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Arq. Bras. Cardiol. vol.98 no.4 São Paulo Apr. 2012 Epub Mar 27, 2012
Irlaneide da Silva TavaresI,III; Antonio Carlos Sobral SousaI; Raimundo Sotero Menezes FilhoII; Manuel Hermínio de Aguiar-OliveiraI; José Augusto Barreto-FilhoI; Amanda Ferreira de BritoI; Joselina Luzia Menezes OliveiraI
IUniversidade Federal de Sergipe, Aracaju, SE Brazil
IIDIMESE, Aracaju, SE Brazil
IIIHospital do Coração de Aracaju, Aracaju, SE Brazil
BACKGROUND: Obesity is a chronic and multifactorial disease, associated with increased cardiovascular risk, especially diastolic heart failure.
OBJECTIVE: To evaluate left ventricular diastolic function in morbidly obese patients in the pre-operative for bariatric surgery, correlating it with cardiovascular risk factors and heart structure.
METHODS: This is a cross-sectional study with 132 patients eligible for bariatric surgery submitted to transthoracic echocardiography assessment and of cardiovascular risk factors, as follows: 97 women (73.5%), mean age 38.5 ± 10.5 years and BMI of 43.7 ± 7.2 kg / m². Patients were divided into three groups: 61 with normal diastolic function, 24 with mild diastolic dysfunction and 47 with moderate/severe diastolic dysfunction, of which 41 with moderate diastolic dysfunction (pseudonormal pattern) and six with severe diastolic dysfunction (restrictive pattern).
RESULTS: Hypertension, age and gender were different in the groups with diastolic dysfunction. Groups with dysfunction had higher left atrial diameter, left ventricular diameter, left atrial volume in four and two chambers, left atrial volume index and left ventricular mass index corrected for body surface area and height.
CONCLUSION: The high frequency of left ventricular diastolic dysfunction in the preclinical phase in morbidly obese patients justifies the need for careful echocardiographic assessment, aiming at identifying individuals at higher risk, so that early intervention measures can be carried out.
Keywords: Obesity morbid; heart failure; preoperative care; bariatric surgery.
Obesity is a chronic and multifactorial disease, which represents a high risk for health1. It is a public health problem that has reached epidemic proportions in adults and children2. It is often associated with conditions that increase cardiovascular risk3, including: dyslipidemia, systemic arterial hypertension (SAH), glucose intolerance, left ventricular hypertrophy (LVH), hyperuricemia, elevated fibrinogen, metabolic syndrome (MS) and sleep apnea (SA). Obese individuals have a 104% increase in the risk of developing heart failure (HF) compared with nonobese ones4. The centripetal distribution of body fat is associated with higher concentrations of plasma lipoprotein levels and blood pressure in both sexes, regardless of the amount of body fat5.
Hemodynamic, structural and cardiovascular function alterations may be due to excess weight6. The impairment in left ventricular relaxation is one of the effects of obesity on left ventricular function, regardless of the existence of other comorbidities7. The presence of diastolic dysfunction of the left ventricle (LV), in the general population, is associated with the development of HF and shorter survival8.
The high prevalence of obesity, increased risk of Diastolic Heart Failure (DHF), the frequent association with comorbidities that increase cardiovascular risk and the fact that it is an independent and modifiable risk factor for the development of several diseases, require a thorough echocardiography investigation in obese individuals, respecting their peculiarities, in order to identify patients at higher risk, so that intervention measures can be carried out early.
To date, we are unaware of publications that investigated morbidly obese patients according to the criteria of the recommendations for quantifying cardiac chambers9 and diastolic dysfunction10, so the aim of this study is to assess left ventricular diastolic function in morbidly obese patients that are candidates to bariatric surgery, according to these guidelines, associating cardiovascular risk factors and cardiac structure.
The study was carried out in the Cardiology Clinic of Hospital Universitário da Universidade Federal de Sergipe and in a private institution in Aracaju, Hospital do Coração, both in the state of Sergipe, Brazil, from August 2009 to October 2010. This is a cross-sectional and analytical study, with a convenience sample of morbidly obese patients concomitantly referred for preoperative evaluation for bariatric surgery. Patients with inadequate echocardiographic windows and the following diseases: established atherosclerosis, higher-than-mild degree of valvular disease, presence of prosthetic valve, pericardial disease, atrial fibrillation, frequent extrasystoles, ventricular systolic dysfunction, hyperthyroidism and hypothyroidism were excluded.
