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BackgroundA collaboration between the University of Michigan (UM) Cystic Fibrosis Center (CFC) and Marmara University (MU) CFC was initiated in MU through conducting Quality Improvement projects (QIP). The global aim was to improve nutritional status of children with CF (cwCF), with a specific aim to increase the mean BMI percentile (BMIp) for cwCF by 10 percentile points in 12 months. MethodsBody mass index (BMI) percentiles of cwCF were categorized as: nutritionally adequate (BMIp >= 50%); at risk (BMIp 25%-49%); urgently at risk (BMIp 10%-25%); critically at risk (BMIp < 10%). Appropriate interventions were made according to BMIp category every three months. Forced expiratory volume in one-second percent predicted (FEV1pp), and health-related quality of life (HRQoL) were evaluated. ResultsOne hundred and eight-two cwCF with a mean age of 9.1 +/- 4.3 years were included in the project. Baseline BMIp increased from 25.6 to 37.2 at the 12th month (p < 0.001). In the critically at-risk group BMIp increased from 3.6 to 20.5 (p < 0.001), in the urgently at risk group from 15.9 to 30.8 (p < 0.001), in the at risk group from 37.0 to 44.2 (p < 0.079) and in the nutritionally adequate group the increase was from 66.8 to 69.5 (p < 0.301). FEV1pp also improved significantly, from 81.3 +/- 20.6 to 85.9 +/- 20.8 (p < 0.001). Physical functioning, eating problems, and respiratory symptoms domains of the HRQoL evaluation improved (p < 0.05). ConclusionThis project has led to significant improvements in BMIp, FEV1pp and HRQoL of cwCF; similar projects could easily be implemented by centers in other developing countries.

Advances in technology in recent years increased the long-term survival rate of patients with chronic respiratory failure. As a result, the number of patients receiving long-term home mechanical ventilation (LTHV) support is increasing worldwide. The most important step in the management of patients with home mechanical ventilation (HMV) is to ensure adequate oxygenation and ventilation. Successful care at home requires the presence of trained caregivers and accessibility to medical devices and a care team. The aims of this study were, to describe the characteristics of children on LTHV in Istanbul, to compare the patients receiving non-invasive ventilation (NIV) and invasive ventilation, and to evaluate the frequency and risk factors of hospital admission in this population.

Background: A collaboration between the University of Michigan (U of M) Cystic Fibrosis Center (CFC) and Marmara University (MU) CFC was initiated to improve the health status of people with cystic fibrosis (pwCF) at MU through implementing Quality Improvement (QI) initiatives. The main aim was to improve lung function in children with FEV1pp

BackgroundThe aim of this study was to evaluate the prevalence of anxiety, depression, sleep, and associated factors in caregivers of children with spinal muscular atrophy (SMA). Materials and MethodsBeck Depression Inventory (BDI), the State-Trait Anxiety Inventory-State (STAI-S), the State-Trait Anxiety Inventory-Trait (STAI-T), and Pittsburgh Sleep Quality Index (PSQI) were used to assess the anxiety, depression, and sleep quality of the caregivers of children with SMA. Higher scores indicated worse outcome for all three questionnaires. ResultsFifty-six caregivers of children with SMA were included in the study. Median age of children was 6 (3.2-10) years and mean age of the caregivers was 37.0 +/- 6.5 years. Median scores of the BDI, STAI-S, STAI-T, and PSQI were 12 (7.2-17), 35.5 (31-44), 40.5 (35-48), and 7.0 (5.0-10.0), respectively. There was a positive correlation between BDI and PSQI scores (p < 0.05). There was a negative correlation between the age of the caregivers and PSQI, BDI, STAI-T scores (p = 0.01, r = -0.341; p = 0.006, r = -0.364; p = 0.003, r = -0.395, respectively). There was a negative correlation between the age of the patients and the PSQI scores of the caregivers (p = 0.01, r = -0.33). There was a negative correlation between BDI scores and household income (p = 0.01, r = -0.34). ConclusionCaregivers of children with SMA had elevated depression and anxiety levels and they also had decreased sleep quality. Economic and social support resources are needed to help caregivers of those children.

