Estimation of lung vital capacity before and after coronary artery bypass grafting surgery: a comparison of incentive spirometer and ventilometry

Abstract

BackgroundMeasurement of vital capacity (VC) by spirometry is the most widely used technique for lung function evaluation, however, this form of assessment is costly and further investigation of other reliable methods at lower cost is necessary. Objective: To analyze the correlation between direct vital capacity measured with ventilometer and with incentive inspirometer in patients in pre and post cardiac surgery.MethodologyCross-sectional comparative study with patients undergoing cardiac surgery. Respiratory parameters were evaluated through the measurement of VC performed by ventilometer and inspirometer. To analyze data normality the Kolmogorov-Smirnov test was applied, for correlation the Pearson correlation coefficient was used and for comparison of variables in pre and post operative period Student's t test was adopted. We established a level of ignificance of 5%. Data was presented as an average, standard deviation and relative frequency when needed. The significance level was set at 5%.ResultsWe studied 52 patients undergoing cardiac surgery, 20 patients in preoperative with VC-ventilometer: 32.95 ± 11.4 ml/kg and VC-inspirometer: 28.9 ± 11 ml/Kg, r = 0.7 p < 0.001. In the post operatory, 32 patients were evaluated with VC-ventilometer: 28.27 ± 12.48 ml/kg and VC-inspirometer: 26.98 ± 11 ml/Kg, r = 0.95 p < 0.001. Presenting a very high correlation between the evaluation forms studied.ConclusionThere was a high correlation between DVC measures with ventilometer and incentive spirometer in pre and post CABG surgery. Despite this, arises the necessity of further studies to evaluate the repercussion of this method in lowering costs at hospitals.

Correlação entre a capacidade vital lenta e o tempo máximo de fonação em adultos saudáveis

“…Some studies 23 have tried to assess and / or correlate the SVC with other devices, however it was not found studies using the voice as a means of estimating the SVC.…”

Proposta de utilização da técnica de contagem como preditor da capacidade vital lenta em indivíduos hospitalizados

“…The attempt to evaluate the SVC by other methods different of spirometry has been described in the literature. Pinheiro et al 10 to justify the high cost of conventional techniques and the low availability of ventilometer and/or spirometers in clinical practice proposed as an alternative to this problem using an equipment used for incentive spirometry (IS) to be a cheaper and easier method. However, although the study have shown a higher correlation between the SVC and EI as compared with SVC and counting technique data found in this study (r = 0.95 vs r = 0.76 both with p <0.001 ), the use of EI differs from the main objective of this research did not use specific devices, in addition, the authors did not discuss the reason and not justified to have presented an equation for the evaluated variables that would possibly be used to estimate the SVC in their results.…”

“…As pulmonary function is directly associated with voice production, individuals with lung disease may have altered the MPT and reduction in the amount of air available to support phonation, characterizing a problem in controlling the airflow 3,8,9 . The use of specific devices for pulmonary evaluation, addition to have a high commercial value, is not always available in clinical practice 10 . Therefore, the use of an alternative technique may be useful for evaluating patients in private clinics, family health programs and hospital setting.…”

Accuracy of single-breath counting test to determine slow vital capacity in hospitalized patients

“…Individuals hospitalized can have decreased SVC regardless of the reason that led to hospitalization, and identify this functional limitation in various diseases, can help treat them adequate [3][4][5][16][17][18] . Vital capacity lower than 20 ml/kg is described in the literature 5 as an important value to trace possible interventions in patients regardless of the related disease, confirming the purpose of this research that does not separate individuals by disease, indicating that simply viewing a decrease in these values for starting treatment.…”