Safety and immunogenicity of co-administered MF59-adjuvanted 2009 pandemic and plain 2009-10 seasonal influenza vaccines in rheumatoid arthritis patients on biologicals

Rheumatoid arthritis (RA) patients under immunosuppressive therapy are particularly susceptible to infections, mainly of the respiratory tract, thus vaccination may represent a strategy to reduce their incidence in this vulnerable population. In the 2009-10 influenza season, the safety and immunogenicity of co-administered non-adjuvanted seasonal and MF59-adjuvanted pandemic influenza vaccines were evaluated in this study in 30 RA patients under therapy with anti-tumour necrosis factor (TNF)-α agents or Abatacept and in 13 healthy controls (HC). Patients and HC underwent clinical and laboratory evaluation before (T0), 1 (T1) and 6 months (T2) after vaccinations. No severe adverse reactions, but a significant increase in total mild side effects in patients versus HC were observed. Both influenza vaccines fulfilled the three criteria of the Committee for Proprietary Medicinal Products (CPMP). Seroconversion rate for any viral strain in patients and HC was, respectively, 68 versus 45 for H1-A/Brisbane/59/07, 72 versus 81 for H3-A/Brisbane/10/07, 68 versus 54 for B/Brisbane/60/08 and 81 versus 54 for A/California/7/2009. A slight increase in activated interferon (IFN)-γ-, TNF-α- or interleukin (IL)-17A-secreting T cells at T1 compared to T0, followed by a reduction at T2 in both patients and HC, was registered. In conclusion, simultaneous administration of adjuvanted pandemic and non-adjuvanted seasonal influenza vaccines is safe and highly immunogenic. The largely overlapping results between patients and HC, in terms of antibody response and cytokine-producing T cells, may represent further evidence for vaccine safety and immunogenicity in RA patients on biologicals.

Investigation of an imported case of Middle East Respiratory Syndrome Coronavirus (MERS-CoV) infection in Florence, Italy, May to June 2013

On 31 May 2013, the first case of Middle East Respiratory Syndrome Coronavirus (MERS-CoV) infection in Italy was laboratory confirmed in a previously healthy adult man, who developed pneumonia with moderate respiratory distress after returning from a holiday in Jordan. Two secondary cases were identified through contact tracing, among family members and colleagues who had not previously travelled abroad. Both secondary cases developed mild illness. All three patients recovered fully.

Multicentre observational study of the natural history of left-sided acute diverticulitis

BACKGROUND

The natural history of acute diverticulitis (AD) is still unclear. This study investigated the recurrence rate, and the risks of emergency surgery, associated stoma and death following initial medical or surgical treatment of AD.

METHODS

The Italian Study Group on Complicated Diverticulosis conducted a 4-year multicentre retrospective and prospective database analysis of patients admitted to hospital for medical or surgical treatment of AD and then followed for a minimum of 9 years. The persistence of symptoms, recurrent episodes of AD, new hospital admissions, medical or surgical treatment, and their outcome were recorded during follow-up.

RESULTS

Of 1046 patients enrolled at 17 centres, 743 were eligible for the study (407 recruited retrospectively and 336 prospectively); 242 patients (32·6 per cent) underwent emergency surgery at accrual. After a mean follow-up of 10·7 years, rates of recurrence (17·2 versus 5·8 per cent; P < 0·001) and emergency surgery (6·9 versus 1·3 per cent; P = 0·021) were higher for medically treated patients than for those treated surgically. Among patients who had initial medical treatment, age less than 40 years and a history of at least three episodes of AD were associated with an increased risk of AD recurrence. There was no association between any of the investigated parameters and subsequent emergency surgery. The risk of stoma formation was below 1 per cent and disease-related mortality was zero in this group. The disease-related mortality rate was 0·6 per cent among patients who had surgical treatment.

CONCLUSION

Long-term risks of recurrent AD or emergency surgery were limited and colectomy did not fully protect against recurrence.

Molecular surveillance of pandemic influenza A(H1N1) viruses circulating in Italy from May 2009 to February 2010: association between haemagglutinin mutations and clinical outcome

Haemagglutinin sequences of pandemic influenza A(H1N1) viruses circulating in Italy were examined, focusing on amino acid changes at position 222 because of its suggested pathogenic relevance. Among 169 patients, the D222G substitution was detected in three of 52 (5.8%) severe cases and in one of 117 (0.9%) mild cases, whereas the D222E mutation was more frequent and evenly distributed in mild (31.6%) and severe cases (38.4%). A cluster of D222E viruses among school children confirms reported human-to-human transmission of viruses mutated at amino acid position 222.

Influenza vaccine administration in rheumatoid arthritis patients under treatment with TNFalpha blockers: safety and immunogenicity

Twenty-eight patients with low-moderate, stable rheumatoid arthritis (RA), under treatment with tumor necrosis factor (TNF) alpha blockers, were immunized at least once with non-adjuvanted trivalent influenza vaccine during three consecutive influenza seasons. Antibodies toward A influenza antigens significantly increased and reached protective levels, still detectable 6 months after vaccination, both in RA patients and healthy controls. Response to B antigen instead was only observed from the second year for healthy controls and in the third year for patients. No significant difference in disease activity and anti-nuclear antibodies was observed as a consequence of vaccine administration, whereas T regulatory cells showed a significant increase 30 days after immunization in RA patients. This study confirms safety of influenza vaccine administration in RA patients treated with TNFalpha blockers. The cohort follow-up revealed the overcoming of poor B vaccine antigen immunogenicity via repeated vaccinations. Finally, protective antibody response was still observed 6 months after vaccination.

