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

Abstract

OBJETIVO:avaliar se existe correlação entre a capacidade vital lenta e o tempo máximo de fonação, mais especificamente pela técnica de contagem numérica e se é possível a partir do tempo máximo de fonação estimar a capacidade vital lenta em indivíduos hospitalizados.MÉTODOS:trata-se de um estudo do tipo transversal, crossover e a escolha das técnicas (espirometria e técnica de contagem numérica) foram realizadas de forma randomizada (sorteio simples). A capacidade vital lenta foi mensurada por meio da espirometria e o tempo máximo de fonação foi avaliado a partir da técnica de contagem numérica.RESULTADOS:participaram da pesquisa 221 pacientes hospitalizados. Foi verificada uma correlação positiva entre a capacidade vital lenta e o tempo máximo de fonação avaliados de forma absoluta (r = 0,75; p < 0,001) e relativa (r = 0,76; p < 0,001). A partir da regressão linear simples dos dados, foram verificados equações das retas analisadas de forma absoluta, Capacidade vital lenta = 55 Técnica de contagem numérica + 735 (r2= 0,56; p < 0,0001) e relativa, Capacidade vital lenta = 0,84 Técnica de contagem numérica + 14 (r2= 0,57; p < 0,0001).CONCLUSÕES:os resultados obtidos nesta pesquisa mostraram uma boa correlação entre as técnicas avaliadas, sendo possível estimar a capacidade vital lenta a partir da técnica de contagem numérica em indivíduos hospitalizados.

Single breath counting technique to assess pulmonary function: a systematic review and meta-analysis

“…This systematic review aimed to verify the applicability of SBCT as a VC assessment parameter. Of the 11 selected studies, nine (82%) observed that there was a relationship between these variables through correlation and linear regression [12,13,16,[38][39][40][41][42][43]. Only two articles evaluated the accuracy of the test, one of which identified a cutoff point of 21 in the SBCT to predict low lung function (SVC < 20 ml kg −1 ) 4B -NIH quality assessment tool for cross-sectional studies Study in hospitalized patients with various diseases [8] and another estimated a count lower than 41 for a VC below 80% of predicted in patients with NMD [43].…”

“…The selected articles included one diagnostic accuracy study [8], one concordance study [15], seven crosssectional [12,13,16,[39][40][41][42], and two that did not inform the design [43,44]. They were conducted in five countries, Brazil [8,12,15,16,40,42], Saudi Arabia [41], Argentina [39], Germany [43] and the USA [13,44]. The age of participants was wide across studies, ranging from 12 to 59 years.…”

“…The age of participants was wide across studies, ranging from 12 to 59 years. The profile of patients was different; four studies involved hospitalized patients [8,12,16,40] including one with a patient in the postoperative period of cardiac surgery [40] and four studies with patients with neuromuscular diseases [39,41,43,44], and two exclusively with healthy individuals [15,42] and one with children [13] (table 2).…”

“…Vital capacity was evaluated as the main lung function variable in all studies. Five studies adopted FVC [13,39,41,43,44], six studies adopted SVC [8,12,15,16,40,42] and note that all the SVC studies were conducted in Brazil.…”

“…As lung function is directly related to voice production, individuals with limited lung functionality may have altered SBCT [8,[11][12][13][14]. There is evidence that this technique presents a good correlation, reproducibility [15] and accuracy [8] with the standard values of spirometry, mainly with the VC [12,13,16]. Most adults with normal ventilatory function are able to count to 50 in a single breath.…”