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Biomedical subjects

N Frisch

Publications and source records attributed to N Frisch.

At least 19 recordsLinked to original sources
PubMed1994

[Computer-assisted provocation and detection of optokinetic nystagmus].

A computer-controlled system for the automatic induction, registration, and analysis of optokinetic nystagmus is presented. On a high-resolution computer video monitor, a horizontally moving pattern of vertical stripes of equal size and distance is displayed. Stimulus size, velocity, and direction of movement are computer-controlled and variable. Exposure to this display induces horizontal optokinetic nystagmus in the patient. The patient's eye movements are registered by an infrared non-contact limbus-tracker system and transferred to the computer in a digitized format. With a specifically developed computer program the pursuit eye movements are detected and analyzed for amplitude, duration, and velocity and may be displayed on a second monitor. Simultaneously, the congruence of the direction of the stimulus and of the direction of the eye movement are automatically supervised and quantified by an "acceptance coefficient." The first clinical studies with healthy experimentees showed that for each stimulus size a certain stimulus velocity exists that provides maximal nystagmus provocation. Smaller stimulus sizes require slower stimulus velocities. Future developments of the system will allow applications in other fields of nystagmus research and in the accessment of objective visual acuity.

Electronystagmography↗
PubMed1992

Aneurysms of the extracranial internal carotid artery due to fibromuscular dysplasia: results of surgical management.

Between January 1977 and December 1990, eight patients underwent surgical correction of aneurysms of the extracranial internal carotid artery due to fibromuscular dysplasia. Mean age of patients was 50 years (range 31 to 70 years). Five patients presented with neurologic hemispheric symptoms. Most aneurysms were saccular and occurred preferentially at the level of C2 or C3. All of these patients underwent operation through conventional cervicotomy. Resection-anastomosis was performed in three cases whereas resection-graft was performed in five. Histopathological examination of the eight specimens was consistent with fibromuscular dysplasia of the media. There was no central nervous system-related mortality and morbidity. Seven patients were alive and free of new neurological manifestations at mean follow-up of 156 months (18 to 180 months). One patient died of myocardial infarction at 96 months. All patients had postoperative duplex scanning or arteriograms. These revealed that carotid restorations were patent in seven whereas one patient had asymptomatic occlusion at 18 months.

Adult↗
PubMed1991

Long-term results of thrombectomy for late occlusions of aortofemoral bypass.

Sixty-two first episodes of aortofemoral (eight patients) or aortobifemoral (42 patients) bypass thrombosis were operated upon in 50 patients between 1980 and 1985. There were 47 men and three women whose mean age was 58 years. Retrograde thrombectomy through the distal anastomosis was achieved in all cases by using either a balloon catheter or Vollmar rings. If thrombectomy was impossible, revascularization was ensured by an extraanatomic bypass or complete replacement of the graft. Angioplasty, repeat distal anastomosis or femoropopliteal bypass of the native runoff artery were done in 55 (89%) operations. The cause of thrombosis was elucidated in 45 cases. Suture line stenosis and atheromatous stenosis of the native runoff artery were the two most common causes. Three patients died and two required above-knee amputation in the immediate postoperative period. Contralateral embolism occurred in two patients undergoing retrograde thrombectomy. Mean follow-up was 47 months. Thrombectomy was possible in 51 or 62 prosthetic thromboses (Group I). Thirty-nine of these grafts have remained patent. Twelve instances of repeat thrombosis occurred, requiring either repeat thrombectomy or a new bypass. Primary patency in group I was 97.8%, 81.2%, and 71.3% at one, three, and five years, respectively. Thrombectomy was impossible in 11 graft thromboses (Group II). A new bypass was performed in all 11 cases. Primary patency in Group II was 100%, 75% and 50% at one, three, and five years, respectively. Retrograde thrombectomy combined with treatment of native runoff artery anomalies can restore long-term patency when thrombosis occurs late after aortofemoral bypass and is associated with low mortality and morbidity.

