introducción: La evaluación de la calidad de la atención del recién nacido con complicaciones es un elemento indispensable para las estrategias de mejora orientadas a reducir las tasas de mortalidad neonatal. El objetivo de este trabajo fue evaluar la calidad de atención técnica e interpersonal en el manejo de la taquipnea transitoria del recién nacido (TTRN) de pacientes afiliados al Seguro Médico Siglo XXI. Métodos: Se realizó un estudio transversal en 61 hospitales de la Secretaría de Salud, que durante el primer semestre de 2011 reportaron al menos dos casos de TTRN. Se analizaron diferentes variables con respecto a la madre, el embarazo, el nacimiento y las complicaciones neonatales, así como intervenciones realizadas al recién nacido y condiciones de salud al egreso. Para medir la calidad de atención, se definieron y validaron indicadores de calidad en los ámbitos de la prevención, diagnóstico y tratamiento. Resultados: Se analizaron 256 expedientes de casos con diagnóstico de TTRN. El 8.9% de las madres tenía alguno de los factores de riesgo (asma, diabetes) y el 53.5% presentó complicaciones en el embarazo. El 60% de los casos de TTRN nacieron por cesárea; un tercio tuvieron bajo peso al nacimiento y el 14% fueron trasladados a otro hospital. En cuanto a los indicadores de calidad, en el rubro de prevención se identificó que en más del 90% se registraron los factores de riesgo (tabaquismo, asma, parto por cesárea); los de diagnóstico reflejaron que en el 86-98% se buscaron manifestaciones de insuficiencia respiratoria. Los de tratamiento lograron cifras satisfactorias para las medidas de monitorización y soporte. Conclusiones: Los resultados permiten considerar que la mayoría de los casos con TTRN recibieron un tratamiento apropiado. Es recomendable desarrollar estrategias efectivas, como reducir la creciente tasa de partos por cesárea, para prevenir la TTRN.

Background: Evaluation of the quality of care of the newborn with complications is an indispensable element for the improvement of strategies directed to reduce newborn mortality rates. The aim of this work was to evaluate the quality of technical and interpersonal care in the management of transient tachypnea of the newborn (TTN) of patients affiliated with the program "Medical Insurance Siglo XXI". Methods: A cross-sectional study was conducted in 61 hospitals affiliated with the Health Ministry with at least two cases of TTN during the first semester of 2011. Variables such as mother's health, pregnancy, birth and birth complication characteristics were analyzed. Also, newborn interventions and health conditions upon discharge were included. To measure the quality of care according to prevention, diagnosis and treatment, quality indicators were defined and validated. Results: We analyzed 256 case files with a diagnosis of TTN; 8.9% of the mothers presented risk factors (asthma, diabetes) and 53.5% had complications during pregnancy. There were 60% of cases with TTN born by cesarean delivery; one third of these children had low birth weight and 14% were transferred to another hospital. As for the quality indicators in the area of prevention, more than 90% of risk factors (smoking, asthma, cesarean delivery) were identified. Diagnostic indicators showed that 86-98% of respiratory distress symptoms were sought. Indicators of treatment achieved satisfactory figures for monitoring and support measures. Conclusions: Prevention, diagnosis and treatment indicators made it possible to consider that most TTN cases received appropriate treatment. It is advisable to develop effective strategies to prevent TTN, such as increasing efforts to reduce the increasing rates of cesarean deliveries.

Serum Enzymes in Predicting Transient Tachypnea of Newborn and Respiratory Distress Syndrome / 대한주산의학회잡지

