Continuous Positive Airway Pressure Failure Research Articles

Downes Score as a Predictor of Nasal Continuous Positive Airway Pressure Failure in Neonates of 28 - 36 Weeks Gestation with Respiratory Distress: A Survival Analysis

Background: Respiratory distress is the most often encountered problem in preterm infants and the most frequently encountered reason for neonatal intensive care unit (NICU) admission. It can develop into respiratory failure and cause high morbidity and mortality. Noninvasive respiratory support, such as nasal continuous positive airway pressure (NCPAP), was the first line for neonates with respiratory distress. The progression of respiratory distress to respiratory failure in neonates with NCPAP (NCPAP failure) increases the need for mechanical ventilation on the first day of life. With limited resources, clinical observation is critical to predict prognosis and golden time for referral. Downes scores are the accurate and easiest measurement that is used to determine the severity and monitoring of respiratory distress in neonates. However, in Indonesia, there has still been no study that showed an effect of the increment of Downes score in 24 hours and the risk of NCPAP failure. Objectives: This study aimed to measure the association of Downes score at birth, ages 2, 6, 12, and 24 hours, and the risk of NCPAP failure in the first 72 hours using survival analysis. Methods: This prospective observational cohort study included all neonates with 28 - 36 weeks gestation born at Hasan Sadikin General Hospital, Bandung, Indonesia, within March to May 2019, with respiratory distress and NCPAP as respiratory support. Clinical monitoring was conducted using Downes score at birth, 2, 6, 12, and 24 hours of age. The time of NCPAP failure in the first 72 hours was also obtained. Survival analysis with Kaplan-Meier and Cox regression was used to determine the association. Results: This study analyzed 121 neonates at 72 hours with an overall survival rate of 70.2% and a mean survival time of 61.1 hours. Neonates born 28 < 32 weeks and birth weight 1000 - 1499 g had the lowest survival (54.5% and 56.9%). Downes score ≥ 4 at birth and 2 and 6 hours had lower survival than Downes score < 4 (67.7%, 60.5%, and 52.7%). The risk of NCPAP failure in 72 hours was increased with a higher Downes score at 2 hours (hazard ratio [HR] = 1.86 [95% confidence interval [CI]: 1.3 - 2.6, P < 0.001), 6 hours (HR = 1.67 [95% CI: 1.2 - 2.2], P < 0.001). Downes score ≥ 4 at 2 hours (3.26 times, P = 0.030) and 6 hours (2.44 times, P = 0.014) had a high risk of NCPAP failure in 72 hours. Conclusions: The increase in Downes score was associated with a high risk of NCPAP failure at 72 hours of age in preterm neonates with respiratory distress. Two to six hours of monitoring of the Downes score should be considered a critical time for referral.

Predicting CPAP failure after less invasive surfactant administration (LISA) in preterm infants by machine learning model on vital parameter data: a pilot study

Objective. Less invasive surfactant administration (LISA) has been introduced to preterm infants with respiratory distress syndrome on continuous positive airway pressure (CPAP) support in order to avoid intubation and mechanical ventilation. However, after this LISA procedure, a significant part of infants fails CPAP treatment (CPAP-F) and requires intubation in the first 72 h of life, which is associated with worse complication free survival chances. The aim of this study was to predict CPAP-F after LISA, based on machine learning (ML) analysis of high resolution vital parameter monitoring data surrounding the LISA procedure. Approach. Patients with a gestational age (GA) <32 weeks receiving LISA were included. Vital parameter data was obtained from a data warehouse. Physiological features (HR, RR, peripheral oxygen saturation (SpO2) and body temperature) were calculated in eight 0.5 h windows throughout a period 1.5 h before to 2.5 h after LISA. First, physiological data was analyzed to investigate differences between the CPAP-F and CPAP-Success (CPAP-S) groups. Next, the performance of two types of ML models (logistic regression: LR, support vector machine: SVM) for the prediction of CPAP-F were evaluated. Main results. Of 51 included patients, 18 (35%) had CPAP-F. Univariate analysis showed lower SpO2, temperature and heart rate variability (HRV) before and after the LISA procedure. The best performing ML model showed an area under the curve of 0.90 and 0.93 for LR and SVM respectively in the 0.5 h window directly after LISA, with GA, HRV, respiration rate and SpO2 as most important features. Excluding GA decreased performance in both models. Significance. In this pilot study we were able to predict CPAP-F with a ML model of patient monitor signals, with best performance in the first 0.5 h after LISA. Using ML to predict CPAP-F based on vital signals gains insight in (possibly modifiable) factors that are associated with LISA failure and can help to guide personalized clinical decisions in early respiratory management.

