The objective of this study was to evaluate the impact of hydroxyapatite coating of newly designed osseointegrated fixtures' abutments on the postoperative complication rates. The integrity of peri-implant microcirculation was used as a marker to compare tissue viability after different surgical techniques. Laser-Doppler Flowmetry (LDF) measures alone, and coupled with heat provocation tests were applied to test the different microcircular patterns. Measures for 17 consecutively implanted patients (8 women, 9 men, ages ranged from 18 to 77 years) were recruited; seven with soft tissue reduction (STR); and 10 with soft tissue preservation (STP).Thirteen non-operated retro-auricular areas were examined as naive controls. In isotherm conditions the baseline blood flow remained stable in all groups. The naive control patients demonstrated significant changes of blood flux in the intact skin. The non-implanted yet previously operated contralateral sides of the patients demonstrated marginally lower (p = 0.09) blood flux index. The STR sides however, showed significantly lower (average 217 %) provoked blood flux compared to controls (p < 0.001). At the STP sides a maladaptation could be observed (average 316 %) compared to the contralateral sides (p = 0.53). STP sides demonstrated a significantly better blood flow improvement compared to the STR sides (p = 0.02). These results suggest a favorable postoperative condition of vascular microcirculation after STP, than after STR surgery. The possibly faster wound healing and lower potential complication rate may widen the inclusion criteria and maybe beneficial for the patient compliance with a better quality-of-life.
BackgroundPassive transcutaneous osseointegrated hearing implant systems have become increasingly popular more recently. The area over the implant is vulnerable due to vibration and pressure from the externally worn sound processor. Good perfusion and neural integrity has the potential to reduce complications. The authors’ objective was to determine the ideal surgical exposure to maintain perfusion and neural integrity and decrease surgical time as a result of reduced bleeding.MethodsThe vascular anatomy of the temporal-parietal soft tissue was examined in a total of 50 subjects. Imaging diagnostics included magnetic resonance angiography in 12 and Doppler ultrasound in 25 healthy subjects to reveal the arterial network. Cadaver dissection of 13 subjects formed the control group. The prevalence of the arteries were statistically analyzed with sector analysis in the surgically relevant area.ResultsThe main arterial branches of this region could be well identified with each method. Statistical analysis showed that the arterial pattern was similar in all subjects. The prevalence of major arteries is low in the upper posterior area though large in proximity to the auricle region.ConclusionsDiverse methods indicate the advantages of a posterior superior incision because the major arteries and nerves are at less risk of damage and best preserved. Although injury to these structures is rare, when it occurs, the distal flow is compromised and the peri-implant area is left intact. Hand-held Doppler is efficient and cost-effective in finding the best position for incision, if necessary, in subjects with a history of surgical stress to the retroauricular skin.Trial registrationThis was a non-interventional study.
Célkitûzés-Bár a szédülés a leggyakrabban elôforduló panaszok egyike, a vestibularis perifériák hirtelen kialakult tónusaszimmetriája hátterében mégis ritkán találunk perifériás eredetû betegséget utánzó malignus koponyaûri tumorokat. Dolgozatunk egy heveny vestibularis szindróma klinikai képében jelentkezô, késôi, temporalis csontot is beszûrô, disszeminált, generalizált mikrometa sztá zi sokkal járó meningitis carcinomatosa esetet mutat be, ami egy primer pecsétgyûrûsejtes gyomorcarcinoma fel ébredését követôen jelent meg. Kérdésfelvetés-Célul tûztük ki, hogy azonosítjuk azon patofiziológiai folyamatokat, melyek magyarázatul szolgálhatnak a daganat felébredésére, disszeminációjára. A vestibularis tónusaszimmetria lehetséges okait szintén vizsgáltuk. A vizsgálat alanya és módszerei-Ötvenhat éves férfi betegünk interdiszciplináris orvosi adatait retrospektíven elemeztük. Összegyûjtöttük és részletesen újraértékeltük az eredeti klinikai és patológiai vizsgálatok leleteit, majd új szövettani festésekkel és immunhisztokémiai módszerekkel egészítettük ki a diagnosztikus eljárásokat. Background-Although vertigo is one of the most common complaints, intracranial malignant tumors rarely cause sudden asymmetry between the tone of the vestibular peripheries masquerading as a peripheral-like disorder. Here we report a case of simultaneous temporal bone infiltrating macro-metastasis and disseminated multiorgan micro-metastases presenting as acute unilateral vestibular syndrome, due to the reawakening of a primary gastric signet ring cell carcinoma. Purpose-Our objective was to identify those pathophysiological steps that may explain the complex process of tumor reawakening, dissemination. The possible causes of vestibular asymmetry were also traced. Methods-A 56-year-old male patient's interdisciplinary medical data had been retrospectively analyzed. Original clinical and pathological results have been collected and thoroughly reevaluated, then new histological staining and immunohistochemistry methods have been added to the diagnostic pool. Results-During the autopsy the cerebrum and cerebellum was edematous. The apex of the left petrous bone
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