PURPOSE: Perinatal asphyxia is a major factor correlated with diseases that cause respiratory distress in a neonate. So we aimed to investigate the relationship between respiratory distress syndrome (RDS) and transient tachypnea of newborn (TTN) with plasma biological markers of perinatal asphyxia in full-term neonates. METHODS: Full-term neonates with transient tachypnea of the newborn (TTN) and respiratory distress syndrome (RDS) who were admitted within 24 hours after birth were enrolled in a study group. And control group are infants with premature rupture of amniotic membrane without significant findings. Serum lactate dehydrogenase (LDH), aspartate transaminase (AST), alanine transaminase (ALT), creatine kinase (CK) and myoglobin were measured at admission. RESULTS: Of the total 80 infants, 54 were of the study group and 26 were of the control group. The numbers of RDS and TTN groups were 27 and 27, and the numbers of RDS with hypoxic-ischemic encephalopathy (HIE) and RDS without HIE were 6 and 21 retrospectively. Serum AST, ALT, LDH and CK were significantly higher in the study group than the control group (P<0.05). When RDS group and TTN group were compared AST and LDH were significantly higher in RDS group than TTN group (P<0.05). Serum AST, ALT and LDH were significantly higher in RDS with HIE group than RDS without HIE group (P<0.05). A prediction of RDS by LDH analysis showed good correlation by receiver operating characteristic curve (P<0.05). A cut off level of 720 IU/L for LDH was the best predictor of RDS (sensitivity 63% and specificity 86%). CONCLUSION: LDH is an excellent predictor to differentiate RDS from TTN soon after birth in full-term neonates with respiratory distress.

The Effects of Inhaled Albuterol in Transient Tachypnea of the Newborn

PURPOSE: Transient tachypnea of the newborn (TTN) is a disorder caused by the delayed clearance of fetal alveolar fluid. beta-adrenergic agonists such as albuterol (salbutamol) are known to catalyze lung fluid absorption. This study examined whether inhalational salbutamol therapy could improve clinical symptoms in TTN. Additional endpoints included the diagnostic and therapeutic efficacy of salbutamol as well as its overall safety. METHODS: From January 2010 through December 2010, we conducted a prospective study of 40 newborns hospitalized with TTN in the neonatal intensive care unit. Patients were given either inhalational salbutamol (28 patients) or placebo (12 patients), and clinical indices were compared. RESULTS: The duration of tachypnea was shorter in patients receiving inhalational salbutamol therapy, although this difference was not statistically significant. The duration of supplemental oxygen therapy and the duration of empiric antibiotic treatment were significantly shorter in the salbutamol-treated group. No adverse effects were observed in either treatment group. CONCLUSIONS: Inhalational salbutamol therapy reduced the duration of supplemental oxygen therapy and the duration of empiric antibiotic treatment, with no adverse effects. However, the time between salbutamol therapy and clinical improvement was too long to allow definitive conclusions to be drawn. Further studies examining a larger number of patients with strict control over dosage and frequency of salbutamol inhalations are necessary to better direct the treatment of TTN.

Predictable risk factors and clinical courses for prolonged transient tachypnea of the newborn / 소아과

PURPOSE: Transient tachypnea of the newborn (TTN) is usually benign and improves within 72 hours. However, it can also progress to prolonged tachypnea over 72 hours, profound hypoxemia, respiratory failure, and even death. The aim of this study is to find predictable risk factors and describe the clinical courses and outcomes of prolonged TTN (PTTN). METHODS: The medical records of 107 newborns, >35(+0) weeks of gestational age with TTN, who were admitted to the NICU at Seoul Asan Medical Center from January 2001 to September 2007 were reviewed. They were divided into 2 groups based on duration of tachypnea. PTTN was defined as tachypnea > or =72 hours of age, and simple TTN (STTN) as tachypnea 90/min, FiO2 >0.4, and required ventilator care more frequently than STTN infants. PTTN had lower level of serum total protein and albumin than STTN. The independent predictable risk factors for PTTN were grunting, maximal respiration rate >90/min, and FiO2 >0.4 within 6 hours of life. CONCLUSION: When a newborn has grunting, respiration rate >90/min, and oxygen requirement >0.4 of FiO2 within 6 hours of life, the infant is at high risk of having persistent tachypnea > or =72 hours. We need further study to find the way to reduce PTTN.

Neonatal respiratory distress: recent progress in understanding pathogenesis and treatment outcomes / 소아과

Transient tachypnea of the newborn (TTN), respiratory distress syndrome (RDS), and persistent pulmonary hypertension (PPHN) are the three most common disorders that cause respiratory distress after birth. An understanding of the pathophysiology of these disorders and the development of effective therapeutic strategies is required to control these conditions. Here, we review recent papers on the pathogenesis and treatment of neonatal respiratory disease.

