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At least 163 records · Page 9Linked to original sources

PubMed2001

Introducing navigated transcranial magnetic stimulation as a refined brain mapping methodology.

A major intrinsic limitation of transcranial magnetic stimulation (TMS) to map the human brain lies in the unclear relationship between the position of the stimulating coil on the scalp and the underlying stimulated cortex. The relationship between structure and function as the major feature constituting a brain mapping modality can therefore not be established. Recent advances in image processing allowed us to refine TMS by combining magnetic resonance imaging (MRI) modalities with TMS using a neuronavigation system to measure the position of the stimulating coil and map this position onto a MRI data set. This technique has several advantages over recent TMS mapping strategies. The position of the coil on the scalp can be held constant as verified by real time visual guidance. When evaluating higher cortical functions, the relationship between underlying cortical anatomy and the scalp stimulation site can be accurately assessed. Cortical motor output maps can be easily obtained for preoperative planning and decision making for mass lesions near rolandic cortex in patients. In conclusion, navigated TMS is a reliable alternative for localizing cortical functions and therefore may be a useful adjunct or in selected patients even a helpful alternative to other functional neuroimaging methods.

Brain↗

PubMed2006

[Application of diffusion tensor imaging fractography in minimally invasive surgery of brain tumors].

OBJECTIVE: To investigate the effects and prospect of application of diffusion tensor imaging (DTI) fractography in minimally invasive surgery of brain tumors. METHODS: DTI fractography was performed in 52 patients with malignant brain tumors. Based on the DTI fractography results, 34 of the 52 patients underwent operation under neuro-navigation, and 18 of the 52 patients underwent operation routine minimally invasive craniotomy and tumor resection without neuro-navigation. RESULTS: The rate of total tumor resection was 86.5% (45/52). The mortality was 1.9% (1/52). The disability rate was 11.5% (6/52). No case needed the second operation. CONCLUSION: DTI fractography has raised the minimally invasive neurosurgery to the level of protecting the nuclei and nerve tracts and guiding intra-operative management of infiltration of deep-seated tumors, especially when combined with neuro-navigation and interventional MRI.

Adolescent↗

PubMed1999

Accurate pedicle screw insertion under the control of a computer-assisted image guiding system: laboratory test and clinical study.

We used a commercially available computer-assisted navigation system (StealthStation; Sofamor Danek, Memphis, TN, USA) in both an in-vitro and a clinical study performed in 1996-1998. The basic data used for navigation were preoperative computed tomography (CT) scan imaging data. The position of the probe or drill guide was superimposed in real-time on a monitor. For the in-vitro study, ten plastic lumbar spine models (50 vertebrae) were used. The entrance hole for the screw was made by drilling, following navigation. Using the navigation system, we drilled 88 holes through the pedicles into the vertebral bodies of 44 vertebral models. All 88 pedicle holes were contained within the pedicle without perforation. The mean deviation of the hole positions from the surgical plan was 1.78 +/- 0.81 mm, and the mean angular deviation was 2.28 degrees +/- 1.92 degrees. In 29 patients, using the navigation system, we introduced 169 pedicle screws at the planned position. Fifty-one screws were used for thoracic and 118 screws for lumbar spinal fixation. All screws correctly passed through the pedicles. There were no neurological complications after surgery. Using this guided surgery system, we achieved satisfactory results both in the laboratory and in a clinical setting.

Adolescent↗

PubMed2003

Image-guided transsphenoidal surgery for pituitary lesions using Mehrkoordinaten Manipulator (MKM) navigation system.

Twenty-five patients with pituitary lesions were operated on by image-guided transsphenoidal surgery (TSS) using the Mehrkoordinaten Manipulator (MKM) navigation system. The cases included 21 cases of pituitary adenomas, 2 cases of craniopharyngioma and 2 cases of Rathke's cleft cyst. All operations were performed through the sublabial approach under an operative microscope. In some cases, an endoscope was used for the observation of the residual tumor and surrounding structures. The tumors and surrounding important structures such as the internal carotid arteries, the basilar artery, and the optic nerves were precisely localized, and mechanical error was less than 2 mm in almost all cases. In 3 early cases of pituitary adenoma, the patient's head was moved slightly during the insertion of the nasal speculum; in these cases, the resulting error was more than 2 mm. In evaluating the procedures, we determined that the most useful benefit of the MKM system compared with other systems is that the navigation information is not only displayed on the monitor, but also presented in the operative field under the microscope. Therefore, the surgeon can obtain the navigation information without removing his eyes from the operative field under the microscope. The most important drawback to the system is its bulky size.

