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Biomedical subjects

L Basano

Publications and source records attributed to L Basano.

16 recordsLinked to original sources
PubMed2001

Pulsatile electrical impedance response from cerebrally dead adult patients is not a reliable tool for detecting cerebral perfusion changes.

The original objective of this work was to verify the possibility of using electrical pulsatile cerebral impedance measurements as a diagnostic aid for assessing the brain-death condition in adults; a subordinate target was to validate a simple method for detecting perfusional changes in the brain. To this end, impedance signals were recorded, for a comparative study, from both live subjects and brain-dead patients, using a simple four-electrode arrangement. Rather unexpectedly, pulsatile transcephalic impedance waveforms exhibiting a temporal dependance similar to those of live subjects were detected in artificially ventilated, cerebrally dead, adult subjects; distributions of the time delays between impedance peaks and ECG peaks were also recorded for the two groups (dead and live subjects). These data provided no evidence, at the 1% significance level, against the hypothesis that the two sample groups are drawn from identical populations. The detection of impedance variations from brain-dead patients can be explained by the residual persistence of blood flow through the scalp, by mechanical variations synchronous with the heart beat and by the presence of the oscillating flow and the systolic spikes that precede the final blood flow arrest. The fact that impedance variations can be traced back to a multiplicity of causes, unrelated to the normal unidirectional flow, renders the transcephalic impedance method inappropriate for detecting cerebral perfusion changes in adults. This conclusion is also strengthened by some theoretical results recently derived from a multilayer model of the head.

Adult↗
PubMed1999

Cerebral blood-flow monitor for use in neonatal intensive care units.

The implementation of a real-time multichannel system for monitoring cerebral blood-flow is described. The instrument relies on a completely modular architecture and is based on the principle of measuring the electrical impedance between a number of periodically sensed electrode pairs positioned around the subject's head. The whole setup is controlled by a host computer that performs several functions, such as real-time acquisition, analysis, display and data logging. Two operating options can be chosen by the user: a normal mode that allows continuous monitoring and a triggered mode in which the measurement cycle is automatically started by the occurrence of a preset condition in some other circulatory signal, e.g. the permanently available ECG signal. The design is considerably user-friendly and embodies a number of special safety precautions to take account of the peculiar condition of patients, usually newborn infants hospitalized in intensive care units.

Cerebrovascular Circulation↗
PubMed1998

Real-time spectral analysis of HRV signals: an interactive and user-friendly PC system.

We present a real-time system, built around a PC and a low-cost data acquisition board, for the spectral analysis of the heart rate variability signal. The Windows-like operating environment on which it is based makes the computer program very user-friendly even for non-specialized personnel. The Power Spectral Density is computed through the use of a hybrid method, in which a classical FFT analysis follows an autoregressive finite-extension of data; the stationarity of the sequence is continuously checked. The use of this algorithm gives a high degree of robustness of the spectral estimation. Moreover, always in real time, the FFT of every data block is computed and displayed in order to corroborate the results as well as to allow the user to interactively choose a proper AR model order.

Calibration↗
PubMed1995

An instrument for real-time spectral estimation of heart rate variability signals.

A Digital Signal Processor (DSP)-based instrument is proposed for estimating and displaying the Heart Rate Variability (HRV) spectrum in real-time. It consists of an intelligent module which is properly interfaced to an IBM PC and whose operations are independent from the computer's other tasks. In this way, the simultaneous recording of the ECG sequence, needed for the more complete off-line analysis, can be performed by the same host. The employed hybrid spectral estimator (in which a classical FFT analysis follows the autoregressive extrapolation of data) appears to be the most apt for the present fixed point arithmetics implementation. The reliability of the instrument and its accuracy are checked both with suitable test signals and by comparison with the results obtained through off-line analysis of the same ECG tracks. The instrument is presently used for cardiovascular investigations, in particular for quickly picking patients with cardiac autonomic neuropathy (CAN) out of a population of diabetic subjects.

