Brazilian Journal of Pulmonology

ISSN (on-line): 1806-3756 | ISSN (printed): 1806-3713

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Current Issue: 2015 - Volume 41 - Number 5 (September/October)

ORIGINAL ARTICLE

Lung function and left ventricular hypertrophy in morbidly obese candidates for bariatric surgery

Função pulmonar e hipertrofia ventricular esquerda em obesos mórbidos candidatos a cirurgia bariátrica

 

Paulo de Tarso Müller1; 2; Hamilton Domingos3; Luiz Armando Pereira Patusco1; 2; Gabriel Victor Guimarães Rapello1

 

1. Laboratório de Fisiopatologia Respiratória - LAFIR - Universidade Federal de Mato Grosso do Sul, Campo Grande, Brasil.
2. Disciplina de Pneumologia, Faculdade de Medicina, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brasil.
3. Disciplina de Cardiologia, Faculdade de Medicina, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brasil.
Submitted: 23 February 2015.
Accepted: 5 July 2015.
Study carried out in the Laboratório de Fisiopatologia Respiratória - LAFIR - Universidade Federal de Mato Grosso do Sul, Campo Grande (MS) Brasil.

Correspondence to:
Paulo de Tarso Müller. Avenida Senador Filinto Müller, S/N, Vila Ipiranga, Campus da Universidade Federal de Mato Grosso do Sul, Faculdade de Medicina, CEP 79070-900, Campo Grande, MS, Brasil.
Tel.: 55 67 3345-3149. E-mail: paulo.muller@ufms.br
Financial support: None.


 

Abstract

Objective: To look for correlations between lung function and cardiac dimension variables in morbidly obese patients, in order to test the hypothesis that the relative size of the small airways is independently correlated with left ventricular hypertrophy. Methods: This was a retrospective study involving 192 medical records containing a clinical protocol employed in candidates for bariatric surgery between January of 2006 and December of 2010. Results: Of the 192 patients evaluated, 39 (10 males and 29 females) met the inclusion criteria. The mean BMI of the patients was 49.2 ± 7.6 kg/m2, and the mean age was 35.5 ± 7.7 years. The FEF25-75/FVC, % correlated significantly with left ventricular posterior wall thickness and relative left ventricular posterior wall thickness, those correlations remaining statistically significant (r = −0.355 and r = −0.349, respectively) after adjustment for weight, gender, and history of systemic arterial hypertension. Stepwise multivariate linear regression analysis showed that FVC and FEV1 were the major determinants of left ventricular mass (in grams or indexed to body surface area). Conclusions: A reduction in the relative size of the small airways appears to be independently correlated with obesity-related cardiac hypertrophy, regardless of factors affecting respiratory mechanics (BMI and weight), gender, or history of systemic arterial hypertension. However, FEV1 and FVC might be important predictors of left ventricular mass in morbidly obese individuals.

 

Resumo

Objetivo: Verificar a existência de correlações entre variáveis de função pulmonar e de dimensões cardíacas em obesos mórbidos, buscando testar a hipótese de que o tamanho relativo das pequenas vias aéreas correlaciona-se com hipertrofia cardíaca esquerda de forma independente. Métodos: Estudo retrospectivo de 192 prontuários médicos que continham um protocolo clínico de candidatos à cirurgia bariátrica entre janeiro de 2006 a dezembro de 2010. Resultados: Dos 192 pacientes avaliados, 39 (29 mulheres) preencheram os critérios de inclusão. A média do IMC foi de 49,2 ± 7,6 kg/m2, e a média de idade foi de 35,5 ± 7,7 anos. As correlações da FEF25-75/CVF, % com a espessura da parede posterior do ventrículo esquerdo e a espessura relativa da parede posterior do ventrículo esquerdo se mantiveram estatisticamente significativas após ajuste para peso, sexo e história de hipertensão arterial sistêmica (r = −0,355 e r = −0,349, respectivamente). Após análise de regressão linear multivariada stepwise, a CVF e o VEF1 foram os principais determinantes da massa ventricular esquerda (em gramas ou indexada para área de superfície corporal). Conclusões: Uma redução no tamanho relativo das pequenas vias aéreas parece apresentar uma correlação independente com hipertrofia cardíaca relacionada à obesidade, independente de fatores que afetam a mecânica respiratória (IMC e peso), sexo ou história de hipertensão arterial sistêmica. O VEF1 e a CVF, por outro lado, podem ser importantes determinantes preditivos da massa ventricular esquerda em obesos mórbidos.