[Vaginal swab in pediatric age]

Vaginal secretion sampling in young patients. The aim of the study was to evaluate whether different instrumental tools (the classical cotton swab, the urethral cotton swab, the balloon shape cotton swab and cyto-brush) yield different sampling success in young patients presenting with suspected vulvovaginitis. The study was conducted in a randomised prospective way on 100 children with symptoms of vulvovaginal infection (age range: 4 months -8 years ) seen at the Clinic of Paediatric Gynaecology of the Department of Obstetric and Gynaecology, "V.Buzzi" Children's Hospital, Milano (Italy). Children's compliance and the number of samples which had to be discontinued, because of children's intolerance have allowed the evaluation of each tools. Each of these tools was tested on 25 young patients. The vaginal secretion sampling was not possible on 8 patients out of 25 with cyto-brush (32%), on 7 out of 25 with the balloon shape cotton swab (28%), on 4 out of 25 with the classical cotton swab (16%) and only 1 out of 25 with the urethral cotton swab (4%). In conclusion all the instruments tested allow sampling of vaginal secretion in young children, but the reaction and compliance of the patients has been best with the otologic cotton swab.

Smoking and weight control behaviors

OBJECTIVE

To examine the association between weight control and tobacco use in young women.

METHODS

Smoking status and weight and eating related issues, endorsement of the belief "smoking helps to control weight" dieting status (DEBQ-R), current and ideal weight and current height were assessed in 144 students.

RESULTS

Smoker (S) restrained eaters (RE) scored higher on dietary restraint than nonsmoker (NS) RE. In the smoking questionnaire, S-RE selected a significantly higher number of items concerning hunger, eating and weight than S unrestrained eaters (URE). S-RE had a greater level of endorsement of the belief: "smoking helps to control weight" than NS-URE. The subjects who marked those items had significantly higher scores in the DEBQ-R and were more likely to be RE than those who marked none of them.

CONCLUSION

Our findings suggest that among young women who smoke and diet there might be a risk group that smokes as a weight control strategy.

[Comprehensive treatment of obesity and its prevention]

Obesity is associated to chronic metabolic entities affecting the quality of life and life expectancy. An early treatment, if efficient, can overcome most of the problems. The normalisation of body composition, of energy reserves and their distribution, as well as the minimisation of weight dependent metabolic upsets and the establishment of therapeutic priorities, according to the repercussions of obesity, are important factors for the treatment of this disease. Prevention is important and its basis is teaching and the setting in healthy life style with modification of the food habits and the incorporation of physical work into everyday activities. Diet therapy, physical activity, pharmacotherapy, surgery education and psychology are the forms proposed for the treatment and prevention of obesity.

Characterization of the non-linear rate-dependency of QT interval in humans

AIMS

Repolarization has rate-dependent and rate-independent components. A function considering such components separately was validated in canine Purkinje fibres and applied to the QT/RR relation in humans.

METHODS AND RESULTS

Action potential duration (APD) was measured in Purkinje fibres during steady-state pacing at different cycle lengths (CL) and after prolonged quiescence (APD(0)). The APD/CL relationship was expressed by this function: APD=APD(max)(*)CL(S)/(CL(50)(S)+CL(S)), where APD(max) (APD extrapolated at infinite CL) is a rate-independent measure of repolarization, CL(50) (CL at which 50% of APD(max) is achieved) and S evaluates the rate dependency of APD. The same function was used to fit the QT/RR relation in 46 normal subjects (20 males, 26 females) and in 7 amiodarone-treated subjects undergoing a bicycle stress test. RR and QT (V(5)) were measured at the end of each load step; QT(c) (Bazett's formula) was obtained at rest. The APD/CL and QT/RR relations were equally well expressed by the function with high correlation coefficients (R>or=0.90). In Purkinje fibres, APD(max) was 461+/-37 ms, CL(50) was 394+/-54 ms and S was 0.98+/-0.11. APD(max) and APD(0) correlated (R=0.96) and were similar. The corresponding values in humans were: QT(max) 432+/-63 ms, RR(50) 345+/-60 ms and S 2.6+/-0.8. While QT(c) and QT(max) were longer in females, RR(50) and S were similar between genders. Amiodarone increased QT(c), QT(max) and RR(50) and decreased S. In QT(max) and QT(c) distributions generated by pooling data from treated and untreated subjects, 86% of treated subjects were correctly identified by QT(max) and 28% by QT(c).

CONCLUSIONS

Canine and human repolarization showed a saturating dependency on cycle length, described by the proposed function. Gender and amiodarone independently affected QT(max), RR(50) and S: therefore they might reflect specific ionic mechanisms. Finally, QT(max) identified drug-induced repolarization abnormalities in individual subjects better than QT(c).

