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Changes in intraocular pressure after clear corneal phacoemulsification in normal patients.

Bhallil S, Andalloussi IB, Chraibi F, Daoudi K, Tahri H - Oman J Ophthalmol (2009)

Bottom Line: Our patients showed a mean decrease in IOP of 2.25 mmHg (16%) compared to preoperative values.Age, sex and axial length were not significantly related to IOP reduction (P = 0.2-0.5) CCP was associated with a statistically significant reduction in IOP.The exact mechanism by which cataract surgery results in IOP reduction is unclear.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, University Hospital, Hassan II, Fez, Morocco.

ABSTRACT

Purpose: To evaluate changes in intraocular pressure (IOP) after clear corneal phacoemulsification (CCP) in normal patients.

Materials and methods: A prospective study including 273 normal patients selected for cataract extraction by CCP. Intraocular pressure was recorded on the 15(th) day, l(st), 2(nd), 3(rd) month and 6 months after surgery.

Statistical analysis: For statistical analysis, Epi Info was used to determine the statistical significance of changes in IOP.

Results: The mean age of 96 women and 177 men was 71 ± 12 years. The mean IOP before surgery was 14.18 ± 3.4 mmHg. Our patients showed a mean decrease in IOP of 2.25 mmHg (16%) compared to preoperative values. Change in IOP was not related to lens thickness (P = 0.12), but significantly correlated with change in anterior chamber depth (ACD) (P = 0.002). The postoperative IOP was inversely related to preoperative ACD (P = 0.012). Age, sex and axial length were not significantly related to IOP reduction (P = 0.2-0.5)

Conclusion: CCP was associated with a statistically significant reduction in IOP. The exact mechanism by which cataract surgery results in IOP reduction is unclear. CCP can be performed with the intent of achieving better IOP control.

No MeSH data available.


Related in: MedlinePlus

Reduction of IOP in different series. Table showing IOP in the preoperative period and one month after surgery. An IOP reduction varying from 0.5 to 3 mmHg is observed
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Figure 0004: Reduction of IOP in different series. Table showing IOP in the preoperative period and one month after surgery. An IOP reduction varying from 0.5 to 3 mmHg is observed

Mentions: Numerous studies have shown that cataract surgery by phacoemulsification with posterior chamber IOL induces a mid-and long-term lowering of IOP.[5‐10] Although elevations in IOP may occur in the immediate postoperative period due to retained viscoelastic material, the IOP is known to normalize within two to four hours.[11‐15] IOP decrease after CCP in normal patients has been demonstrated by Jahn,[7] Shingleton,[8] Tong and Miller.[10] They showed a reduction of IOP varying from 0.5 to 3 mmHg.[716‐19] In our study, the mean reduction was 2.25 mmHg (15.77%) [Figure 4]. Central corneal thickness was not assessed. Since IOP can vary considerably based on corneal thickness, this fact may be considered as a limiting factor of this study


Changes in intraocular pressure after clear corneal phacoemulsification in normal patients.

Bhallil S, Andalloussi IB, Chraibi F, Daoudi K, Tahri H - Oman J Ophthalmol (2009)

Reduction of IOP in different series. Table showing IOP in the preoperative period and one month after surgery. An IOP reduction varying from 0.5 to 3 mmHg is observed
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2903914&req=5

Figure 0004: Reduction of IOP in different series. Table showing IOP in the preoperative period and one month after surgery. An IOP reduction varying from 0.5 to 3 mmHg is observed
Mentions: Numerous studies have shown that cataract surgery by phacoemulsification with posterior chamber IOL induces a mid-and long-term lowering of IOP.[5‐10] Although elevations in IOP may occur in the immediate postoperative period due to retained viscoelastic material, the IOP is known to normalize within two to four hours.[11‐15] IOP decrease after CCP in normal patients has been demonstrated by Jahn,[7] Shingleton,[8] Tong and Miller.[10] They showed a reduction of IOP varying from 0.5 to 3 mmHg.[716‐19] In our study, the mean reduction was 2.25 mmHg (15.77%) [Figure 4]. Central corneal thickness was not assessed. Since IOP can vary considerably based on corneal thickness, this fact may be considered as a limiting factor of this study

Bottom Line: Our patients showed a mean decrease in IOP of 2.25 mmHg (16%) compared to preoperative values.Age, sex and axial length were not significantly related to IOP reduction (P = 0.2-0.5) CCP was associated with a statistically significant reduction in IOP.The exact mechanism by which cataract surgery results in IOP reduction is unclear.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, University Hospital, Hassan II, Fez, Morocco.

ABSTRACT

Purpose: To evaluate changes in intraocular pressure (IOP) after clear corneal phacoemulsification (CCP) in normal patients.

Materials and methods: A prospective study including 273 normal patients selected for cataract extraction by CCP. Intraocular pressure was recorded on the 15(th) day, l(st), 2(nd), 3(rd) month and 6 months after surgery.

Statistical analysis: For statistical analysis, Epi Info was used to determine the statistical significance of changes in IOP.

Results: The mean age of 96 women and 177 men was 71 ± 12 years. The mean IOP before surgery was 14.18 ± 3.4 mmHg. Our patients showed a mean decrease in IOP of 2.25 mmHg (16%) compared to preoperative values. Change in IOP was not related to lens thickness (P = 0.12), but significantly correlated with change in anterior chamber depth (ACD) (P = 0.002). The postoperative IOP was inversely related to preoperative ACD (P = 0.012). Age, sex and axial length were not significantly related to IOP reduction (P = 0.2-0.5)

Conclusion: CCP was associated with a statistically significant reduction in IOP. The exact mechanism by which cataract surgery results in IOP reduction is unclear. CCP can be performed with the intent of achieving better IOP control.

No MeSH data available.


Related in: MedlinePlus