Impact of Previous Continuous Positive Airway Pressure Use on Noninvasive Ventilation Adherence and Quality in Obesity Hypoventilation Syndrome: A Pragmatic Single-Center Cross-Sectional Study in Martinique.

There is a strong relationship between obstructive sleep apnea (OSA) and obesity hypoventilation syndrome (OHS). When OHS is combined with severe OSA, treatment consists of continuous positive airway pressure (CPAP), followed by noninvasive ventilation (NIV) in the case of CPAP failure. Currently, the impact of a previous use of CPAP on the quality of NIV is unknown. We conducted a cross-sectional study with OHS patients, to assess the quality of NIV according to previous CPAP use. We included 75 patients with OHS on NIV (65 women, 87%). Among these, 40 patients (53.3%) who had had prior CPAP (CPAP+ group) were compared to the remaining 35 patients (46.7%) (CPAP- group). Key characteristics were comparable between the CPAP+ and the CPAP- groups: age at diagnosis of OHS was 67 ± 3 vs. 66 ± 4 years (p = 0.8), age at inclusion was 73 ± 15 vs. 69 ± 15 years (p = 0.29), number of comorbidities was 3.7 ± 1.2 vs. 3.3 ± 1.5, the Charlson index was 5.1 ± 2 vs. 4.6 ± 1.8, and BMI was 41.6 ± 7.6 kg/m2 vs. 41.2 ± 8.2, respectively, all p > 0.05. Follow-up length was greater in CPAP+ vs. CPAP- patients (5.6 ± 4.2 vs. 2.9 ± 2.9 years, p = 0.001). The quality of NIV based on daily adherence, pressure support, apnea-hypopnea index (AHI) and leaks was similar in both groups. Reduced adherence (less than 4 h daily) was found in 10 CPAP+ patients (25%) versus 7 CPAP- patients (20%), p = 0.80. NIV efficacy was also similar. This study found no difference in the quality of NIV or in adherence between patients who had had prior CPAP and those who had not. Previous CPAP does not appear to improve the quality of NIV.

The effect of velar collapse patterns on unilateral upper airway stimulation therapy.

Hypoglossal nerve stimulation is a promising alternative therapy for patients with obstructive sleep apnea with continuous positive airway pressure intolerance or failure. Previous studies concluded that a velar complete concentric collapse might prohibit a good therapeutic outcome. However, certain patients have an upper velar anteroposterior collapse and a lower velar complete concentric collapse. The effect of this velar collapse pattern is unknown, preventing evidence-based decision-making for these patients. This study aimed to compare the results of upper airway stimulation therapy in these patients to patients with a pure anteroposterior velar collapse. A retrospective single-center cohort study was performed. Patients were included who were implanted with an upper airway stimulation device and had a 1-year follow-up. Of 66 patients, 10 had an upper velar anteroposterior collapse and lower velar complete concentric collapse. Fifty-six patients had a complete or partial velar anteroposterior collapse. At follow-up, all respiratory outcomes were similarly changed between the two groups. The mean apnea and hypopnea index reduced equally (26.9 events/hour vs. 23.9 events/hour, 95% CI (-5.0, 11.0), p = 0.46). A similar decrease in the oxygen desaturation index of ≥ 4% was observed (12.0/hour versus 11.5/hour, 95% CI (-8.7, 9.7) p = 0.92) CONCLUSION: Patients with an upper velar anteroposterior collapse and a lower velar complete concentric collapse are suitable candidates for upper airway stimulation therapy. In these patients, the lower velum may represent a transition zone between the anteroposterior collapse of the upper velum and the lateral collapse of the oropharynx, instead of being a real concentric collapse.

Early factors associated with continuous positive airway pressure failure in moderate and late preterm infants