Adult↗
PubMed1991

Persistent proatlantal artery associated with carotid artery stenosis treatment by percutaneous transluminal balloon angioplasty.

A 58-year-old man had an asymptomatic tight stenosis of the internal carotid artery associated with a persistent proatlantal artery. This as well as other compositional arterial anomalies of the basilar artery were discovered on arteriograms. The stenosis was successfully treated by percutaneous transluminal balloon angioplasty. Therapeutic choices are discussed in this setting because of the risk of carotid clamping in the presence of persistent carotid-basilar anastomoses.

Angioplasty, Balloon↗
PubMed1989

[Thrombectomy or thrombolysis in the treatment of proximal phlebitis. Functional long term results].

MATERIALS AND METHODS Between 1981 and 1985, 78 iliocaval thrombi were treated by aggressive therapy: 52 surgical thrombectomies were performed by a femoral approach associated, depending on the case, with a caval approach; and 26 iliofemoral thrombi were lysed according to a protocol in which urokinase and plasminogen were used over a 48-h period. Subsequent functional evaluation was based on clinical scoring (0 to 9 points) taking into account functional impairment, edema and trophic disorders. Patency of trunks and the deep valvular state were assessed by Doppler examination and plethysmography. RESULTS In the surgical group, 3 early deaths occurred, only one of which could be attributed to an embolic course. Six weeks after surgery the rate of recurrence of iliac thrombosis was 50% (25% postoperative + 25% secondary). Beyond this period, there were no recurrences of thrombosis. There was a direct, statistically significant relation between the degree of iliac patency and the realization of an ideal thrombectomy on a nonadherent fresh clot. The functional results, assessed after four and a half years of follow-up, are satisfactory (score less than 3) in 80% of patients. The poor results with venous claudication or varicose ulcer all occurred in the case of massive persistent thrombi of the femoral confluence. Valve lesions were signaled in 46% of patients by a massive backflow in orthostatism. In the medical group, a major hemorrhagic complication occurred under urokinase therapy in 11% of patients, including one for whom it was fatal. Sixty percent of patients showed immediate radiological improvement allowing partial or total freeing of a venous confluence. The functional results after 4 years of follow-up were nondisabling in 85% of patients. No leg ulcers were detected. Late iliac patency was low (26%), whereas at the femoral level almost all of the thrombi which remained after lysis became patent again spontaneously. Valve failure was found in 37% of patients. Both groups had very similar late functional results despite rather different anatomical conditions. The iliac patency rate was higher in the surgical group (50% vs 26%), but plethysmographic study showed that in case of therapeutic failure devalvulation was greater after surgery (46% vs 37%).

Femoral Vein↗
PubMedDate not supplied

Noncognitive factors that put students at academic risk in nursing programs.

A random sample of 112 baccalaureate nursing students were surveyed. The relationship of noncognitive variables to student academic success was identified. Findings suggest that 1) students who do not understand how to negotiate the system, or students who feel they will not "fit in" may have difficulty, 2) male students are more likely to need support for their academic plans, and 3) minority students may need support to establish community ties.

Adaptation, Psychological↗
PubMedDate not supplied

Making research readable.

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Attitude of Health Personnel↗
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On nurturing nurses.

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Interprofessional Relations↗
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A trifocal model of nursing diagnosis: wellness reinforced.

As nurses have identified the phenomena of concern to nursing and developed diagnostic language, there has been a persistent omission of diagnostic labels that reflect health and a wellness orientation. The fact that the term "diagnosis" has been identified with problems and deficits has impeded work on wellness diagnoses. Further, lack of consensus regarding a definition of health further complicates work in this area. The authors propose a model that incorporates a category of "opportunity to enhance," in addition to the categories of "problem" and "high risk" to derive a trifocal model of nursing diagnoses. Examples from nursing practice are given.

Health↗
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Nursing Diagnosis↗