Changes of autonomic cardiac profile after a 3-week integrated body weight reduction program in severely obese patients

The autonomic control of the heart is abnormal in obese subjects due to a prevalence of sympathetic over parasympathetic limb of the autonomic balance. We evaluated the effects of a short-term (3 weeks) integrated body weight reduction program (consisting of energy restricted diet and high-intensity exercise training) on heart rate variability (HRV) in severely obese, normotensive patients. The HRV was evaluated both in the time and frequency domain over a 18-hour Holter recording period obtained before and at the end of the third week. Three-week body weight reduction program reduced BMI (from 41.4 +/- 4.6 to 39.5 +/- 4.3 kg/m2, -4.6%, p<0.0001) and heart rate (from 77.8 +/- 8.6 to 73.6 +/- 8.7 b/min, p=0.0003). Significant changes in the autonomic profile were observed both in the time and frequency domain (SD of RR interval, SDRR: +16.1%; mean squared successive difference: (MSSD) +16.7%; percentage of RR intervals differing more than 50 msec from the preceding one, pNN50: +31.8%; low frequency oscillation, LF: +17.1%; high frequency oscillation, HF: +/- 18.2%). In conclusion, this study demonstrates that a short-term, integrated body weight reduction program is able to favorably modify the autonomic profile in a population of normotensive, severely obese subjects. The reduction of heart rate and the increase in parasympathetic activity may consistently contribute to a reduction of the risk of cardiovascular morbidity and of sudden cardiac death, still high in this patients' group.

[Antihypertensive therapy in the elderly: results of large trials]

The aim of this review was to evaluate if antihypertensive treatment in elderly hypertensive patients is able to lower the incidence of cardiovascular events when compared to hypertensive controls who received placebo. All trials agree in that the greater blood pressure reduction in hypertensive patients randomized to active treatment is associated with a minor incidence of cerebrovascular, cardiac and all cardiovascular events in comparison to placebo-treated control groups. Therefore the chronic antihypertensive treatment makes more good than bad. All antihypertensive agents have been used for the treatment of arterial hypertension in the elderly and all have shown a good efficacy and tolerability, even if, as in the adult hypertensives, the combination of two or more agents is necessary in the great majority of hypertensive patients to reach the target blood pressure. Because life expectancy is progressively longer and the prevalence of hypertension, in particular isolated systolic hypertension, is age-dependent, it is clinically relevant to investigate if there is an upper limit for the benefit of antihypertensive therapy. The results so far available suggest a benefit up to the age of 80 years, while an ongoing study is aimed at evaluating the benefit of antihypertensive therapy in patients > 80 years. Finally, according to our personal point of view, there are sufficient data to sustain the indication of a diastolic blood pressure reduction between 80 and 90 mmHg, while the indication to a reduction in systolic blood pressure below 140 mmHg is less strong and supported.

Different baseline sympathovagal balance and cardiac autonomic responsiveness in ischemic and non-ischemic congestive heart failure

BACKGROUND

A profound autonomic unbalance is present in heart failure: its correlation with the etiology of the disease has never been investigated.

AIMS

We characterized the sympatho-vagal balance and autonomic responsiveness of 42 patients (21 with ischemic heart failure, 21 with idiopathic dilated cardiomyopathy). Patients had comparable NYHA class, ejection fraction, exercise pVO(2), exercise ventilatory response, incidence of beta-blocking treatment. None showed periodic breathing or nocturnal arterial desaturation.

METHODS

Heart rate variability was assessed in the time and frequency domain during: (1) 10 min of quiet supine resting and free breathing; (2) 10 min of regular breathing at a frequency of 20 acts/min (=parasympathetic stimulus); and (3) 10 min of active standing (=sympathetic stimulus). The ratio of the low- to high-frequency components of each autospectrum obtained in the frequency domain (LF/HF) was used as an index of sympathovagal balance.

RESULTS

Patients with ischemic heart failure had a greater baseline sympathetic activation (higher LF/HF) than those with idiopathic dilated cardiomyopathy, maintaining some parasympathetic responsiveness as well (reduced LF/HF with regular breathing).

CONCLUSIONS

There is a distinct autonomic control according to the etiology of heart failure, a finding that may help understanding its pathophysiology, and could be useful in the clinical management of patients.

[Maternal cardiac arrhythmias in pregnancy]

During pregnancy an increased incidence of maternal cardiac arrhythmias is observed. These include a wide spectrum, from clinically irrelevant isolated premature beats to debilitating supraventricular and ventricular tachycardias. In principle, management of arrhythmias during pregnancy is similar to that in non-pregnant patients. However, special consideration should be given to foetal age and potential teratogenic and haemodynamic adverse drug effects on the foetus. Therapeutic strategy should be guided by interdisciplinary consulting (i.e. cardiology, obstetrics, neonatology). Diagnostic evaluation must rule out underlying cardiovascular, pulmonary, endocrine or metabolic diseases. Additionally, precipitating factors such as excessive caffeine and/or alcohol ingestion and cigarette smoking should be avoided. For benign arrhythmias a conservative approach is appropriate. Antiarrhythmic drug selection depends on the specific arrhythmia being treated and the cardiac condition of the mother and the foetus. Some antiarrhythmic agents, such as propranolol, metoprolol, digoxin and quinidine, have been extensively tested during pregnancy and have proven to be safe; they should therefore, whenever possible, be used as firstline. For supraventricular tachycardia, intravenous adenosine may be used to terminate the arrhythmia if vagal manoeuvres fail. In emergency situations cardioversion may be performed with relative safety. Implantable cardioverter defibrillators as a preventive measure for life-threatening arrhythmias in pregnant patients do not seem to increase the risk of major complications.