To determine the early factors associated with continuous positive airway pressure (CPAP) failure in moderate-to-late preterm infants (32 + 0/7 to 36 + 6/7 weeks’ gestation) from the NEOBS cohort study. The NEOBS study was a multi-center, prospective, observational study in 46 neonatal intensive care units in France, which included preterm and late preterm infants with early neonatal respiratory distress. This analysis included a subset of the NEOBS population who had respiratory distress and required ventilatory support with CPAP within the first 24 h of life. CPAP failure was defined as the need for tracheal intubation within 72 h of CPAP initiation. Maternal and neonatal clinical parameters in the delivery room and clinical data at 3 h of life were analyzed. CPAP failure occurred in 45/375 infants (12%), and compared with infants with CPAP success, they were mostly singletons (82.2% vs. 62.1%; p < 0.01), had a lower Apgar score at 10 min of life (9.1 ± 1.3 vs. 9.6 ± 0.8; p = 0.02), and required a higher fraction of inspired oxygen (FiO2; 34.4 ± 15.9% vs. 22.8 ± 4.1%; p < 0.0001) and a higher FiO2*positive end-expiratory pressure (PEEP) (1.8 ± 0.9 vs. 1.1 ± 0.3; p < 0.0001) at 3 h. FiO2 value of 0.23 (R2 = 0.73) and FiO2*PEEP of 1.50 (R2 = 0.75) best predicted CPAP failure. The risk of respiratory distress and early CPAP failure decreased 0.7 times per 1-week increase in gestational age and increased 1.7 times with every one-point decrease in Apgar score at 10 min and 19 times with FiO2*PEEP > 1.50 (vs. ≤ 1.50) at 3 h (R2 of the overall model = 0.83).  Conclusion: In moderate-to-late preterm infants, the combination of singleton pregnancy, lower Apgar score at 10 min, and FiO2*PEEP > 1.50 at 3 h can predict early CPAP failure with increased accuracy.What is Known:•Respiratory distress syndrome (RSD) represents an unmet medical need in moderate-to-late preterm births and is commonly treated with continuous positive airway pressure (CPAP) to reduce mortality and the need for additional ventilatory support.• Optimal management of RSD is yet to be established, with several studies suggesting that identification of predictive factors for CPAP failure can aid in the prompt treatment of infants likely to experience this failure.What is New:•Secondary analysis of the observational NEOBS study indicated that oxygen requirements during CPAP therapy, especially the product of fraction of inspired oxygen (FiO2) and positive end-expiratory pressure (PEEP), are important factors associated with early CPAP failure in moderate-to-late term preterm infants.•The combination of a singleton pregnancy, low Apgar score at 10 minutes, and high FiO2*PEEP at 3 hours can predict early CPAP failure with increased accuracy, highlighting important areas for future research into the prevention of CPAP failure.

Sonographic assessment of diaphragmatic thickness and excursion to predict CPAP failure in neonates below 34 weeks of gestation: A prospective cohort study.

To evaluate the diagnostic accuracy of sonographic assessment of diaphragmatic dimensions and excursions in predicting Continuous Positive Airway Pressure (CPAP) failure in preterm neonates with respiratory distress. Prospective cohort study among preterm neonates less than 34 weeks of gestation who were hemodynamically stable and either admitted with respiratory distress or who developed respiratory distress shortly after admission to the NICU and having Silverman-Anderson Score (SAS) ≥ 3/10 were included. We performed sonographic assessment of diaphragmatic dimensions and excursions before and one hour ±30 minutes after application of CPAP. 'CPAP failure' was defined as combined outcome of the need of surfactant and/or upgradation of respiratory support within first 72 hours after a trial of CPAP. Clinical parameters and diaphragmatic measurements were compared between CPAP failure and success groups. Of 62 participants, 20 (32%) failed CPAP. On binomial logistic regression (after adjustment for gestational age and birth weight), initial SAS, higher diaphragmatic excursion (both left and right, before and after CPAP application), lower left hemidiaphragm diaphragmatic thickness fraction (DTF) (before CPAP application) and lower right DTF (after CPAP application) were independent predictors of CPAP failure. However, the receiver-operating characteristics curves showed that excursions of right and left hemi-diaphragm both before and after CPAP application, had highest accuracies in predicting CPAP failure (AUC 0.84, 0.80 and 0.86, 0.78, respectively; p < .001). Diaphragmatic excursion can be a useful parameter to predict the failure of CPAP in preterm neonates with respiratory distress.

Risk factors of preterm infants with CPAP intubated for mechanical ventilation

Early use of continuous positive airway pressure (CPAP) is equal to the prophylactic administration of a surfactant to prevent neonatal respiratory distress syndrome (nRDS) in high-risk infants. However, almost half of the smallest infants still require intubation and mechanical ventilation in the first 72 hours after birth. It is known that ineffective initial CPAP is associated with a poorer prognosis. Therefore, the search for reliable prognostic risk factors for ineffective CPAP in very preterm neonates whose respiratory support is started with CPAP is still relevant today. The results of a retrospective cohort study conducted at the Lviv Regional Clinical Hospital (Ukraine), which included 151 children with birth weight &lt;1500 g and gestational age &lt;32 weeks, showed that CPAP failure occurred at a median age of five hours in 31% of infants initially treated with CPAP and average (SD) FiO2, while the failure point was 0.48 (0.15). The prevalence of the main risk factors for severe nRDS did not differ significantly between two groups (CPAP success and CPAP failure). The risk of CPAP failure was significantly associated with surfactant treatment (OR – 7.46; 95% CI: 2.3–24.2), severe RDS (OR – 12.17; 95% CI: 3.8–39.3), requirement in resuscitation after birth (OR – 3.10; 95% CI: 1.2–8.1), initial CPAP pressure (OR – 0.38; 95% CI: 0.15–0.99). Earlier administration of exogenous surfactant to children at high risk of developing severe RDS could prevent the need for mechanical ventilation. Keywords: CPAP failure, neonatal respiratory distress syndrome mechanical ventilation, preterm infants, surfactant