 

 

Keywords: Obesity; Spirometry; Echocardiography; Body mass index.

 

Palavras-chave: Obesidade; Espirometria; Ecocardiografia; Índice de massa corporal.

 

 

INTRODUCTION

Obesity is an isolated risk factor for cardiovascular disease; it can lead to cardiac hypertrophy followed by dilated car-diomyopathy, predisposing to fatal arrhythmias. (1) Obesity also causes organ-specific changes, which are due to a direct mechanical effect of the adipose tissue or occur systemically through humoral mediators and metabolic adjustments that change heart hemodynamics and geometry, as well as possibly lung function.(1-3)

A recent epidemiological study(4) found a relationship between lung function and left ventricular mass (LVM), although the relationship differed between genders. Functional effects of obesity that are associated with being male or female are common in pulmonary function testing, since fat concentrated in the chest (android obesity) could lead to deeper changes in lung function than could fat concentrated in the hips (gynecoid obesity). In contrast, another study, which had a case-control design and involved children with and without metabolic syndrome, found no relationship between lung function and LVM.(5)

Recent evidence suggests that inflammatory mediators act independently of confounding variables on cardiac remodel-ing in obese individuals,(2,6) as well as on lung function,(7,8) primarily at the level of the small airways. In contrast, there is evidence of purely mechanical cardiopulmonary effects, with no effect of inflammatory mediators,(9,10) or an interaction of mechanical and inflammatory factors in cases of lung function and asthma associated with obesity.(11)

Therefore, the primary objective of this exploratory study was to look for correlations between lung function and cardiac dimension variables, in order to test the hypothesis that regardless of being a purely mechanical or gender-related factor, the relative size of the small airways (dysanapsis), as measured indirectly by the ratio of FEF25-75% to FVC (FEF25-75/FVC, %), is correlated with left ventricular hypertrophy (remodeling), since the small airways are especially susceptible to mechan-ical-inflammatory interactions and bronchial hyperreactivity. Similarly, we aimed to determine the degree of association between lung function and ventricular mass in the study population, with the goal of guiding future studies related to common mechanisms of cardiac and pulmonary impairment in morbid obesity. To the best of our knowledge, based on our review of currently available databases (Bireme, SciELO, PubMed, Cochrane Library, and Google Academic), this is the first study to investigate this relationship in morbidly obese individuals.

METHODS

We planned this study based on secondary data obtained from a bariatric surgery outpatient clinic, which is a state re-ferral center for this type of surgery. In this retrospective study, we reviewed the medical records of all obese individuals who were candidates for bariatric surgery between January of 2006 and December of 2010, with the total number of indi-viduals being 192. Individuals underwent a standardized clinical assessment, which was based on an instrument desig-nated "clinical assessment form for obese patients" (a protocol at the department of bariatric surgery), in which detailed information was obtained on anthropometric parameters, degree of obesity, comorbidities, and pressure levels, among other clinical data and relevant tests, assessed by physicians, nutritionists, and nurses working in that department.

The aim of the medical record review was to systematically collect the following clinical data on and test results for morbidly obese individuals (BMI ≥ 40 kg/m2)(12): (i) anthropometry; (ii) simple spirometry; (iii) M-mode echocardiog-raphy; (iv) reporting of bronchial asthma (diagnosis and/or treatment); (v) reporting of current or former smoking; and (vi) reporting (diagnosis and/or treatment) of systemic arterial hypertension (SAH). Asthma was defined as reporting of a current or prior medical diagnosis. Current or former smoking refers to a longer than 1-year history of smoking, regard-less of the number of pack-years. SAH was defined as a current drug treatment for SAH or at least two arterial blood pressure measurements ≥ 140/90 mmHg. Data on the forms, as well as test results, were only accepted if they had been properly recorded within 1 year before surgery. Only 45 patients met all of the above inclusion criteria, of whom 3 were excluded because of an echocardiographic report of acoustic window impairment caused by obesity and 3 were excluded because they did not meet the spirometry quality criteria. The main reasons for exclusion of the remaining cases were not being diagnosed with morbid obesity (136 individuals) and being a morbidly obese patient with no spirometric data (4 individuals), no echocardiographic data (5 individuals), or neither (2 individuals).

