The 6-minute walking test and all-cause mortality in patients undergoing a post-cardiac surgery rehabilitation program.

BACKGROUND: The 6-minute walking test (6mWT) is used to prescribe physical activity in cardiac surgery patients. The clinical value of a pre-discharge 6mWT and its association with outcome is not well defined. DESIGN AND METHODS: We retrospectively analyzed data from 313 patients (age 66 ± 11 years, 23% females, left ventricular ejection fraction (LVEF) 52 ± 11%, Hb 10.5 ± 1.3 g/dl, serum albumin 3.9 ± 0.4 mg/dl) who were admitted to our rehabilitation institute following cardiac surgery. A 6mWT was performed at entry and at discharge and expressed as % of theoretical predicted values calculated on the basis of individual age, height, weight and sex. The endpoint was represented by all-cause mortality. The predictive value of 6mWT was tested in univariate and multivariate analysis. RESULTS: A pre-discharge 6mWT was completed by 284 out of 313 patients. Two patients died in hospital. During a median of 23 months, mortality was 9% (26/284) and 44% (12/27) (p < 0.0001) in patients who did or did not perform the pre-discharge 6mWT. The distance covered at the pre-discharge 6mWT as a continuous variable of % predicted values was a significant predictor of subsequent mortality (Hazard Ratio (HR) 0.97 (95% CI 0.96-0.99), p = 0.0019). After adjustment for all preselected covariates, the pre-discharge 6mWT (HR 0.97 (95% CI 0.95-0.99), p = 0.0038) and LVEF (HR 0.93 (95% CI 0.90-0.96), p < 0.0001) remained significantly associated with the outcome. CONCLUSIONS: In recent cardiac surgery patients, the pre-discharge 6mWT is not only a valid measurement of the impact of cardiac rehabilitation but also provides outcome information offering the possibility to identify patients who may need more intensive follow-up.

Echo-Doppler and clinical evaluations to define hemodynamic profile in patients with chronic heart failure: accuracy and influence on therapeutic management.

BACKGROUND: Correct classification of chronic heart failure (CHF) patients by dual evidence of congestion and adequate perfusion is the primary clinical focus for management. OBJECTIVES: To evaluate the accuracy of echo-Doppler compared with clinical evaluation in determining the hemodynamic profile of patients with CHF; and to compare therapeutic changes based on hemodynamic or echo-Doppler findings. METHODS: Three hundred and sixty-six consecutive CHF patients (ejection fraction 25+/-7%) in sinus rhythm, undergoing evaluation for cardiac transplantation, underwent physical examination prior to right heart catheterization and echo-Doppler studies. Subsequently, patients were randomized to therapeutic optimization using either right heart catheterization or echo-Doppler data. The end-points were: identification of low cardiac output (cardiac index <2.2 l/min/m(2)); high pulmonary wedge pressure (PWP >18 mm Hg); high right atrial pressure (RAP >5 mm Hg) and analysis of therapeutic changes made in response to the right heart catheterization and echo-Doppler studies. RESULTS: Echo-Doppler showed better accuracy in estimating abnormal hemodynamic indices than clinical variables (cardiac index <2.2 l/min/m(2): echo positive predictive accuracy (PPA) 98% vs. clinical PPA 52% p<0.00001; PWP >18 mm Hg: echo PPA 85% vs. clinical PPA 76% p=0.0011; RAP >5 mm Hg: echo PPA 82% vs. clinical PPA 57% p<0.00001). When applied to individual patients, the echo-Doppler assessment was more accurate than clinical evaluation in defining the different hemodynamic profiles: wet/cold (89% vs. 13%, p<0.0001); wet/warm (73% vs. 30%, p<0.0001); dry/cold (68% vs. 12%, p<0.0001); dry/warm (88% vs. 51%, p<0.0001). Therapeutic decision-making based on echo-Doppler findings was similar to that based on hemodynamics. CONCLUSION: Echo-Doppler hemodynamic monitoring proved accurate in estimating hemodynamic profiles and influenced therapeutic management.

