Correlation Between Differential Spirometry and Radiographic and Gammagraphic Methods

Abstract

In 45 patients with different pulmonary diseases and diverse impairment of pulmonary function, their pulmonary function was evaluated with radiography, spirometry, diffusion capacity, differential spirometry, and pulmonary gammagraphy (lung scanning). Percent comparisons were made between the data obtained from the differential spirometry about ventilation and perfusion, and an estimate of ventilation from the chest radiograph and the results from pulmonary gammagraphy. Because the correlation coefficient between the above mentioned data were high, evaluation of function from pulmonary radiography and gammagraphy can be used to study the function of each lung at rest ‘in lieu’ of different spirometry.

Factors Influencing the Diffusing Capacity of Each Lung

“…The difference between the two values for VO2 was statistically significant too, and this and the difference between the ventilations is due to the fact that the patient's metabolism during differential spirometry is similar to that en countered during moderate exercise [9], The correlation coefficient between theVC>2 of the right lung in percent and the radioactivity in percent of the same lung was excellent (r=0.98 p <0.001) ( fig. 4) and similar to that found in other studies [21][22][23][24]. The corre lation coefficient between the sum of the DLCO of each lung obtained during differential spirometry and the DLCO obtained through mouthpiece was ex cellent (r =0.9571, p <0.001) (fig.…”

Pulmonary Function and Lung Resection

“…The radiological examination of the chest could inform about the function of each lung [7]. For this purpose chest radio graphs should be performed in forced inspiration and expiration to ascertain the mobility of the diaphragm.…”

Indications for Pulmonary Function Testing

“…The recording of the radioactivity can be made with detectors [26] or with a gamma camera [27]. These studies with ra dionuclides compare with bronchospirometry very advantageously [28]. They also provide the needed information about re gional lung function to the patient and are more physiological because the patient does not have to breathe through the stenosis produced by the catheter during bronchospirometry.…”