INTRAOCULAR PRESSURE AFTER VITRECTOMY WITH VARIOUS MATERIALS FOR INTERNAL TAMPONADE

Jerzy A. Mackiewicz, J. Klos-Rola, M. Polak M, E. Suchodola-Ratajewicz, Z. Zagórski (Lublin)

Aim of study: to analyse intraocular pressures (IOP) in patients after pars plana vitrectomy (PPV) with various materials for internal tamponade used.

Materials and methods: The study included 62 patients (62 eyes) - 37 (59,68 %) women and 25 (40,32 %) men aged from 20 to 87 years (mean age 54,3) who were randomised from the population of patients who underwent PPV in the I Department of Ophthalmology from March 2000 to April 2001. They were divided into 3 groups:

•   I - PPV with gas (17 % perfluoropropane) tamponade - 30 eyes
  
•   II - PPV with silicon oil tamponade - 18 eyes
  
•   III - PPV without any internal tamponade - 14 eyes
  

Pressure measurements were performed by use of Schiötz tonometer 24 hours before, immediately after, 6, 24 hours after surgery and 3, 5, 14 and 30 days later. Threshold for an elevated IOP was 25 mmHg and for hypotony 5 mmHg.

Results: Increased IOP was observed in 29 eyes (46,0 %) while decreased IOP was observed in 24 eyes (38,1 %). In group I increased IOP was noticed in 17 (56,7%) eyes, decreased in 10 (33,3); in group II increased in 7 (38,9 %) and decreased in 9 (50,0 %) eyes while in group III increased IOP was observed in 5 (35,7 %) and decreased in 5 (35,7 %) eyes. The tables I and II consist of numbers of eyes with increased and decreased IOP, respectively, in following time-points for respective groups.



There were no statistically significant differences of mean IOP between groups analysed except from 14 day, when statistically significant difference between group I (Mn_IOP =14,89±6,12, p=0,026) and group II (Mn_IOP =12,67±5,99, p =0,002) in comparison to group III (Mn_IOP =19,62±6,56) was noticed.

Conclusions:
1. The highest percentages of increased IOP were observed in group I in
    early post operative period.
2. The highest percentages of decreased IOP were observed in group I in
    late while in group II in early post-operative period.
3. No correlations between percentages of eyes with increased or decreased
    IOP and time-points of measurements in group III was noticed.
4. There were no statistically significant differences between mean IOP
    in respective groups of patients who underwent PPV depending on
    materials for internal tamponade used.


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