Valentina Guida

Azienda Ospedaliera Niguarda Ca' Granda, Milano, Lombardy, Italy

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Publications (3)9.72 Total impact

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    ABSTRACT: BACKGROUND: NT-proBNP has been associated with prognosis in acute decompensated heart failure (ADHF). Whether NT-proBNP provides additional prognostic information beyond that obtained from standard clinical variables is uncertain. We sought to assess whether N-terminal pro-B-type natriuretic peptide (NT-proBNP) determination improves risk reclassification of patients with ADHF and to develop and validate a point-based NT-proBNP risk score. METHODS: This study included 824 patients with ADHF (453 in the derivation cohort, 371 in the validation cohort). We compared two multivariable models predicting 1-year all-cause mortality, including clinical variables and clinical variables plus NT-proBNP. We calculated the net reclassification improvement (NRI) and the integrated discrimination improvement (IDI). Then, we developed and externally validated the NT-proBNP risk score. RESULTS: One-year mortalities for the derivation and validation cohorts were 28.3% and 23.4%, respectively. Multivariable predictors of mortality included chronic obstructive pulmonary disease, estimated glomerular filtration rate, sodium, hemoglobin, left ventricular ejection fraction, and moderate to severe tricuspid regurgitation. Adding NT-proBNP to the clinical variables only model significantly improved the NRI (0.129; p=0.0027) and the IDI (0.037; p=0.0005). In the derivation cohort, the NT-proBNP risk score had a C index of 0.839 (95% CI: 0.798-0.880) and the Hosmer-Lemeshow statistic was 1.23 (p=0.542), indicating good calibration. In the validation cohort, the risk score had a C index of 0.768 (95% CI: 0.711-0.817); the Hosmer-Lemeshow statistic was 2.76 (p=0.251), after recalibration. CONCLUSIONS: The NT-proBNP risk score provides clinicians with a contemporary, accurate, easy-to-use, and validated predictive tool. Further validation in other datasets is advisable.
    International journal of cardiology 02/2013; · 6.18 Impact Factor
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    ABSTRACT: Background The ADHF/NT-proBNP score is a validated risk scoring system that predicts mortality in hospitalized heart failure patients with a wide range of left ventricular ejection fractions (LVEF). We sought to assess discrimination and calibration of the score when applied to patients with advanced decompensated heart failure (AHF). Methods We studied 445 patients hospitalized for AHF, defined by the presence of severe symptoms of worsening HF at admission, severely depressed LVEF, and the need for intravenous diuretics and/or inotropes. The primary outcome was cumulative (in-hospital and postdischarge) and postdischarge 1-year mortality. Separate analyses were performed for patients aged ≤70 years. A Seattle Heart Failure Score (SHFS) was calculated for each patient discharged alive. Results During follow-up, 144 (32.4%) patients experienced death and 69 (15.5%) heart transplantation (HT) or ventricular assist device (VAD) implantation as a first event. After accounting for the competing events VAD and HT, the ADHF/NT-proBNP score’s C-statistic for cumulative mortality was 0.738 in the overall study cohort and 0.771 in patients aged ≤70 years. The C-statistic for postdischarge mortality was 0.741 and 0.751, respectively. Adding prior (≤6 months) hospitalizations for HF to the score increased the C-statistic for postdischarge mortality to 0.759 in the overall cohort and 0.774 in patients ≤70 years. Predicted and observed mortality rates by quartiles of score were highly correlated. The SHFS demonstrated adequate discrimination but underestimated risk. The ADHF/NT-proBNP risk calculator is available at: http://www.fsm.it/fsm/file/NTproBNPscore.zip. Conclusions Our data suggest that the ADHF/NT-proBNP score may efficiently predict mortality in patients hospitalized with AHF.
    The Journal of heart and lung transplantation: the official publication of the International Society for Heart Transplantation 01/2013; · 3.54 Impact Factor
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    ABSTRACT: The mid- and long-term outcome of revascularization procedures is still uncertain in patients with chronic left ventricular systolic dysfunction due to coronary artery disease. The identification of dysfunctional myocardial segments with residual viability that can improve after revascularization is pivotal for further patient management. Hibernating myocardium (chronically dysfunctional but still viable tissue) can be identified by positron emission tomography and cardiac magnetic resonance and its presence and extent can predict functional recovery after revascularization. Before beta-blockers were introduced as routine care for heart failure, surgical revascularization appeared to improve survival in these patients. Nowadays, novel medical treatments and devices such as cardiac resynchronization therapy and implantable cardioverter-defibrillators have improved prognosis of these patients and their use is supported by a number of clinical trials. A recently concluded randomized trial, the STICH (Surgical Treatment for Ischemic Heart Failure) trial, has assessed the prognostic benefit derived from revascularization added to optimal medical therapy in patients with ischemic left ventricular dysfunction. This is an overview of the pathophysiological mechanisms as well as the main clinical studies and meta-analyses that have addressed this issue in the past four decades. Furthermore, a brief proposal for a randomized trial to assess effect on prognosis of revascularization of hibernating myocardium will be presented.
    Giornale italiano di cardiologia (2006) 02/2012; 13(2):102-9.