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Biomedical subjects

R Sader

Publications and source records attributed to R Sader.

At least 37 records · Page 2Linked to original sources

[Translaryngeal tracheostomy in Bechterew's disease and Guillain-Barre syndrome].

Recently, the Translaryngeal Tracheostomy (TLT) has been developed by Fantoni [1,2]. This new technique has been suggested for long-term ventilated intensive care patients as an alternative to other minimal invasive tracheostomy techniques like the Percutaneous Dilatational Tracheostomy described by Ciaglia [3] or Griggs [4]. In comparison to these techniques, the main advantage of the TLT seems to be the access to the airway from inside the trachea to outside. This procedure minimizes the risk of luxations of parts of the tracheal wall into the tracheal lumen resulting in obstructive ventilatory problems. The often discussed risk of stomal infections associated with this technique due to a possible bacterial contamination of the mouth seems not to be clinically relevant. In the past minimal invasive tracheostomy techniques have only been recommended for patients with normal anatomical conditions and without any special risk factors. The present case report describes the successful performance of a TLT in a patient with a severe M. Bechterew and respiratory failure due to a Guillain-Barré-syndrome. This patient was at high risk for operative complications during a conventional surgical tracheostomy due to his underlying diseases.

Aged↗

Initial experience with Healthport miniMax and other peripheral arm ports in patients with advanced gastrointestinal malignancy.

While central ports are located at the chest, peripheral ports (PP) are inserted at the patients' forearms. Two new PPs (Healthport miniMax((R)) and Bard Titan Low Profile Port) and two well-established types (Port-A-Cath((R)) P.A.S. Port and PeriPort(TM) peripheral access system) were tested. 125 patients were given the choice between PP and chest ports, and 100 of them chose PP. PP were inserted in patients suffering from gastrointestinal malignancies (n = 95), AIDS (n = 3) or Crohn's disease (n = 2). The first 30 patients were prospectively monitored by repeated color-coded duplex sonography examinations in order to evaluate clinically inapparent thromboses. Easy percutaneous needle puncture as early as 1 day after surgery was possible using innovative ports with large septa. The following complications arose during 12,688 catheter placement days: difficult implantation (n = 5), intolerable pain at the insertion site (n = 1), port erosion of the skin (n = 1), catheter leaks (n = 4), disconnection of the catheter from the port (n = 1), systemic infections (n = 4), local infections (n = 6) and symptomatic deep vein thrombosis (n = 8) despite anticoagulation in 1 of these. Only systemic infections and intolerable pain resulted in PP explantation (n = 5); other complications were easily dealt with. No serious or life-threatening complications occurred.

Adult↗

[Speech rate of compensatory articulation in patients with cleft lip and palate].

Infolge eines primären Defizits der velopharyngealen Funktion liegen bei vielen Patienten mit Lippen-Kiefer-Gaumenspalten sekundäre kompensatorische Lautbildungen vor. Mit zwei neuen Computerprogrammen werden die Auswirkungen der kompensatorischen Artikulation auf die durchschnittliche Sprechgeschwindigkeit von 146 Patienten mit Lippen-Kiefer-Gaumen-spalten untersucht. Die Patienten wurden dabei nach dem Schweregrad der artikulatorischen Auffälligkeit gruppiert. Bei der schnellen Silbenwiederholung zeigte sich, dass die durchschnittliche Silbenrate pro Sekunde bei Patienten mit deutlich auffälliger Artikulation signifikant reduziert war. Beim Nachsprechen von Sätzen war die zum Nachsprechen benötigte Gesamtzeit bei dieser Patientengruppe signifikant erhöht, und das Zielwort des Satzes wurde signifikant später begonnen. Die Ergebnisse zeigen, dass die mittlere Sprechgeschwindigkeit von Patienten mit Lippen-Kiefer-Gaumenspalten mit kompensatorischer palatolalischer Artikulation niedriger ist.

Adolescent↗

[Perceptive and instrumental examination of voice quality in patients with lip-jaw-palate clefts].

BACKGROUND: In Anglo-American literature, prevalences as high as 41% are reported for voice disorders in cleft lip and palate (CLP) patients. Because of considerable variability in the reported findings and because no prevalence data are available for the German-speaking area, a screening study was conducted. METHOD: 154 patients with CLP were examined. Voice quality was assessed perceptively according to the rbh-system (roughness, breathiness, hoarseness). Suprasegmentals and nasal resonance were also assessed. Using a new computer programme for the apparative analysis of voice quality, data for pitch, intensity and pertubation (jitter and shimmer) were obtained for 4 sustained vowels. RESULTS: Based on perceptual analysis, we found that the prevalence of severe voice disorders in CLP patients was 6.5% which is lower than reported in most other studies. The incidence of voice disorders in CLP patients is numerically only slightly higher than in the normal population. The acoustic measurements confirm the results of perceptual analysis. Since the prevalence of severe voice disorders was low, none of the pertubation quotients differentiated between modal and disordered voices. A weak correlation was found between jitter and the ratings for hoarseness. CONCLUSIONS: 1. While it is appropriate to assume a higher potential risk for vocal dysfunction in CLP patients the actual prevalence in the patients examined is numerically only slightly higher than in normals. 2. For patients with voice disorders, apparative diagnostics of voice quality is a useful and practical adjunct to perceptual analysis which helps profiling individual patients and helps the professional to make decisions for therapy.

