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Biomedical subjects

A Rolli

Publications and source records attributed to A Rolli.

At least 19 recordsLinked to original sources
PubMed2000

Arrhythmic risk stratification of post-myocardial infarction patients.

Post-myocardial infarction risk stratification, especially arrhythmic risk stratification, is an issue that has still not been wholly addressed in modern clinical cardiology. In the past 10 years, arrhythmic risk stratification has been approached mainly by evaluating frequency and complexity of premature ventricular contractions, detected on Holter monitoring, often in association with determination of percent ejection fraction. This methodology has been proven to be limited and fallacious according to the Cardiac Arrhythmia Suppression Trial I and II (CAST I,II) results, in which suppression of premature ventricular contractions or premature ventricular beats throughout by antiarrhythmic drugs resulted in an increase in both cardiac and arrhythmic mortality. Only amiodarone as an antiarrhythmic drug, as proven in the recent European Myocardial Infarct Amiodarone Trial (EMIAT) and Canadian Amiodarone Myocardial Infarction Trial (CAMIAT), was effective in reducing arrhythmic mortality without affecting cardiac mortality, in patients selected mainly because of a reduced ejection fraction, with and without premature ventricular contractions. Conversely, it is well known that beta-blockers are effective in preventing sudden death in post-acute myocardial infarction (AMI) patients, thus reducing cardiac and arrhythmic mortality. Conversely, in other institutions, risk stratification in post-AMI patients has been performed by electrophysiologic study obtained, without any previous noninvasive arrhythmic risk stratification, in all post-AMI patients. In recent years, many other noninvasive electrocardiology parameters, such as late potentials (signal-averaged electrocardiography), heart rate variability, baroreflex sensitivity, and, more recently, T-wave alternance, have been shown to be useful, but they are associated with a low specificity in the noninvasive identification of patients at high risk for arrhythmic mortality. Conversely, in the Multicenter Automatic Defibrillation Implantation Trial (MADIT), electrophysiology confirmed that inducibility of ventricular tachycardia shows high specificity and a high predictive value for arrhythmic events. Nevertheless, the MADIT study population is not comparable to a cohort of consecutive patients who have recently had a myocardial infarction. In this setting, the highest risk of arrhythmic events can be observed in patients with depressed percent ejection fraction (< 35%) and in the first 6 months after AMI. Today, the most convincing approach seems to be the one combining both noninvasive risk stratification parameters (e.g., premature ventricular beats > 10/h or reduced heart rate variability < 70 ms or a positive signal-averaged electrocardiogram) followed by a further arrhythmic risk stratification, obtained through electrophysiologic study. Several published and ongoing trials that utilize various arrhythmic risk stratification techniques as part of their protocol are reviewed.

Amiodarone↗
PubMed2000

Stent-graft treatment of a common carotid artery pseudoaneurysm.

PURPOSE: To report a case demonstrating successful endovascular treatment of a right common carotid artery pseudoaneurysm using a commercially prepared balloon-expandable covered stent. METHODS AND RESULTS: A 50-year-old man was evaluated for syncopal episodes. He had a history of severe trauma sustained in a motor vehicle accident 3 years before symptom onset. Doppler ultrasound scanning detected a pseudoaneurysm at the origin of the right common carotid artery. The defect measured 25 mm x 20 mm with a 22-mm-long neck on angiography and computed tomography; there was no evidence of carotid stenosis or associated vascular pathology. Via a percutaneous femoral access, 2 Jostent peripheral stent-grafts were placed at the level of the aneurysm, safely achieving complete repair of the arterial wall defect. The patient was asymptomatic at his 12-month evaluation. Color flow duplex scans showed continued exclusion of the pseudoaneurysm. CONCLUSIONS: Wide-necked aneurysms in the extracranial carotid arteries may be treated with stent-grafts, which can achieve complete and permanent reconstruction of the arterial wall by excluding the aneurysm.

Aneurysm, False↗
PubMed1999

Prospective clinical evaluation and follow-up of a cohort of consecutive VT/VF patients, using a staged-care protocol, including coronary arteriography, programmed electrical stimulation and cardiac surgery.