Evaluation of Diagnostic Accuracy of HACOR Score in Predicting the Success Rate of CPAP in Patients with COVID-19-Induced Hypoxemia

Background: In coronavirus disease 2019 (COVID-19)-associated hypoxemic acute respiratory failure (ARF) may require continuous positive airway pressure (CPAP), and having an appropriate criterion for early diagnosis and prediction of CPAP failure or success can significantly reduce the mortality of these patients. Objectives: This study was conducted to evaluate the diagnostic accuracy of heart rate, acidosis, consciousness, oxygenation, and respiratory rate (HACOR) score in predicting the success rate of CPAP in patients with COVID-19 induced hypoxemia. Methods: This retrospective cross-sectional study was conducted on 200 adult patients aged 63.23 ± 16.23 years with mild to moderate acute respiratory failure (COVID-19), partial pressure of oxygen in arterial blood (PaO2) &lt; 300 mmHg, and partial pressure of carbon dioxide in arterial blood (PaCO2) &lt; 45 mmHg from March 21 to November 21, 2021. The patients were admitted to the respiratory intensive care unit (RICU) of Khatam Al-Anbia (PBUH) Hospital in Shoushtar (southwestern Iran) and were subjected to CPAP for respiratory support. The HACOR score was calculated one hour after the CPAP onset. Data were analyzed by SPSS software (version 22) using Kolmogorov-Smirnov, t-test, pair t-tests, receiver operating characteristic (ROC) curve, sensitivity, specificity, and predictive value indices were used to determine the diagnostic performance of the method. The significance level was set at P ≤ 0.05. Results: The mean HACOR score one hour after the onset of CPAP was 3.50 ± 1.57 (P &lt; 0.001), with a mean of 153.84 ± 27.42 mmHg PaO2/fraction of inspired oxygen (FiO2) ratio (P &lt; 0.001). The cut-off point for the HACOR score one hour after CPAP was 5, which had a sensitivity of 98.06% (94.45% - 99.60%) and a specificity of 83.33% (68.64% - 93.03%). Out of 200 patients, 157 patients (78.5%) had CPAP failure, and 43 patients (21.5%) underwent treatment. The diagnostic accuracy values of the HACOR score and PaO2/FiO2 ratio for predicting CPAP failure were 94.92% and 95.96%, respectively. Conclusions: Our findings support that although the HACOR score had a good diagnostic performance in predicting the success rate of CPAP in patients with COVID-19-induced hypoxemia, PaO2/FiO2 ratio was also shown to be a good predictor of success.

Evaluation of PaCO&lt;sub&gt;2&lt;/sub&gt; trend in COVID-19 patients undergoing helmet CPAP in the emergency department

The use of continuous positive airway pressure (CPAP) in COVID-19 hypoxemic respiratory failure (h-ARF) under a strict protocol has been described to be highly efficient. However, early prediction of failure is crucial to avoid delayed intubation. Lower PaCO2 values may represent a higher inspiratory effort and, therefore, may help identify patients at greatest risk of CPAP failure. Aim of this study was to observe the PaCO2 trend of COVID-19 patients with h-ARF before and after the initial treatment with helmet-CPAP. A case series study was conducted from November 2020 to March 2021. All adult patients with h-ARF secondary to COVID-19 treated with helmet-CPAP and eligible for endotracheal intubation were observed. Of a total of 54 patients, 32 (59.3%) underwent intubation. Seven (12.9%) patients died in the ETI group, and none in the non-ETI group. Median PaO2/FiO2 ratio on admission was 91mmHg [IQR 68-185] vs. 104mmHg [IQR 85-215] (p=0.137) in the ETI e non-ETI group, respectively. No differences were found either for PaCO2 values on admission (31.5mmHg [IQR 27-35] vs. 29.3mmHg [IQR 27.7-40]) and for PaCO2 variations after 120 minutes of CPAP (+2.38mmHg ± 3.65 vs. +2.73mmHg ± 3.96). Changes in PaCO2 values were observed during an initial helmet-CPAP trial, but no differences were found in those undergoing endotracheal intubation as compared to the others.

