Biomedical subjects

S Massi

Publications and source records attributed to S Massi.

6 recordsLinked to original sources

PubMed2001

Symptoms and neurophysiological picture of carpal tunnel syndrome in pregnancy.

OBJECTIVE: To evaluate the incidence of carpal tunnel syndrome (CTS) in pregnancy through a validated and multiperspective assessment of CTS. METHODS: During 2000, the Italian CTS study group focussed on the occurrence of CTS in women during the final stages of pregnancy, enrolled in 7 Italian centers. In addition to the physician-centered and neurophysiologic traditional evaluations, we used a validated patient-oriented measurement to obtain more comprehensive and consistent data for severity of symptoms and functional impairment. RESULTS: In our study, CTS was clinically diagnosed in more than half of women (62%). Neurophysiological evaluation provided diagnosis of CTS in around half of women (43% were positive in one hand at least). Our study provides evidence, reported here for the first time, of a correlation between edema and neurophysiological picture. Similarly, our study provides a correlation between validated patient-oriented measurement and edema. Moreover, a significant correlation between a negative trend (subjectively assessed) and smoking and alcohol consumption was observed. CONCLUSIONS: Our observations confirm that the edema of the tissues in the carpal tunnel could induce a mechanical compression of the nerve. Moreover, our data suggest that smoking and alcohol consumption have a negative role in the evolution of the syndrome probably due to impairment of the microcirculation.

Adult↗

PubMed1996

Smooth-pursuit eye movement and saccadic intrusions in obsessive-compulsive disorder.

Although several reports agree that smooth-pursuit eye movement (SPEM) is abnormal in some obsessive-compulsive disordered (OCD) patients, differences between treatments and lack of accuracy in control selection make the results controversial. Although reduced gain seems the most accepted abnormality, the characteristics of saccadic disruption of smooth pursuit are as yet unspecified. SPEMs in 21 OCD patients (DSM-III-R) and 21 healthy subjects recruited from the community were studied through a multiple target velocity task . The two groups were individually matched on age, gender, and level of education. None of the subjects had a history of substance dependence apart from the smokers who refrained from smoking in the 2 hours prior to the test. A significantly lower SPEM gain and increased number and frequency of anticipatory saccades (ASs) was found in OCD patients as compared with control subjects. No relationship emerged between eye movement abnormalities and clinical variables explored.

Adult↗

PubMed1992

Effects of oxcarbazepine and carbamazepine on the central nervous system: computerised analysis of saccadic and smooth-pursuit eye movements.

Oxcarbazepine (OXC) is a new anti-epileptic agent structurally related to carbamazepine (CBZ). OXC seems to have a similar efficacy and a better tolerability profile than CBZ. In the present study we compared the subclinical side-effects on the CNS of OXC and CBZ using a computerised analysis of saccadic and smooth-pursuit eye movements. Six healthy male volunteers (mean age 29 yrs) participated in the study, which was conducted by a double-blind cross-over design. Each subject was given a single dose of either CBZ 400 mg or OXC 600 mg (according to the random assignment) after which the drug effects on eye movements were evaluated. One week later, the trial was repeated using the other drug. The parametrisation of both saccadic and smooth-pursuit eye movements was carried out by measuring a series of performance parameters [e.g. the maximum saccade peak velocity (MSPV) and the typical target velocity (TTV)]. OXC was found to induce a lesser degree of alteration on the values of both MSPV (p = 0.07) and TTV (p less than 0.03) than CBZ. In particular, the TTV values were virtually unaffected by OXC administration, while the effects of CBZ on both variables were particularly evident at 8 and 10 h after dosing which correspond to the time at which the plasma concentrations of CBZ and of its 10,11-epoxide reach the peak. In conclusion, our preliminary results indicate that OXC induces negligible alterations, if any, on the eye movement parameters evaluated in our study.

Adult↗

PubMed1991

Comparison of two nonlinear models for fitting saccadic eye movement data.

Saccadic eye movements are rapid shifts in the direction of gaze which are being studied increasingly for clinical and pharmacological purposes. The evaluation of the relationship between amplitude and peak velocity of these ocular movements (the so-called 'main sequence' plot) is particularly useful for characterising the saccade pattern in individual patients. This relationship is nonlinear and the peak velocity tends to achieve an asymptote for high values of amplitude. Since a standard parametrisation of the main sequence based on specific mathematical models has not yet been achieved, in the present study two simple models based on the Michaelis-Menten equation and on an exponential equation are proposed together with their implementation on a microcomputer. Two microcomputer programs are described which estimate the model parameters from the experimental data of the patients using a weighted nonlinear least-squares fit. The two procedures have been tested and compared in a series of 23 healthy volunteers. The following results (mean +/- S.D.) were obtained: Michaelis-Menten model. Km (degrees) = 31.2 +/- 7.7, Vmax (degrees/s) = 841.0 +/- 165.5, root-mean-squared error(%) = 6.0 +/- 1.6; exponential model. K (degrees) = 23.4 +/- 4.6, Vmax (degrees/s) = 578.0 +/- 97.4, root-mean-squared error(%) = 5.4 +/- 1.6. The two techniques of parametrisation provided similar indices of intra-individual variability in 4 healthy volunteers. In conclusion, our methods for saccade parametrisation can be regarded as simple but efficient tools for facilitating research on these ocular movements.

Adult↗

PubMedDate not supplied

[Alterations of smooth-pursuit ocular movements in Alzheimer's disease].

Recent findings suggest that patients affected by Alzheimer's disease (AD) have evident alterations of smooth-pursuit ocular movements induced by a sinusoidal predictable target. For a better understanding of the possible modifications of this performance in patients with AD we evaluated, using a quantitative method, the smooth-Pursuit induced by ramps with constant, unpredictable velocities. Twelve patients with probable AD were studied. These patients were compared with twelve age matched healthy volunteers. Visual inspection of our recordings shows that AD patients have frequent, large saccades intrusions which in some cases appeared to disrupt smooth tracking, particularly for low target speeds. Furthermore, the smooth-pursuit eye velocity induced by target of high speed is significantly reduced in respect to that present in our control group. Some significant correlations between altered smooth-pursuit parameters and abnormal psychometric scores were noted.

Aged↗

PubMedDate not supplied

[MRI and HM-PAO SPECT in 20 patients with drug-resistant partial epilepsy].

Twenty consecutive patients with chronic partial seizures with onset before twenty years of age were investigated by means of 0.5 T MRI (20) and HM-PAO (19) in order to identify focal alterations amenable to surgical therapy. MRI evidentiated parenchymal lesions in 7 patients. Findings consistent with unilateral medial temporal sclerosis and cortico-subcortical parietal scars were found in two patients each. Small solid nodular lesions in the temporal lobe were observed in two patients. These and one additional patient with nodular partially cystic lesions in temporal lobe were administered a paramagnetic contrast agent (Gadolinium DPA) intravenously. In one case a contrast enhancement was observed. Histologic examination post surgery revealed a low grade glioma in one patient. HM-PAO SPECT examination showed area of abnormal captation in 9 of 19 patients. Aspects of EEG correlation with the MRI and SPECT findings are discussed. Our data supported the usefulness of magnetic resonance and SPECT imaging in the completion of pre-surgical assessment in this kind of patients.

Adult↗