Adenoma↗

PubMed1992

Black American folk medicine health care beliefs: implication for nursing plans of care.

Even in this age of information, some African Americans equate good health with luck or success. An illness or disease, viewed as undesirable, may be equated with bad luck, chance, fate, poverty, domestic turmoil, or unemployment, and in such case, Black Americans will consult a physician only after attempts with home remedies have failed. It is important for the nurse when working with Black patients, remember that when this patient enters the traditional bio-medical health care delivery system, it is best to assume that all known and available cultural home remedies have been tried. According to Bloch (1976), some Black Americans believe that the nurse should recognize cultural medical practices and the western medical remedies based on these beliefs. It is essential that the nurse determine whether these home remedies will interact or interfere with orthodox medical approaches. If home remedies are found to be efficacious or neutral. they may be kept at the patient's bedside. However, if they are found to be harmful, the nurse should assist the patient in developing an understanding about the remedies' dangers. With an emphasis on education, the patient can be navigated toward modern medical preventive techniques and cures, and the nurse may observe and judge the variety and efficacy of age-old culturally entrenched health care practices. Future studies may just substantiate the science behind the folklore.

Black or African American↗

PubMed2006

[Clinical contrast of cervical pedicle screw fixation assisted by C-arm fluoroscopy or 3D navigation system].

OBJECTIVE: To evaluate the feasibility and accuracy of cervical (C(2)-C(7)) pedicle screw fixation assisted by C-arm fluoroscopy or 3D navigation system (CT-based navigation system or Iso-C 3D navigation system). METHODS: One hundred and forty-five cervical pedicle screws inserted with C-arm fluoroscopy and 187 pedicle screws inserted with 3D navigation system were observed by postoperative CT or Iso-C 3D scan. The process of navigation was investigated. RESULTS: In the 145 screws inserted with C-arm fluoroscopy, 133 screws are accurate (91.7%), and in the 187 screws inserted by 3D navigation system, 183 screws are accurate (97.9%) (chi2 = 6.705, P = 0.010), and the 4 misplaced screws occurred in the early stage of navigation system application. The process of navigation was investigated in twenty-five patients. With CT-based navigation, the mean time for registration and surface matching was 3.5 minutes; with Iso-C 3D navigation, the mean time for images collection and transfer was 6.2 minutes. The mean time for screw-marker insertion was 2 minutes. CONCLUSIONS: 3D navigation system can increase accuracy of cervical pedicle screw fixation obviously.

Adult↗

PubMed2005

Leg axis after computer-navigated total knee arthroplasty: a prospective randomized trial comparing computer-navigated and manual implantation.

To compare the alignment after computer-navigated total knee arthroplasty, 52 patients were randomly allocated to 2 groups. Twenty-seven patients received a total knee arthroplasty with the aid of a kinematic computer-navigation system, and 25 patients received a total knee arthroplasty with the conventional method. Both groups were well balanced concerning demographic data and preoperative scores. At 3-month follow-up, the mechanical alignment of the leg reached the desired straight axis in more cases with the computer-navigated implantation. This difference was statistically significant. The femoral and tibial mechanical anteroposterior axis and the femoral and tibial sagittal tilt (slope) measured on sagittal x-rays were not significantly improved in this patient group.

Aged↗

PubMed1997

Image guided microsurgery with a semifreehand neuronavigational device.

There is only limited experience with neuronavigators among the neurosurgical community so far. We evaluated such a prototype system in order to define indications for its succinct future use and to adjust it to daily clinical practice. We have employed an infrared light-linked computerized system (SPOCS; Aesculap/ISG) for preoperative planning and intraoperative navigation according to digitized images. A wired, penlike sensor-located "pointer" is used for navigation. Forty-eight patients (22 females, 26 males; aged 7-74 years) with a total of 53 intracranial lesions are included in the study. Fourteen lesions were smaller than 2 cm (26.4%), 33 were 2-4 cm (62.3%), and 6 were greater than 4 cm (11.3%). The documented accuracy was in the range of 3 mm or better in 33 patients throughout the whole operation and in an additional 7 through the most important surgical steps, with satisfactory results in all types of patient positioning except for the sitting position. In one patient the accuracy level decreased too early to perform useful intraoperative navigation. Technical dropouts early in the series led to abortion of the navigation in 7 instances but would currently no longer lead to abortion. There was no additional surgical morbidity associated with the use of the system. With more convenience in instrument design and development of techniques for real-time intraoperative reregistration, this kind of navigational device will play an increasingly important role for assistance during intracranial surgery. It proved to be helpful for planning of the craniotomy, intraoperative guidance on occasions of limited exposure and narrow visual field, localization and resection of small lesions in critical areas, and border definition of large lesions and for pure image guided resection of previously marked regions.