Introduction Flexible bronchoscopy (FB) is frequently used for assessment and treatment of patients with respiratory diseases. Our aim was to investigate the contribution of FB to diagnosis and therapy in children admitted to the intensive care units (ICU) and to evaluate the safety of FB in this vulnerable population. Methods Children less than 18 years of age who underwent FB in the five neonatal and pediatric ICUs in Istanbul between July 1st, 2015 and July 1st, 2020 were included to the study. Demographic and clinical data including bronchoscopy indications, findings, complications, and the contribution of bronchoscopy to the management were retrospectively reviewed. Results One hundred and ninety-six patients were included to the study. The median age was 5 months (range 0.3-205 months). The most common indication of FB was extubation failure (38.3%), followed by suspected airway disease. Bronchoscopic assessments revealed at least one abnormality in 90.8% patients. The most common findings were airway malacia and the presence of excessive airway secretions (47.4% and 35.7%, respectively). Positive contribution of FB was identified in 87.2% of the patients. FB had greater than 1 positive contribution in 138 patients and 80.6% of the patients received a new diagnosis. Medical therapy was modified after the procedure in 39.8% and surgical interventions were pursued in 40% of the patients. Therapeutic lavage was achieved in 18.9%. There were no major complications. Conclusion Flexible bronchoscopy is a valuable diagnostic and therapeutic tool in neonatal and pediatric ICUs and is not associated with major complications.

BACKGROUND: Cystic fibrosis (CF) is a chronic disease causing recurrent respiratory tract infections. Viral respiratory tract infections are more severe in CF. The first case of COVID-19 was seen in our country on March 11, 2020 and nationwide school closure and lockdown were implemented. School closure and home confinement might have adverse effects on children's physical and mental health. In this study, we aimed to compare the effect of COVID-19 pandemic on psychological reactions of CF patients and healthy controls. METHODS: This is a controlled cross-sectional study including 7-18 year-old children with CF. The survey included questions regarding family environment and peer relations, self care and psychological reactions to COVID-19 pandemic. The questionnaire was applied to children via telephone call under parental supervision. RESULTS: We evaluated 132 CF patients and 135 their healthy peers. Mean age was 11.5±2.9 years in CF group and 11.8±3.2 years in control group (p=0.98). There were 55 girls (41.7%) in CF group and 81 girls (60%) in control group (p=0.027). The socioeconomic status of families was similar. CF patients were found to be less anxious for family members having the risk of COVID-19, less upset for school closure, less anxious about the COVID-19 pandemic (p

Respiratory failure is the leading cause of mortality in spinal muscular atrophy type 1 (SMA1) children. The current study aims to evaluate the effect of nusinersen treatment on respiratory outcome of the patients with SMA1.In this retrospective, single-center study, 52 SMA1 patients treated with nusinersen were included in the analysis. Patients were divided into two groups based on their age at the time of their first nusinersen treatment (Group 1: ≤6 months, Group 2:6 months). Respiratory outcome on the 180th day of treatment is defined as the type of ventilation support (spontaneous breathing, noninvasive ventilation (NIV), and tracheostomized or intubated on invasive mechanical ventilation). Demographic data, respiratory outcome, and Children's Hospital of Philadelphia Infant Test of Neuromuscular Disorders scores were obtained from medical records.On the 180th day of treatment, 46 of the 52 (88.4%) children were alive. Prevalence of the mortality was similar in both groups (P = 0.65). The comparison of respiratory outcome in patients between group 1 and group 2 was as follows: spontaneous breathing, 7 (43.7%) versus 4 (13.3%) (P = 0.03); NIV16 h/day, 3 (18.7%) versus 4 (13.3%) (P = 0.68); invasive mechanical ventilation, 6 (37.5%) versus 22 (73.3%) (P = 0.01). There were no patients using NIV ≥16 h/day. There were significant improvements in Children's Hospital of Philadelphia Infant Test of Neuromuscular Disorders scores of the patients at day 180 in comparison with the baseline (P 0.001).Early initiation of nusinersen treatment in SMA1 patients may alter the disease's natural course.

