APPLICATION OF MEASUREMENT METHODS FOR THE FREQUENCY RANGE 2-150 KHZ TO LONG-TERM MEASUREMENTS IN PUBLIC LOW VOLTAGE NETWORKS

Background The aim of this study was to evaluate long-term dilatation of Hemashield Gold and Hemashield Platinum vascular prostheses in ascending aortic position using different measurement methods to obtain precise results. Methods Between 1999 and 2007, 73 patients with Stanford type A dissection received ascending aortic replacement with Hemashield Gold and Hemashield Platinum prostheses. Measurements were performed using multiplanar reconstruction mode of electrocardiogram (ECG)-gated, multislice spiral computed tomography (MSCT) in strictly orthogonal cross-sectional planes. Different methods of measurement were compared and maximum dilatation was estimated for different time spans. Results Diameters calculated from the measured circumference showed a significant (p = 0.037) but clinically not relevant difference (0.1 mm) to the mean between the largest and the shortest cross-sectional diameter of the prosthesis. Dilatation after 24.2 ± 10.2 months was 8.5 ± 4.5%. Long-term dilatation after 91.8 ± 34 months amounted to 11.8 ± 4.2%. Conclusion Based on ECG-gated MSCT images, the presented methods of measurement provided reliable results. Long-term analysis shows low dilatation rates for Hemashield prostheses, which therefore can be considered as safe from this point of view. Nevertheless, a maximal dilatation of 20% could be relevant in valve sparing root replacement. It remains unclear if a dilatation like this contributes to the formation of suture aneurysms.

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561 Bilateral Upper Extremity Amputation After High Voltage Electrical Injury: A Case Report

Journal of Burn Care & Research ◽

10.1093/jbcr/irab032.211 ◽

2021 ◽

Vol 42 (Supplement_1) ◽

pp. S130-S131

Author(s):

Andrew Khalifa ◽

Anzar Sarfraz ◽

Jacob B Avraham ◽

Ronnie Archie ◽

Matthew Kaminsky ◽

...

Keyword(s):

Case Report ◽

High Voltage ◽

Troponin I ◽

Low Voltage ◽

Foley Catheter ◽

The United States ◽

Upper Extremities ◽

Full Thickness ◽

Electrical Injuries

Abstract Introduction Electrical injuries represent 0.4–3.2% of admissions to burn units and are responsible for >500 deaths per year in the United States. Approximately half occur in the workplace and are the fourth leading cause of work-related-traumatic death. The extent of injury can be drastically underestimated by total body surface area percentage (TBSA). Along with cutaneous burns, high voltage electrical injuries can lead to necrosis of muscle, bone, nervous tissue, and blood vessels. Aggressive management allows for patient survival, but at significant cost. Newer technologic advances help improve functional outcomes. Methods This case-report was conducted via retrospective chart review of the case presented. Results A 43-year-old male sustained a HVEI (>10, 000 V) after contacting an active wire while working as a linesman for an electric company. He presented after less than 15-minute transport from an outside hospital with full thickness burns and auto-amputation to all fingers on both hands and the distal third of the left hand (Images 1 and 2). There were full thickness circumferential burns to the entire left and right upper extremities with contractures, with the burns extending into the axilla, and chest wall musculature. The patient had 4th degree burns and a large wound to the left shoulder with posterior extension to the scapula, flank and back with approximately 25% TBSA (Image 3). Compartments were tense in both upper extremities. Patient was sedated and intubated to protect the airway and placed on mechanical ventilation. A femoral central line was then placed, and the patient was given pain control, continued fluid resuscitation, and blood products. Dark red colored urine from a foley catheter that was immediately identified as rhabdomyolysis induced myoglobinuria. Labs drawn demonstrated elevated troponin I, CK >40,000. BUN 18, creatinine 1.0, K+ 5.2 and phosphate 5.6. Decision was made immediately for operative intervention with emergent amputation of both upper extremities in the light of rhabdomyolysis secondary to tissue necrosis and oliguria. During the patient’s hospital course, he underwent multiple operations for further debridement with vacuum-assisted closure therapy and skin grafting of sites, as well as targeted muscle reinnervation (TMR) 6 months later at an outside hospital. Conclusions Although HVEI only account for a small percentage of burn admissions, they are associated with greater morbidity than low-voltage injuries. Patients with HVEI often incur multiple injuries, more surgical procedures, have higher rates of complications, and more long term psychological and rehabilitative difficulties. Despite the need for amputation in some of these critically ill patients, options exist that allow for them to obtain long term functional success.

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Short- and Long-Term Amiodarone Treatments Regulate Cav3.2 Low-Voltage-Activated T-type Ca2+ Channel through Distinct Mechanisms

Molecular Pharmacology ◽

10.1124/mol.105.021253 ◽

2006 ◽

Vol 69 (5) ◽

pp. 1684-1691 ◽

Cited By ~ 12

Author(s):

Noboru Yamashita ◽

Toshihiko Kaku ◽

Tomoko Uchino ◽

Shojiro Isomoto ◽

Hironobu Yoshimatsu ◽

...

Keyword(s):

Low Voltage ◽

Short And Long Term

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Comparison of Measurement Methods for the Frequency Range 2 – 150 kHz (Supraharmonics)

2018 IEEE 9th International Workshop on Applied Measurements for Power Systems (AMPS) ◽

10.1109/amps.2018.8494879 ◽

2018 ◽

Cited By ~ 2

Author(s):

Grevener Anne ◽

Meyer Jan ◽

Ronnberg Sarah

Keyword(s):

Measurement Methods ◽

Frequency Range

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Oscillations and Long-Lasting Correlations in a Model of the Lateral Geniculate Nucleus and Visual Cortex

Journal of Neurophysiology ◽

10.1152/jn.2000.84.4.1863 ◽

2000 ◽

Vol 84 (4) ◽

pp. 1863-1868 ◽

Cited By ~ 17

Author(s):

Kyle L. Kirkland ◽

Adam M. Sillito ◽

Helen E. Jones ◽

David C. West ◽

George L. Gerstein

Keyword(s):

Experimental Data ◽

Visual Cortex ◽

Cell Membrane ◽

Lateral Geniculate Nucleus ◽

Feedback Inhibition ◽

Frequency Range ◽

Lateral Geniculate ◽

Low Threshold ◽

Thalamocortical System

We have previously developed a model of the corticogeniculate system to explore cortically induced synchronization of lateral geniculate nucleus (LGN) neurons. Our model was based on the experiments of Sillito et al. Recently Brody discovered that the LGN events found by Sillito et al. correlate over a much longer period of time than expected from the stimulus-driven responses and proposed a cortically induced slow covariation in LGN cell membrane potentials to account for this phenomenon. We have examined the data from our model, and we found, to our surprise, that the model shows the same long-term correlation. The model's behavior was the result of a previously unsuspected oscillatory effect, not a slow covariation. The oscillations were in the same frequency range as the well-known spindle oscillations of the thalamocortical system. In the model, the strength of feedback inhibition from the cortex and the presence of low-threshold calcium channels in LGN cells were important. We also found that by making the oscillations more pronounced, we could get a better fit to the experimental data.

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