To identify the profile of the studied population a semistructured interview was developed at the clinical assessment. An individual was considered to be a smoker if he/she had smoked at least one cigarette over the past thirty days and those who performed less than 30 minutes of physical activity, three times a week were considered sedentary. Abdominal circumference measurement was performed with the patient standing at the end of expiration, in the midpoint between the lower margin of the last palpable rib and the top of the anterosuperior iliac crest using an inelastic tape in the horizontal position11. BMI12 (BMI: weight/height²) and body surface area13 [BS: w 0.425 x h 0.725 x 71.84 x 104] were also calculated.
Blood pressure measurement followed the recommendations of the Brazilian Society of Hypertension14, which defines hypertension as systolic blood pressure > 140 mmHg and / or diastolic blood pressure > 90 mmHg, or use of antihypertensive medication; heart rate was obtained with the patient in the sitting position, after five minutes of rest, by counting the heartbeats in 60 seconds using the radial pulse. To detect diabetes, we followed the recommendations of the American Diabetes Society15; for dyslipidemia, we followed the recommendations of the IV Brazilian Guidelines on Dyslipidemia16 and for the characterization of MS, we followed the criteria of the First Brazilian Guideline for the Diagnosis and Treatment of Metabolic Syndrome11.
All echocardiograms were performed by an experienced professional, using a TOSHIBA echocardiography device, model Istyle or GE device model Vivid 3, with a 2.5 MHz sectorial transducer, obtaining second harmonic images with 100 mm/s scanning, using one-dimensional, two-dimensional and Doppler (pulsed, color and tissue) echocardiography in the parasternal (longitudinal and transverse) and apical (two, four and five chambers) windows. The average of three measurements was used for each variable. The assessment of cardiac chamber dimensions and LV systolic and diastolic functions was based on the recommendations of the American Society of Echocardiography9,10.
The following echocardiographic variables were analyzed: cardiac dimensions (aorta, left atrium, left ventricle during systole and diastole, interventricular septum and posterior wall), percentage of systolic shortening (%), ejection fraction (LVEF), left ventricular mass index indexed to body surface area in g/m2 (LVMIbs) and for height in g/m (LVMIh), left ventricular geometric pattern, two and four-chamber left atrial volume (LAV2c and LAV4c) and indexed for body surface area (LAVi - ml/m²), velocities (cm/sec) of E and A mitral flow waves, velocity of E and A waves of the septal and lateral annulus of the mitral valve, E/A and E/e ratios, isovolumetric relaxation time (IVRT) (ms), deceleration time (DT) (ms), duration (ms) of A wave (Adur), velocity (cm/s) and duration (ms) of the pulmonary atrial reversal flow (Ar and Ardur), relation (ms) of the duration of the atrial reversal flow subtracted from the duration of A wave of the mitral flow (Ardur - Adur), velocity (cm/s) of the systolic (S) and diastolic (D) wave of the pulmonary flow and S / D ratio.
The size of the aorta and left atrium were evaluated using one-dimensional mode (Mode M) in the longitudinal parasternal view. Measurements of end-systolic and end-diastolic diameters, septal and LV posterior wall thickness were performed in the parasternal transversal view. Atrial volume was measured by Simpson's method, left ventricular ejection fraction by Teichholz formula17, using M-mode and LV mass was calculated using the modified Deveraux formula18: 0·80 (1·04 [(IVST+PWT+LVED)3- LVED3]+0.6 g, and the relative wall thickness (RWT) was calculated by the ratio of twice the posterior wall divided by the left ventricular diastolic diameter9 (RWT = 2PP/DD).
The characterization of the left ventricular geometric pattern was considered as mass related to height9, and a normal pattern was considered when mass and RWT were normal, concentric remodeling when there was normal mass and high RWT, concentric hypertrophy when both mass and RWT were high and eccentric hypertrophy when mass was high and RWT was normal.
