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At least 541 records · Page 30Linked to original sources
PubMed2006

[25G transconjunctival vitrectomy for epiretinal membranes and vitreo-macular traction syndromes: results after 6 months].

PURPOSE: to evaluate the safety and efficacy of the 25G transconjunctival vitrectomy in the treatment of epimacular membranes and vitreo-macular traction syndromes. METHODS: in this prospective study dealing with a consecutive series of 38 eyes with an epimacular membrane or a vitreo-macular traction syndrome, we recorded mainly the visual acuity the day before surgery, at day 1, 8 and 6 months after surgery, duration of surgery, and complications peroperatively, at day 1, 8, and at 6 months. RESULTS: 23 eyes had a 6-month follow-up (60%). Mean preoperative, day 1, day 8 and 6-month distance visual acuities were 0.3, 0.2, 0.4 and 0.5, respectively. Mean preoperative and 6-month near visual acuities were P4 and P3, respectively. At day 1 and day 8, 14/38 eyes (31%) and 33/37 eyes (89%), respectively, had a distance visual acuity equal or superior to the preoperative visual acuity. At 6 months, 16/23 eyes (70%) had a distance visual acuity improvement of at least 2 lines. 13/23 eyes (57%) had a near visual acuity improvement of at least 2 levels. Mean duration of surgery was 19 minutes (7 - 40'). Short-term complications were very few, and none were encountered afterwards. CONCLUSION: the 25G transconjunctival vitrectomy is a safe, effective, and convenient technique in the treatment of epimacular membranes and vitreomacular traction syndromes.

Adult↗
PubMed1990

[Study of traction and effect of bonding agents on etched porcelain].

Nowadays many authors suggest the use of porcelain laminate veneer that has come to play an important role in the solution of many esthetic and functional problems. At the moment, it is the alternative treatment to solve some cases with the least dental reduction, the highest fitting and a low cost. To evaluate the tractional resistance done on the porcelain veneer, in which acid etching and connecting agents were applied, I suggest: 1. The resistance of traction carried out on etched porcelain laminate to which an agent of silane join and a resin of connection were applied, was the one that had the best conduct. 2. The tractional resistance carried out on the laminate fronts where a treatment of only silane and resin of connection was applied, was greater where the treatment of silane was employed. 3. The etched with acid both in the adamantine surface and in that of well depurated porcelain, is an important factor to obtain a good retention.

Acid Etching, Dental↗
PubMed1990

Treatment of Class II, division 1, cases with a maxillary traction splint.

Class II, division 1 cases are treated by many different techniques depending on the age of the patient and cause of the malocclusion. To overcome the undesirable effects of headgear on anchor teeth, a removable appliance, the maxillary traction splint, is used with extraoral forces. In this study, 15 patients with maxillary dentoalveolar protrusions and Class II, division 1, malocclusions were treated with a maxillary traction splint. Cephalograms taken before and after treatment and the sagittal skeletal and dental changes were evaluated and quantified. The results showed that use of the maxillary traction splint prior to fixed appliance therapy is effective in correcting dentoalveolar protrusion in growing patients.

Cephalometry↗
PubMed1989

Tangential-radial traction suturing technique for intrascleral foreign material implantation.

We used an intrascleral implantation technique to anchor a keratoprosthesis in the limbal sclera of 22 rabbits' eyes. The tangential-radial traction used in this procedure enabled multivectorial traction forces to be applied while maintaining a tight junction between the biological tissue and the foreign material. During 29 weeks of follow-up there was no postoperative leakage, no cataracts developed, and the anterior chamber was maintained in all the eyes at all times. No ocular infection developed in any eye during the first postoperative month. The compound-force traction used in this procedure may prove useful in other areas of ocular surgery.

Animals↗
PubMed1989

[Experimental study of the efficacy of endodontic instruments in pure traction].

A method to test the efficiency of traction is developed on bovine bones, according to a mechanical mode. This procedure concern specific dynamics of the M.M.E. as well as the traction components of M.M.C. Profilometric measurement of the volume of material removed with each instrument for a specific number of turns, reflects its cutting efficiency in traction. Lubrification always increases the instruments' cutting power, whether it is provided by water or sodium hypochlorite solution. Loss of the efficiency of an M.M.E. instrument, used clinically, has been estimated at approximately 50%.

