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Biomedical subjects

R Dore

Publications and source records attributed to R Dore.

27 records · Page 2Linked to original sources
PubMed1979

[Dynamic characteristics of hockey sticks and efficacy of shooting in ice hockey].

Previous studies have established that efficiency in shooting is influenced partly by the dynamic characteristics of the stick being used and partly by the morphology of the player. The purpose of the present study was therefore to verify the hypothesis stating that flexible sticks were superior to rigid ones in respect to the proficiency of shooting of pee-wee hockey players. This study has confirmed the superiority of the flexible stick over the rigid one in terms of speed and accuracy of shooting among pee-wee hockey players. Moreover morphological parameters and muscular strength were found to play a determining role in efficiency of shooting. In fact, it was suggested that the smaller and weaker the player the more advantageous is the use of a flexible stick. Through the use of strain gages fixed to the experimental hockey sticks, it was possible to determine that the speed of shooting is directly related to the acceleration imparted to the stick during the forward phase of the movement. It was also possible to demonstrate that for a given speed of the puck the more flexible stick required a smaller force than the rigid one.

Anthropometry↗
PubMedDate not supplied

Residual mediastinal widening following therapy in Hodgkin's disease.

The chest radiograms (CXR) of 102 patients with Hodgkin's disease presenting with mediastinal involvement at diagnosis were reviewed to assess the incidence and relevance of residual mediastinal abnormalities after therapy. All patients had completed planned treatment and had no evidence of persisting extramediastinum disease at restaging. Thirty-nine cases (38 per cent) showed residual mediastinal widening at the end of therapy (minimal changes in nine and measurable changes in 30 cases). Neither presenting features nor treatment modality correlated with residual mediastinal mass on chest X-ray. The isolated intrathoracic relapse rate was 11 per cent for patients with normal mediastinum following therapy, as compared with 20.5 per cent for those with residual widening; this difference did not reach statistical significance (p = 0.3). The persistence of mediastinal abnormalities was associated with a trend towards a higher risk of intrathoracic relapse for patients with initial bulky disease (p less than 0.05) and for those with B symptoms (p = 0.07). Using thoracic CT scan for restaging (56 patients), the residual mediastinum rate rose to 70 per cent; the predictability of local relapse with this procedure was not greater than with conventional X-ray study.

Adult↗
PubMedDate not supplied

Unusual osseous changes in lumbar herniated disks: CT features.

Osseous changes in cases of lumbar herniated disks including erosion of the posterior vertebral body cortex near the herniated disk, spinal canal and intervertebral foramen enlargement, and focal sclerosis of the adjacent body are described. The changes were observed in four patients with large and old herniated disks.

Adult↗
PubMedDate not supplied

CT evaluation of myometrium invasion in endometrial carcinoma.

Myometrium invasion (M) is one of the principal prognostic factors in the early clinical stages of endometrial carcinoma and can be evaluated presurgically only by CT, although with conflicting results. We compared CT of 65 patients with early clinical stage endometrial carcinomas with the corresponding anatomopathological findings. Myometrial infiltration of the same degree may present different CT images. Therefore, we identified five fundamental CT patterns, each of which corresponded to one of the three degrees of myometrium infiltration (M1, M2, M3). Furthermore, we defined the infiltration index as the ratio of minimum free myometrium to maximum free myometrium. Overall diagnostic accuracy was 76%; however, for clinical purposes CT provided adequate guidelines for therapeutic decisions in 93% of the cases. These criteria proved to be less reliable in elderly women with atrophic myometria, especially when the neoplasia was polypoid in shape.

Adenocarcinoma↗
PubMedDate not supplied

[A comparison between quantitative computed tomography and dual-energy densitometry in the study of patients at risk for postmenopausal osteoporosis].

A comparison was made of the densitometric values of the lumbar vertebrae obtained using quantitative Computed Tomography, and those measured with dual energy X-ray absorptiometry. A selected group of patients at increased risk of developing postmenopausal osteoporosis was chosen: women who had undergone bilateral oophorectomy in child-bearing years. The densitometric data recorded revealed a considerable decrease in bone mass, in particular in the cancellous portion of the vertebrae (a 17% change in the quantitative Computed Tomography value and a 13% decrease in that of dual energy X-ray absorptiometry a one year after oophorectomy). Although quantitative Computed Tomography and dual energy X-ray absorptiometry demonstrated a similar trend in bone mass reduction, given the marked and unexplained variability of both absolute values and percent variations, it was impossible to establish a clinically useful mathematical correlation between the two sets of data. Quantitative Computed Tomography is the densitometric procedure of choice to study metabolic bone disorders that involve mainly tha cancellous portion, such as postmenopausal osteoporosis. Nevertheless, given its accuracy, short execution time, lower radiation dose required, as well as good sensitivity in the measurement of bone mass variations, it would seem that dual energy X-ray absorptiometry could also find a place in clinical studies on postmenopausal osteoporosis.

Absorptiometry, Photon↗
PubMedDate not supplied

Spontaneous splenic rupture during induction chemotherapy for acute promyelocytic leukemia successfully treated with splenectomy.

We report a case of acute promyelocytic leukemia who suffered spontaneous splenic rupture with massive hemoperitoneum while receiving intensive induction chemotherapy. Emergency computed tomography of the abdomen helped in the diagnosis of intra-abdominal bleeding. The patient was successfully treated with immediate splenectomy and made an uneventful postoperative recovery. Ten days after surgery chemotherapy could be resumed and complete remission was achieved. Although spontaneous splenic rupture is a rare complication of hematologic malignancies, this diagnosis should be considered in all patients with leukemia who develop acute abdominal pain with hypotension, even in the absence of splenomegaly.

Adult↗