Introduction Tracheostomy care in children may be challenging, due to lack of knowledge of healthcare providers (HCPs). The aim of this study was to determine the level of knowledge of HCP who follow patients with tracheostomy and to increase this level with theoretical training and training in a simulation laboratory. Materials and Methods ISPAT (IStanbul PAediatric Tracheostomy), a multidisciplinary team for tracheostomy care was established and a training program was prepared. Participants were subjected to theoretical and practical pretests which evaluated their knowledge levels and skills for care, follow-up, and treatment of a patient with tracheostomy. After the theoretical and practical training given to the participants with a simulation model, theoretical and practical posttests were applied. Results Fifty-one HCP from nine tertiary pediatric clinics in Istanbul were enrolled in the training program. Only six (11.8%) of them had received standardized training programs previously. Regarding the theoretical tests, seven of the 33 questions were indicated as essential. The knowledge level of the participants based on the essential questions significantly increased after the training (p < 0.05 for all of the essential questions). The total number of correct answers and correct answers of three subheadings also significantly increased after the practical training (p < 0.001 for all). Ninety-five percent of the participants assessed the course as good or excellent in general. Conclusion Training in a simulation laboratory in combination with theoretical education can improve the knowledge and skills of the HCP enabling improved care of children with a tracheostomy. Simulation Center of Koc University

Background Due to advances in technology, home ventilation in children has increased in recent years. The provision of proper care for a home-ventilated (HV) child can have a strong impact on the lifestyle of caregivers. The aim of this study was to evaluate the depression and anxiety levels of the mothers of home-ventilated children during the current COVID-19 pandemic and compare them to those of mothers of healthy peers. Methods This cross-sectional study was conducted on HV children (n=21) and a control group of healthy peers (n=32) by means of a questionnaire completed by the mothers of the children of both groups. Psychometric scales, such as the Beck Depression Inventory (BDI), the State-Trait Anxiety Inventory-State (STAI-S), and the State-Trait Anxiety Inventory-Trait (STAI-T), were used to assess participants. Results During the pandemic signs of depression were present in eight (38.1 %) of the case group and eight (25%) of the healthy control (HC) group. Comparison of the BDI scores from before and during the pandemic showed no difference between mothers of the HV children (p=0.09). Scores for BDI and STAI-T were higher in the case group than in the control group, whereas there was no significant difference in STAI-S scores. Conclusion Depression and anxiety levels of mothers of HV children were found to be higher during the COVID-19 pandemic. Economic, medical and social support resources are needed in order to reduce levels of depression and anxiety and help mothers of those children dependent on technology. This article is protected by copyright. All rights reserved.

Background Tracheostomy-related morbidity and mortality mainly occur due to decannulation, misplacement, or obstruction of the tube. A standardized training can improve the skills and confidence of the caregivers in tracheostomy care (TC). Objective Our primary aim was to evaluate the efficiency of standardized training program on the knowledge and skills (changing-suctioning the tracheostomy tube) of the participants regarding TC. Materials and Methods Sixty-five caregivers of children with tracheostomy were included. First, participants were evaluated with written test about TC and participated in the practical tests. Then, they were asked to participate in a standardized training session, including theoretical and practical parts. Baseline and postintervention assessments were compared through written and practical tests conducted on the same day. Results A significant improvement was observed in the written test score after the training. The median number of correct answers of the written test including 23 questions increased 26%, from 12 to 18 (p < .001). The median number of correct steps in tracheostomy tube change (from 9 to 16 correct steps out of 16 steps, 44% increase) and suctioning the tracheostomy tube (from 9 to 17 correct steps out of 18 steps, 44% increase) also improved significantly after the training (p < .001, for both). Conclusion Theoretical courses and practical hands-on-training (HOT) courses are highly effective in improving the practices in TC. A standardized training program including HOT should be implemented before discharge from the hospital. Still there is a need to assess the impact of the program on tracheostomy-related complications, morbidity, and mortality in the long term.

