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Biomedical subjects

C Napolitano

Publications and source records attributed to C Napolitano.

At least 73 records · Page 4Linked to original sources
PubMed1994

Management of stage III and IV endometriosis: a 10-year experience.

A retrospective analysis is reported of the management of 117 cases of infertility associated with Stage III and IV endometriosis. Combined medico-microsurgical treatment was selected in 75.3% of Stage III cases and in 83.3% of those on Stage IV. Medication consisted of medroxyprogesterone acetate in 26 patients and danazol in the remaining 64. Microsurgery alone was utilized in 24.7% of Stage III patients and in 16.6% of those on Stage IV. Both surgery alone and the combined therapy had a profound positive effect on subjective symptoms: dysmenorrhea, dyspareunia and pelvic pain. Following combined therapy, pregnancy was achieved in 34.4% of all women. Respective figures are 30.7% for medroxyprogesterone acetate (29.4% Stage III and 33.3% Stage IV) and 35.9% for danazol (37.7% Stage III and 27.2% Stage IV). In the group of patients treated by surgery alone, pregnancy occurred in 25.9%. Of the pregnancies in women with Stage III endometriosis, 25 were carried to term and 6 ended with a spontaneous abortion; figures for Stage IV women are 5 and 2, respectively. Second-look laparoscopy was performed in 49 of the 79 patients who failed to conceive, at 12-36 months after treatment; persistent genital pathology, to which infertility could be attributed, was found in 77.5% of them.

Combined Modality Therapy↗
PubMed1994

Dispersion of the QT interval. A marker of therapeutic efficacy in the idiopathic long QT syndrome.

BACKGROUND: QT interval dispersion, measured as interlead variability of QT, is a marker of dispersion of ventricular repolarization and, hence, of cardiac electrical instability. We tested the hypothesis that dispersion of ventricular repolarization may be differently affected by interventions destined to provide complete or incomplete protection against malignant arrhythmias in patients with long QT syndrome (LQTS). Twenty-eight patients affected by the Romano Ward form of LQTS entered the study and were divided into three groups: LQTS patients before institution of therapy, patients who did respond to beta-blocker therapy, and patients who continued to have syncope and cardiac arrest despite beta-blockade and who underwent left cardiac sympathetic denervation. A group of 15 healthy volunteers served as control subjects. METHODS AND RESULTS: Dispersion of QT and QTc were calculated using two indexes: the difference between the longest and the shortest value measured in each of the 12 ECG leads (QTmax-QTmin, QTcmax-QTcmin) and the relative dispersion of QT and QTc (standard deviation of QT/QT average x100, standard deviation of QTc/QTc average x100). Both indexes of dispersion of repolarization were higher in the LQTS patients than in control subjects; also, patients not responding to beta-blockers had a significantly higher dispersion of repolarization than responders. A cutoff value of 100 milliseconds for QTmax-QTmin had an 80% sensitivity and 82% specificity in discriminating between responders and nonresponders. A cutoff value of 6 for QT relative dispersion yielded similar results. The LQTS patients who did not respond to beta-blockade underwent left cardiac sympathetic denervation and thereafter remained asymptomatic (mean follow-up, 5 +/- 4 years). In this group, dispersion of repolarization was significantly reduced by the surgical denervation to values similar to that of the responders to beta-blockade. CONCLUSIONS: These data indicate that QT dispersion is a useful clinical tool to predict efficacy of antiadrenergic therapy in LQTS patients.

Adolescent↗
PubMed1994

Torsade de pointes. Mechanisms and management.

Torsade de pointes is a polymorphic ventricular tachycardia showing a peculiar electrocardiographic pattern characterised by a continuous twisting in QRS axis around an imaginary baseline. An abnormally prolonged QT interval is actually associated with torsade de pointes and it is constantly observed in the sinus beats preceding the onset of the arrhythmic event. Prolongation of ventricular repolarisation associated with the development of torsade de pointes can be observed in many clinical conditions, commonly referred to as prolonged QT syndromes, which can be divided into two major groups: (a) idiopathic long QT syndrome (LQTS), which include the Jervell-Lange-Nielsen and the Romano-Ward syndromes; and (b) acquired prolonged QT syndromes, which are largely iatrogenic and may follow treatment with antiarrhythmic drugs, tricyclic antidepressants, phenothiazines or macrolide antibiotics, and may be associated with metabolic disturbances (hypokalaemia, hypocalcaemia and hypomagnesaemia). Clinical studies have provided criteria for the definition and guidelines for the management of torsade de pointes, while the electrophysiological mechanisms responsible for its onset are still unclear. Two pathogenetic hypotheses have been proposed to account for the electrophysiological mechanisms underlying the condition: (a) re-entry due to a dispersion of refractory periods; and (b) triggered activity initiated by either early or delayed after-depolarisations. Both mechanisms are supported by clinical and experimental observations but a conclusive answer is not yet available.