The prospective evaluation and follow-up of 39 consecutive subjects with VT/VF, 6 of whom, with cardiac arrest (CA), are reported. Patients were enrolled in a specific staged-care approach protocol, which included coronary arteriography (CAR) and ventriculography (VC), in order to exclude the need of cardiac surgery, including coronary artery bypass graft (CABG), with and without left ventricular aneurysmectomy (LVA). The protocol included inducibility of VT/VF, which was verified by programmed electrical stimulation (PES) in control conditions and after antiarrhythmic therapy (ADT), to assess persistent inducibility and mainly to verify the hemodynamic sequelae of VT. VT that showed poor hemodynamic tolerance was treated with ICD, while well-tolerated VT was treated by ADT or ablation when indicated. Furthermore, PES was obtained after surgical procedures. As a first step, the patients were assigned to receive amiodarone (AMIO) (200-400 mg/daily) in the presence of EF% < 30% or contraindication to sotalol, (Group A), or sotalol (SOT) (80-140 mg/daily) in the presence of EF > or = 31%. (Group C). Conversely, in case of recurrences, patients were assigned to receive AMIO (200-300 mg/daily) plus metoprolol (MET) (20-100 mg/daily), (Group B) or, in case of intolerance to beta-blockers, to AMIO plus mexiletine (MEX) (200 mg/daily) (Group D). The four groups were similar for the type of VA, with recurrent ventricular tachycardia (RVT) being the most frequent one. The most frequent underlying cardiac disease of VA in this study was post-AMI CAD, with a rate of over 60% in all four groups. Single- and two-vessel lesions were found at CAR in various patients in all four groups, in 5/13 (38%) in Group A, in 8/14 (57%) in Group B, in 5/7 (71%) in Group C, and in 3/5 (60%) in Group D. Cardiac surgery was performed in a similar and limited number of patients in all four groups, in 4/13 (30%) in Group A, in 4/14 (35%) in Group B, in 2/7 (28%) in Group C, and in 2/5 (40%) in Group D. In 8/39 (20.5%) of the patients who underwent CABG, there was no operative or late mortality; 4/39 (10.2%) received CABG and LVA, and two died. For the amiodarone plus metoprolol and sotalol patients only, PES showed a lower residual inducibility, in comparison to the amiodarone and amiodarone + mexiletine groups. In the entire group, 7 out of 26 (27%) were still inducibile at PES while in 19/26 (64%) of the patients, an apparently effective treatment could be found, documenting the relative usefulness of PES. Recurrence rate was the highest in the amiodarone + mexiletine group and in patients with previous CA. Our data show the potential utility and limitations of ADT, even using the most effective antiarrhythmic drugs and association of drugs, mainly because of the high recurrence rate of VT observed in the present study, even in non-inducible patients [14/39 (36%)]. In conclusion, in a prospective and staged-care approach protocol of management of VT/VF patients, only a few patients with VT/VF benefited from cardiac surgery. PES could still play a role in the evaluation of the most effective ADT. Amiodarone + metoprolol seems to be the most effective ADT in these patients. Nevertheless, a high recurrence rate was observed in this patient population, even with an aggressive protocol, in the short follow-up period of 12 +/- 8 months, confirming recent data on the superiority of ICD to ADT, in patients with frequent recurrences or hemodynamically poorly-tolerated VT. In these patients, ICD therapy should definitively be preferred to ADT.

Adult↗
PubMed1999

[Clinical characteristics, familial distribution and preliminary genetic data in 9 different families with "Brugada's syndrome"].

