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Oxygen saturation/minute heart rate index: Simple lung function test for children
Author(s) -
Ozdemir Ali,
Dogruel Dilek,
Yilmaz Ozlem
Publication year - 2017
Publication title -
pediatrics international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.49
H-Index - 63
eISSN - 1442-200X
pISSN - 1328-8067
DOI - 10.1111/ped.13081
Subject(s) - medicine , spirometry , airway obstruction , asthma , pulse oximetry , cardiology , oxygen saturation , airway , pulmonary function testing , lung volumes , anesthesia , lung , oxygen , chemistry , organic chemistry
Background The severity of airway obstruction can be accurately determined on spirometry in children with asthma. Other assessments may include peak expiratory flow and pulse oximetry. In the present study, we evaluated the validity and reliability of oxygen saturation/minute heart rate (SpO 2 / MHR ) index in the prediction of degree of severe airway obstruction in children with asthma. Methods This was a retrospective study of children aged 7–17 followed for asthma at Mersin Women and Children's Hospital. The study compared SpO 2 / MHR ratio with forced expiratory volume in 1 s ( FEV 1 ) measured on spirometry, an important indicator of small airway obstruction. A total of 296 patients were included in the study, and classified either as having normal FEV 1 ( FEV 1 > 80% of predicted, n = 178) or severely reduced FEV 1 ( FEV 1 < 60% of predicted, n = 118). Positive and negative predictive values ( PPV and NPV ), sensitivity and specificity of SpO 2 / MHR index in predicting low FEV 1 were calculated on receiver operating characteristics analysis. Results An SpO 2 / MHR ratio cut‐off <0.90 was associated with a PPV of 83.14%, NPV of 71.77%, sensitivity of 80.34% and specificity of 75.42% in predicting low FEV 1 . Conclusions SpO 2 / MHR ratio appears to be a highly useful index to assess airway obstruction in older children with asthma. Thus, it can be used as a marker of airway obstruction severity when spirometry is not available.