Anemia in chronic heart failure patients: comparison between invasive and non-invasive prognostic markers.

BACKGROUND: The prognosis of chronic heart failure (CHF) remains poor despite advances in medical management. Several different variables determine prognosis. Recently anemia has emerged as an independent prognostic variable in the evaluation of CHF. It is therefore important to analyze the role of anemia in patients with mild to severe CHF already well characterized by hemodynamic, echo-Doppler, and cardiopulmonary exercise testing. OBJECTIVE: We performed this study to evaluate, in a large general cohort of CHF patients, the frequency of anemia and its correlation with their clinical profile. We assessed the prognostic value of anemia in relation to other known prognostic variables. METHODS: Two-dimensional echocardiography, right heart catheterization, cardiopulmonary tests and laboratory examinations were performed in a population of 980 consecutive patients with CHF (53 +/- 9.4 years, 85% male, LVEF 25 +/- 8%; 45% with NYHA class III-IV). A hemoglobin (Hb) concentration less than 12 g/dl was used to define anemic patients. The primary end point was cardiac death or urgent heart transplantation. RESULTS: Nineteen percent of patients were anemic. These patients had a lower body mass index (24 +/- 3 vs. 25 +/- 4 Kg/m2 p < 0.0004), a worse functional class (64% were in NYHA class III-IV vs 41% in the non-anemic group, p < 0.0001), poorer exercise capacity (12.4 vs. 14.8 ml/kg/min peak VO2, p < 0.0001) and increased right (7 +/- 5 vs. 5 +/- 4 mmHg, p < .0004) and left (21 +/- 9 vs. 19 +/- 10 p < 0.007) ventricular filling pressures. During a 3-year follow-up cardiac deaths occurred in 236 (24%) and 52 (5%) of patients received an urgent heart transplant. On univariate regression analysis anemia was significantly correlated with these "hard" cardiac events (39% of anemic patients vs 27% of non-anemic patients). By multivariate logistic regression analysis different prognostic models were identified using non-invasive, with or without peak VO2, or invasive parameters. The prognostic model including anemia (AUC(ROC): 0.720) showed similar accuracy in predicting cardiac events to other prognostic models with peak VO2 (AUC(ROC): 0.719) or invasive variables (AUC(ROC): 0.719). CONCLUSIONS: The present study demonstrates that anemia in CHF patients is associated with prognosis, worse NYHA functional class, exercise capacity and hemodynamic profiles. The relationship between anemia and mortality is independent of other simple non-invasive prognostic factors. Prognostic models with more complex or invasive independent predictors did not increase the accuracy to predict cardiac mortality or the need for urgent transplantation.

An organizational model to translate nutritional recommendations into routine clinical practice in secondary prevention of coronary artery disease.

BACKGROUND: We hypothesized that nutritional risk factors can be reduced routinely in all patients with coronary artery disease (CAD) by modifying general hospital catering into "antiatherogenic catering" and providing patients with an education program. METHODS: General nutritional rules were applied to transform the standard alimentary regimen of our catering service (lipids 30% energy) into antiatherogenic catering (lipids 20% energy). The educational program (EP) consisted of a nutritional manual and 4 h/week of lessons. Eighty male patients (pts) with CAD (54 +/- 13 years), 10 +/- 4 days after an acute coronary event, were randomly allocated by cardiologists to a lipids 30% energy (control group = 40 pts) or to a lipids 20% energy diet (previously deposited in our catering service) + EP (treatment group = 40 pts). Serum total cholesterol (T-Chol), HDL- (HDL-Chol), LDL- (LDL-Chol), triglycerides (Trig), and body mass index (BMI) were determined before and after the 21-day treatment. RESULTS: Lipids 20% energy reduced T-Chol (P < 0.001), LDL-Chol (P < 0.001), and Trig (P < 0.05), while lipids 30% worsened T-Chol and LDL-Chol. The changes in the lipid parameters resulted in significant differences between the two groups. CONCLUSIONS: Simple reorganization of hospital catering and an educational program may routinely reduce nutritional risk factors in CAD patients, without individual counseling by the nutrition team.