Resolution of protein-losing enteropathy with standard high molecular heparin and urokinase after Fontan repair in a patient with tricuspid atresia

At 6 years of age, a girl with tricuspid atresia underwent a Björk modified Fontan procedure with implantation of a Carpentier Edwards bioprosthesis between the right atrium and the right ventricle. Ten years later she developed increasing edema, ascites and pleural effusions. The work-up showed severe stenosis of the bioprosthesis and protein losing enteropathy with a massive decrease of the albumin level to 14 g/l (normal 40-50 g/l). At 17 years of age, the bioprosthesis was replaced with a direct anastomosis between the cavoatrial junction and the right pulmonary artery. Within one month post-operatively, extensive thrombosis of the superior vena cava, anonymous and subclavian veins occurred. Protein-losing enteropathy persisted with an albumin level of 17 g/l. Parallel to the successful treatment of these thrombi with high molecular heparin and urokinase, protein losing enteropathy and hypoalbuminemia resolved completely as long as the antithrombotic treatment with high molecular heparin was continued. Oral anticoagulation was ineffective. Chronic antithrombotic treatment with high molecular heparin may thus be the treatment of choice in these forms of protein-losing enteropathy associated with venous thrombosis.

Long-term lifestyle changes maintain the autonomic modulation induced by rehabilitation after myocardial infarction

The altered autonomic balance observed after myocardial infarction is shifted toward a higher parasympathetic tone by rehabilitation. This effect persists after 1 year, however we observed a discrete variability in the long-term sympathovagal balance among patients. We postulated that such variability derives from the disparate adherence of patients to lifestyle prescriptions regarding exercise continuance and smoking avoidance. To test this hypothesis, we reviewed the data of 40 patients, who completed with a favourable autonomic modulation the initial rehabilitation phase after myocardial infarction and underwent the annual follow-up. One year after infarction, 23 patients complied to the advice about regular exercise and smoking avoidance (adherent, Group 1); 17 did not (non-adherent, Group 2). Groups were similar for age, site of infarction, left ventricular function, stress test duration and therapy. The ratio LF/HF, derived from the power spectral density of RR intervals variability, was used as an index of the sympathovagal balance. It was obtained from 15 min of ECG at rest, assessed 1 month after MI (baseline), and repeated 3 months (rehabilitation) and 1 year (follow-up) afterwards. Rehabilitation increased parasympathetic tone in all patients, reducing LF/HF by 33%. At follow-up, this potentially favourable autonomic profile persisted only in Group 1 patients. In conclusion, after a first myocardial infarction, the persistence of the potentially beneficial effect of rehabilitation on the sympathovagal balance depends on the compliance to the lifestyle changes proposed during the initial phase.

Is systolic pressure a better target for antihypertensive treatment than diastolic pressure?

BACKGROUND

Diastolic blood pressure has been evaluated in different prospective cohort studies and in pharmacological intervention trials, which have shown the increased risk of cardiovascular events in hypertensive patients and the benefits of antihypertensive therapy.

AIMS

To show that systolic blood pressure is at least as important as, or even more important than, diastolic blood pressure as a risk factor for cardiovascular complications.

METHODS

Review of medical literature.

RESULTS

Large epidemiological trials such as the Multiple Risk Factors Intervention Trial (MRFIT) and the Framingham study have shown that systolic blood pressure is an independent, continuous and modifiable risk for all cardiovascular complications, and in elderly subjects isolated systolic hypertension is the most frequent form of hypertension. In elderly subjects the increased stiffness of large arteries is responsible for the early reflection of pulse wave and for the decrease in diastolic blood pressure due to reduced recoil of large arteries. This is summarized in the increase in pulse pressure, which is directly related to the risk of cardiovascular complications. Three large intervention trials in elderly patients with isolated systolic hypertension have shown the relevant cardiovascular benefit of pharmacological reduction of elevated systolic blood pressure and normal diastolic values: the cardiovascular benefit is similar to that found in the general hypertensive population and in elderly patients with systolic-diastolic hypertension.

CONCLUSION

Systolic blood pressure represents an important risk factor for cardiovascular events which can be prevented or reduced with pharmacological treatment.

Echocardiography in the evaluation of systolic murmurs of unknown cause

PURPOSE

Systolic murmurs are common, and it is important to know whether physical examination can reliably determine their cause. Therefore, we prospectively assessed the diagnostic accuracy of a cardiac examination in patients without previous echocardiography who were referred for evaluation of a systolic murmur.

SUBJECTS AND METHODS

In 100 consecutive adults (mean [+/- SD] age of 58 +/- 22 years) who were referred for a systolic murmur of unknown cause, the diagnostic accuracy of the cardiac examination by cardiologists (without provision of clinical history, electrocardiogram, or chest radiograph) was compared with the results of echocardiography.