Diastolic dysfunction was considered when the velocities of septal e < 8 cm / and lateral < 10 cm/s. It was classified as mild when E / A <0.8, DT> 200 ms, E/e < 8 and Ardur - Adur < 0 ms; as moderate when E/A = 0.8 to 1.5, DT = 160-200 ms, E/e > 13 and Ardur Adur > 30 ms; and as severe when E/A> 2, DT < 160, E/e > 13 and Ardur - Adur < 30 ms10.
The 132 patients were divided into three groups according to LV diastolic function: normal (N), mild diastolic dysfunction (mild DD) and moderate or severe diastolic dysfunction (M/S DD). The inclusion of patients with a restrictive pattern in the third group was due to their small number (six patients).
For statistical calculations, we used the SPSS (Statistical Package for Social Sciences) release 18.0. Numerical variables were described as mean and standard deviation and categorical variables as simple and relative frequencies. The Shapiro-Wilk test was used to evaluate the assumption of normality. To test hypotheses related to categorical variables the Chi-square test or Fisher's exact test was used when appropriate.
The comparison between the groups (N vs. mild DD vs. M/S DD) was carried out using the general linear model with one factor (ventricular dysfunction), adjusting for the variables. Confidence level was 0.05 for the α error, with a power of 0.80, and the tests were assumed to be two-tailed. For the analysis of factors associated with the outcome variable (presence of diastolic dysfunction) the forward stepwise logistic regression method was used, considering p = 0.25 for entering the model and p = 0.05 for remaining in the same model; simple and adjusted odds ratio were also calculated.
The study was approved by the Ethics Committee in Research of Universidade Federal de Sergipe (UFS) (CAAE-0121.0.107.000-09) and all participants signed a free and informed consent form.
The sample consisted of 132 patients, of which 97 (73.5%) were females, resulting in a ratio of 2.7 women for each man. The mean age was 38.5 ± 10.5 years and ranged from 16 to 62 years. The mean BMI was 43.7 ± 7.2 kg/m² and ranged from 35.2 to 71.2 kg/m². Forty-eight (36.4%) patients had class II obesity, and 84 patients (63.6%) had grade III obesity. The frequency of LVDD was 53.8% (71 patients), and M/S DD was more frequent than the mild one. The comparative analysis of the clinical and anthropometric variables that showed significant differences between groups were: age, gender and waist circumference (Table 1).
Patients with mild DD and M/S DD were older and had significantly higher mean SBP (p <0.001) than group N. Regarding the waist circumference, the M/S DD group showed higher mean values (p = 0.02) than group N. There was a positive association between abdominal obesity and degree of LVDD (Figure 1).
With regard to cardiovascular risk factors (CVRF), it was observed that mild DD and M/S DD groups had significantly more diabetes (p <0.0001), hypertension (p <0.0001) and MS (p <0.001) when compared to N, without, however, showing any difference between them (Table 2). Among the cardiovascular risk factors, only age, gender and hypertension were independently correlated with the presence of DD at the multivariate analysis.
The echocardiographic variables (LAD, LVDD, LAV4c, LAV2c, MLAV, LAVi, and LVMIbs, LVMIh) showed significantly higher values in groups with DD when compared to N (Table 3). There is also a linear trend of increasing severity between these variables and diastolic dysfunction, as shown in Figure 2. As for the LA dimensions, it was also possible to discriminate the two groups with DD. The LV mass index indexed for height was also higher in patients with DD; however, only the group M/S DD showed to be statistically different (p <0.001) from group N (Table 3).
Left ventricular hypertrophy was diagnosed in 20% of the sample when the mass was indexed for body surface, and 55.3% when indexed for height. The geometric pattern showed the following distribution when the LV mass was indexed for body surface area and height, respectively: normal in 102 (77.3%) and 58 (43.9%), concentric remodeling in 1 (0.8%) and concentric hypertrophy in 7 (5.3%) for both and eccentric hypertrophy in 22 (16.7%) and 66 (50%) patients. There was a significant association between the eccentric geometric pattern (p = 0.03) with the presence of diastolic dysfunction and a higher prevalence of that in the mild (62.5%) and M/S (50.9%) DD groups when compared to group N.
