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Biomedical subjects

S Rauz

Publications and source records attributed to S Rauz.

9 recordsLinked to original sources
PubMed1997

Capsulorhexis phymosis following uncomplicated phacoemulsification surgery.

PURPOSE: The aim of the study was to assess and compare the degree of capsulorhexis phymosis following uncomplicated phacoemulsification cataract surgery in polymethylmethacrylate (PMMA) and silicone lens implants. METHOD: Sixty-four patients were evaluated 1 day, 6 weeks and 6 months following phacoemulsification cataract extraction. The anterior capsular diameters were measured with the illuminated beam of the slit lamp at 45 degrees and 135 degrees and the surface area of the opening calculated. We have measured and compared the change in the capsulorhexis size for both lens types and assessed its statistical significance with a paired Student's t-test. RESULTS: A statistically significant contraction of the capsulorhexis was noted in all patients within the first 6 weeks (p < 0.001). Capsular contraction continued between 6 weeks and 6 months post-operatively but to a lesser extent (p < 0.05). The difference in the degree of phymosis between the first period (1 day to 6 weeks) and the second (6 weeks to 6 months) was statistically highly significant for all patients (p < 0.001). The capsular areas for the silicone lens implants were significantly smaller than for the PMMA implants at 6 weeks and 6 months. None of our patients had a clinically significant capsular contracture requiring Nd:YAG laser capsulotomy. CONCLUSION: Anterior capsular contraction is commonly observed following capsulorhexis in phacoemulsification surgery. This study demonstrates that the maximum rate of contraction occurs in the first 6 weeks following surgery and is more pronounced with silicone lens implants.

Aged↗
PubMed1997

Variation in astigmatism following the single-step, self-sealing clear corneal section for phacoemulsification.

PURPOSE: A single-step, self-sealing, 3.2 mm clear corneal section is described and the incidence and variation of surgically induced astigmatism following phacoemulsification over a period of 3 months is determined. METHODS: Twenty-two patients who underwent uncomplicated 3.2 mm clear corneal phacoemulsification with foldable Allergan silicone intraocular lens implantation were autorefracted pre-operatively and on day 1, week 1, week 6 and at 3 months. The variation in induced astigmatism was analysed using the subtraction method and vector analysis. The change in direction of the cylindrical axis was examined. RESULTS: The induced astigmatism represented by the total vector on day 1 was 1.17 D and vector decomposition ratio, ATR:WTR (against-the-rule:with-the-rule), was 21.05:78.95. The total vector increased by 0.5 D in the first week and then stabilised. Vector decomposition showed an against-the-rule astigmatic drift so that by 3 months the ATR:WTR was 40.49:59.91. There was a tendency of the axis of the negative cylinder to swing towards the corneal section meridian on day 1 and to oscillate around that meridian at week 1 and week 6. By 3 months the direction reverted to that pre-operatively, in most cases. CONCLUSIONS: The single-step, self-sealing clear corneal section is mechanically stable and, though there is some variability in the measured astigmatism, there is an acceptable functional result throughout the post-operative period.

Aged↗
PubMed1997

Sub-Tenon's anesthesia and orbicularis oculi function.

BACKGROUND AND OBJECTIVE: To assess the necessary volume of local anesthetic with added hyaluronidase that must be infiltrated to the sub-Tenon's space to achieve complete eyelid akinesia. PATIENTS AND METHODS: Eighty-five consecutive patients were randomly assigned to two groups, receiving either 5 ml or 7 ml of local anesthetic to the sub-Tenon's space. Each patient was assessed clinically at 5 and 10 minutes for orbicularis oculi function. The anesthetic solution consisted of 5 ml of 2% lidocaine, 5 ml of 0.75% bupivacaine hydrochloride, and 1500 IU of hyaluronidase. A top-up of anesthetic infiltration was given in doses of 2 ml if excessive orbicularis muscle function persisted at 10 ml. Routine phacoemulsification surgery was performed, and, if necessary, a top-up of anesthetic was given on the table. RESULTS: Complete eyelid akinesia was achieved in 7.5% (3 of 40) of the patients in the 5-ml group and in 93.3% (42 of 45) of the patients in the 7-ml group (P < .005). There was no effect for 57.5% (23 of 40) of the patients in the 5-ml group and for 2.2% (1 of 45) of the patients in the 7-ml group. A top-up of anesthetic was given in the anesthetic room to 40 patients, 37 of whom were in the 5-ml group, and a Van Lint block of the facial nerves was necessary for 1 patient from the 5-ml group. An on-the-table top-up of anesthesia was necessary for 3 patients (2 from the 5-ml group, 1 from the 7-ml group). CONCLUSIONS: The addition of hyaluronidase promotes diffusion of sub-Tenon's anesthetic, resulting in effective akinesia of the orbicularis oculi. The infiltration of 7 ml of the anesthetic solution significantly improves the rate of eyelid akinesia.

Aged↗
PubMed1996

One stage vertical rectus muscle recession using adjustable sutures under local anaesthesia.

AIMS: To assess the results of visual axis alignment following one stage adjustable suture surgery to correct vertical diplopia. METHOD: Eight patients with a mean age of 44.9 years (range 16-80 years) complaining of vertical diplopia underwent rectus muscle recession under local anaesthesia with intraoperative adjustment of sutures. Diplopia was secondary to superior oblique paresis in four patients, dysthyroid eye disease in two patients, superior rectus paresis in one patient, and one developed a consecutive deviation after previous squint surgery. The surgery consisted of seven single muscle recessions (six inferior recti and one superior rectus) and one two muscle recession (inferior and lateral recti). The surgery was performed under topical anaesthesia supplemented with a subconjunctival injection of local anaesthetic over the muscle insertions. RESULTS: The patients remained comfortable throughout their surgery. All had a reduction in their vertical deviation. Six were asymptomatic and were eventually discharged. One had residual diplopia which was well tolerated without further intervention. One had persistent troublesome diplopia which was corrected by temporary Fresnel prisms. He became asymptomatic after further surgery of a 1 mm inferior rectus advancement. CONCLUSION: One stage adjustable suture surgery is recommended in all cases of strabismus surgery when postoperative results would otherwise be unpredictable.

Adolescent↗