Anthropometric data were obtained by using a stadiometer and a scale for obese individuals, and BMI was calculated by the formula weight/height2 (in kg/m2). Waist circumference values were not collected, since such values were lacking in many cases. The study was approved by the Human Research Ethics Committee of the Federal University of Mato Grosso do Sul and was in compliance with the Declaration of Helsinki.

Spirometry with forced expiratory maneuver was performed in the pulmonary function section of the department of pul-monology of the university. All tests met the acceptability criteria established in the Brazilian guidelines for pulmonary function testing,(13) and values were corrected to body temperature, pressure saturated. All tests were performed with a Vitatrace VT 130 spirometer (Pró Médico Ltda., Rio de Janeiro, Brazil), with individuals in a sitting position and wearing a nose clip. The equipment was always calibrated in the morning, in accordance with the manufacturer instructions, and the tests were always conducted by one of two trained spirometry technicians belonging to the department of pulmonology. At least three acceptable maneuvers were always performed, and instantaneous flow was expressed as that obtained from the one maneuver with the highest sum of FVC (in L) and FEV1 (in L/min). The reference values used were those of Pereira et al.,(14) and the mean SD of the study population was recorded.

Echocardiography was performed by two cardiologists, who used a Nemio 17-2005 echocardiograph (Toshiba, Tokyo, Japan). Those two cardiologists, one of whom is one of the present authors, work specifically in the echocardiography section of the hospital. For the purposes of this study, only data acquired in M-mode were collected; left ventricle end-diastolic volume (LVDV) and LV end-systolic volume (LVSV) were indirectly measured using the Teicholz formula, and LVM was calculated using the formula by Devereux et al.(15) The measurements were obtained from parasternal LV cross-sections at the level of the papillary muscles. Left atrial (LA) dimensions, LV end-diastolic diameter (LVDD), and LV end-systolic diameter (LVSD) were also measured. We used as criteria for LVM indexation both height to the power of 1.7 (LVM/m1.7), which is a criterion recommended for obese individuals, and height squared (LVM/m2). Relative LV posterior wall thickness (RLVPWT) was obtained by dividing LV posterior wall thickness (LVPWT) by LVDD.

The results are expressed as mean  SD or frequency. Our sample size calculation (PASS software, version 11; NCSS LLC, Kaysville, UT, USA) showed that 40 individuals would be enough to provide a power of 80% for a significant correla-tion coefficient of 0.40 at  = 0.05 (FEF25-75/FVC, % vs. LVM/LVPWT/RLVPWT). For multiple linear regression analysis (based on LVM), 40 individuals would be necessary to provide a power of 98% and an r2 = 0.37, in a model with four independent variables (weight, FEV1, FVC, and FEF25-75/FVC, %). The categorical variables reporting of smoking, reporting of asthma, and reporting of SAH were also computed, and gender and reporting of SAH were coded as a binary variable for purposes of statistical adjustment. Correlations between various spirometric and echocardiographic variables were assessed by Pearson's correlation test. Only LVM and LVPWT required log transformation to fit a normal distribution. The relationship between reporting of asthma (diagnosis and/or treatment) or current/former smoking and FEF25-75/FVC, %, below or above the lower limit of the normal range, was assessed by Fischer's exact test. The relationship between FEF25-75/FVC, % and LVPWT/RLVPWT was tested by partial correlation analysis, adjusted for weight, gender, and SAH, which are traditionally the most important determinants of LV hypertrophy in obesity. In order to determine which variable would be the best predictor of LVM (dependent variable), we tested a stepwise multivariate linear regression model, in which the independent variables were only the variables showing a significant correlation (p < 0.05) with LVM, whether indexed or not. For all calculations and graphs, we used the IBM SPSS Statistics software package, version 20.0 (IBM Corp., Armonk, NY, USA). Results were considered significant at the level of p ≤ 0.05.