The findings of the present study show a predominance of female patients, which seems show a greater demand for treatment among women. Regarding age, the data are similar to that from other studies19-22, such as a study by Matos et al23 of 50 patients, 10 men and 40 women that reported a BMI of 40 to 81.7 kg/m2 (mean 52.2 ± 9.2 kg / m²) and age between 18 and 56 years (mean 38, 5 ± 9.7). As for the BMI, there was a similar result in a study by Okawa24, with 104 morbidly obese patients at the pre-operative period of bariatric surgery, which showed an average BMI of 42.8% ± 5.45 kg / m².
When left ventricular diastolic function was assessed, there was a reduction in diastolic function in 53.8% of patients, a fact which is not common in the young age group as in this sample, aged 38.5 years (± 10.5). Okawa's study24 with 104 morbidly obese patients, found 62.4% of diastolic dysfunction, while another study by Rocha et al25 found in 30 patients in the preoperative period for bariatric surgery, 54.6% of diastolic dysfunction. Studies on the prevalence of diastolic dysfunction in obese diabetic patients showed a prevalence of 47% when using mitral flow26; Boyer et al27, when associated flow propagation and color M-mode tissue Doppler to mitral flow analysis, found a prevalence of 75% of LV diastolic dysfunction, and tissue Doppler detected diastolic dysfunction in 63% of patients.
Regarding dysfunction severity, there was a predominance of moderate diastolic dysfunction, probably to the detriment of the restrictive pattern due to the diagnostic criteria used, characterizing this pattern when all variables were altered together (E/A> 2, DT < 160 ms, E/e ' > 13 and Ar - A < 30 ms).
In relation to left ventricular systolic function, which was an exclusion criterion, none of the patients referred for evaluation had systolic dysfunction. Several studies in obese subjects28-32 have shown preserved systolic function, and systolic dysfunction was found only in obese patients who had been so for a long time. The LV ejection fraction is a reliable index, but can be within normal limits even though there are significant compensatory changes in contractile state.
SAH is the most prevalent comorbidity when measured alone. Several authors have described the association between BMI and higher prevalence of MS, indicating that obesity is related to an unfavorable risk profile for cardiovascular disease. Similar data were found in other studies that showed hypertension as the most frequent isolated comorbidity20,21. A similar result was observed by Costa et al32, with a prevalence of SAH of 63.4% among 252 morbidly obese patients. The presence of DM occurred in 25.2% of patients, similar to the 26% rate found by Rocha e Silva et al25.
It was demonstrated that the greater left atrial volume, the worse the diastolic function, proving the theory that this is a sensitive index that expresses the severity of LV diastolic dysfunction33. Left ventricular hypertrophy was more often diagnosed when the LVM criterion was indexed for height (73 patients = 55.3%) than for body surface area (29 patients = 22%), even when following the recent guidelines from the American Society of Echocardiography in that the cutoff for left ventricular mass is greater when indexed for height9. The LV geometric patterns found in this study were in agreement with other authors7,28,34,35, with eccentric LVH being the most common geometric abnormality, regardless of whether the mass index is related to the height or body surface. The concentric remodeling, associated with decreased cardiac index, elevated peripheral vascular resistance and reduced circulating plasma volume36 was observed in only one (0.7%) case, confirming the pathophysiological model proposed for severe obesity, in which the circulating volume is high and peripheral resistance is normal or low.
To prevent measurement bias, patients were evaluated by a single observer and three consecutive echocardiographic measurements were recorded for each variable; selection bias was minimized by the fact that it was not random, with the evaluation of consecutive patients; as for sampling bias, it is believed that the sample is representative of the morbidly obese population in the preoperative period for bariatric surgery (patient from the public health system and from a private practice).
Obesity is associated with high frequency of left ventricular diastolic dysfunction and changes in cardiac structure, including increased left atrial volume in the pre-clinical phase in morbidly obese patients. These data justify the need for careful echocardiographic assessment using the combined analysis of all available echocardiographic techniques, aiming at identifying individuals at greater risk, so that early intervention measures can be adopted.
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Mailing Address: Manuscript received August 29, 2011; revised manuscript received August
29, 2011; accepted December 27, 2011.
Irlaneide Da Silva Tavares
Rua Gerson dos Santos, 08 - Residencial Parque dos Coqueiros â Inácio Barbosa
49040-293 â Aracaju, SE â Brazil
Manuscript received August 29, 2011; revised manuscript received August 29, 2011; accepted December 27, 2011.