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Biomedical subjects

G Mackensen

Publications and source records attributed to G Mackensen.

At least 19 recordsLinked to original sources
PubMed1988

[Iridocyclectomy using a lamellar explorative technic. Long-term studies].

The question as to whether lamellar explorative iridocyclectomy always enables the spread of tumors of the iris base or ciliary body to be detected beyond doubt was verified in 11 patients who had been treated by this procedure more than four years previously. Seven of the patients were available for reexamination. In two special cases it was found that this was not true. In the other patients neither histologic findings nor long-term follow-up revealed any tumor spread beyond the excision area, and in particular no invasion of the sclera.

Aged↗
PubMed1985

[Surgical indications in glaucoma].

A number of aspects of glaucoma surgery are discussed. Complete drainage of the aqueous via the subconjunctival space results in underperfusion of the trabecular meshwork, leading to significant impairment of the trabecular function. In certain cases, therefore, we prefer trabeculotomy, even though its pressure-lowering effect is inferior to that of fistulizing surgery: trabeculotomy preserves the unaffected trabecular meshwork. Laser trabeculoplasty has the advantage of increasing the outflow facility. In angle-closure glaucoma, iridectomy is performed as an initial procedure in every case in order to eliminate pupillary block. The transcorneal approach ensures watertight wound closure and preserves the conjunctiva for fistulizing surgery if necessary. Glaucoma surgery can usually be performed in lid akinesia and subconjunctival infiltration. This alternative helps to avoid retrobulbar injection when the optic nerve is already severely damaged by glaucoma.

Anesthesia, Local↗
PubMed1984

[How do patients assess their visual acuity after intracapsular cataract extraction and correction with eyeglasses].

In the investigation reported here, 115 patients who had undergone cataract surgery at least 1 year previously, and for whom cataract glasses had been prescribed, were asked to give a subjective assessment of their vision. Almost 50% of them mentioned impairment of vision in certain situations (traffic, descending stairs). Altogether, 75.7% of the patients interviewed considered their vision good; only 2.7% felt it was unsatisfactory. Defects characteristic of aphakia correction were also cited by patients with good visual acuity. On the other hand, even patients with relatively poor vision (macular disease) reported that they were satisfied. The patients' adaptation to the change in visual conditions brought about by the cataract glasses can only be described as remarkable.

Aged↗
PubMed1984

Late wound complications after circular keratotomy for zoster keratitis.

We observed spontaneous melting and separation of circular keratotomy wounds in two zoster patients 8 and 23 years, respectively, after surgery. In one case, it could be demonstrated that the upper part of the unaffected keratotomy wound was formed by a large epithelial plug. It is probable that this type of wound may cause late complications under unfavorable conditions.

Adult↗
PubMed1983

[Cataract extraction in chronic iridocyclitis. Long-term follow-ups].

Eighty-six patients with chronic anterior uveitis were followed up for an average of five years after cataract surgery. In most cases the course of the uveitis was favorably influenced: inflammatory signs were reduced in 70% and the frequency of recurrence in 94%. With regard to the postoperative course, there was no significant difference between the eyes in which an iris suture had been performed and those in which it had not. One should therefore not hesitate to remove cataracts in patients with chronic uveitis.

Cataract↗
PubMed1982

[Aniridia caused by contusion-related rupture of a bleb following Elliot's trepanation].

This case report deals with a 68-year-old man in whom a contusion resulted in a complete loss of the iris through an Elliot fistula. The abrupt increase in intraocular pressure caused the iris to be extruded through the fistula and the ruptured conjunctiva. A functional drainage bleb was reconstructed by pulling and suturing subconjunctival tissue underneath the ruptured conjunctiva.

Aged↗
PubMed1982

[Riegers' anomaly with signs of hydrophthalmia and spontaneous pressure regulation].

Several members of two families with Rieger's anomaly were found to have signs of hydrophthalmia (enlarged corneas, Descemet ruptures, optic disc damage). Two of them revealed normal intraocular pressures during later life without medical or operative treatment. Obviously a spontaneous pressure regulation had occurred. A delayed differentiation of the trabecular meshwork is possibly the cause of self-regulation in these two cases of Rieger's anomaly as in case with congenital glaucoma.

Adolescent↗
PubMed1979

[Long-term follow-ups of iris sutures (author's transl].

Previous reports from the Freiburg Eye Clinic concerning surgical techniques and experiences with iris sutures are complemented by this description of long-term follow-ups (up to 8 years, 6 1/2 years on average) of a random selection of 65 eye which underwent surgery. There were no harmful reactions to the suture of the suture material (nylon, 30 micrometers). Three-fourths of the eyes examined presented with tissue bridges, indicating fibroblastic unification of the sutured tissues. Even where there was preoperative atrophy of the connected iris parts (following glaucoma attacks with iris infarction) the connection remained stable over the years. These long-term follow-up findings support earlier recommendations concerning indication and surgical technique.

Follow-Up Studies↗
PubMed1978

Progress in cataract surgery using microsurgical technique.

A microsurgical technique for cataract extraction is presented. The operations were performed with a corneal incision and a continuous nylon 10-0 suture. This technique is evaluated by the study of 1289 cases, consecutively operated on. The complication rate was very low. Haemorrhage in the anterior chamber was found in 1%. Delayed reformation of the anterior chamber occurred in only two cases. No cases of iris prolapse occurred. The intraocular pressure was not interferred with by the operation. Wound rupture following removal of the suture three months post-operatively occurred in 1%. The advantages of the corneal incision and continuous nylon suture are discussed (less irritation, good and secure wound closure).

Cataract Extraction↗