The Screening and Diagnostic Value of Posterior Lung Field Angles on Abnormal Pulmonary Function
The Screening and Diagnostic Value of Posterior Lung Field Angles on Abnormal Pulmonary Function
Zhimin Wu1,2, Yaping Yang1, Arshad Zahoor1, Aftab Shaukat1 and Ganzhen Deng1,2*
ABSTRACT
Radiography has been applied widely in clinical diagnosis of canine pulmonary diseases for the sensitive and direct perception to the abnormal changes. Due to few of relevant reports about different measurement methods and indexes, the simple radiographic findings are difficult to be used in accurate clinical evaluation. This test aimed to develop a radiographic method of comparing canine posterior lung field angles include vertebrophrenic angle (cranial), vertebrophrenic angle (caudal), sterno-diaphragmatic angle, costophrenic angle (left), costophrenic angle (right) to identify whether pulmonary disordered. Meanwhile this method also introduced the indexes of thorax, such as height, width and their ratio which were measured and/or calculated for further normalizing the differential indexes. Healthy pulmonary radiographies (n=76) were selected to scale the normal parameter threshold, and patients with respiratory diseases and obvious clinical syndromes (n=57) were selected as trials to evaluate and confirm the availability of these indexes for the diagnosis of canine pulmonary function. The most valuable indexes for the clinical diagnosis of abnormal pulmonary function were selected with correlation analysis and single factor analysis of variance. The posterior lung field angles and the thoracic indexes showed no correlation in both healthy group and unhealthy group (r<0.3). The posterior lung field angles and the thoracic indexes between healthy with unhealthy dogs showed low correlation (r<0.5). The thoracic indexes between both groups were no significantly different (p>0.05). Only vertebrophrenic angle (cranial) and vertebrophrenic angle (caudal) in all angles measured significantly differed in healthy group versus unhealthy group (p<0.01).
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