Background Chronic pulmonary infection is the leading cause of mortality and morbidity in patients with cystic fibrosis (CF). The most common pathogens isolated in CF are Staphylococcus aureus (SA) and Pseudomonas aeruginosa (PA). Chronic infection of PA and methicillin-resistant S. aureus (MRSA) are associated with worse survival and antibiotic eradication treatment is recommended for both. This study compared the outcomes between intravenous (IV) and non-IV antibiotics in eradication of PA and MRSA. Methods This was a single-center retrospective study. All respiratory specimen cultures of 309 CF patients and eradication regimens between 2015 and 2019 were reviewed. Patients received eradication treatment in case of first ever isolation or new isolation after being infection-free >= 1 year. The primary analysis was the comparison of the percentage of successful eradication after receiving IV and non-IV eradication regimens. Demographic and clinical risk factors for eradication failure were also analyzed. Results One hundred and two patients with PA isolations and 48 patients with MRSA were analyzed. At 1 year, 21.6% in PA group and 35.4% in MRSA group were successfully eradicated. There was not any statistically significant difference between IV versus non-IV antibiotic regimens on eradication in either group. Additionally, none of the clinical risk factors was significantly associated with eradication failure in PA and MRSA groups. Conclusion In the eradication of PA and MRSA, IV and non-IV treatment regimens did not show any superiority to one another. Non-parenteral eradication could be a better option considering the cost-effectiveness and the treatment burden of IV treatments due to hospitalization and the need for IV access.

BACKGROUND Nebulizers can be contaminated with microorganisms and may be a source of infection in the lower airways in patients with cystic fibrosis (CF). OBJECTIVE Primary aim of this study was to determine the level of knowledge regarding nebulizer hygiene and adherence to CF foundation infection prevention and control (IPC) measures of CF patients in our center. We also evaluated the effect of a standardized training program on nebulizer cleaning and disinfection practises with pre and posttest. METHODS Caregivers of 173 CF patients followed at Marmara University CF Center filled a questionnaire (pretest) regarding nebulizer hygiene and received didactic education including pictures and videos based on the cystic fibrosis foundation (CFF) IPC guidelines, patients were also provided educational materials. Posttest was performed 1-3 months after the education session. RESULTS Following standardized training, usage of appropriate methods according to CFF IPC guidelines improved significantly. Frequency of nebulizer cleaning after each use increased from 58.4% to 78% (p

Introduction: The pediatric tracheostomy related mortality mostly occurs due to accidental decannulation and cannula obstruction. The caregivers may be discharged with inadequate knowledge. Aims and objectives: Simulation training can highlight skills regarding tracheostomy care. Our aim is to investigate if a standardized hands-on-training improves knowledge and skills among caregivers. Methods: Before the traning, we applied a pretest to caregivers in order to assess their knowledge and current practises. Skills were evaluated by two simulation scenarios in a patient model: cannula change and aspiration. After one hour theoretical and practical hands-on training, the same post-test was applied, skills were reevaluated regarding cannula change and aspiration with practical tests. Results: The multicenter study included 65 caregivers of patients with tracheostomy. The median score of the theoretical test including 23 questions improved from 12 to 18 (p

Introduction: Tracheostomy care in children may be challenging, due to lack of knowledge of health care providers. The aim of this study was to determine the level of knowledge of health care providers who follow patients with tracheostomy and to increase this level with theoretical education and training in a simulation laboratory. Materials and Methods: Volunteer participants were subjected to a theoretical pretest which evaluated their knowledge level for the care, follow-up and treatment of patients with tracheostomy. Then, practical testing with three subheadings evaluating the change of the tracheostomy cannula was applied. After theoretical training and one-on-one practical training given to the participants with a simulation model, theoretical and practical posttests were applied. Results: Fifty-one health care providers from six tertiary pediatric clinics in Istanbul were enrolled in the educational course. Only 6 (11.8%) of them received standardised training programme previously. Regarding the theoretical tests, seven of the 33 questions were indicated as crucial. The knowledge level of the participants based on the crucial questions significantly increased after the training (p value