Adult↗
PubMed1994

[The clinical evaluation of acetoxyethylcefuroxime in dentistry].

The study examines the use of an oral antibiotic with a wide spectrum of action tested in dentistry belonging to the cephalosporin class: acetoxyethylcefuroxime. The pharmaceutical industry has succeeded in synthesising a prodrug of parenteral cephalosporin "Metoxyrinic cefuroxime sodium", thus resolving the problems presented by earlier molecules such as: scarce bioavailability, poor palatability and collateral effects at a gastroenteric level. This is a 2nd generation cephalosporin whose mechanism of action consists in the capacity to selectively block the synthesis of the peptidoglycan, a fundamental component of the cell wall of both Gram+ and Gram- bacteria. The study, which was performed in the Division of Odontostomatology of the Mauriziano Hospital in Turin, examined 59 patients suffering from some of the most commonplace dental pathologies such as: apical periodontitis-alveolitis-odontogenic abscesses-eighth teeth in dysodontiasis-maxillary cysts. The following clinical parameters were evaluated in both outpatients and those undergoing surgery: swelling, pain, lymphoadenopathy at the start of treatment, and at days 3 and 5 of treatment. A 250 mg tablet was administered every 12 hours for 5 days. Owing to the rapid resolution of symptoms and the limited collateral effects observed, the authors conclude that the drug may be regarded as the elective form of treatment.

Adolescent↗
PubMed1994

[Paget's disease with an exclusively maxillary location. A case report].

The authors illustrate a case report of Paget's disease in an exclusively cranio-facial localisation. Paget's disease is a dystrophy of an osteo-condensing type. Excess bone remodelling activity, due primarily to hyperclastic hyperactivity, leads to accelerated resorption and excess tissue formation. This marked alteration of the metabolism causes the hypertrophy of the bones involved, with zones of greater density and increased vascularisation. Its clinical manifestations include morphological deformations and painful symptoms in the areas affected. Complications may include pathological fractures, medullary or radicular compression, heart failure (rare), sarcomatous transformation (approximately 1% of cases). The case reported here describes a 70-year-old who was admitted to the out-patient clinic of the Odontostomatological Division of the Ospedale Mauriziano in Turin for a dental check up. The patient had had 6 teeth removed during the past 2 weeks in a private clinic. At the time of the control a mucous crater was present, also involving the underlying bone, at the level of the extracted 2.6 tooth. The patient had kept the teeth which had been removed some of which showed that the roots were surrounded by alveolar bone. A dental panoramic x-ray and cranial x-ray were performed using 3 projections and showed the remodelling of the cranial theca and upper jaw. The suspicion of Paget's disease was confirmed by hematochemical tests, bone scintigraphy with calcium phosphate and by the histologic examination of the alveolar bone fragments adhering to the root surface of the extracted teeth.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1988

Edge-detection schemes highly suitable for hardware implementation.

Two schemes for edge detection of real images based on gradient maxima are presented. Images are filtered with narrow filters to increase localization. Experimental results and theoretical considerations suggest that the exact shape of the filter is not critical for good performance of the algorithm. Therefore a filter can be chosen to allow for a highly efficient hardware implementation, for example, a binary filter or a 4-bit finite-impulse-response filter. Because the digitized values of a binary filter are powers of 2, the hardware implementation does not require time-consuming computations, such as multiplication and time shift, but just appropriate addressings. The performance of this scheme, or a similar scheme using 4-bit filters, is as satisfactory as that of more sophisticated schemes. Therefore these low-cost schemes are likely to be more suitable for hardware implementation.

Algorithms↗
PubMedDate not supplied

[DMFT. Relations between different epidemiological studies].

An epidemiological study was carried out on a sample of 531 children aged between 7 and 10 in Val Pellice (TO). Analysis of their DMFT showed-data that were no different to those reported in similar studies carried out in Northern Italy.

Child↗