Adolescent↗

[Precision of 3D-assisted surgical planning with rapid prototype techniques].

Our clinical results show that 3D model building is an excellent method for 3D preoperative planning. Dependent on the number of steps, however, there are many possibilities of failures. Standardization and quality control of data acquisition and industrial manufacturing must be recommended. This is especially important for stereolithography, as it is definitely more complex than the milling technique. One possibility seems to be the use of phantom models. Another factor is that the surgeon has to be involved in the essential steps of data analysis and segmentation. Based on our experience, the building of 3D CT skull models is a clinically efficient method that is mature enough for clinical use, but cannot yet be accepted as the clinical routine. Quality assurance is urgently necessary.

Equipment Design↗

[Video matching as intraoperative navigation aid in operations to improve the facial profile].

Planning and simulation of individual interventions are not yet the common standard treatment in general surgery. Improvements in planning and simulation of individual orthognatic and craniofacial interventions have led to the need to transfer the results of preoperative planning to the location. Videomatching offers a new approach to the surgeon so that simulation output can be used in a highly intuitive way. Congruent video superimposition of the real site and a view of the simulation give the surgeon a unified view of both domains. Visual merging is immediately accepted by the surgeon who prefers the intuitive, non-tactile nature of this highly informative navigational aid. Application and positioning of anatomical markers and time-consuming calibration procedures can be reduced to a minimum. Alternative plans can be discussed among several surgeons preoperatively, and different therapeutic concepts solidified in various simulation models can be selected intraoperatively. We concentrate on the application of this new method in craniomaxillofacial surgery, but it is applicable in other disciplines as well.

Calibration↗

[Computer-assisted documentation of mandibular fractures].

For the registration, documentation and evaluation of patient data in cranio-maxillo-facial (cmf) trauma surgery a Windows-based application front end for relational data base systems (RDBS) has been developed. A simple-to-learn, easily reconfigurable user interface can be adjusted to the dynamically changing needs of individual departments. A graphical user interface (GUI) eases the entry of complex information like fracture positions, the location of implanted osteosynthesis material, etc. The new program also simplifies the daily routine documentation tasks. Being linked to a Hospital Information System (HIS) it makes use of the patients' individual base data stored there. Statistical data for various studies can be extracted from the database. The program has been successfully tested on a collective of 1.178 cmf trauma patients. Predefined analyses can be generated now by the simple click of a button for various case selections. New users learn to operate the program in a very short time.

Computer Graphics↗

[Neurologic examinations for facial nerve damage in surgically treated mandibular collum fractures].

Transcranial magnetic stimulation is a new method for objective evaluation of the facial nerve without constraints for the patient. By the first time, especially cortical lesions can be detected objectively. Using this method, a permanent disturbance of the ramus marginalis mandibularis after operative treatment of fractures of the mandibular condyle could be certainly excluded. Therefore, because of the clear presentation and the possibility of enlargement, the deep submandibular approach, using a correct operative technique, can be strictly recommended.

Electromagnetic Fields↗

[Equipment and transducer-independent 3D ultrasound in the maxillofacial area].

AIM: The use of a new 3D ultrasound system should reduce the drawbacks of former 3D workstations (long image generation time, limited use due to the need for special 3D transducers), so that it is now applicable in daily clinical routine. METHOD: An ultrasound 3D workstation was used based on a pentium PC platform, employing a magnetoelectronic position detection system for spatial reconstruction of conventional 2D B-scan image sequences. RESULTS: Better assessment of topographico-anatomical spatial relationships was achieved when presenting pathological findings, especially in assessing lymph nodes and salivary stones. Pathological processes in the maxillofacial area occurring during a period of five months were visualised. CONCLUSION: The method of 3D reconstruction of standard two-dimensional electronic scans, as presented here, is the first method of its kind enabling applicability in daily clinical routine thanks to rapid imaging. The images can be produced with any ultrasound unit or transducer. First clinical results in maxillofacial surgery clearly show improved diagnostic possibilities although there still room for an improvement of the image quality. The possibility of semi-automatic exact volumetry appears meaningful especially in the investigation of lymph nodes. Integration of colour duplex sonography will further enhance the diagnostic value of this method.

Humans↗

[Videocinematography and pre- and postoperative diagnosis of lip-maxillary-palatal clefts].

Videocinematography is a valuable tool in the diagnostic workup and planning of functional surgery in cleft patients. The high resolution and depiction of the finest mucosal structures in motion allow objective and dynamic assessment of the individual velopharyngeal function. A total of 170 cleft patients were examined by videocinematography, and the results were compared to nasoendoscopy and to the clinical examination. The marked superiority of this radiological technique with regard to clearness of depiction and ease of use is shown. It can therefore be recommended without reservation for the pre- and postoperative assessment of cleft patients.

Adolescent↗