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Biomedical subjects

Simona Sarzi Braga

Publications and source records attributed to Simona Sarzi Braga.

7 recordsLinked to original sources
PubMed2006

Atrial fibrillation in heart failure patients: prevalence in daily practice and effect on the severity of symptoms. Data from the ALPHA study registry.

BACKGROUND: Estimates of the prevalence of atrial fibrillation (AF) in heart failure (HF) originate from patients enrolled in clinical trials. AIMS: To assess the prevalence and clinical correlates of AF among HF patients in everyday clinical practice from HF patients screened for the T-wave ALternans in Patients with Heart fAilure (ALPHA) study; to investigate the correlation between AF and functional status. METHODS AND RESULTS: Consecutive patients (N=3513) seen at nine Heart Failure Clinics were studied; 21.4% were in AF. AF prevalence was greater with increasing age (OR 1.04/year, p<0.001) in non-ischaemic cardiomyopathy (OR 2.34, p<0.001) and with increasing NYHA class (p<0.0001). Multiple logistic regression predictors of AF were age >70 years (OR 2.35), NYHA class II III or IV vs class I (OR 1.8, 4.4 and 3.1) and non-ischaemic cardiomyopathy (OR 3.2). A logistic model indicated that AF was associated with a 2.5 OR of being in NYHA class III-IV vs I-II while accounting for age, gender, left ventricular ejection fraction (LVEF), and aetiology of HF. CONCLUSIONS: The prevalence of AF in HF patients exceeds 20%, and increases with age and functional class. The presence of AF leads to a more severe NYHA class, indicating that AF contributes to the severity of heart failure.

Adolescent↗
PubMed2006

Mixed cranial nerve neuroma revealing itself as baroreflex failure.

We report here the first case of baroreflex failure due to a mixed cranial nerve neuroma in which the clinical manifestations (recurrent severe hypertensive crisis, hypotension) due to baroreflex arc impairment preceded the clinical diagnosis of brain tumour and neurosurgery by a few months. Given the clinical suspicion of baroreflex failure, even in the absence of iatrogenic clues, we propose that the patient's study should include neuroradiologic evaluation of the ponto-cerebellar angulus.

Acute Disease↗
PubMed2005

Non-invasive sudden death risk stratification.

Most sudden cardiac deaths are caused by fatal ventricular arrhythmias (ventricular tachycardia [VT] and fibrillation) in patients with and without known structural heart diseases. Given the large number of patients potentially at risk for developing ventricular arrhythmias, any strategy for treating them prophylactically requires efficient and effective risk stratification. Both non-invasive and invasive testing may be used for prognostic evaluation of patients with heart diseases. The optimal way to use them in the risk stratification for sudden cardiac death will depend in part on the goals of screening. At present risk markers perform better at identifying low-risk patients who may not need an implantable cardioverter-defibrillator (ICD), because all tests have a high negative predictive accuracy. In our opinion an electrophysiological test should not be performed and an ICD should not be implanted in post-myocardial infarction patients with moderate left ventricular dysfunction (left ventricular ejection fraction 30-40%) with a preserved autonomic balance and without non-sustained VT. In MADIT II-like patients electrophysiological testing does not seem necessary and an ICD could not be implanted only in patients with a negative T-wave alternans test. Most of the data available refer to patients with ischemic cardiomyopathy but the preliminary data on T-wave alternans suggest its usefulness in patients with non-ischemic cardiomyopathy too, although a large definitive study has not yet been completed in this important population.

Baroreflex↗
PubMed2004

T wave alternans is a predictor of death in patients with congestive heart failure.

Few data are available about the prognostic role of T wave alternans in patients with congestive heart failure. To assess the ability of T wave alternans, used alone or in combination with other risk markers, to predict cardiac death in decompensated patients, we enrolled 46 patients, mean age 59+/-9, males 89%, ischemic etiology 61%, NYHA class III 35%, left ventricular ejection fraction 29+/-7%. After 1.6 years follow-up, seven patients died from cardiac death (16%), non-sudden in six (86%) and sudden in one (14%). T wave alternans was positive in 24 (52%), negative in 13 (28%), indeterminate in nine patients (20%). T wave alternans was positive in all patients with events (100%) but only in 16 of 37 patients without (41%) (P=0.02). Other predictors of cardiac death were O(2) consumption at the peak of exercise (P=0.03), standard deviation of all NN intervals (P=0.05) and Wedge pressure (P=0.03). When receiver operator characteristics curves were calculated, the highest area (0.73) was found for O(2) consumption at the peak of exercise considering the single variables and for O(2) consumption at the peak of exercise plus T wave alternans (0.79) for combination of them; the comparison of the two receiver operator characteristics curves did not reach statistical difference (P=0.5). In conclusion, this is the first study reporting that T wave alternans can predict cardiac death, with a marginal additional prognostic power when used in combination with measurement of O(2) consumption at the peak of exercise.

Chi-Square Distribution↗
PubMed2002

[T-wave alternation: a new method for identifying patients at risk of malignant ventricular tachyarrhythmia].

T wave alternans (TWA) is a change, in the microvolt range, of T wave amplitude on ABABAB sequence. TWA depends on heart rate, being optimally analyzed at a target frequency of 110 b/min. Initial studies used atrial pacing to reach the target frequency and reported a sensitivity and specificity of 89% for TWA in predicting tachyarrhythmic events. Subsequently, similar results were obtained using ergometric test to reach the target frequency, a less invasive and more "physiologic" approach to increase heart rate. This method became therefore the elective system to increase heart rate in order to evaluate the presence of TWA by means of spectral analysis. At present, various groups of high arrhythmic risk patients have been evaluated, including those with a recent myocardial infarction, congestive heart failure, implantable cardiac defibrillator and clinical indication to programmed ventricular stimulation. In all clinical conditions analyzed, TWA analysis demonstrated a good diagnostic accuracy, suggesting a possible clinical use of the test in these settings.

Electrocardiography↗