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Biomedical subjects

C Martinelli

Publications and source records attributed to C Martinelli.

At least 55 records · Page 3Linked to original sources
PubMed1986

[Computerized tomography in spinal osteoblastoma. Observations in 10 cases].

In order to stress the role of computed tomography (CT) in the evaluation of benign spinal osteoblastoma, the authors examined by CT 10 patients with surgically and histologically proved osteoblastomas of the spine. Basing on surgical and histopathological findings CT proved to be a very important method for attesting the presence of the tumors (usually showed by radiographic examination), and specially for their staging and follow-up. CT in fact showed the real extent of the tumor into the spinal canal and towards the paraspinal soft tissues, and allowed the early detection of post surgical relapses. The authors conclude that CT is a primary diagnostic modality for preoperative planning and follow-up of benign osteoblastoma.

Adolescent↗
PubMed1984

[The sinus node electrogram in the evaluation of atrial pauses].

The aim of this study was to establish the electrophysiological mechanism of atrial pauses, defined as a sudden lengthening of atrial cycle greater than or equal to 10% of its basal value. The sinus node electrogram (SNE) was recorded during electrophysiological study in 20 subjects. Satisfactory recordings of 64 pauses were obtained, 25 of which were spontaneous, 16 were induced by short periods of atrial pacing (AP) in normal subjects, whereas 23 atrial pauses were induced with the premature stimulation method. The basal sinus cycle and the one during the spontaneous pauses were measured from the upstroke slope on the SNE. The electrically induced pauses of the sinus cycle were measured from the artifact of the stimulus to the upstroke slope of the SNE of the first post-pacing beat. We have found that: 1-spontaneous atrial pauses correspond to a moderate slowing of the sinus cycle and to a depression of the sinoatrial conduction occasionally up to a second degree sinoatrial block. Only in subjects with sick sinus disease, the atrial pauses are induced by depression of the sinus automatism; 2-in normal subjects the AP results in a sinoatrial conduction delay; 3-the single extrastimulus regularly produces a moderate increase of the sinoatrial conduction time with variable but minimal effects on the sinus node automatism.

Cardiac Pacing, Artificial↗
PubMed1982

[Direct measurement of sinoatrial conduction time in man. Correlation with sinus cycle length].

Recent reports have shown that it is possible to record sinus node potential (SNP) using a transvenous electrode catheter technique in animals and in man. We applied similar techniques to record sinoatrial activity in 24 normal subjects and in 6 patients with sick sinus syndrome. We used bipolar recordings, with one interelectrode distance of 1 cm, low-pass filters of 0.1-50 Hz and high-amplification (up to 100 microV/cm). Validation of the source of the sinus node electrograms (SNE) was obtained by using ad hoc criteria. Like SNE recorded in animals, human SNE shows a smooth, low-frequency upstroke slope that begins before and merges into atrial activation. Sinus node potential is separated from preceding T wave by an isoelectric plateau. In 24 subjects with normal sinus node function, the directly recorded sinoatrial conduction time (D-SACT) was 82.9 +/- 17.9 msec. Correlation with the SACT estimated by Narula's method was excellent (r = 0,84). In 12 patients with sinus arrhythmia on SNE, SACTs were directly measured as were the associated P-P intervals. When SACT at each sinus cycle length (SCL) was plotted against SCL for all subjects grouped together, the average change of SAT per 100 msec change of SCL was 15 msec. In 6 patients with sick sinus syndrome, D-SACT was 150.4 +/- 67.4 msec. When SACT at each SCL was plotted against SCL, the average change of SACT per 100 msec change of SCL was 39 msec. In the same patients the SACT estimated by Narula's method was 129 +/- 17 msec.

Electrocardiography↗
PubMed1977

Squamous-cell carcinoma in a residual mandibular cyst.

Described is a case of squamous-cell carcinoma arising in a residual cyst in a 60-year-old edentulous woman. The clinical and radiographic diagnosis was residual cyst, and the treatment employed was conservative surgical enucleation. The cause of these changes is unknown. Theoretically, the inflammatory reaction may have been a predisposing factor.

Carcinoma, Squamous Cell↗
PubMed1977

Influence of salivary glands extirpation on procreation in rats.

The influence of extirpation of the submandibular and sublingual, parotid and all major salivary glands on pregnancy of rats was studied. The statistic analysis of the results indicated that there are statistically significant differences in the number of offsprings between before and after extirpation of the salivary glands. The parotidectomized female rats presented the smallest number of offsprings as compared with other groups and presented some progressive sterility after the gland extirpation.

Animals↗