RESULTS

The echocardiographic findings included a normal examination (functional murmur) in 21 patients, aortic stenosis in 29 patients, mitral regurgitation in 30 patients, left or right intraventricular pressure gradient in 11 patients, mitral valve prolapse in 11 patients, ventricular septal defect in 4 patients, hypertrophic obstructive cardiomyopathy in 3 patients, and associated aortic regurgitation in 28 patients. In 28 (35%) of the 79 patients with organic heart disease, more than one abnormality was found; combined aortic and mitral valve disease was the most frequent combination (n = 22). The sensitivity of the cardiac examination was acceptable for detecting ventricular septal defect (100% [4 of 4]), isolated mitral regurgitation (88% [26 of 36]), aortic stenosis (71% [21 of 29]), and a functional murmur (67% [14 of 21]), but not for intraventricular pressure gradients (18% [2 of 11]), aortic regurgitation (21% [6 of 28]), combined aortic and mitral valve disease (55% [6 of 11]), and mitral valve prolapse (55% [12 of 22]). In 6 patients, the degree of aortic stenosis was misjudged on the clinical examination, mainly because of a severely diminished left ventricular ejection fraction. Significant heart disease was missed completely in only 2 patients.

CONCLUSION

In adults with a systolic murmur of unknown cause, a functional murmur can usually be distinguished from an organic murmur. However, the ability of the cardiac examination to assess the exact cause of the murmur is limited, especially if more than one lesion is present. Thus, echocardiography should be performed in patients with systolic murmurs of unknown cause who are suspected of having significant heart disease.

Markers of electrical instability in hypertensive patients with and without ventricular arrhythmias. Are they useful in identifying patients with different risk profiles?

BACKGROUND

Markers of electrical instability of the ventricular myocardium, namely abnormal repolarization and late potentials, are frequently observed in patients with hypertension when both ventricular arrhythmias and left ventricular hypertrophy are present. This information cannot be extrapolated to the population of hypertensive patients with ventricular arrhythmias but without left ventricular hypertrophy.

OBJECTIVE

To evaluate QT duration, QT dispersion and the incidence of ventricular late potentials in patients with essential hypertension, already on anti-hypertensive therapy, both with and without non-sustained ventricular arrhythmia.

DESIGN

The study population consisted of 49 patients with essential hypertension who were compared to 89 control normotensive subjects both with and without frequent (> 30 per h) ventricular ectopic beats (VPBs). Patients were divided into four groups: (1) hypertensive patients without VPBs (H, n = 19), (2) hypertensive patients with VPBs (HA, n = 30), (3) normotensive subjects without VPBs (C, n = 28), and (4) normotensive subjects with VPBs (CA, n=61).

METHODS

Echocardiographic parameters, QT interval, QT dispersion and signal-averaged ECG were evaluated without withdrawing anti-hypertensive drugs.

RESULTS

In no case was left ventricular hypertrophy documented. The number of VPBs during 24 h Holter recording (median 11 343 versus 7617) and the incidence of repetitive VPBs (37 versus 46% of patients) were similar in the two groups of patients (HA versus CA). Signal-averaged ECG parameters were normal and not different between the four groups. QT interval was longer in hypertensive patients compared to controls irrespective of the presence of VPBs. QT dispersion was slightly greater in subjects with VPBs, both hypertensive and normotensive, compared to subjects without arrhythmias.

CONCLUSIONS

In patients with hypertension well-controlled by drug therapy and without left ventricular hypertrophy, frequent VPBs are not associated with markers indicating an electrophysiological substrate for re-entrant arrhythmias. However, QT prolongation suggests the persistence of a higher risk of cardiovascular mortality that is independent of the presence of VPBs.

Relationship between baseline sympatho-vagal balance and the autonomic response to cardiac rehabilitation after a first uncomplicated myocardial infarction

BACKGROUND

After a first uncomplicated myocardial infarction, cardiac rehabilitation increases the parasympathetic tone, in a direction linked to a reduced risk of sudden cardiac death. This change in sympatho-vagal balance may be related to other clinical variables. The aim of this study was to define the factors implicated in determining the autonomic response to cardiovascular rehabilitation after myocardial infarction.

METHODS

In 55 patients (39-80 years) we evaluated the modulation of the autonomic profile induced by 8 weeks of rehabilitation: we analyzed the changes in pNN50 derived from time-domain analysis (deltapNN50) and in the low frequency/high frequency (LF/HF) ratio derived from autoregressive power spectral analysis (deltaLF/HF). A control group of 15 patients not undergoing rehabilitation was also studied. Variables considered at 4 weeks postinfarction and related to deltapNN50 and deltaLF/HF ratio were: age, site of myocardial infarction, previous thrombolysis, ejection fraction, stress test duration, baseline LF/HF ratio.

RESULTS

Patients not undergoing rehabilitation did not change their autonomic profile. On the contrary, rehabilitation induced a higher vagal tone (pNN50 from 6.5 +/- 1.5 to 16.2 +/- 3.1; LF/HF ratio from 8.3 +/- 5.2 to 5.1 +/- 2.9, p < 0.05). Eleven patients (20%) had baseline LF/HF ratio exceeding the mean value by 1.5 SD (19.4 +/- 1.4): in this subgroup, pNN50 was very low. In these patients, rehabilitation increased pNN50 and decreased LF/HF ratio. Indeed, both deltapNN50 and deltaLF/HF ratio were significantly related to their baseline values (p < 0.001), even considering thrombolysis, site of myocardial infarction, age, and beta-blocker therapy.