The Use of the "Respiratory Rate Oxygenation (ROX) Index" in the Assessment of Respiratory Support and Observation of Its Outcome in COVID-19 Patients With Acute Respiratory Failure.

COVID-19 infection caused by the SARS-Cov-2 virus may result in severe acute respiratory failure and require respiratory support in the ICU. The present study was designed to evaluate the role of the respiratory rate oxygenation (ROX) index in the assessment of the adequacy of non-invasive respiratory support the COVID-19 patients with acute respiratory failure and observe its outcome. This cross-sectional, observational study was conducted between October 2020 and September 2021 in the Department of Anaesthesia, Analgesia, and Intensive Care Medicine of Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh. A total of 44 patients with a confirmed diagnosis of COVID-19 with acute respiratory failure were enrolled in this study based on inclusion and exclusion criteria. Informed written consent was taken from the patient/patient's guardian. Each patient underwent detailed history taking through physical examination and relevant investigations.All necessary information were recorded in a separate case record form. All the patients receiving high-flow nasal cannula (HFNC) were assessed at two hours, six hours, and 12 hours for variables of the ROX Index. The team of respective physicians was applied responsibly for determining HFNC failure to discontinue or deescalate respiratory support as a part of continuous positive airway pressure (CPAP) ventilation success. Each selected patient was observed for the duration of different types of respiratory support. CPAP failure or success, progression to mechanical ventilation, and data were collected from individual medical records. The patients who were successfully weaned from CPAP were recorded. The diagnostic accuracy of the ROX index was determined. The mean age of the patients was 65±8.80 years with a majority in the age group 61-70 years (36.4%). A male predominance was observed with 79.5% male and 20.5% female. Of all, HFNC failure was observed in 29.5% of patients. Oxygen saturation (SpO2), respiratory rate (RR), and ROX index were statistically worse at the sixthand 12th hour of initiation of HFNC (P<0.05). At a cut-off value of 3.90, the ROC curve showed 90.3% sensitivity and 76.9% specificity in predicting HFNC success (the area under the curve (AUC) was 0.909). Similarly, 46.2% of patients had CPAP failure. SpO2, RR, and ROX index were found statistically worse among those patients at the sixth and 12th hour of CPAP therapy (P<0.05). The ROC curve showed 85.7% sensitivity and 83.3% specificity at a cut-off value of 2.64 in predicting CPAP success (the AUC was 0.881). The ROX index's clinical score form, which does not require lab findings or sophisticated computation techniques, is its key benefit. The study findings recommend the use of the ROX index to predict the outcome of respiratory support in acute respiratory failure in COVID-19 patients.

Average Volume-assured Pressure Support as Rescue Therapy after CPAP Failure in Pediatric Obstructive Sleep Apnea: A Retrospective Case Series Study.

Continuous positive airway pressure (CPAP) is frequently prescribed for patients with residual obstructive sleep apnea (OSA) following adenotonsillectomy. The goal was to examine the efficacy of noninvasive ventilation with average volume-assured pressure support (AVAPS) as a potential option for children with failed CPAP titration. In a single-center retrospective study, we included children aged 1-17 years, with polysomnographically confirmed OSA who underwent AVAPS titration following failed CPAP titration. In addition to describing the clinical characteristics of the included patients, we compared polysomnographic parameters before and after AVAPS. Nine patients met the inclusion criteria; out of them, 8 (89%) were males with an age range of 6.7 ± 3.9 years and a body mass index percentile of 81.0 ± 28.9. Reasons for failed CPAP titration were: 3 (33%) patients due to inability to control apnea-hypopnea index (AHI), 3 (33%) patients due to sleep-related hypoventilation, 2 (22%) patients due to treatment-emergent central sleep apnea, and 1 (11%) patient due to intolerance to CPAP. AVAPS resulted in a greater reduction in AHI than CPAP (reduction following CPAP = 24.6 ± 29.3, reduction following AVAPS = 42.5 ± 37.6, p = 0.008). All patients had resolution of the problems which caused CPAP failure. In this case a series of children with OSA and with failed CPAP titration, AVAPS resulted in a greater reduction in AHI compared with CPAP as well as resolution of the problems which caused CPAP failure.

