Thrombogenesis in Acute Coronary Syndromes

It is well-established that intracoronary thrombosis, which may be associated with plaque fissure and enhanced coronary vasoconstriction, is the immediate cause of a sudden impairment of regional myocardial perfusion, which is transient in unstable angina and is, eventually, irreversible in acute myocardial infarction. It is also well-known that increased platelet reactivity, increased procoagulant activity, and reduced endogenous fibrinolysis are risk factors for acute coronary events. Nevertheless, the primary causes responsible for sudden intracoronary thrombosis and for coronary vasoconstriction causing acute coronary syndromes are still largely speculative. Recent studies have shown activated inflammatory cells both in the coronary arterial wall and in the systemic circulation of patients with unstable angina. Furthermore, the intensity of the inflammatory response is correlated with an adverse prognosis. This inflammatory component may have important pathogenetic and prognostic roles because an outburst of inflammatory cytokines has the potential to increase the sensitivity of platelets to agonists, to turn the anticoagulant and vasodilator physiological properties of the endothelium into procoagulant and vasoconstrictor properties, and to cause plaque fissure by the release of proteolytic enzymes.     

Psychological and practical difficulties among parents and healthy siblings of children with Duchenne vs. Becker muscular dystrophy: an Italian comparative study

This study explored the burden in parents and healthy siblings of 4-17 year-old patients with Duchenne (DMD) and Becker (BMD) muscular dystrophies, and whether the burden varied according to clinical aspects and social resources.Data on socio-demographic characteristics, patient''s clinical history, parent and healthy children burden, and on parent''s social resources were collected using self-reported questionnaires administered to 336 parents of patients with DMD (246) and BMD (90).Parents of patients with DMD reported higher burden than those of patients with BMD, especially concerning feeling of loss (84.3% DMD vs. 57.4% BMD), stigma (44.2% DMD vs. 5.5% BMD) and neglect of hobbies (69.0% DMD vs. 32.5% BMD). Despite the burden, 66% DMD and 62.4% BMD parents stated the caregiving experience had a positive impact on their lives. A minority of parents believed MD has a negative influence on the psychological well-being (31.0% DMD vs. 12.8% BMD), and social life of unaffected children (25.7% vs. 18.4%).In the DMD group, burden correlated with duration of illness and parent age, and burden was higher among parents with lower social contacts and support in emergencies. In DMD, difficulties among healthy children were reported as higher by parents who were older, had higher burden and lower social contacts. In both groups, burden increased in relation to patient disability.These findings underline that the psychological support to be provided to parents of patients with MD, should take into account clinical features of the disease.Key words: Duchenne muscular dystrophy, Becker muscular dystrophy, parents, healthy siblings, burden, social network     

Blood pressure variability over 24 hours: its different components and its relationship to the arterial baroreflex

SUMMARY  This paper describes several different methods for the analysis of blood pressure and heart rate variability over the 24 hours, both in the time and in the frequency domain. The mechanisms possibly involved in the genesis of the variations in blood pressure and heart rate which occur over a 24-hour period are also discussed. Finally, new approaches to the dynamic evaluation of the sensitivity of baroreflex control of heart rate and of its changes over the 24 hours in daily life conditions, based on computer analysis of the interaction between fluctuations in blood pressure and heart rate, are described. Data obtained by applying these methods in different clinical conditions (normotensive vs. hypertensive subjects, young vs. elderly individuals and pure autonomic failure patients) are presented.     

OPEN RANDOMIZED COMPARISON OE ITRACONAZOLE VERSUS TERBINAEINE IN ONYCHOMYCOSIS

Background. Onychomycoses are among the most frequent nail diseases. The principal agents are dermatophytes, Itraconazole and terbinafine are two effective and systemic antimycotics. Previous trials have shown, that treatment schedules with effective concentrations for 3 months cause drug deposits in nail plates that persist 6 months after the end of the treatment. Methods. A comparative, open, prospective study was carried out with random assignment of patients. The first group included 27 patients under treatment with 200 mg of itraconazole once daily for 3 months. The second group included 26 patients treated with 250 mg of terbinafine for 3 months. Both series of patients were followed for 6 additional months. Results. Both groups were similar in age, sex, and history of onychomycosis, Trichophyton rubrum was the main isolated agent in all patients. The percentage of diseased nails was similar in both groups affecting predominantly the first toenail. Treatment was highly effective and differences between groups were not significant. The rate of adverse events was 21% in the itraconazole group and 47% in the terbinafine group. Conclusions. Itraconazole and terbinafine are two drugs of choice in dermatophytic onychomycosis.     

