The Application Of Nasal CT Scan In Evaluating The Function Of Nasal Venting In Patiens With Deflection Of Nasal Septum

Backgroud and Purpose: As the first part of airway, one of the important function of nasal cavity is to sustain normal ventilation. Any mechanicalness or reflectivity or infected cause can destroy the nasal function to sustain normal ventilation ,and then cause the obsruction of nasal cavity . Because there is not a objective standard or examination method to evaluate the state of nasal venting , we always meet the problem that there is difference between the result of the frontal mirror and the subjective sensation of patients . It affects the iatric assessment of diagosis and theraphia to the nasal obstructive disease. Many scholars had done a lot of study to solve the problem.During this period,they invented a lot of method. With these methods ,we can only measure the functional index, but cannot exactly and intuitionisticly obtain the structure change of nasal structure configuration.In this field, CT should be used expansivly .It can not only accurately measure the cross sectional area, distance, and the thickness of parenchyma, but also it can show the postural connection between the nasal local position and surrounding structure . The purpose is to compare the CT scan results in patiens with deflection of nasal septum and normal adults and to explore its values in evaluating the state of nasal venting. Methods:15 patients with deflection of nasal septum and 27normal pepole were included in the study. The subject in the prone position,expands his head excessively and backwardly. As the touchline of external acoustic meatus is baseline, perpendicular with canthomeatal line. The nasal airway from antetior nastril to posterior nastril was evaluated with the use of a PhlipsTomos scan AV Expander Elspiral scanner. The distance and thickness of layer are 5mm. The results of CT scan was shooted by numeric camera and then were imputed into computer .Using the image-analysis software to measure these indexes of nasal venting . The nasal minimal cross sectional area , inferior turbinate's maximumal cross sectional area , the distance of nasal minimal cross sectional area from the anterior extremity of inferior turbinate's ;the distance of inferior turbinate's maximal cross section from the anterior extremity of inferior turbinate's; the opposite nasal minimal cross sectional area in the patients with deflection of nasal septum according with obstruction in opposite site; the opposite nasal minimal cross sectional area in the patients with deflection of nasal septum without obstruction in opposite site; the distance of nasal minimal cross section area in the opposite side from the anterior extremity of inferior turbinate's in the patients with deflection of nasal septum according with obstruction in opposite site ;the distance of nasal minimal cross section area in the opposite side from the anterior extremity of inferior turbinate's in the patients with deflection of nasal septum without obstruction in opposite site were evaluated. At last compare the results of CT scan between patients with deflection of nasal septum and normal people. Result:(1)The nasal minimal cross sectional area in the patients with deflection of nasal septum was 1.50±0.52. And the nasal minimal cross sectional area in normal people was 2.06±0.48. There were obvious difference between patients with deflection of nasal septum and normal people in nasal minimal cross sectional area ,P=0.002<0.01;(2) The inferior turbinate's maximumal cross sectional area in patients with deflection ofnasal septum was 1.86±0.70. And the inferior turbinate's maximumal cross sectional area in normal people was 1.39±0.44. There were obvious difference between patients with deflection of nasal septum and normal people in nasal minimal cross sectional area , P=0.026<0.05;(3) The distance of nasal minimal cross section area from the anterior extremity of inferior turbinate's was 18.84±20.70 in the patients with deflection of nasal septum. And the distance of nasal minimal cross section area from the anterior extremity of inferior turbinate's was -0.40±4.