Adolescent↗

PubMed2002

Accuracy of 3-d needle navigation in interstitial brachytherapy in various body regions.

BACKGROUND: Precise immobilisation of a patient during extracranial stereotactic 3-D navigation is essential in order to minimize the patient's movement during CT data recording and needle application. In this paper we report the first results of needle positioning accuracy in various body regions, using a 3-D navigation system for brachytherapy and a new patient immobilisation system. PATIENTS AND METHODS: Six patients with different manifestations of neoplastic diseases were immobilized by a special vacuum system and treated with stereotactic 3-D navigational interstitial brachytherapy. RESULTS: The comparison of the simulated stereotactic needle positions with the actual needle positions resulted in a mean positioning deviation varying from 3.4 to 6.5 mm for 29 needles. The maximum positioning deviation lay between 5.7 and 13 mm. CONCLUSION: The results of our study show that, despite effective patient immobilisation, an increase in needle positioning accuracy is limited by the method of stereotactic 3-D navigation. Effects such as modification of body shape caused by the needle application morphologic alterations, and inherent inaccuracies within the navigation system have an important influence upon accuracy, which it is not yet possible to calculate.

Brachytherapy↗

PubMed2006

Image-guided periacetabular osteotomy: computer-assisted navigation compared with the conventional technique: a randomized study of 36 patients followed for 2 years.

BACKGROUND: Periacetabular osteotomy (PAO) is an effective but technically demanding surgical procedure. We evaluated the efficiency of computer-assisted navigation in PAO and compared it with the traditional approach. PATIENTS AND METHODS: We performed a randomized study of 36 patients undergoing PAO using either the CT-based, computer-assisted navigation technique or the conventional approach. The operative details, radiographic results, and functional outcomes were compared between groups. RESULTS: Patients in the conventional surgery group required an average of 4.4 (2-7) images of intraoperative radiographs, whereas only 0.6 (0-1) images were required in the navigation group. The operation time was 21 min shorter with computer-assisted navigation. No significant difference with regard to operative blood loss, transfusion requirement, correction of deformity, and functional improvement was found. Complications such as intraarticular damage, osteonecrosis, or neurovascular injury were not encountered. INTERPRETATION: A computer-assisted navigation system is a feasible tool to provide real-time image guidance and facilitate PAO. However, it offers little additional benefit when the surgery is done by an experienced surgeon.

Acetabulum↗

PubMed2006

The decision-making experience among women diagnosed with stage I and II breast cancer.

A cancer diagnosis signals entry for many patients into the complex and often bewildering world of cancer care. Understanding the role women prefer and their level of satisfaction with the decision-making process at time of diagnosis will help to inform healthcare professionals how to better support breast cancer patients as they navigate the cancer journey. Logistic regression was used to identify significant factors influencing outcomes in role preferences and satisfaction. A complementary method, principal components analysis was used to explore patterns of co-association between outcomes and their influencing factors. Results showed women tended to adopt cancer decision-making roles similar to those used for general health decision-making. Overall, women preferred a collaborative/active role (40/38%) over a passive role (16%). Satisfaction rates were high with 88.1% of women being satisfied/very satisfied with their cancer treatment choice; 89.7% of women satisfied with their decision-making role and; 83.6% satisfied with the information provided to support their decision. Further research involving cohorts of women diagnosed with more advanced disease and for whom decisional regret may be greater, is needed to further explore the link between preferred decision-making role and satisfaction.

Adult↗

PubMed2004

Fast, three-dimensional free-breathing MR imaging of myocardial infarction: a feasibility study.

Imaging delayed hyperenhancement of myocardial infarction is most commonly performed using an inversion recovery (IR) prepared 2D breathhold segmented k-space gradient echo (FGRE) sequence. Since only one slice is acquired per breathhold in this technique, 12-16 successive breathholds are required for complete anatomical coverage of the heart. This prolongs the overall scan time and may be exhausting for patients. A navigator-echo gated, free-breathing, 3D FGRE sequence is proposed that can be used to acquire a single slab covering the entire heart with high spatial resolution. The use of a new variable sampling in time (VAST) acquisition scheme enables the entire 3D volume to be acquired in 1.5-2 min, minimizing artifacts from bulk motion and diaphragmatic drift and contrast variations due to contrast media washout.