Animals↗
PubMed1978

Telogen effluvium: a clinically useful concept, with traction alopecia as an example.

Telogen effluvium is the excessive loss of normal club hairs. It can be diagnosed simply by microscopic examination of the hairs that are being shed. These hairs have uniform shaft diameter and normally shaped bulbs that contain no pigment. The causes of telogen effluvium are well known and easily distinguishable. They include parturition, febrile illness, surgical operations and anesthesia, anticoagulant drugs, psychi stress, crash diets, and traction. Traction alopecia often produces recognizable patterns of hair loss and can be diagnosed in many cases with reasonable certainty. It is usually not accompanied by inflammatory changes and the prognosis is excellent provided the causative styling practices-braids, rollers, ponytails, etc-are discontinued. Telogen conversion may be caused by interference with papillary blood flow. Since traction alopecia would seem to be reproducible, it may serve as a model for the study of telogen conversion.

Alopecia↗
PubMed1995

[The effect of indomethacin suppository in preventing mesenteric traction syndrome].

Mesenteric traction syndrome consists of cutaneous hyperemia with hypotension and tachycardia. NSAIDs could inhibit the phenomenon, but there are few reports about when to administer these drugs. In this study, we evaluated the effect of indomethacin on preventing mesenteric traction syndrome when administered preoperatively and just after induction of anesthesia. Thirty-six patients scheduled for abdominal hysterectomy were studied. Patients were randomized into three groups. Group C (n = 12); control, group T (n = 12); indomethacin 50 mg suppository just after induction of anesthesia, group P (n = 12); indomethacin 50 mg suppository about 90 min before incision. The effect of indomethacin was evaluated from the extent of cutaneous hyperemia. MTS was suppressed in group P, but not in group T (P < 0.05). We concluded that indomethacin suppository just after induction could not prevent mesenteric traction syndrome.

Adult↗
PubMed1994

[Study on development of linear-traction type skeletal muscle powered pump].

We successfully developed Linear-Traction Type Skeletal Muscle Powered Pump (LSMPP). Unlike the Insertion-Type SMPP (ISMPP), previously used by us, in which a polyurethane chamber is inserted between skeletal muscle and chest wall, this pump can utilize the traction of muscle fiber in a linear direction. This pump also enabled us to obtain a sufficient flow with a low preload by the use of a spring for the filling of the pump. Comparison was made between the measurement of flow using the origin side of Latissimus Dorsi Muscle (o-group) (n = 6) and that using the upper arm side (i-group) (n = 6), both measured with the Linear-Traction Type equipment, and the result obtained with the ISMPP (s-group) (n = 6). Under a rate of 60 beat/min and a preload of 40 mmHg, the flows (ml/min) of o-group, i-group and s-group were 668.0 +/- 108.0, 1202 +/- 478.6 and 620.0 +/- 188.0, respectively. In i-group (n = 6), different rate, preload and spring constant were given to examine how the flow would vary with them. Mean flow (Mean +/- Std ml/min) was 815.0 +/- 378.0 at 60 beat/min, significantly different in comparison with that of 80 beat/min and that of 100 beat/min. For 40, 30 and 20 mmHg of preloads, mean flows were 877.0 +/- 366.0, 625.0 +/- 311.0 and 422.0 +/- 270.0, respectively. This showed that, as far as the rate remains low, even low preload can provide some 30% of the cardiac output of a dog as compensate cardiac flow. In contrast, there were no significant differences in mean flow with spring constants such as 0, 80, 160, 240 and 320 g/cm.

Animals↗
PubMed1977

[On the therapy of tractional retinal detachment without hole formation (author's transl)].

The authors describe 6 cases of tractional retinal detachment without hole formation--five as a result of intraocular metal splinter injuries and the sixth after scleral perforation following windshield injury which was overlooked. Splinter extraction was performed twice through the perforation and three times though the pars plana from the ouside. The time between the injury and appearance of the retinal detachment varied between four months and nine years. In every case there was a diffuse falt detachment without obvious tent formation. Reattachment was successful in five cases by release of the traction from the outside by cerclage with folding of the point of traction in the vitreous body and diathermy with drainage of the subretinal effusion. This method described gives relief only when vitreous strands traverse the whole bulbus crosswise. The follow-up period is up to the present three months to a year.