BACKGROUND Depression and anxiety symptoms in patients with cystic fibrosis (CF) and their caregivers are 2-3 times higher than in the normal population. This study aims to evaluate the frequency and severity of depression and anxiety symptoms and to determine possible risk factors in CF patients and their mother and/or fathers at Marmara University CF center. METHODS The study included 132 CF patients who were followed up at our CF center. Patient Health Questionnaire (PHQ-9) and the Generalized Anxiety Disorder Questionnaire (GAD-7) were used to screen depression and anxiety. The questionnaires were completed by 50 CF patients (aged 12-17 years) and 132 parents of patients (aged 0-17 years). RESULTS While moderate to severe depressive symptoms were seen in 26% of patients, 33.7% of mothers and 14.6% of fathers; moderate to severe anxiety were present in 18%, 21.8% and 8.5%, respectively. None of the demographic characteristics was identified as a predictor of depression or anxiety. GAD-7 scores have shown a higher prevalence of anxiety in mothers of patients with chronic methicillin-resistant Staphylococcus aureus (p = .034). Additionally, hospitalization in the last 12 months was significantly correlated with higher PHQ-9 scores in fathers (p = .043). Analysis of patients' adherence to medical treatment and airway clearance showed higher depression and anxiety in mothers of the nonadherent group (p = .002). CONCLUSION Depression and anxiety were common in CF patients and their parents. These results illustrate the importance of depression/anxiety screening and psychosocial support for the CF patient and their parents.

Background Cystic fibrosis (CF) is a chronic disease causing recurrent respiratory tract infections. Viral respiratory tract infections are more severe in CF. The first case of COVID-19 was seen in Turkey on March 11, 2020 and nationwide school closure and lockdown were implemented. School closure and home confinement might have adverse effects on children’s physical and mental health. In this study, we aimed to compare the effect of COVID-19 pandemic on psychological reactions of CF patients and healthy controls. Methods This is a controlled cross-sectional study including 7-18 year-old children with CF. The survey included questions regarding family environment and peer relations, self care and psychological reactions to COVID-19 pandemic. The questionnaire was applied to children via telephone call under parental supervision. Results We evaluated 132 CF patients and 135 their healthy peers. Mean age was 11.5±2.9 years in CF group and 11.8±3.2 years in control group (p=0.98). There were 55 girls (41.7%) in CF group and 81 girls (60%) in control group (p=0.027). The socioeconomic status of families was similar. CF patients was feeling less anxious about the COVID-19 pandemic compared to controls (p=0.01). CF patients were found to be less anxious for family members having the risk of COVID-19, less upset for the school closure, less anxious about the COVID-19 pandemic (p

Background: Depression and anxiety symptoms in patients with cystic fibrosis (CF) and their caregivers are 2-3 times higher than in the normal population. This study aims to evaluate the frequency and severity of depression and anxiety symptoms and to determine possible risk factors in CF patients and their mother and/or fathers at Marmara University CF center. Methods: The study included 132 CF patients who were followed up at our CF center. Patient Health Questionnaire (PHQ-9) and the Generalized Anxiety Disorder Questionnaire (GAD-7) were used to screen depression and anxiety. The questionnaires were completed by 50 CF patients (aged 12 - 17 years) and 132 parents of patients (aged 0-17 years). Results: While moderate to severe depression were seen in 25.5% of patients, 33.7% of mothers and 14.6% of fathers; moderate to severe anxiety were present in 17.6%, 21.8% and 8.5%, respectively. None of the demographic characteristics was identified as a predictor of depression or anxiety. GAD-7 scores have shown a higher incidence of anxiety in mothers of patients with chronic methicillin-resistant Staphylococcus Aureus (p = 0.034). Additionally, hospitalization in the last 12 months was statistically significantly higher in PHQ-9 scores of fathers (p = 0.043). Analysis of patients’ adherence to medical treatment and airway clearance showed higher depression and anxiety in mothers of the non-adherent group (p = 0.002). Conclusion: Depression and anxiety were common in CF patients and their parents. These results illustrate the importance of depression/anxiety screening and psychosocial support for the CF patient and their parents.