CONCLUSIONS

After a first uncomplicated myocardial infarction, sympatho-vagal balance may be very disturbed in some patients, despite a preserved ventricular function, good exercise capability and beta-blockers. These patients should be encouraged to undergo rehabilitation, since the significant improvement in the parasympathetic tone may protect them against subsequent arrhythmic events.

Increased left ventricular dimensions in patients with frequent nonsustained ventricular arrhythmia and no evidence of underlying heart disease

INTRODUCTION

To test the hypothesis that frequent nonsustained ventricular premature beats (VPBs) in patients without underlying heart disease are the first marker of mild systolic dysfunction of the left ventricle, we evaluated whether a subclinical abnormality of left ventricular function and/or an intraventricular conduction defect was present at the first clinical documentation of the arrhythmia.

METHODS AND RESULTS

We compared 57 patients (mean age 46 +/- 14 years) with > 30 VPBs/hour and no heart disease (A) to 32 healthy volunteers (mean age 42 +/- 12 years) without arrhythmia (B). Left ventricular echocardiographic parameters and signal-averaged ECG were evaluated. Filtered QRS duration (98 +/- 10 msec in A vs 98 +/- 7 msec in B) was similar in the two groups. End-diastolic left ventricular diameter (EDLVD) was 50 +/- 6 mm in A versus 47 +/- 3 mm in B (P < 0.005); 15 patients (26%) and none of the controls had EDLVD > or = 55 mm (P < 0.005). Filtered QRS interval was longer in the subgroup of patients (n = 15) with increased EDLVD (> or = 55 mm) compared with the subgroup (n = 42) with EDLVD < 55 mm (106 +/- 9 msec vs 95 +/- 9 msec; P < 0.001) and was related to greater left ventricular mass.

CONCLUSION

We documented a subclinical but significant increase of left ventricular dimensions that suggests that frequent VPBs may be an initial marker of mild systolic dysfunction of the left ventricle. However, an effect of VPBs per se in modifying left ventricular dimensions cannot be excluded.

Effects of cardiac rehabilitation and beta-blocker therapy on heart rate variability after first acute myocardial infarction

After acute myocardial infarction (AMI), rehabilitation with physical training increases parasympathetic tone. It is unknown whether such a favorable effect of exercise on the sympathovagal balance interacts with effects of other widespread therapies, such as beta blockers. In 53 patients after a first, uncomplicated AMI, we studied the combined short- and long-term influence on heart rate variability (HRV) of rehabilitation and beta blockade. Patients were divided into 3 groups: group 1 (n = 19) underwent rehabilitation with physical training; group 2 (n = 20) was taking beta blockers and underwent rehabilitation; group 3 (n = 14) was taking beta blockers and did not enter the rehabilitation program for logistic reasons. Patients were similar as to age, site of infarction, ejection fraction, left ventricular diameter, and baseline stress test duration. Measures of HRV (obtained from a 15-minute resting electrocardiogram) were the standard deviation of the mean RR interval (RRSD), the mean squared successive differences (MSSD), the percent of RR intervals differing >50 ms from the preceding one (pNN50), the low-(LF) and high-(HF) frequency components of the autoregressive power spectrum of the RR intervals and their ratio (LF/HF). Four weeks after AMI, there was less sympathetic predominance in groups 2 and 3 (i.e., patients taking beta blockers [p <0.05]). Rehabilitation modified HRV in groups 1 and 2 (p <0.05), with signs of increased parasympathetic tone (group 1: MSSD +25%, pNN50 +69%, LF/HF -40%; group 2: MSSD +41%, pNN50 +48%, LF/HF -39%). These changes persisted in the long term. In group 3, HRV was unchanged over time. Hence, after AMI, the effects of rehabilitation and beta blockers on HRV are not redundant: their association induces a more favorable sympathovagal balance, accelerating the recovery of a normal autonomic profile.

[Influence of various antithrombotic therapy methods on the incidence of subacute coronary stent occlusions, hemorrhagic complications and length of hospitalization]

BACKGROUND

The clinical benefit of coronary stenting is reduced by the risk of thrombotic stent occlusion as well as hemorrhagic complications of intensive antithrombotic therapy. We compared the influence of different antithrombotic therapies on the incidence of post-interventional complications and in-hospital stay duration.

METHODS

After successful placement of a coronary stent, 334 consecutive patients were given different antithrombotic treatments in addition to aspirin 100 mg/d indefinitely: (1) phenprocoumon for 3 months (n = 47), (2) low molecular weight heparin 2 x 100 U/kg/d s.c. for 4 weeks (n = 90), (3) ticlopidine 2 x 250 mg/d and low molecular weight heparin 2 x 100 U/kg/d s.c. for 4 weeks (n = 72) and (4) ticlopidine 2 x 250 mg/d for 4 weeks (n = 125).