Clinical electrocardiographic evaluation and complete non-invasive assessment including nuclear magnetic resonance (NMR) are reported for 7 subjects with cardiac arrest (CA), 6 due to ventricular fibrillation (VF) and 1 to ventricular tachycardia (VT). Two more subjects, one with and one without a family history of non-resuscitated sudden death (NRSD), were included. All 9 subjects showed the typical pattern of the Brugada's syndrome (BS), characterized by incomplete right bundle branch block, ST T elevation in V1 V3. We globally evaluated 64 subjects belonging to the 9 families examined, 5 of whom were identified in Bologna, 3 in Florence and one in Parma. BS is characterized in the experience described in the present paper by a family distribution of the ECG pattern in different members. Furthermore, a family distribution of NRSD, even at a young age, was observed. Electrocardiographic features were consistent with variable degrees and aspects of the intraventricular conduction delay (ICD) and of the ST T elevation pattern. NMR has been performed so far in 23 out of 64 members examined by echo, and was normal in 17/23, with only 6 showing pathological aspects such as mild dilatation of the right ventricle, reduced thickness of the right free wall, isolated dilatation of the right ventricular infundibulum and other minor pathological aspects. Preliminary genetic screening (GS), performed on 20 members of three families, was negative for the typical genetic patterns of right ventricular dysplasia (ARVD). In six families, GS is still ongoing. Genetic screening of sodium channel pathology is in progress in the same families. In conclusion, BS has been documented in the present paper as a hereditary syndrome, both for clinical and ECG aspects, associated with CA due to VF, which required an AICD implantation, at least in symptomatic subjects. There may exist a CONGENITAL form of BS due to pathology of sodium channels, without a demonstrable structural heart disease and an ACQUIRED form of BS secondary to an initial ARVD. From the clinical point of view, a complete evaluation, including serial ECG, pharmacological testing and programmed electrical stimulation of other subjects in the families, may be important in preventing sudden death, mainly in symptomatic subjects who always require an implantable cardioverter defibrillator.

Bundle-Branch Block↗
PubMed1994

Role of bypass, endarterectomy, extra-anatomic bypass and endovascular surgery in unilateral iliac occlusive disease: a review of 1257 cases.

Some 1257 patients who had undergone revascularization procedures for unilateral iliac occlusions were reviewed retrospectively. A total of 824 patients were operated upon using conventional operations, 165 patients had femorofemoral bypass and 268 were treated using endovascular surgery techniques. Revascularization was performed through an extraperitoneal approach by means of iliac thromboendarterectomy (560) or iliac femoral bypass (264) if there was a total occlusion of either the common or external iliac artery (group 1). A femorofemoral crossover bypass was inserted when the operative risk was considered to be high (group 2). Endovascular procedures (percutaneous transluminal angioplasty 234, laser percutaneous transluminal angioplasty 11, stenting 22, atherectomy one) were used in recent years to treat stenoses or occlusions of 3 cm or less (group 3). The indications for operation were severe claudication in 79.7% in group 1 and 92.6% in group 3, whereas in group 2 66.7% of patients presented with symptoms of more advanced ischaemia. The immediate patency rate was 97.0% after extraperitoneal reconstructive surgery, 96.9% in the femorofemoral group and 92.1% in patients having an endovascular procedure. The operative mortality rate was 0.7, 4.2, and 0.3% for groups 1-3, respectively. The 5-year patency rate, analysed by the life-table method, was 77.9% in group 1, 75.3% in group 2 and 73.7% in group 3 (P = n.s., log rank test). The different revascularization techniques were chosen on the basis of the type of disease present and the patient's general condition. All procedures appeared to be effective when correctly selected.

Adult↗
PubMed1992

Clinical significance of coronary artery disease in hypertrophic cardiomyopathy.

The role of coronary artery disease (CAD) in hypertrophic cardiomyopathy (HC) has not been thoroughly clarified. To assess the clinical and prognostic significance of these 2 coexistent diseases, 96 patients with HC (62 men, mean age 45 years) who underwent coronary arteriography and 2-dimensional echocardiography were studied. Significant stenosis (greater than 70%) of 1 or more coronary arteries was detected in 11 patients, all aged greater than 45 years. This group, compared with the other group without significant CAD (n = 85), was characterized by an older age (59 +/- 7 vs 42 +/- 15 years; p less than 0.05), a greater prevalence of previous myocardial infarction (24 vs 0%; p less than 0.001), complex ventricular arrhythmias (100 vs 50%; p less than 0.05), non-obstructive forms (82 vs 46%; p less than 0.05), dilated (45 vs 7%; p less than 0.02) and hypocontractile left ventricle (36 vs 6%; p less than 0.01) and higher mortality (36 vs 8%; p less than 0.05) during a mean follow-up of 3.6 years. It is concluded that CAD associated with HC is a complex clinical syndrome, difficult to diagnose clinically, that can reliably be recognized by coronary angiography. CAD seems to play an important role in modifying the pathophysiology, the natural history and the prognosis of HC.