BACKGROUND Congenital lung malformations (CLM) are rare disorders and surgical intervention is the definitive treatment. Our aim is to evaluate the long-term lung function of patients with CLM after surgery compared to healthy children. METHODS Sixteen children with CLM (M/F: 9/7) and 30 age-matched, healthy controls (M/F: 13/17) were included in the study. Demographic data were recorded and both groups were compared by spirometry and the nitrogen-based Lung Clearance Index (LCI). RESULTS Mean ± SD age of the patients was 12.0 ± 5.4 years. The mean forced expiratory volume in 1 s (FEV1 ), forced vital capacity (FVC), FEV1 /FVC, and forced expiratory flow between 25% and 75% of force expiration (FEF25-75 ) predicted was, 86.68 ± 16.65, 88.00 ± 14.58, 97.44 ± 9.89, and 79.00 ± 26.41, respectively in the patient group. Patients with CLM had significantly lower values in FEV1 , FVC, FEF25-75 than healthy controls (P = 0.002, P 0.007, P 0.045). While the mean LCI2,5% value in patients' group was 8.33 ± 1.52, it was 7.28 ± 0.80 in healthy controls (P = 0.023). Strong inverse correlation between LCI and FEV1 , FEV1 /FVC was detected in the patient group (P = 0.023; r: -0.581, P 0.017; r: -0.606 respectively). CONCLUSION This study revealed that, in long-term follow-up, patients who had surgery because of CLM have impairment in the pulmonary function compared to healthy children and LCI may be more accurate in detecting airway diseases early than spirometry.

Objectives: The first case of COVID-19 infection was confirmed in Turkey on March 11, 2020 and the Turkish government ordered a nation-wide school closure and lockdown for people younger than 20 years old by 1st of April. School closure and home confinement might have adverse effects on children's physical and mental health. In this study, we aimed to compare the effect of the COVID-19 pandemic on psychological reactions and coping of CF patients and healthy controls. Methods: 132 CF patients and 135 volunteers, ages 7 years and older, were included in the study. The survey included questions regarding family environment and peer relations, self care during lockdown and psychological reactions to the COVID-19 pandemic. Results: Compared to the patient group, the control group showed more anxiety symptoms, tried to have new hobbies during lockdown and needed more psychological help (Table 1). [Table presented] Conclusion: Surprisingly, symptoms of anxiety were higher in the control group compared to the CF group. CF patients seem to show more resiliance in coping with the outbreak and with school closure than their peers. Also, they reported needing less psychological help (not statistically significant). Since CF patients are already used to wearing face masks and follow infection control measures in their daily lives, these measures may not cause extra anxiety as in their healthy peers. Screening for psychological symptoms should be recommended both for CF patients and healthy children. Children with CF and also healthy children should be screened for anxiety symptoms and appropriate psychological support should be provided to them, if needed.

Erdem Eralp, Ela/0000-0001-8829-3431; Karadag, Bulent/0000-0003-0605-8871; Ergenekon, Almala Pinar/0000-0003-0228-9832; Bas Ikizoglu, Nilay/0000-0002-5102-0031 WOS:000538169900018 PubMed ID: 32851380 Behcet's disease (BD) is a rare autoimmune and chronic inflammatory vasculitis, characterized by relapsing episodes of oral aphthous and genital ulcers, skin lesions, ocular lesions and vascular involvement. Pulmonary artery involvement is rare in BD but it carries a high mortality risk. In this article, we report a 15-year-old male patient presented with a two-month history of hemoptysis, cough, fewer and weight loss. On physical examination, auscultation revealed decreased breath sounds at left lung base. Bronchoscopy showed narrowed left lower lobe bronchus due to the external compression. Computed tomography angiography revealed multiple bilateral pulmonary artery aneurysms. Pathergy test was positive and he was diagnosed with BD. BD should be considered in the differential diagnosis of childhood hemoptysis.