RESULTS

Major events were subacute stent thrombosis in 17 patients (5%), and severe hemorrhagic complication in 20 patients (5.9%). The incidence of subacute stent thrombosis in groups 1 to 4 was 10.6%, 11%, 1.4% and 0.8% respectively. The use of ticlopidine was associated with a significant lowering of stent occlusions in univariate and multivariate analysis (p = 0.0013). Additional uni- and multivariate predictors were stent placement as a "bail-out" procedure (p = 0.033) and in patients with acute coronary syndrome (p = 0.049). Anticoagulant therapy was associated with a higher incidence of severe hemorrhagic complications (p < 0.01) and a prolonged in-hospital stay (p = 0.01).

CONCLUSIONS

These results confirm that anti-thrombotic therapy with aspirin and ticlopidine combines low rates of subacute stent occlusion and hemorrhagic complications. Treatment with phenprocoumon and low molecular weight heparin does not improve the rate of subacute stent occlusion but increases hemorrhagic complications. Very low rates of stent occlusion permit short in-hospital stays with concomitant reduction in cost.

[The role of imaging techniques in benign breast lesions]

Imaging techniques in breast pathology represent a basic complement to clinical and histopathological examinations. The combined use of these diagnostic procedures allows in the 90-95% of all cases a preoperative diagnosis of the lesion. Our fifteen years experience, made of thousands of examinations, supported from the data from current literature lead us to stress on one side the efficacy of mammography, that may be considered one of the three basic step in the differentiation of benign from malignant lesions and on the other hand the importance of ultrasonography (US). Especially US seems to have a high sensitivity in examining the juvenile breast, which is more often source of benign pathology. Mammography, when supported by a stereotactic equipment, which enables the surgeon to perform a wire guided biopsy, may further reduce the need for intraoperative histopathological examinations, which often have to be done under general anaesthesia. Old or controversial imaging devices like thermography or diafanoscopy appear to have no more role in the preoperative diagnosis of breast masses. Newer techniques like nuclear magnetic resonance or breast scintigraphy with 99-Tc have not gained an exact role yet.

[Anti-thrombosis therapy following coronary stent implantation]

Coronary stenting has proved effective in the management of acute or imminent vessel closure after coronary balloon angioplasty. Stent implantation has also been shown to reduce the rate of restenosis. Opposing these benefits, subacute thrombotic stent occlusion is a serious and life-threatening complication which occurred at alarmingly high rates in early series. This paper reviews the contemporary strategies in the prevention of stent thrombosis, emphasizing improved procedural technique and optimal antiplatelet therapy. It is shown that these new preventive strategies led to acceptable subacute stent thrombosis rate of < or = 1%.

Enteropathogens associated with childhood diarrhea in Italy. The Italian Study Group on Gastrointestinal Infections

BACKGROUND

Infectious diarrheal diseases remain an important cause of childhood morbidity in industrialized countries. The knowledge of the etiology and epidemiology of childhood diarrhea in a given area is needed to plan any measure designed to prevent or ameliorate diarrheal illness and to develop practice guidelines for the most appropriate stool examination procedures.

METHODS

We evaluated 618 children with diarrhea and 135 controls prospectively for viral, bacterial and parasitic enteric pathogens. Diarrheagenic Escherichia coli was identified by gene probes specific to different virulence factors. Stool filtrates were examined for the presence of free bacterial toxins by a cell culture cytotoxicity assay. Clinical and epidemiologic data were recorded and analyzed in relation to microbiologic findings.

RESULTS

Enteropathogens were identified in 59% of children with diarrhea and in 10.4% of asymptomatic controls. The agents mainly associated with disease were rotavirus (23.6%), Salmonella (19.2%) and Campylobacter (7.9%). Rotavirus was significantly more frequent among children observed as inpatients whereas Campylobacter was significantly more common in outpatients. Infections with diarrheagenic E. coli, Shigella flexneri, yersinia enterocolitica, Cryptosporidium and Giardia were observed in a limited number of patients. The clinical presentation of children was not sufficiently characteristic to permit presumptive diagnosis of a specific pathogen. conversely the presence of blood and/or leukocytes in stools had a high positive predictive value for Salmonella or Campylobacter infection.

CONCLUSION

The results of this study will be useful for planning strategies to prevent and control diarrheal diseases in our country.

Detection of a vacuolating cytotoxin in stools from children with diarrhea

A cytotoxin inducing vacuolation in HEp-2 cells was detected in 19 (3.1%) of 618 stool specimens from children with diarrhea but in none of 135 from control children. Common enteric pathogens were found in only two (10.5%) of the 19 cytotoxin-positive stool specimens. The vacuoles induced by stool filtrates resembled those induced by the vacuolating toxin (VacA) of Helicobacter pylori. The vacuolating toxin was heat-labile and protease-sensitive, and it had an apparent molecular weight of > 100,000 but was not neutralized by an antiserum to H. pylori VacA. Although proper prospective case-control studies are needed to definitely assess the etiologic association between the new vacuolating cytotoxin and diarrhea, the present study suggests that microorganisms of the gastrointestinal tract produce a Helicobacter-like vacuolating toxin and may be responsible for cases of childhood diarrhea whose etiology is currently considered unknown.