Adolescent↗
PubMed1995

[Traction vitreoretinal opticopathy in proliferative diabetic vitreoretinopathy].

UNLABELLED: In patients with proliferative diabetic vitreoretinopathy the authors noticed tractive vitreoretinal distortion of the optic disk to the nasal side. As a result of this distortion a reduction in visual acuity, pallor of the optic disk, and changes in the visual evoked potentials were registered. The disease in called "tractive vitreoretinal opticopathy." METHOD: We examined 15 diabetics with vitreoretinal traction and temporal pallor of the optic disk, as well as a reduction in visual acuity. Six patients were observed retrospectively and 9 patients prospectively before and after vitrectomy. Pre- and postoperative examinations included visual acuity, visual field, fluorescence angiography, and the conduction of visual evoked potentials (VEP). RESULTS: Within a postoperative follow-up of 2-8 months (mean 6.5 months) a return of optical vitality combined with an increase in visual acuity could be seen in 14 of 15 patients. In addition, some of the patients showed an improvement in the amplitudes and a reduction in the latency of the VEP. CONCLUSIONS: The authors assume that the axoplasmatic flow in the optic nerve fibers is reduced according to vitreoretinal traction. Furthermore, the traction may cause elongation of the capillaries, resulting in reduced perfusion of the optic disk. For these reasons early vitrectomy in patients with tractive vitreoretinal opticopathy is recommended.

Adult↗
PubMed1997

Tractional force generation by porcine Müller cells. Development and differential stimulation by growth factors.

PURPOSE: To assess the ability of retinal Müller cells to generate tractional forces during dedifferentiation in culture and to assess their responsiveness to contraction-stimulating growth factors. METHODS: Müller cells were isolated from papain-DNase-digested porcine retina. The identity of the isolated cells was confirmed by immunodetection of carbonic anhydrase II (CA-II), cellular retinaldehyde-binding protein (CRALBP), glial fibrillary acidic protein (GFAP), vimentin, and alpha smooth muscle actin (alpha SMA). Tractional force generation was assessed as a function of Müller cell contraction of collagenous extracellular matrices in vitro. The effects of potential promoters were assessed by addition directly to culture medium. The contributions of specific promoting to the contraction-promoting activity in serum were assessed by adding neutralizing antibodies and measuring loss of stimulatory activity. RESULTS: Freshly isolated Müller cells did not generate substantial matrix contraction. However, this activity increased 150-fold within 12 days in culture and continued to increase during the next 21 days. Development of the capacity for extracellular matrix contraction coincided with the acquisition of immunodetectable alpha SMA and loss of GFAP. Matrix contraction by Müller cells was stimulated in a dose-dependent fashion by human serum, platelet-derived growth factor (PDGF), and insulin-like growth factor-I (IGF-I). Müller cells were not stimulated by transforming growth factor beta 1 (TGF beta 1), transforming growth factor beta 2 (TGF beta 2), or endothelin-1 (E1). Neutralizing antibodies against PDGF and IGF-I reduced the activity in human serum by 37% and 58%, respectively, and 87% when added together. CONCLUSIONS: Porcine Müller cells in culture acquire the ability to contract extracellular matrices and thus generate tractional forces. Acquisition of this activity coincides with alpha SMA expression and loss of GFAP. Further, this activity is dependent on the presence of exogenous promoters, including PDGF or IGF-I.

Animals↗
PubMed1996

Vitreomacular traction syndrome confused with pseudophakic cystoid macular edema.

Vitreomacular traction syndrome causes visual loss as a consequence of persistent traction on the fovea from an attached posterior hyaloid. The diagnosis can be challenging because the attachment may be subtle. Cystoid macular edema secondary to cataract extraction is well known and can occur in the absence of any surgical complication. Herein, a patient is described who had vitreomacular traction syndrome diagnosed after uneventful cataract surgery. Pars plana vitrectomy with detachment of the posterior hyaloid restored vision to an acceptable level. Careful examination and clinical suspicion are important because recognition and surgical intervention will benefit the majority of these patients.

Aged↗
PubMed2001

Electrophysiological analysis of pudendal neuropathy following traction.