Adolescent↗
PubMed1990

[The clinical significance of signal-averaged electrocardiography in hypertrophic cardiomyopathy].

We examined 44 patients (pts) with hypertrophic cardiomyopathy to evaluate the prognostic value of signal-averaged electrocardiography and its possible correlations with clinical and instrumental data. All pts (31 male, 13 female, mean age 47 +/- 15) underwent clinical examination, standard electrocardiography, M-mode and two-dimensional echocardiography, 24-72 hour dynamic electrocardiography and signal-averaged electrocardiography. The mean follow-up was 14 +/- 4 months. Signal-averaged electrocardiography was performed using a 40-250 Hz bidirectional filter. An abnormal signal-averaged electrocardiography with late potentials (filtered QRS duration greater than or equal to 120 msec and root mean square voltage in terminal 40 msec less than or equal to 20 microvolts) was detected in 5 pts (group A, 11%) while 39 pts (group B, 89%) had a normal signal-averaged electrocardiography. Ventricular tachycardia runs at dynamic ECG were present in 2 pts in group A (40%), and in 8 in group B (21%, p = NS). No statistical differences were found between the two groups for any clinical or instrumental data. During our study, one group A patient died suddenly. In detecting subjects with ventricular tachycardia runs, signal-averaged electrocardiography sensitivity was 20%, and specificity was 91%. High specificity suggests that signal-averaged electrocardiography might be used to detect pts at a lower risk for ventricular tachycardia. Further investigations are required to evaluate the predictive value of signal-averaged electrocardiography for sudden death in hypertrophic cardiomyopathy.

Adolescent↗
PubMed1988

[Efficacy of verapamil in the prevention of ventricular fibrillation in the acute phase of myocardial infarction].

The effectiveness of verapamil in preventing ventricular fibrillation caused by coronary occlusion or reperfusion has been well demonstrated in animal studies, but these experimental data have not yet been confirmed in man. In this study we evaluated the prevalence of ventricular arrhythmias (fibrillation, sustained tachycardia and frequent extrasystoles) in patients hospitalized for myocardial infarction and treated with or without verapamil. The records of patients admitted to our Coronary Intensive Care unit during a 5-year period were analyzed retrospectively. Strict selection criteria enabled us to divide our patients into two homogeneous groups. The control group (group A) consisted of 106 patients who received only continuous infusions of heparin. The treated group (group B) comprised 89 patients who received exclusively verapamil by intravenous injections followed by continuous infusions. The prevalence of ventricular arrhythmia of all types was significantly lower in group B (22 p. 100) than in group A patients (71 p. 100; p less than 0.001). Episodes of ventricular fibrillation, in particular, were considerably less frequent in group B patients (1 p. 100) than in group A patients (13 p. 100; p less than 0.001). It would appear from these results that verapamil is highly effective in preventing death due to cardiac arrhythmia in the acute phase of myocardial infarction.

Cardiac Complexes, Premature↗
PubMed1987

Body surface maps in left bundle branch block uncomplicated or complicated by myocardial infarction, left ventricular hypertrophy or myocardial ischemia.

We provided a topographic and quantitative description of body surface maps (BSM) during the entire QRST interval in seven uncomplicated LBBBs and 31 LBBBs complicated by: myocardial infarction (MI, seven cases), left ventricular hypertrophy (LVH, eight cases), myocardial ischemia (IS, seven cases), MI + LVH (six cases) and LVH + IS (three cases). In all patients we observed abnormal map configurations attributable to the LBBB. We were unable to identify consistent effects of the complicating heart condition(s) on the general pattern of chest potentials. Conversely, the surface voltages were generally decreased by MI and IS and increased by LVH. By considering the 38 patients as a preliminary learning set we applied a stepwise discriminant analysis to 77 voltage-related variables derived from BSM to produce a model for discriminating between LBBBs with and without MI. We properly allocated more than 90% of the patients. We also attempted to classify the patients into four groups: pure LBBB, LBBB + MI, LBBB + LVH and LBBB + IS, with a percentage of correct classification of about 80%. The two classifying procedures were applied to ten new LBBB patients with results similar to those obtained in the 38 of the study group.