Short and long term effects of exercise training on the tonic autonomic modulation of heart rate variability after myocardial infarction

We studied the effects of cardiac rehabilitation on the sympathovagal control of heart rate variability in 30 patients after a first, uncomplicated myocardial infarction. Twenty-two patients completed 8 weeks of endurance training (trained), while eight decided not to engage in the rehabilitation programme for logistical reasons, and were taken as untrained controls. Age, site of infarction, ejection fraction, ventricular diameter and stress test duration were similar in the two groups at baseline. Heart rate variability was evaluated 4 weeks after infarction before starting rehabilitation, and repeated 8 weeks and one year later in both trained and untrained patients. Measures of heart rate variability, obtained from both time- and frequency-domain analysis of a 15 min ECG recording in resting conditions, were as follows: mean RR interval and its standard deviation (RRSD), the mean square successive differences (MSSD), the percent of RR intervals differing > 50 ms from the preceding RR (pNN50), the low and high frequency components of the autoregressive power spectrum of the RR intervals and their ratio (LF/HF). At baseline, heart rate variability was similar in trained and untrained patients. In the short term (8 weeks after infarction), training increased RRSD by 25% (P < 0.01), MSSD by 69% (P < 0.01), pNN50 by 120% (P < 0.01), and reduced LF/HF ratio by 30% (P < 0.01). The effects persisted after one year in trained patients. In untrained patients, the autonomic control of heart rate variability did not change 8 weeks after myocardial infarction and was only slightly modified by time. Thus, exercise training, performed for 8 weeks after a myocardial infarction, modifies the sympathovagal control of heart rate variability toward a persistent increase in parasympathetic tone, known to be associated with a better prognosis. This may partly account for the favourable outcome of patients who undergo rehabilitation.

[Thyroid carcinoma in hyperthyroid syndromes]

The relationship between hyperthyroidism and carcinoma of the thyroid is still uncertain. The incidence of thyroid carcinoma ranges from 0.3 to 16.6%. Between 1984 and 1994 the Authors observed 9 patients affected with thyroid cancer and toxic nodular goiter (4 patients) or Basedow disease (2 patients) or scintigraphic evidence of single hyperfunctioning nodule (3 patients). Six out of the 9 cases were diagnosed as papillary cancer, while three as follicular cancer. A carcinoma was diagnosed before operation in only one case, while in the other 8 patients, the diagnosis was obtained by histological examination of the specimen. Four patients underwent subtotal thyroidectomy, while five patients underwent radical lobectomy. All patients are alive and in good health; the average follow-up was 48 months.

Derivatives of displacement obtained by direct manipulation of phase-shifted interferograms

The maps of phase derivatives are extracted here by direct manipulation of phase-shifted interferograms. There are three main advantages: There is no need for prior phase evaluation or unwrapping procedures, and only a short processing time is needed. By digital integration of the derivatives the absolute phase map can also be retrieved without unwrapping procedures. A general description of the method is presented and discussed. For example, the proposed technique has been applied to the study of the deformation of a test object by the manipulation of four phase-shifted interferograms.

Malignant arrhythmias and acute myocardial ischemia: interaction between flecainide and the autonomic nervous system

The antiarrhythmic and proarrhythmic effects of flecainide were assessed in 21 anesthetized cats. Ventricular arrhythmias can be reproducibly induced in cats by the combination of acute myocardial ischemia and sympathetic stimulation. Premature ventricular contractions (PVCs), sustained (sVT) and nonsustained (nsVT) ventricular tachycardia (VT), or ventricular fibrillation (VF) may be induced by a 1-minute left stellate ganglion stimulation during a 3-minute coronary artery occlusion. After three trials yielding consistent results, flecainide (2 mg/kg intravenous bolus plus 2 mg.kg-1.hr-1 intravenous infusion) was injected and two additional trials performed. Eight cats also underwent two trials after propranolol (0.2 mg/kg) administered while flecainide infusion was maintained. Flecainide decreased heart rate and blood pressure and slightly prolonged JTc (9%, p < 0.05). It markedly augmented QRS duration (61%, p < 0.0001), which was increased by an additional 61% (p < 0.0001) during sympathetic stimulation. VF was observed in 8 animals and never after flecainide (p < 0.05). However, after drug administration all cats had VT (2 nsVT and 6 sVT), and 5 required cardiac massage. Flecainide did not prevent the occurrence of nsVT in 6 cats, and it worsened arrhythmias by inducing VT (4 nsVT and 2 sVT) in 6 cats with only PVCs or without arrhythmias in the control trials. Propranolol, administered while flecainide infusion was maintained, prevented the increase in heart rate and the marked QRS prolongation during sympathetic stimulation (4 +/- 3 vs 52 +/- 16 msec, p < 0.05) and abolished the proarrhythmic effect of flecainide in 4 of 5 animals. Thus flecainide, despite an antifibrillatory effect, does not prevent and actually may favor the occurrence of sVT during acute myocardial ischemia and enhanced sympathetic activity. Propranolol, by countering the increase in heart rate during sympathetic stimulation, prevented the rate-dependent conduction delay and abolished the proarrhythmic effect of flecainide. The exacerbation, whenever a transient ischemic episode is accompanied by elevated sympathetic activity, of the ischemia-induced conduction delay caused by flecainide may in part explain the mortality data in the Cardiac Arrhythmia Suppression Trial.