CPAP failure in the management of preterm neonates with respiratory distress syndrome where surfactant is scarce. A prospective observational study

BackgroundThe mainstay in the management of preterm neonates with respiratory distress syndrome (RDS) include early Continuous Positive Airway Pressure (CPAP), timely surfactant replacement and mechanical ventilation. Preterm neonates with RDS who fail CPAP are at higher risk for chronic lung disease as well as death. Unfortunately, in low resource settings CPAP may be the only treatment available for these neonates.ObjectiveTo determine the prevalence of CPAP failure among premature newborns with RDS and associated factors.MethodsWe conducted a prospective observational study over the first 72 h of life on 174 preterm newborns with RDS receiving CPAP at Muhimbili National Hospital (MNH). At MNH newborns with Silverman Andersen Score (SAS) of ≥ 3 are commenced on CPAP; surfactant and mechanical ventilation are very scarce. Study newborns not maintaining oxygen saturation > 90% or with SAS score ≥ 6 despite being on 50% oxygen and PEEP of 6 cmH2O and those with > 2 episodes of apnoea needing stimulation or positive pressure ventilation in 24 h were considered as CPAP failure. The prevalence of CPAP failure was determined as a percentage and factors associated were determined by logistic regression. A p-value of < 0.05 was considered significant and 95% confidence interval was used.ResultsOf the enrolled newborns, 48% were male and 91.4% were in-born. The mean gestational age and weight were 29 weeks (range 24–34 weeks) and 1157.7 g (range 800–1500 g) respectively. Of the mothers 44 (25%) received antenatal corticosteroids. Overall CPAP failure was 37.4% and among those weighing ≤ 1200g, it was 44.1% . Most failure occurred within the first 24 h. No factor was identified to be independently associated with CPAP failure. Mortality among those who failed CPAP was 33.8% and 12.8% among those who did not.ConclusionsIn resource limited settings like ours with low up take of antenatal corticosteroids and scarce surfactant replacement a significant portion of preterm neonates especially those weighing ≤ 1200 g with RDS fail CPAP therapy.

Nasal intermittent positive pressure ventilation as a rescue therapy after nasal continuous positive airway pressure failure in infants with respiratory distress syndrome.

Evaluate whether nasal intermittent positive-pressure ventilation (NIPPV) as rescue therapy after initial nasal continuous positive airway (NCPAP) failure reduces need for invasive mechanical ventilation (IMV) in infants with respiratory distress syndrome (RDS). Retrospective cohort involving 156 preterm infants who failed initial NCPAP and were then submitted to NIPPV rescue therapy and classified into NIPPV success or failure, according to need for IMV. Of all infants included, 85 (54.5%) were successfully rescued with NIPPV while 71 (45.5%) failed. The NIPPV success group had significantly lower rates of bronchopulmonary dysplasia, peri/intraventricular hemorrhage, patent ductus arteriosus and greater survival without morbidities (all p ≤ 0.01). Infants who failed NIPPV had earlier initial NCPAP failure (p = 0.09). In final logistic regression model, birthweight ≤1000 g and need for surfactant remained significant factors for NIPPV failure. NIPPV rescue therapy reduced the need for IMV in infants that failed NCPAP and was associated with better outcomes.

[Adherence to CPAP Three Months after Starting Therapy in 1078 Patients with Obstructive Sleep Apnea (OSA)].

Nocturnal Continuous Positive Airway Pressure (CPAP) is considered the gold standard treatment for obstructive sleep apnoea (OSA). The CPAP therapy is a long-term treatment but does come with few possible side effects. The adherence to the therapy is frequently suboptimal. In this paper, adherence to therapy was assessed and typical problems were classified. 1078 OSA patients received CPAP therapy after a diagnostic polygraphy (PG) or polysomnography (PSG). Adherence to therapy was followed up three months after treatment induction. The following therapy adherence groups were defined: 1. correctly calibrated CPAP and good adherence, 2. CPAP non-acceptance, after initial use, 3. CPAP intolerance use due to side effects, 4. discontinuation due to lack of motivation/low rates of symptoms. 5. mask intolerance, 6. CPAP failure due to a lack of perceived treatment effect, 7. Change to another non-invasive ventilation method, 8. No control carried out. Out of 1078 OSA patients a therapy control was performed in 830 patients (77%). Of these, 450 patients (54.2%) were placed in group 1, 216 patients (26 %) in group 2, 71 patients (8.5 %) in group 3, 35 patients (4.2 %) in group 4, 14 patients (1.7 %) in group 5, 3 patients (0.4 %) in group 6 and 41 patients (4.9%) in group 7. A mild obstructive index, low CPAP pressure and, as a trend, a low Epworth-Sleepiness score were predictors of CPAP failure. No significant predictors could be shown for adherence to therapy. An effective treatment use of 54% after 3 months is a suboptimal result. Predictors of CPAP failure were parameters that indicated that the patient was less symptomatic prior to therapy. Despite a large patient cohort, neither anthropometric nor PSG-data provided any significant CPAP adherence predictors. Rather, experiences in the first nights of use could be decisive. CPAP devices offer comfort settings that have to be personalised to patients' needs and wants. A large selection of different mask shapes requires experience and training in patient-centred mask fitting. A three-month follow-up appointment seems too long to discuss therapy problems with the patient in a timely manner. Telemedical options or short-term telephone appointments should be considered.

