High frequency repetitive transcranial magnetic stimulation decreases cerebral vasomotor reactivity.

OBJECTIVE: Repetitive Transcranial Magnetic Stimulation (rTMS) has been recently employed as a therapeutic strategy for stroke, although its effects on cerebral hemodynamics has been poorly investigated. This study aims to examine the impact of high frequency rTMS on cerebral vasomotor reactivity (VMR). METHODS: Twenty-nine healthy subjects were randomly assigned to real (19) or sham 17-Hz rTMS, applied on primary motor cortex (M1) of the dominant hemisphere. All subjects underwent Transcranial Doppler of the middle cerebral arteries to evaluate mean flow velocity and VMR before (T(0)) and within 10 min (T(1)) following rTMS. Four subjects underwent further VMR evaluations at 2 (T(2)), 5 (T(3)) and 24 h (T(4)) after rTMS. As a control condition, 10 subjects underwent real (5) or sham rTMS on calcarine cortex. In addition, five acute stroke patients underwent five daily rTMS sessions on the affected hemisphere mimicking a therapeutic trial. RESULTS: Following real rTMS on M1 (p=0.002) and calcarine cortex (p<0.001) VMR decreased with respect to T(0) in both hemispheres, while no change was observed after sham rTMS (p>0.6). VMR tended to remain lower than T(0) until T(3.) Cerebral VMR decreased independently of the stimulated side also in the patients' group. CONCLUSIONS: High frequency rTMS reduces cerebral VMR, possibly as a secondary effect on autonomic control of cerebral hemodynamics. SIGNIFICANCE: The effect of rTMS on cerebral hemodynamics should be carefully considered before proceeding toward a therapeutic application in stroke patients.

Occupational asthma caused by soybean hull: a workplace equivalent to epidemic asthma.

A case showing that soya hull exposure at work causes occupational asthma without flour-related bronchoconstriction.

Two functional assays of sperm responsiveness to progesterone and their predictive values in in-vitro fertilization.

We have recently reported, in a small cohort of subjects, that acrosome reaction (AR) and intracellular free calcium ([Ca2+]i) increase in response to progesterone were significantly correlated with in-vitro fertilization (IVF) rate. In the present study we extended these results to 90 subjects undergoing IVF. We confirm that both parameters were highly significantly correlated with the fertilization rate (P < 0.001). In particular, significantly lower responses to progesterone were detected in subjects with a fertilization rate < 50%, further enlightening the functional significance of sperm responsiveness to progesterone with respect to the process of fertilization. Moreover, we report here that both tests are highly discriminant of fertilization success, with positive predictive values > 90% for [Ca2+]i values which increase by > 1.2-fold and AR inducibility > 7% (cut-off values). Conversely, AR following challenge with the calcium ionophore A23187 was less significantly correlated with the percentage fertilization rate (P < 0.05), and showed lower predictive values than response to progesterone. All these tests ([Ca2+]i increase in response to progesterone, AR in response to progesterone and to A23187) appear highly sensitive and moderately specific. The positive predictive value may rise to > 95% when the combination of two tests ([Ca2+]i and inducibility of AR in response to progesterone) is considered. No correlation with fertilization rate has been found for spontaneous AR or basal [Ca2+]i. In conclusion, we propose that assessment of human sperm responsiveness to progesterone may be clinically useful in predicting fertilizing ability in vitro.

Comparative analysis between clinical requests and magnetic resonance imaging results in neurological diseases.

In order to rationalize the use of MR, which is a high cost technology and not widely available, we analysed comparatively the reasons of test requests and MR diagnosis. We selected three groups of motivations for requests: diagnosis, symptoms and aspecific symptoms: they all were related with MR results classifying concordance, negativity and discordance groups. The results were evaluated also considering whether the patients were hospitalized or outpatients and in relation to the brain, the cervical, thoracic and lumbar regions. Within the general group we found a negativity of 36%, which increases to 52.5% if the motivation of the exam was a symptom and to 88% if the symptom was aspecific, whereas it fell to 26% with the request belonging to the group diagnosis. Concordance was higher in the brain and in the cervical spine (62% and 61%) whereas it was 46% in thoracic and lumbar spine and higher, even if not statistically significative, in the group of hospitalized patients compared to the outpatients.

Development of thyroid disease in patients with primary and secondary Sjögren's syndrome.

Autoimmune thyroid disease associated to Sjögren syndrome (SS) may be defined by serological and functional abnormalities. We studied the prevalence of serum anti-thyroid autoantibodies and the development of thyroid functional defects by a follow-up investigation in patients with primary (pSS) and secondary SS (sSS). In keeping with previous literature data, our findings confirmed an increased prevalence of thyroid autoimmune phenomena in the whole series of patients with SS. In addition, evidence was provided for a greater incidence of serological and functional thyroid abnormalities in pSS when compared to sSS. Follow-up study also showed that the rate of thyroid autoimmune disease development was higher in pSS than in sSS. The appearance of circulating anti-thyroid antibodies was particularly frequent in patients with preexisting antibodies against extractable nuclear antigens (anti-ENA). These data indicate the need for a careful monitoring of thyroid function in SS patients, with particular regard to those with pSS and positive anti-ENA tests.