Jenny Svedenkrans1,2,3, Benjamin Stoecklin1,4,5, J Gareth Jones6, Dorota A Doherty7, J Jane Pillow1,4. 1. 1Centre for Neonatal Research and Education. 2. 2Division of Pediatrics, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden. 3. 3Department of Neonatal Medicine, Karolinska University Hospital, Stockholm, Sweden. 4. 4School of Human Sciences, and. 5. 5Neonatal Clinical Care Unit, King Edward Memorial Hospital, Perth, Australia; and. 6. 6University Department of Anaesthesia, Addenbrooke's Hospital, Cambridge, United Kingdom. 7. 7Division of Obstetrics and Gynaecology, Medical School, University of Western Australia, Perth, Australia.
Abstract
Rationale: A sensitive outcome measure for infants with bronchopulmonary dysplasia would facilitate clinical benchmarking and enhance epidemiologic understanding, evaluation of clinical interventions, and outcome prediction. Objectives: Noninvasive assessment of pulmonary gas exchange in preterm infants with and without bronchopulmonary dysplasia to grade disease severity and to identify determinants of impaired gas exchange. Methods: This is a prospective observational study in very preterm infants. Inspired oxygen partial pressure (PiO2) was decreased stepwise to achieve oxygen saturation as measured by pulse oximetry (SpO2) that decreased from 95% to 86%. Right shift, V⋅a/Q⋅, and right-left shunt were derived from the resulting SpO2 versus PiO2 curve and compared with current disease severity classification. Potential determinants of shift, V⋅a/Q⋅, and shunt were identified using principal components analysis and multiple linear regression.Measurements and Main Results: A total of 219 infants with median (interquartile range) gestation of 28 weeks and 0 days (26 weeks and 0 days to 29 weeks and 0 days) had a valid study at 35 weeks and 4 days (34 weeks and 1 day to 39 weeks and 3 days) of postmenstrual age. Shift increased and V⋅a/Q⋅ decreased as severity of bronchopulmonary dysplasia increased. Infants with moderate-severe disease also had increased shunt. Extent of impaired gas exchange overlapped between severity groups. Infants requiring mechanical support but no supplemental oxygen at 36 weeks' postmenstrual age had similar values of shift, V⋅a/Q⋅, and shunt to preterm infants without bronchopulmonary dysplasia. Lower gestation and increased duration of invasive ventilation independently predicted increased shift, decreased V⋅a/Q⋅, and increased shunt. Shift was the most sensitive and specific index of the severity of bronchopulmonary dysplasia.Conclusions: Most infants with bronchopulmonary dysplasia have impaired oxygenation quantified by a simple, sensitive bedside test. Shift of the SpO2/PiO2 curve may be useful for prediction and measurement of preterm infant respiratory outcomes.
Rationale: A sensitive outcome measure for infants with bronchopulmonary dysplasia would facilitate clinical benchmarking and enhance epidemiologic understanding, evaluation of clinical interventions, and outcome prediction. Objectives: Noninvasive assessment of pulmonary gas exchange in preterm infants with and without bronchopulmonary dysplasia to grade disease severity and to identify determinants of impaired gas exchange. Methods: This is a prospective observational study in very preterm infants. Inspired oxygen partial pressure (PiO2) was decreased stepwise to achieve oxygen saturation as measured by pulse oximetry (SpO2) that decreased from 95% to 86%. Right shift, V⋅a/Q⋅, and right-left shunt were derived from the resulting SpO2 versus PiO2 curve and compared with current disease severity classification. Potential determinants of shift, V⋅a/Q⋅, and shunt were identified using principal components analysis and multiple linear regression.Measurements and Main Results: A total of 219 infants with median (interquartile range) gestation of 28 weeks and 0 days (26 weeks and 0 days to 29 weeks and 0 days) had a valid study at 35 weeks and 4 days (34 weeks and 1 day to 39 weeks and 3 days) of postmenstrual age. Shift increased and V⋅a/Q⋅ decreased as severity of bronchopulmonary dysplasia increased. Infants with moderate-severe disease also had increased shunt. Extent of impaired gas exchange overlapped between severity groups. Infants requiring mechanical support but no supplemental oxygen at 36 weeks' postmenstrual age had similar values of shift, V⋅a/Q⋅, and shunt to preterm infants without bronchopulmonary dysplasia. Lower gestation and increased duration of invasive ventilation independently predicted increased shift, decreased V⋅a/Q⋅, and increased shunt. Shift was the most sensitive and specific index of the severity of bronchopulmonary dysplasia.Conclusions: Most infants with bronchopulmonary dysplasia have impaired oxygenation quantified by a simple, sensitive bedside test. Shift of the SpO2/PiO2 curve may be useful for prediction and measurement of preterm infant respiratory outcomes.
Authors: Bernard Thébaud; Kara N Goss; Matthew Laughon; Jeffrey A Whitsett; Steven H Abman; Robin H Steinhorn; Judy L Aschner; Peter G Davis; Sharon A McGrath-Morrow; Roger F Soll; Alan H Jobe Journal: Nat Rev Dis Primers Date: 2019-11-14 Impact factor: 52.329
Authors: Aline B Maddux; Peter M Mourani; Russell Banks; Ron W Reeder; Murray M Pollack; Robert A Berg; Kathleen L Meert; Patrick S McQuillen; Andrew R Yates; Daniel A Notterman; John T Berger Journal: Respir Care Date: 2021-10 Impact factor: 2.339