CORRELATION BETWEEN INITIAL PRESSURE AND DURATION ON BUBBLE CPAP IN NEONATES WITH RESPIRATORY DISTRESS ADMITTED IN NEONATAL INTENSIVE CARE UNIT IN A TERTIARY CARE CENTRE

Background: Continuous Positive airway pressure (CPAP) is a non-invasive form of respiratory support, which is safe and effective in neonates with respiratory distress. The purpose of this study is to predict the length of stay on bubble CPAP in neonates by correlating the initial pressure and duration on it with respect to gestational age, birth weight and respiratory distress scores. Objective: To correlate the initial pressure and duration on bubble CPAP in neonates with respiratory distress thereby predicting the length of stay on it and analyzing the factors responsible for bubble CPAP failure. Materials and Methods: A prospective longitudinal study was conducted over a period of 2 years in neonates with respiratory distress requiring bubble CPAP. Applying Pearsoncoefficient, the initial pressure and duration on bubble CPAP was correlated with respect to different variables. The statistical analysis was performed using SPSS (Version 20.0). P value of &lt;0.05 was considered as statistically significant. Results: Out of 246 neonates enrolled, 211(85.77%) neonates were successfully treated with bubble CPAP, with mean birth weight of 1.66 kg and mean duration of stay on bubble CPAP was 32.64 hours. Applying Pearson co- efficient on initial pressure and duration on bubble CPAP there was negative correlation, which was statistically significant. 35(14.23%) failed bubble CPAP. The predictors of failure were prematurity (51.43%), birth asphyxia (8.6%), age at initiation of bubble CPAP, sepsis (8.57%), Downes score and Silverman Anderson score of more than 6. Other maternal and neonatal variables did not influence the need of mechanical ventilation. Conclusion: The duration of stay on bubble CPAP and the initial pressure set are negatively correlated that is, higher the initial pressure there is significant reduction in duration on bubble CPAP thereby the length of stay can be predicted by initial pressure set.

Fraction of Inspired Oxygen as a Predictor of CPAP Failure in preterms with Respiratory Distress Syndrome

Background: Respiratory distress syndrome (RDS) is one of the most common causes of NICU admission and neonatal death. It is mainly found in premature infants, the risk of developing into RDS increased with decreasing of gestational age and birth weight. Continuous positive airway pressure (CPAP) is a simple, non-invasive, and cost-effective therapy, particularly for preterm neonates with respiratory distress syndrome (RDS). It decreases the need for mechanical ventilation as well as the risks of mortality and bronchopulmonary dysplasia (BPD). The main aim of this study was to assess fraction of Inspired Oxygen as a Predictor of CPAP Failure in preterm with respiratory distress syndrome. Methods: This study enrolled on infant with Respiatroy distress on CPAP.

Short-Term Outcome after Repeated Less Invasive Surfactant Administration: A Retrospective Cohort Study

Introduction: Less invasive surfactant administration (LISA) to preterm infants is associated with decreased risk for death or BPD. After LISA, a considerable proportion requires a second dose of surfactant because of ongoing respiratory distress syndrome, raising a clinical dilemma between intubation or performing a repeated LISA (re-LISA) procedure. We aim to assess efficacy of re-LISA in avoiding subsequent nasal continuous positive airway pressure failure (need for intubation in the first 72 h of life; CPAP-F), to identify factors associated with subsequent CPAP-F, and to compare short-term outcomes following re-LISA to surfactant retreatment by endotracheal intubation and mechanical ventilation. Methods: This was an observational retrospective study in two Dutch NICUs. Inclusion criterion was infants with gestational age <32 0/7 weeks requiring a second surfactant dose. Multivariate logistic regression analysis was performed. Results: Of 209 infants requiring second surfactant dose, 132 received re-LISA. Subsequent CPAP-F was observed in 56 (42%) infants and was associated with extreme prematurity (OR 2.6, 95% CI: 1.2–5.8) and FiO₂>0.5 (OR 5.4, 95% CI: 2.0–14.7). Infants receiving re-LISA had a lower risk of death or BPD compared to infants intubated for the second surfactant dose (OR 0.4, 95% CI: 0.2–0.9). Infants with CPAP-F after re-LISA had similar outcomes compared to those intubated for second surfactant dose. Conclusion: Re-LISA is effective in reducing CPAP-F and is associated with lower risk of death or BPD compared to retreatment via an endotracheal tube. Infants failing CPAP after re-LISA have similar outcomes compared to intubated infants. These findings support the use of re-LISA in preterm infants with ongoing RDS.