Adult↗
PubMed1987

[Identification using thoracic electromapping of patients with sustained postinfarct ventricular tachycardia. Preliminary results of a new method of analysis of ST-T isoarea maps].

Recent studies have demonstrated that body surface maps (BSM) can be employed as non-invasive diagnostic tool for recognizing cardiac states at risk for repetitive ventricular arrhythmias in patients (pts) with old infarction. Our study reports preliminary results of a new method of statistical analysis of ST-T isoarea maps for identifying patients with post-infarction sustained ventricular tachycardia. 38 pts with previous myocardial infarction have been studied, 25 without and 13 with sustained ventricular tachycardia (VT). The two groups of pts did not differ significantly for age, site of infarction and ejection fraction. BSM have been recorded by means of an automated 35-channels instrument from 140 thoracic leads. For each lead ST-T deflection area has been calculated in microV.sec and taken as input variables for stepwise discriminant analysis which allowed identification of the integral values significantly discriminant (for F less than 0.15) between the two groups. Canonical analysis has been applied to identified values to obtain, by canonical coefficients, linear combination of the values for the highest correlation with the two groups of pts. To test the power of the method, the two groups of pts have been divided randomly in a learning set (17 pts without and 9 pts with VT) and a test set (8 pts without and 4 pts with VT).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1985

Monophasic action potential studies in human subjects with prolonged ventricular repolarization and long QT syndromes.

In 58 human subjects monophasic action potentials (MAPs) were recorded with suction electrodes in several areas of the right ventricle (RV). Individual differences between the longest and the shortest RV MAP durations indicate that: normally (40 subjects) ventricular repolarization is almost synchronous; QT prolongation due either to bradycardia or to amiodarone treatment (eight cases) may be the result of a uniform lengthening of ventricular repolarization, when ventricular arrhythmias are not present; in long QT syndromes (LQTSs) of differing etiology (10 cases), in which severe ventricular arrhythmias are present, marked individual differences in RV MAP duration are present and correspond with pathological asynchrony of ventricular repolarization. Also observed in the LQTSs are morphological alterations (humps) in the terminal phase of the longest MAPs. Humps, interpreted as pathological delayed repolarization phenomena, may lead to focal re-excitation which seems to play a key role in the genesis of the arrhythmias complicating LQTSs.

Adolescent↗
PubMed1983

Recording of monophasic action potentials of the right ventricle in long QT syndromes complicated by severe ventricular arrhythmias.

Monophasic action potentials (MAPs) were recorded with intracardiac suction electrodes in several areas of the right ventricle in 10 patients with long QT syndromes (with "torsades de pointe') of different etiology. In all cases two characteristic electrophysiological features were observed: (1) a marked difference in MAP duration in the different areas of the right ventricle (asynchronous repolarization); (2) an alteration in the shape of the longest MAPs consisting in humps which occurred on the repolarization phase of MAP. Humps may be interpreted as delayed repolarization phenomena probably due to a decrease in potassium conductance of some ventricular cells. These may lead to focal re-excitation as a result of partial membrane depolarization. Focal re-excitation seems to play a key role in the genesis of severe arrhythmias occurring in the above mentioned syndromes.

Action Potentials↗
PubMed1983

[Validity and limits of invasive pharmacological tests in the treatment of malignant ventricular hyperkinetic arrhythmias].

Programmed stimulation can now be safely performed for the evaluation of therapy for recurrent ventricular tachyarrhythmia. The initiation of ventricular tachycardia appears closely related to its actual spontaneous clinical occurrence. Serial electrophysiologic studies can be performed and are effective in prospectively evaluating the response to antiarrhythmic drugs. The efficacy of therapy based on the results of programmed stimulation appears to be good. On the other hand, Amiodarone can be effective in the chronic treatment as well as in patients with ineffective acute drug test.

Adult↗