Cardiovascular Agents↗
PubMed1994

[Late posttraumatic diaphragmatic hernia. A clinical case report].

On the basis of the observation of one case of delayed presentation of traumatic diaphragmatic rupture of the left side with a late diaphragmatic hernia, the authors examine the evolution of the occurrence of this pathology during the last 20 years. The clinical signs and the modality of presentation of the lesions of delayed diagnosis appear absolutely non specific. Incorrect interpretation of the X-ray or only intermittent hernial symptoms are frequent reasons for incorrect diagnosis. Also the initially non recognition of the possible manifestation of the diaphragmatic hernia following blunt or penetrating injuries is usually because the practitioner has not sought it. The diaphragmatic domes must be systematically explored during the laparotomy or thoracotomy performed for thoraco-abdominal trauma. Surgical treatment of long-standing post-traumatic diaphragmatic hernia is the same as that applicable in the recent hernias.

Accidents, Traffic↗
PubMed1993

Cardiac receptor activation and arrhythmogenesis.

New evidence has been accumulated allowing a better understanding of the physiology and pathophysiology of receptors in the heart. Three major receptor systems influence electrophysiological characteristics of myocardial cells and are critical in the development and prevention of cardiac arrhythmias: the adrenergic, the muscarinic and the adenosine systems. Although it has long been recognized that beta adrenergic stimulation is arrhythmogenic, only recently have the mechanisms of this arrhythmogenic effect been clarified. In addition, the contribution to arrhythmogenesis of alpha receptor stimulation, which has been overlooked for many years, has been recognized as an important accompaniment to the beta component, especially during hypoxia-ischaemia. On the other hand, it has been demonstrated that although direct electrophysiological effects of acetylcholine on the ventricle remain controversial, the antagonism of sympathetic activation by cholinergic stimulation may be important in preventing arrhythmias induced by a high sympathetic tone in the presence of myocardial ischaemia. More recently, the importance of the adenosine system has been better appreciated. Experimental studies have shown that adenosine receptor activation inhibits the adenylyl cyclase system by activating the Gi regulatory proteins. Activation of this pathway inhibits the development of adrenergic-dependent triggered activity in isolated cells and these have also been confirmed in man. It is likely that this effect is specific against triggered rhythms induced by adrenergic activation. Even though further research is needed to clarify fully the interaction of these three systems at the subcellular level, the pharmacological modulation of these cardiac receptors appears as a rational approach for refining the treatment of arrhythmias.

Animals↗
PubMed1993

The evolution of the management of "CIN" lesions.

During the years 1961-1986 a total of 378 CIN lesions were diagnosed among 4875 women screened for cervical pathology; 285 of them were followed-up for a minimum of 5 years. All 169 cases diagnosed as CIN-3 and 18 classified as CIN-2 were treated surgically, whereas 89 patients diagnosed as CIN-1 and 65 classified as CIN-2 were treated conservatively. Finally, 37 cases (23 diagnosed as CIN-1 and 14 diagnosed as CIN-2) did not receive any treatment. Of the 187 women treated surgically, 6 (3.8%) showed, within the five year follow-up period, progression or recurrence of the disease, which necessitated either additional surgery or radiation; 5 of these cases had been classified as severe dysplasia (CIN-3). Recurrence or progression necessitating major surgery, occurred in 8 (5.1%) of the 154 patients treated conservatively; 5 of these cases were classified as moderate dysplasia (CIN-2). The data indicate that present diagnostic procedures allow a better selection of patients to be submitted to surgery, increasing the proportion of those treated conservatively, without jeopardizing their prognosis.

Adult↗
PubMed1991

Electrophysiologic mechanisms involved in the development of torsades de pointes.

Torsades de pointes (TDP) is a polymorphic ventricular tachycardia with a peculiar electrocardiographic pattern of continuously changing morphology of the QRS complex twisting around an imaginary baseline. The clinical setting under which TDP develops covers many clinico-pathologic conditions, including the long QT syndrome (LQTS). In the present review, we analyze the evolution of the hypotheses for the mechanisms underlying TDP and we discuss some of the experimental models used and their related clinico-pathologic counterparts. Together with the hypothesis that TDP represents a form of reentrant arrhythmia, recent evidence has suggested the possibility that triggered activity may indeed be responsible for TDP. Data collected in vitro are presented that demonstrate a role for catecholamines in the development of afterpotentials in ventricular tissue. Whether adrenergic-mediated afterdepolarizations are the mechanism responsible for TDP in the clinical setting of LQTS has not yet been proven and remains an important area of investigation.