APOPTOSIS OF HUMAN MONOCYTES/MACROPHAGES IN MYCOBACTERIUM TUBERCULOSIS INFECTION

Tuberculosis (TB) is still a major health problem, both as a single disease entity and as a cofactor in AIDS. The interaction between macrophage and Mycobacterium tuberculosis (MTB) is a critical step in the establishment of an early chronic infection. This study analyses the capacity of MTB to induce apoptosis in cells obtained by broncho-alveolar lavage (BAL) from patients with reactive pulmonary tuberculosis and from AIDS patients with disseminated pulmonary tuberculosis. Apoptosis was increased three-fold in BAL cells obtained from patients with pulmonary tuberculosis and even more markedly in alveolar macrophages of MTB-infected AIDS patients, compared with controls. Apoptosis was analysed and characterized by propidium iodide (PI) incorporation, terminal deoxy transferase (TDT)-mediated dUTP-biotin nick end labelling (TUNEL), and tissue transglutaminase (tTG) expression. The MTB–macrophage interaction was also investigated in vitro by infecting monocyte-derived macrophages (MDM) with MTB (virulent strain H37Rv). The induction of apoptosis by MTB required viable bacteria, was dose-dependent, and was restricted to H37Rv. Infection with either Mycobacterium avium complex (MAC) or HIV-1 and treatment with heat-killed MTB failed to induce apoptosis. © 1997 by John Wiley & Sons, Ltd.     

Long-Term Follow-Up of Patients with Single Lead VDD Stimulation

The purpose of this study was to assess the long-term results of a single lead VDD pacing system (Phymos MPS) in 85 patients (48 males, 37 females, mean age 74 ± 9 years). The system, which incorporates two atrial floating electrodes (Phymos 830-S). was implanted for second- or third-degree Mobitz II AV block. The percentage of AV synchronized pacing, the presence of fusion beats due to short AV delay, and the occurrence of supraventricuiar arrhythmias was evaluated by Holter monitoring at 6-month intervals. Over a mean period of follow-up of 44 months (range 2–56), over 90% of AV synchronized pacing events were noted in 74 patients (87%). The presence of persistent fusion beats was detected in 12 patients (14%). In ten patients the pacemaker was reprogrammed to VVI mode for supraventricuiar arrhythmias (7 patients, 8.2%) or unsatisfactory atrial sensing (3 patients, 3.5%). One pacemaker was removed for pocket infection and two for battery depletion. These observations support the use of VDD single lead pacing to combine a physiological mode of stimulation with simple implantation techniques.     

Nutritional Supplements Used in Weight-reduction Programs Increase Intestinal Gas in Persons Who Malabsorb Lactose

Objective To determine if ingestion of 2 doses of milk-based dietary supplements produce gaseous symptoms in subjects who malabsorb lactose.

Design Randomized, controlled, crossover trial.

Subjects/setting Ten community-based subjects who malabsorb lactose.

Intervention Ingestion of 2 standard servings of milk-based supplements (a powder reconstituted in fat-free milk or a ready-to-drink preparation) or low-lactose control preparations.

Main outcome measures Frequency of flatus passage and subjective impression of bloating, flatulence, and abdominal discomfort.

Statistical analysis Wilcoxon signed-rank test.

Results The high lactose content (27 g) of 2 servings of the powder-based supplement ingested without other food resulted in a marked increase in daily flatus passages from the basal level of 9.7±8.2 to 30±14 (mean ±SD), and a significant increase in the subjects’ perception of gas. In contrast, the lower lactose content (18.4 g) of 2 servings of a ready-to-drink supplement resulted in a flatus frequency of 17±10 (P=.14 vs baseline) and no significant increase in the perception of increased gas. Neither supplement resulted in a significant increase in bloating, abdominal pain, or diarrhea. The lactose content of the liquid supplement was reduced by 80% following overnight incubation with an over-the-counter lactase preparation.

Applications/conclusions Persons who malabsorb lactose should be aware that sizable increases in rectal gas commonly occur when milk-based powders reconstituted in milk are used as meal replacements. In contrast, gas problems probably will be minor following ingestion of 2 doses of a ready-to-drink, milk-based supplement. The lactose content of these supplements can be markedly reduced by overnight incubation with over-the-counter lactase preparations, and this manipulation should be beneficial for subjects troubled by the increased gas caused by the consumption of lactose-containing supplements. J Am Diet Assoc. 2001;101:1447–1452.