Pudendal neuropathy is an unusual but important complication of orthopedic surgical procedures involving traction on the fracture table. We describe the clinical and electrophysiological features in six patients presenting with perineal sensory disorders and sexual dysfunction following surgical repair of femoral fracture, hip dislocation, or intra-articular foreign body, in which the traction table was used. All underwent electrophysiological recordings: bulbocavernosus muscle electromyography (EMG), measurements of the bulbocavernosus reflex latencies (BCRLs), somatosensory evoked potentials of the pudendal nerve (SEPPNs), sensory conduction velocity of the dorsal nerve of the penis (SCVDNP), and pudendal nerve terminal motor latencies (PNTMLs). Signs of denervation localized to the territory of the pudendal nerve were found in 3 patients, normal BCRL in 6, abnormal SEPPNs in 4, and abnormal SCVDNPs and PNTMLs in all cases. The outcome at 2-year follow-up was good, except in one patient with initially unrecordable PNTML. Perineal electrophysiological examination can thus confirm the pudendal neuropathy and give prognostic information.

Adolescent↗
PubMedDate not supplied

Halo skeletal traction pin site care: toward developing a standard of care.

Halo skeletal traction may be used to immobilize a patient's head and neck following a cervical fracture. Prevention of infectious reactions around the pin sites of halo traction is a priority in rehabilitation nursing practice. Although prophylactic treatment of skeletal pin sites is a generally accepted practice, there is great diversity of opinion and very limited systematic investigation as to how the sites should be treated. In this article, the author reviews the literature on pin site care and suggests a protocol based on the current literature.

Bone Nails↗
PubMed2002

Traction injury of common peroneal nerve associated with multiple ligamentous rupture of the knee: a case report.

We report on a case of a 19-year-old male student who sustained a hyperextension injury to his left knee while playing rugby, which resulted in a traction injury of the common peroneal nerve and multiple ligamentous injuries at the knee joint. The damaged part of the common peroneal nerve was resected, and an end-to-end suture was performed, because the gap between the nerve ends was small enough to allow closure with little mobilization. Now, 2.5 years after the surgery, the patient shows remarkable recovery. This result suggests that end-to-end suture is an ideal procedure for nerve traction injury, if the nerve ends can be closed without tension, without excessive flexion of the adjacent joint.

Adult↗
PubMed1984

[Hangman's fracture in ventrally flexed traction].

Hangman's fracture in ventrally flexed traction between 10(6) and 75 degrees is analyzed on the basis of 220 fracture trials on plaster of real bone preparations of the atlas and axis of two adults. Hangman's fractures, which are usually regarded as a form of injury from dorsal flexion, occurred in 25% of the fracture trials under this kind of strain. Frequency depended on flexion angle, as well as on inclination of the dens axis. Thus Hangman's fractures occurred, as a whole, more frequently in the kyphotic dens type than in the lordotic type and were found as a rule at 75 degrees flexion. Furthermore, the investigations showed that pedicles can by no means be regarded as the sole predilection site for fracture. A detailed description is provided on why the Hangman's fracture type, due to ventrally flexed traction, can be included in the group of bone injuries arising from flexion, with tensile stress of the dorsal parts of the dens and the corpus axis, on the one hand, and the upper side of the axis arch on the other. Hence, the injury picture ranges from the dorsal arch fracture to the horizontal rupture through the superior articular facies and the corpus axis, as documented by substantial evidence.

Adult↗
PubMed1985

The treatment of fractures of the tibial plateau by skeletal traction and early mobilisation.

We have treated all varieties of fractures of the tibial plateau, including lateral, medial and bicondylar fractures by skeletal traction and early mobilisation. A study of 50 such fractures is presented and the functional results are evaluated. The average follow up is 2 years. The results of skeletal traction and early mobilisation are shown to be good in 94% of the cases. We wish to demonstrate the extent of remoulding and ultimate reformation of the condyles which occurs, and the recovery of movement of the joint which is achieved by this method.

Adult↗
PubMed1980

Reduction and fusion of severe spondylolisthesis using halo-pelvic traction with a wire reduction device.

Seven patients with severe lumbosacral spondylolisthesis were treated by reduction of the displacement followed by stabilisation by anterior interbody fusion. In the two youngest patients full reduction was achieved by halo-pelvic traction. In the remainder halo-pelvic or femoral traction was combined with a posterior wire reduction device. All patients achieved a sound fusion with complete remission of symptoms.

Adolescent↗