RESULTS

Of the 45 patients for whom all data were originally available for inclusion, 6 were excluded because of reported fail-ures in M-mode echocardiography or in pulmonary function testing, which did not meet quality criteria. The anthropomet-ric and demographic data of the 39 patients included in the study are shown in Table 1. Females predominated in the study (74.3%), the mean age of the participants was 35.5  7.7 years, and 8 participants were considered super-obese (BMI > 55 kg/m2). Asthma and ever smoking were reported by 7 and 6 individuals, respectively. SAH (diagnosis and/or treatment) was reported to be present in 21 individuals (54%). Only 1 individual reported both asthma and smoking. The main spirometric and echocardiographic parameters are shown in Table 2. The mean spirometric values were above 80% of predicted. The mean values of LA diameter, LVM, and LVM/m2 were increased relative to normal mean values for the Brazilian population.(16)





The various correlations between the echocardiographic and spirometric variables are shown in Table 3. No correlation was found between BMI and any of the spirometric variables studied. Chief among the significant correlations is the weak direct relationship between BMI and the variables LVDD(r = 0.359; p < 0.05), LVSD (r = 0.387; p < 0.05), LVDV (r = 0.387; p < 0.05), and LVSV (r = 0.425; p < 0.01). A moderate inverse correlation was found between FEF25-75/FVC, % and the variables of LV remodeling (Table 3) in the univariate analysis, and this correlation remained statistically significant for LVPWT (r = −0.355; p < 0.05) and RLVPWT (r = −0.349; p < 0.05) even after adjustment for weight, gender, and SAH (Figures 1A and 1B, respectively). The correlation between indexed LVM (in g/m1.7) and FEF25-75/FVC, % was borderline for statistical significance (p = 0.05; Figure 1C). Interestingly, FEF25-75/FVC, % did not correlate with the variables of LV inter-nal diameter or LV volume. No correlation was found between FEF25-75% and any of the echocardiographic variables. Fisch-er's exact test showed no statistically significant association between FEF25-75/FVC, %, below or above the lower limit of the normal range, and reporting of asthma or smoking (p > 0.05 for both).






Stepwise multiple linear regression analysis (Table 4) showed that the variation in LVM among morbidly obese individ-uals is better predicted by FVC (in L), which explained 36.9% (p < 0.0001) of the variation in LVM in the study population. The best predictor of LVM indexed to height squared and LVM indexed to height to the power of 1.7 was FEV1 (in L/min; p < 0.05 for both; Table 4).



DISCUSSION

This retrospective study shows there is an independent association between the relative size of the small airways (FEF25-75/FVC,%) and echocardiographic parameters of ventricular hypertrophy in morbidly obese individuals. In addition, FVC (in L) and FEV1 (in L/min) were found to be important predictors of LVM in grams or indexed to body surface area.

Both LVM and LV internal diameters are increased in obesity, regardless of SAH.(17) In our study, we found no relation-ship of BMI with LVM in grams or indexed to body surface area or with LVPWT, but we found a relationship of BMI with LV internal diameters and LV volumes, which is consistent with the literature. (2,17) This positive association is likely to be due to increased preload and increased cardiac output, causing ventricular dilatation, which could later progress to LV remod-eling.(18)

The literature shows inconsistent associations between BMI and spirometric results, with some studies showing an asso-ciation(19) and others not showing any.(20) This is probably due to differences in gender ratio among studies, since the android type of obesity favors the correlation between BMI and lung function, unlike the gynecoid phenotype, which does not produce excessive accumulation of fat mass in the chest. In our study, females predominated (74%), which partly explains the lack of correlation between any spirometric variable and BMI.