Disease Models, Animal↗
PubMed1990

Early afterdepolarizations induced in vivo by reperfusion of ischemic myocardium. A possible mechanism for reperfusion arrhythmias.

Recent studies in vitro have shown that afterdepolarizations may develop during reperfusion after hypoxia, thus suggesting that these afterdepolarizations may contribute to the genesis of reperfusion arrhythmias. We recorded monophasic action potentials (MAPs) during myocardial ischemia and reperfusion to investigate whether afterdepolarizations develop in vivo when reperfusion arrhythmias occur. In 15 anesthetized cats, 24 trials of 10 minutes of occlusion of the left anterior descending coronary artery were followed by reperfusion. In 13 of 24 (54%) trials, afterdepolarizations developed at the moment of reperfusion, with a mean amplitude of 2.4 +/- 1.1 mV (13 +/- 8% of MAP amplitude). When cycle length was either increased by vagal stimulation or decreased by atrial pacing, early afterdepolarization (EAD) amplitude was modified, according to what has been described for EAD in vitro, with a positive linear correlation between cycle length and EAD amplitude (r = 0.91, p less than 0.0001). The occurrence of EAD was not related to rapid changes in left ventricular pressure. In the eight of 13 (62%) cases in which EAD development was associated with reperfusion arrhythmias, the coupling interval of the EAD and of premature ventricular contractions showed a significant correlation (r = 0.86, p less than 0.0001). However, in five of 13 (38%) cases, occurrence of reperfusion arrhythmias was not accompanied by the presence of EAD on the MAP recording. In two animals, a 2:1 block of EAD conduction was observed, and this was reflected on the intracavitary electrocardiogram as T wave alternans. Thus, EADs occur frequently after reperfusion in vivo, with a time course that parallels the onset of reperfusion arrhythmias. This finding further supports the role of triggered activity in the genesis of reperfusion arrhythmias in vivo.

Action Potentials↗
PubMed1989

[Cefotetan in preoperative prophylaxis in gynecologic surgery].

The Authors report on the effectiveness of a 2nd generation "cephalosporin" (Cefotetan) used in preventive antibiotic treatment connected with gynaecological surgery. Two hundred hospital patients were involved in the experiment and were divided into 4 groups: 1) the first and second groups were given a "short-term" preventive antibiotic treatment (a single dose before the operation); 2) the third and fourth groups were given antibiotics continuously in the post-operative period. In those patients in groups I and III (who had operations for abdominal laparotomies) the incidence of fewerishness was 12% in those patients treated with the "short-term" therapy, and 10% in those receiving post-operative treatment. Sepsis on the suture developed in none of these cases. Urinary infection occurred in 6% of these patients in group I as compared with 2% in group III. During post-operative treatment of patients in group II and IV (who had had minor gynaecological operation) the incidence of inflammation with slight temperature was very much lower only 4% of the cases treated with "short-term" preventive antibiotics and only 2% in those patients receiving continuous preventive treatment. In no case was these sepsis of the suture. Urinary infection occurred in 4% of patients on "short-term" therapy (group II) but in none of the patients in group IV. Side effects were in all cases only slight and of brief duration, especially in group I and II who received the single pre-operative dose of the antibiotic.

Adolescent↗
PubMed1988

Endocrine and morphological study of a case of ovarian sex-cord tumor with annular tubules in a woman with Peutz-Jeghers syndrome.

A bilateral ovarian sex-cord tumor with annular tubules (SCTAT) was incidentally discovered in an amenorrheic patient with Peutz-Jeghers syndrome during conservative surgery in which a small non-capsulated mass was removed from each ovary. Ovulation was then induced over two consecutive cycles with urinary gonadotropins; the couple did not conceive because of a male infertility factor. Hysterectomy and bilateral oophorectomy were performed to prevent recurrence and avoid the possibility of a cervical malignant adenoma. Immunohistochemistry of the SCTAT showed positivity for estradiol and testosterone similar to that of Sertoli and granulosa cell tumors; progesterone was not detected in any cellular component of the neoplasia. Electron microscopy showed that the neoplasm consisted of numerous solid cords of cells surrounded by fibrillary layers of basal lamina, as well as central hyaline bodies. Two types of cells, clear and dark, were noted; clear cells were predominant and intermixed with scattered dark cells. No crystalloids or Charchot-Bottcher filaments were detectable in the tumors.

Adult↗