Introduction and Aim: We aimed to evaluate respiratory support need in patients treated with Nusinersen and to report their respiratory follow-up during the treatment period. Material and Methods: The study included patients treated with 4 and more doses of Nusinersen. Patients were evaluated regarding respiratory findings before the initiation of Nusinersen treatment and after the 4.th doses in pediatric pulmonology department. Results: Twenty-seven patients who were followed up from our clinic were included in the study. 44% of the patients were female (n = 12); The mean age was 47.81 ± 6.27 months (7-120 months). The mean treatment duration of the patients was 36.1 ± 7.57 months (2-111 months). Sixteen patients were on home ventilation via tracheostomy, 6 patients were in ICU and mechanically ventilated (5 of them were entubated and 1 of them was tracheostomised). One patient was on non-invasive ventilation and needed O2 support. Four patients breathing spontaniosly in room air.56.2% (n = 9) of home ventilated patients and 50% (n = 3) of patients staying in ICU had clinical improvement. One of the entubated patients was tracheostomized and home ventilation was initiated. Four patients atients breathing spontaniously did not require any respiratory support. The o2 need of the non invasive ventilated patient was ended after the 4.th doses of Nusinersen. Home ventilation therapy was stopped by a family without the knowledge of the clinician after the third doses of Nusinersen theraphy but unfortunately the patient was passed away. Discussion: Long term studies including more patients treated with Nusinersen and specified respiratory scoring systems are needed to evalute the respiratory follow up.

Introduction and Aim: Since January 1, 2015, newborn screening program has been implemented in our country. The aim of this study is to report the clinical and genotype characteristics of patients who were diagnosed as CF after false negative CFNBS results since January 2015. Material and Methods: 1. The IRT value is greater than 90 ng/ml and 2. IRT value greater than 70 were considered suspicious and referred to a sweat test. The sweat test value above 60 mmol/L was considered positive. Results: 63 patients were diagnosed as CF in our clinic between 2015-2018. While 84.2% (n = 53) of the patients were diagnosed by positive CFNBS result, 15.8% of the patients (n = 10) had false negative results of IRT values. Of the 10 patients included in the study, 50% were girls, with a mean age of 30.7 ± 8.8 months (12-39 months); The mean age of diagnosis was 152 ± 147 days (28-480 days). Genetic mutation was detected in all patients. The first IRT level was above 90 µg/l in 40% (n = 4) of the patients. 40% of the patients had pancreatic insufficiency and Pseudobartter was detected in 70% of patients. Pseudomonas aeroginosa growth in sputum culture was detected in 60% of patients whereas MRSA growth was 10%. 30% of the patients had anemia. Conclusion: Regardless of the results of the newborn screening tests, patients with symptoms supporting CF should be further evaluated. For the patients with intermediate sweat test results, genetic analysis should be performed for CF. As seen in our study, it should be kept in mind that IRT negativity may also occur in mutations that cause severe CF.

BACKGROUND Cystic fibrosis (CF) genotyping has garnered increased attention since the discovery of the cystic fibrosis transmembrane conductance regulator (CFTR) gene in 1989 led to the identification of over 1700 mutations on chromosome 7. Yet, little is known about the genetic profile of CF patients in Turkey. This study sought to determine the mutation distribution among CF patients seeking care at Marmara University. METHODS Two hundred fifty previously diagnosed CF patients were included in the study. CFTR gene exons 1 to 27 were amplified by a polymerase chain reaction and whole DNA sequencing was performed. Duplications and deletions were investigated by the multiplex ligation-dependent probe amplification (MLPA) technique in patients with one or two unidentified mutations in sequence analysis. RESULTS CFTR mutation analysis revealed 80 mutations and five large deletions were present in our study population. The five most common mutations were (delta) F508 (c.1521-1523delCTT) (28.4%), 1677delTA (c.1545-1546delTA) (6.4%), 2789 + 5G- > A (c.2657 + 5G > A) (5.8%), N1303K (c.3909C > G) (2.4%), and c.2183AA- > G (c.2051-2052delAAinsG) (4.0%). Large deletions were found in 16 patients. Four novel mutations and two novel deletions were detected in this study. CONCLUSIONS We have identified four novel mutations and two novel deletions using next-generation DNA sequencing and the MLPA technique and obtained an overall mutation detection rate of 91.4%. Detection of novel variants in CF patients will assist in genetic counseling and in determining appropriate patients for new therapies.