Objectives During the COVID-19 pandemic, healthcare professionals are recommended to use PPE to prevent the transmission of disease. Healthcare workers who use N95 FFR, which has an important place, experience complaints such as headache and dizziness. In this study, we plan to find the cause of these complaints and aim to clarify whether they are associated with the use of N95 mask. Method Healthcare workers first put on a surgical mask for at least 1 h and a maximum of 4 h, this process was then repeated on another day with the same workers wearing N95 masks. After removing the mask, capillary blood gases were taken and a questionnaire was given. Results Thirty-four participants over the age of 18 were included in the study; 19 participants were female (56%) and 15 male (44%). The results of the capillary blood gas analysis after the use of surgical mask and N95 mask, respectively: pH: 7.43 ± 0.03; 7.48 ± 0.04 ( p < 0.001); p CO 2 : 37.33 ± 8.81; 28.46 ± 7.77 mmHg ( p < 0.001); HCO 3 : 24.92 ± 2.86; 23.73 ± 3.29 mmol/L ( p = 0.131); Base excess (BE): 1.40 (− 3.90–3.10); − 2.68 (− 4.50–1.20) [median (Q1−Q3)] ( p = 0.039); lactate: 1.74 ± 0.68; 1.91 ± 0.61 ( p = 0314). Headache, attention deficit and difficulty in concentrating were significantly higher after using N95 mask. Conclusion Respiratory alkalosis and hypocarbia were detected after the use of N95. Acute respiratory alkalosis can cause headache, anxiety, tremor, muscle cramps. In this study, it was quantitatively shown that the participants’ symptoms were due to respiratory alkalosis and hypocarbia.

Background and aim Occasionally, children with COVID-19 may develop arrhythmia, myocarditis, and cardiogenic shock involving multisystemic inflammatory syndrome in children (MIS-C). This study aimed to identify the laboratory parameters that may predict early cardiovascular involvement in these patients. Materials and methods Data of 320 pediatric patients, aged 0–18 years (average age, 10.46 ± 5.77 years; 156 female), with positive COVID-19 reverse transcription–polymerase chain reaction test and with cardiac biomarkers at the time of admission to the pediatric emergency department were retrospectively scanned. The age, sex, COVID-19-associated symptoms, pro-brain natriuretic peptide (proBNP), CK-MB, and troponin I levels of the patients were recorded. Results Fever was noted in 58.1% of the patients, cough in 29.7%, diarrhea in 7.8%, headache in 14.7%, sore throat in 17.8%, weakness in 17.8%, abdominal pain in 5%, loss of taste in 4.1%, loss of smell in 5.3%, nausea in 3.4%, vomiting in 3.8%, nasal discharge in 4.4%, muscle pain in 5%, and loss of appetite in 3.1%. The proBNP value ≥282 ng/L predicted the development of MIS-C with 100% sensitivity and 93% specificity [AUC: 0.985 (0.959–1), P < 0.001]; CK-MB value ≥2.95 with 80% sensitivity and 77.6% specificity [AUC: 0.792 (0.581–1), P = 0.026]; and troponin I value ≥0.03 with 60% sensitivity and 99.2% specificity [AUC: 0.794 (0.524–1)]. Conclusions Cardiac markers (proBNP and troponin I), especially proBNP, could be used to detect early diagnosis of cardiac involvement and/or MIS-C in pediatric patients with COVID-19 and to predict related morbidity and mortality.

Aim: Nutritional B12 deficiency is a treatable cause of neurodevelopmental delay in infants. We report 21 infants with developmental regression and brain atrophy as revealed using cranial magnetic resonance imaging (MRI), secondary to severe vitamin B12 deficiency.Methods: Twenty-one infants aged 4-24 months with B12 deficiencies who were admitted to our clinic between May 2013 and May 2018 were included in the study. MRI, bone marrow aspiration and the Denver-II Developmental Screening Test were performed in all infants. Results: The mean age of the infants was 12.3 months, and the mean B12 level was 70.15 AE 32.15 ng/L. Hypotonia and neurodevelopmental retardation, and anaemia were present in all patients. Their bone marrow examinations were compatible with megaloblastic anaemia. Twelve patients had microcephaly, seven had tremor and one patient died of severe sepsis. Almost all patients were fed with breast milk and their mothers were also malnourished. Nine (42.9%) of the patients were Turkish and 12 (57.1%) were Syrian. All patients had abnormal Denver-II Developmental Screening Test scores. Most patients had severe cortical atrophy, cerebral effusion, thinning of the corpus callosum and delayed myelinisation in cranial MRI. Treatment with B12 resulted in dramatic improvement in general activity and appetite within 72 h. Tremors resolved in all cases. Conclusion: Neurological findings and developmental delay related to nutritional B12 deficiency can be prevented without sequelae if diagnosed early. Screening and treating of mothers for this deficiency will contribute to the health of both the mother and their feeding infant.

uNGAL can be useful as a predictive marker of AKI in nonseptic and nonasphyxiated but critically ill preterm infants.

Objectives The aim of this study was to investigate the pulmonary function of pediatric patients with COVID-19 after recovery. Methods Pediatric patients aged 5–18 years hospitalized with diagnoses of COVID-19 and discharged with recovery were included in this prospective study. Pulmonary function tests (PFTs) were performed through spirometry. Results The patient group consisted of 34 children and the control group of 33. The forced vital capacity (FVC%) values of the control and patient groups were 110.62±11.71 and 94.21±13.68 (p<0.001), forced expiratory volume in the first second (FEV1%) values were 104.91±6.26 and 98.67±14.93 (p=0.032), FEV1/FVC% values were 108.50±8.81 and 101.06±24.89 (p=0.034), and forced expiratory flow (FEF) 25–75% values were 106.71±6.68 and 101.85±24.89, respectively (p=0.286). However, Spearman correlation analysis revealed moderate negative correlation between length of hospital stay and FEF 25–75% (r=−0.364, p=0.35). Conclusion PFTs in pediatric patients after recovery from COVID-19 were abnormal in the present study. The results were significant in terms of the development of mixed-type lung disease. Further long- and short-term studies are now needed for a better understanding of the prognosis in these patients.