The relationships of FVC, FEV1, and FEF25-75% with LVM and LVPWT have been studied in (non-obese) elderly individuals with cardiovascular disease, and the results differ among studies in regard to the direction of the correlation, with correla-tions being positive(21) or negative,(22) which more strongly reflects loss of lung function associated with advanced age and with the effects of SAH and pulmonary hypertension, as well as with the pulmonary restrictive effects of cardiomeg-aly. One study(4) showed an inverse relationship between LVM and FVC in nonsmoking females and a direct relationship between LVM and FVC in nonsmoking males under 60 years of age. The fact that most of our sample consists of females (74%) suggests that, in morbidly obese individuals, the direction of the correlation may be different for some lung function variables.

FEF25-75/FVC, % is a measure that corrects to some extent for the large variability found in FEF25-75% alone and reflects changes predominantly in the small airways, being adjusted for lung size on the basis of FVC.(17) The correlations of FEF25-75/FVC, % with LVM indexed to body surface area (in g/m1.7) and with LVPWT/RLVPWT, correlations that remained after adjustment for weight, gender, and SAH, possibly reflect the direct mechanical effects of obesity, but may also suggest that there are other independent (inflammatory or lipotoxic) mechanisms.

Since research on the subject is scarce, there is limited evidence that the small airways are independently affected by obesity, as has been reported in nonsmoking males.(23) The hypotheses raised in that study(23) include an increase in blood volume in obese individuals, causing bronchial vessel congestion; the presence of increased levels of very-low-molecular-weight lipoproteins, which could trigger the release of histamine; and altered lipoprotein metabolism in obesi-ty, which could elicit and amplify these effects.

Recent data in the literature also indicate that obesity is characterized by hyperresponsiveness to methacholine, pre-dominantly in the small airways,(24) and that this hyperresponsiveness correlates better with FEF25-75/FVC, %.(25) On this point, a recent study suggests that groups of obese individuals with hyperresponsiveness are associated with greater LVM.(26) Small airway hyperresponsiveness in obese individuals also could be partially explained by dysanapsis (which is assessed indirectly by FEF25-75/FVC, %), a term coined by Green et al.(27) to explain the large interindividual variability in airway size, regardless of lung parenchyma size. An important predictor of LVM, BMI correlated directly with cardiac size and mass in several studies, although lean body mass remains a better predictor of LVM. (2,28,29) This retrospective study found no correlations between BMI and LVM (in grams or indexed to body surface area), which is in agreement with an-other study,(30) and this is possibly due to differences in obesity phenotypes, prevalence of SAH, and number of individu-als studied.

Of note in our study is the fact that FVC (in L) was the best predictor of variation in LVM (in g), explaining 37% of this variation in the study population, which suggests that reduced lung volume may be an important variable in establishing a predictive model for LVM in obese individuals in future studies. In turn, LVM correlates with cardiovascular morbidity and mortality.

Among the limitations of our study is the fact that our sample was small, consisting of candidates for bariatric surgery, was limited by the criterion of including only morbidly obese and super-obese individuals, and was based on criteria that were unclear in the medical charts, such as the diagnosis of asthma or SAH. In addition, data on diabetes were not col-lected, although the relationship between diabetes and LVM is inconsistent in the literature. Other important limitations were the limited acoustic window in the analysis of M-mode echocardiographic variables in obese individuals and the lack of a specific, standardized protocol for M-mode echocardiography, since we did not obtain data on inter-rater agreement for the two echocardiographers. In this regard, because this was a retrospective study, we sought not to use echocardio-graphic data for which accuracy is significantly decreased by the effects of obesity on the acoustic window, such as ejec-tion fraction and Doppler echocardiography data.

We therefore conclude that the small airways in morbidly obese individuals have a correlation with cardiac hypertrophy, regardless of usual anthropometric variables, gender, or SAH. This study reveals that factors other than mechanical and/or hemodynamic limitations imposed by increased body mass may be important in the joint changes seen in the small airways and in cardiac hypertrophy. In addition, further studies are needed to examine the impact that lung function parameters have on predictive equations for LVM in obese individuals.

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