Feasibility Studies↗

PubMed1999

[Clinical value of magnetic resonance tomography in imaging coronary stenoses. A comparison with coronary angiography and myocardial scintigraphy].

BACKGROUND AND OBJECTIVE: The development of ultra-rapid gradient-echo sequence magnetic resonance imaging (MRI) makes it possible to visualize coronary arteries. But the clinical value of coronary artery MRI (MRCA) still needs to be established. It was the aim of this study to determine whether MRCA can demonstrate proximal parts of the coronary arteries and visualize haemodynamically relevant stenoses. PATIENTS AND METHODS: MRCA was performed, using segmented 2D sequences and a navigator pulse, in 29 patients (22 men, seven women, mean age 60 +/- 10 years) in whom coronary heart disease (CHD) was suspected or who, with proven CHD (> or = 50% stenosis) further treatment was to be established. Exercise myocardial scintigraphy with single proton emission tomography (SPECT) was additionally performed in 20 of the patients. RESULTS: Seven of 87 coronary arteries (8%) could not be demonstrated because the patients' claustrophobia necessitated premature termination of the investigation: these vessels were excluded from the final analysis. The mean length of the visualized coronary arteries was 12 +/- 4 mm for the main stem (LM), 36 +/- 14 mm for the left interventricular branch (LAD), 18 +/- 12 mm for the circumflex branch (CX) and 67 +/- 23 mm for the right coronary artery (RCA). Of 37 stenoses demonstrated by coronary angiography 29 were also visualized by MRCA: 13 of 18 LAD stenoses, two of three CX stenoses and 14 of 16 RCA stenoses. Mean sensitivity of MRCA was 78%, mean specificity 86%. In patients who had undergone exercise SPECT, coronary angiography demonstrated 26 stenoses, of which 16 (six LAD, two CX and eight RCA stenoses) were haemodynamically significant. Of these 16 stenoses MRCA demonstrated 13, but three stenoses (one RCA and two LAD stenoses) were not visualized, because the stenoses were distal to the demonstrated segments. CONCLUSION: MRCA can visualize moderately severe stenoses, especially of the proximal coronary arterial segments. This method represents an new approach to noninvasive diagnosis of CHD, but additional technical improvements will have to be made.

Adult↗

PubMed1989

Levels of adaptation and narcissistic psychopathology.

Why, one might reasonably query, do some narcissistic characters serve time as seemingly successful presidents of corporations while others serve time as seemingly impaired inpatients on psychiatric units? I will offer some observations on this unusual clinical phenomenon and suggest that it is useful to distinguish between two clinical presentations of narcissistic character psychopathology, which I will call, for the sake of expedience, Level 1 and Level 2. I will then examine 1) how an understanding of the dimensions of empathic abilities, paranoia, levels of depression, grandiosity, and defensive uses of denial and disavowal can lend a broad explanatory range to the understanding of these levels, and 2) how we can assess both successful and unsuccessful adaptation to the outer world and the inner world in narcissistic disorders. Moreover, it is important to distinguish between being well adapted and being emotionally healthy, which are quite different in meaning and intent. I use the term Level 1 to refer to the more poorly adapted presentation, and the term Level 2 to refer to the more successfully adapted narcissistic presentation. Characteristics of Level 1 narcissistic pathology dispose a patient to an adaptation that is similar to the description of the narcissistic patient who is often described as borderline; characteristics of Level 2 narcissistic pathology dispose a patient to a high-flying and superficially successful adaptation in which the patient can competently navigate the occupational and social demands of an external world despite the presence of severe object relational impairments. While a difference in adaptation is highlighted, emotional well-being is not within the exclusive province of either's characteristic adaptive skills.

Adaptation, Psychological↗

PubMed2006

A practical physicians' guide to the Medicare drug benefit plan.

Recent commentaries on Medicare Part D highlight both the early failings and the successes of the program. However, regardless of one's opinions about the program, Part D is a reality that millions of Medicare beneficiaries must address now and in the future. The ultimate economic, policy, and clinical success of the Medicare drug benefit plan depends on its transparency and ability to be navigated together by patients, physicians, and other parties. Although Medicare Part D is likely to evolve considerably in the future, it will continue to present elderly adults with numerous plan options and rules and therefore present persistent challenges for patients and physicians. By focusing on a few crucial aspects of Part D and taking advantage of available resources, physicians can simplify Part D for their patients, help them make informed decisions about enrollment and plan selection, and possibly help them save money with their current PDP. This may, in turn, reduce beneficiaries' out-of-pocket prescription costs, thereby improving patients' access to medications and possibly their medication adherence and health outcomes as well.

