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[Continuous intraocular pressure measurement over several days with the Codman Microsensor--a case report]
1Augenklinik am Klinikum Neubrandenburg, Akademisches Lehrkrankenhaus, Ernst-Moritz-Arndt-Universität.
Klinische Monatsblatter Fur Augenheilkunde
|October 21, 1999
Summary
Continuous intraocular pressure monitoring using an anterior chamber probe accurately measured high intraocular pressure in two patients when applanation tonometry failed. This method provides reliable data for managing complex eye conditions.
Area of Science:
- Ophthalmology
- Biomedical Engineering
Background:
- Applanation tonometry is often unreliable for measuring intraocular pressure (IOP) in eyes with irregular surfaces, such as those with corneal edema, scars, or post-keratoplasty.
- Traditional methods like anterior chamber puncture provide only single, short-term IOP measurements, limiting the assessment of pressure fluctuations.
- Continuous IOP monitoring is necessary in cases where applanation tonometry yields inaccurate results or does not correlate with clinical observations.
Observation:
- A neurosurgical micro sensor was implanted into the anterior chamber of two patients via a scleral tunnel for continuous IOP monitoring (up to 96 hours).
- In both patients, applanation tonometry significantly underestimated IOP compared to finger palpation and clinical findings.
- The implanted probe provided continuous IOP data, revealing discrepancies and guiding therapeutic decisions.
Findings:
- Continuous intraocular measurement with the micro sensor confirmed that applanation tonometry provided erroneously low IOP readings in both cases.
- The sensor data correlated with finger palpation measurements, indicating the accuracy of the continuous monitoring system.
- The probe implantation was well-tolerated, with no significant intraocular complications reported during the monitoring period.
Implications:
- Continuous IOP monitoring is indicated when applanation tonometry results are unreliable or misleading in complex ocular conditions.
- Water-proof implantation via a scleral tunnel is feasible, offering a method for long-term IOP assessment.
- This technology allows for continuous IOP measurement and evaluation of individual responses to antiglaucomatous drugs, aiding in rational treatment planning.