Use of the technique of counting numbers as a predictor of slow vital capacity in hospitalized individuals

PURPOSE:

to evaluate if there is a correlation between the slow vital capacity and the maximum phonation time by technique of counting numbers and if it is possible from the maximum phonation time estimate the slow vital capacity in hospitalized individuals.

METHODS:

it is a cross-sectional study, crossover and choice of techniques (technique of numerical count and spirometry) were performed randomly (simple draw). The slow vital capacity was measured by spirometry and maximum phonation time was assessed using the technique of counting numbers.

RESULTS:

participated in the research 221 hospitalized patients. A positive correlation was observed between the Slow vital capacity and maximum phonation time evaluated on an absolute (r = 0.75; p <0.001) and relative (r = 0.76; p <0.001). From the simple linear regression of the data, were verified equations of the lines analyzed absolutely, Slow vital capacity = 55 Technique of numerical count + 735 (r² = 0,56; p < 0,0001) and relative Slow vital capacity = 0,84 Technique of numerical count + 14 (r² = 0,57; p < 0,0001).

CONCLUSIONS:

the results obtained in this study showed a good correlation between the techniques evaluated, possible to estimate the Slow vital capacity from the technique of counting numbers in hospitalized individuals.

Respiratory Function Tests; Vital Capacity; Phonation