Dynamics of Circulating CD14/CD16 Monocyte Subsets in Obstructive Sleep Apnea Syndrome Patients upon Hypoglossal Nerve Stimulation.

Background: Obstructive sleep apnea syndrome (OSAS) is a widespread respiratory disease that is associated with recurrent breathing intermissions at night. The corresponding oxidative stress triggers a low-grade systemic inflammation which leads to alterations of different immune cells in the peripheral blood. The current standard treatment for OSAS is continuous positive airway pressure (CPAP), whereas hypoglossal nerve stimulation (HNS) has been established as a second-line treatment option for CPAP failure. The aim of the study was to investigate the influence of HNS for OSAS patients on the distribution and differentiation of circulating monocyte subsets in connection with the clinical parameters. Materials and Methods: Therefore, a detailed analysis of the distribution of CD14/CD16 characterized monocyte subsets in the peripheral blood of OSAS patients before and after HNS therapy was performed by flow cytometry. Furthermore, values of BMI (body mass index), ODI (oxygen desaturation index), and ESS (Epworth Sleepiness Scale) were measured. Results: These OSAS patients significantly improved AHI and ESS scores under HNS. In addition, HNS revealed the potential to ensure normal distributions of blood monocyte subsets and even improved the monocyte dynamics in selected OSAS patients, but there were no significant correlations with AHI, ODI, HNS usage, and daytime sleepiness. Conclusions: We conclude that HNS-related positive effects on the oxygenation of the peripheral blood as well as affect the distribution of circulating monocyte subsets, but clinical OSAS correlations are missing. Far more individual clinical, cellular and molecular factors are involved in this sensitive and complex regulatory network and have to be elucidated in further studies.

Upper Airway Stimulation in Patients with Obstructive Sleep Apnea: Long-Term Surgical Success, Respiratory Outcomes, and Patient Experience.

Introduction  Upper airway stimulation (UAS) with electric activation of the hypoglossal nerve has emerged as a promising treatment for patients with moderate-to-severe obstructive sleep apnea. Objective  To retrospectively analyze objective and subjective outcome measures after long-term follow-up in obstructive sleep apnea patients receiving upper airway stimulation. Methods  An observational retrospective single-center cohort study including a consecutive series of patients diagnosed with obstructive sleep apnea receiving upper airway stimulation. Results  Twenty-five patients were included. The total median apnea-hypopnea index (AHI) significantly decreased from 37.4 to 8.7 events per hour at the 12-month follow-up ( p  < 0.001). The surgical success rate was 96%. Adverse events were reported by 28% of the patients. Conclusion  Upper airway stimulation is an effective and safe treatment for obstructive sleep apnea in patients with continuous positive airway pressure (CPAP) failure or intolerance. However, it is possible that the existing in and exclusion criteria for UAS therapy in the Netherlands have positively influenced our results.

Study of Efficacy and Outcome of Nasal Cpap in Preterm Neonates with Hyaline Membrane Disease

Background: In the quest to bring down the neonatal mortality rate, the challenge is to develop low cost technology thatcan be used in remote settings. It is known that early use of continuous positive airway pressure (CPAP) reduces theincidence of respiratory distress and it may be used as an alternative to intubation and ventilation is some casesObjectives: To study the efficacy and outcome of Nasal CPAP in preterm neonates with Hyaline membrane disease.Methods: 50 preterm newborns with respiratory distress (Silverman"s score 3-6) admitted in NICU were included in thestudy. All study population were connected to CPAP variables like gestational age, birth weight, antenatal steroids,Downes Score, Age of start of CPAP, initial FiO2, initial PEEP , max FiO2, max PEEP, duration of CPAP, duration of O2administration, acute complications like sepsis, pneumothorax, septal damage and duration of hospital stay are comparedbetween CPAP success and CPAP failure groups.Results: Preterm New-borns between 31-34 wks of gestational age had a success of 96.5% as compared to gestationalage of 28-30 wks had success of 76.1% and p value 0.02. Preterm New-borns with birth weight &gt; 1000 gms had success of89% when compared to &lt;1000gms had success rate of 50% which is statistically significant. Preterms New-borns born tomothers who received antenatal steroids had better outcome (CPAP success rate of (87.7%) as compared to babies born tomothers who had not received antenatal steroidsConclusion: Early use of bubble CPAP is associated with lesser need for mechanical ventilation as well as reducedhospital stay. Bubble CPAP in pre-term neonates is efficient in decreasing respiratory distress, and associated with lessercomplications as well as mortality rate.