Clinical Study of Transient Tachypnea of the Newborn

Transient tachypnea of the newborn(TTN) is a benign self-limited disease characterized by early onset and rapid recovery of tachypnea although it may occasionally have a more prolonged and protracted course. A retrospective clinical study was mad on 29 neonates with TTN admitted to NICU of Pohang St. Mary's Hospital from January 1992 to June 1993. The results were as follows: 1) TTN(36.2%) was the most common cause of respiratory distress in the neonate followed by idiopathic respiratory distress syndrome(23.8%), pneumonia(18.8%), meconium aspiration syndrome(6.2%), perinatal asphyxia(6.2%), polycythemia(3.8%), anemia(1.2%), persistent fetal circulation(1.2%), paroxysmal supraventricular tachycardia(1.2%) and tracheoesophageal fistula(1.2%) 2) TTN was more frequent in the male term infants but can occur in premature(41.4%) and low birth weight infants(34.5%). 3) The associated perinatal conditions were oxytocin-induction(8 cases, 27.6%), Cesarean delivery(10 cases, 34.5%) and asphyxia(7 cases, 24.2%) 4) Arterial blood gas analysis showed respiratory acidosis in 3 cases and metabolic acidosis in 3 cases but none of TTN showed hypoxia unresponsive to oxygen 5) Chest X-ray showed hyperaeration in 10 cases(34.5%), increased pulmonary vascularity in 8 cases(27.6%), hyperaeration and increased pulmonary vascularity in 6 cases(20.6%) and cardiomegaly in 12 cases(53%). 6) Tachypnea usually appeared within 6hours and abated by 48-72hours but sustained more than 73hours in 7 cases(24.1%) 7) In majority of cases, maximal respiratory rates were below 100 rates/min and administered oxygen concentrations were 20-40%, and their mean values were 81 rates/min, 37.6% respectively. 8) TTN with more prolonged course(> or=48hours) was associated with low birth weight infants, prematurity and higher respiratory rates(> or=100 breaths a minute)(p<0.05).

Clinical Study of Transient Tachypnea of the Newborn

Transient tachypnea of the newborn(TTN) is a benign self-limited disease characterized by early onset and rapid recovery of tachypnea although it may occasionally have a more prolonged and protracted course. A retrospective clinical study was mad on 29 neonates with TTN admitted to NICU of Pohang St. Mary's Hospital from January 1992 to June 1993. The results were as follows: 1) TTN(36.2%) was the most common cause of respiratory distress in the neonate followed by idiopathic respiratory distress syndrome(23.8%), pneumonia(18.8%), meconium aspiration syndrome(6.2%), perinatal asphyxia(6.2%), polycythemia(3.8%), anemia(1.2%), persistent fetal circulation(1.2%), paroxysmal supraventricular tachycardia(1.2%) and tracheoesophageal fistula(1.2%) 2) TTN was more frequent in the male term infants but can occur in premature(41.4%) and low birth weight infants(34.5%). 3) The associated perinatal conditions were oxytocin-induction(8 cases, 27.6%), Cesarean delivery(10 cases, 34.5%) and asphyxia(7 cases, 24.2%) 4) Arterial blood gas analysis showed respiratory acidosis in 3 cases and metabolic acidosis in 3 cases but none of TTN showed hypoxia unresponsive to oxygen 5) Chest X-ray showed hyperaeration in 10 cases(34.5%), increased pulmonary vascularity in 8 cases(27.6%), hyperaeration and increased pulmonary vascularity in 6 cases(20.6%) and cardiomegaly in 12 cases(53%). 6) Tachypnea usually appeared within 6hours and abated by 48-72hours but sustained more than 73hours in 7 cases(24.1%) 7) In majority of cases, maximal respiratory rates were below 100 rates/min and administered oxygen concentrations were 20-40%, and their mean values were 81 rates/min, 37.6% respectively. 8) TTN with more prolonged course(> or=48hours) was associated with low birth weight infants, prematurity and higher respiratory rates(> or=100 breaths a minute)(p<0.05).