Decision Making↗

PubMed2001

Comparison of intraoperative MR imaging and 3D-navigated ultrasonography in the detection and resection control of lesions.

OBJECT: The authors undertook a study to compare two intraoperative imaging modalities, low-field magnetic resonance (MR) imaging and a prototype of a three-dimensional (3D)-navigated ultrasonography in terms of imaging quality in lesion detection and intraoperative resection control. METHODS: Low-field MR imaging was used for intraoperative resection control and update of navigational data in 101 patients with supratentorial gliomas. Thirty-five patients with different lesions underwent surgery in which the prototype of a 3D-navigated ultrasonography system was used. A prospective comparative study of both intraoperative imaging modalities was initiated with the first seven cases presented here. In 35 patients (70%) in whom ultrasonography was performed, accurate tumor delineation was demonstrated prior to tumor resection. In the remaining 30% comparison of preoperative MR imaging data and ultrasonography data allowed sufficient anatomical localization to be achieved. Detection of metastases and high-grade gliomas and intraoperative delineation of tumor remnants were comparable between both imaging modalities. In one case of a low-grade glioma better visibility was achieved with ultrasonography. However, intraoperative findings after resection were still difficult to interpret with ultrasonography alone most likely due to the beginning of a learning curve. CONCLUSIONS: Based on these preliminary results, intraoperative MR imaging remains superior to intraoperative ultrasonography in terms of resection control in glioma surgery. Nevertheless, the different features (different planes of slices, any-plane slicing, and creation of a 3D volume and matching of images) of this new ultrasonography system make this tool a very attractive alternative. The intended study of both imaging modalities will hopefully allow a comparison regarding sensitivity and specificity of intraoperative tumor remnant detection, as well as cost effectiveness.

Brain Neoplasms↗

PubMed2005

Multimodal protocol for awake craniotomy in language cortex tumour surgery.

BACKGROUND: Intra-operative neurophysiological language mapping has become an established procedure in patients operated on for tumours in the area of the language cortex. Awake cranial surgery has specific risks and patients are exposed to an increased physical and mental stress. The aim of the study was to establish an algorithm that enables tailoring the neurosurgical and anaesthetic techniques to the individual patient. METHOD: A total of 25 patients underwent awake craniotomy for intra-operative language mapping between 1999 and 2004. Following craniotomy under analgesia and sedation without rigid pin fixation of the head, cortical language mapping was performed in the fully co-operative patient. The results of functional magnetic resonance imaging and of cortical language mapping were incorporated into the 3D dataset for neuronavigation. Depending on the functional data and the individual operative risk tumour resection then proceeded either under conscious sedation with the option of subcortical language monitoring or under general anaesthesia. FINDINGS: After cortical language mapping patients are assigned to one of four groups: BACC (Berlin awake craniotomy criteria) I-IV. BACC I (9 patients): adequate functional data+operative risk not increased-->tumour resection in the awake patient; BACC II (4 patients): limited functional data+operative risk not increased-->tumour resection in the awake patient with the option of language monitoring as needed; BACC III (9 patients): adequate functional data+increased operative risk-->tumour resection under general anaesthesia using functional navigation; BACC IV (3 patients): limited functional data+increased operative risk-->tumour resection in the awake patient with the option of language monitoring as needed. We observed less adverse events in group BACC III. No permanent deterioration of language function occurred in this series. CONCLUSIONS: The multimodal protocol for awake craniotomy provides for tumour resection under general anaesthesia in selected patients using functional neuronavigation. Our experience with the algorithm suggests that it is a useful tool for preserving function in patients undergoing surgery of the language cortex while reducing the operative risk on an individual basis.

Adult↗

PubMed2005

Functional impact of navigation-assisted minimally invasive total knee arthroplasty.

The functional results of 47 navigation-assisted minimally invasive total knee arthroplasties (TKAs) were compared with results of 50 conventionally performed TKAs with a minimum 1-year follow-up. Navigation-assisted minimally invasiveTKA showed better functional results than conventionally performed TKA at 1 year after surgery with regard to the Hospital for Special Surgery (HSS) score, Western Ontario and McMaster Universities (WOMAC) pain and function score, flexion range, and less outliers of leg and component alignment. Among the bilateral cases (one side by navigation-assisted minimally invasive TKA and the other side by conventionally performed TKA), more patients preferred the navigation-assisted minimally invasive side to the conventionally performed side.

Arthroplasty, Replacement, Knee↗