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Authors
Advisor(s)
Abstract(s)
Introdução: A espessura corneana central é um dado biométrico importante na avaliação clínica de pacientes com hipertensão ocular e glaucoma, uma vez que influencia a medição da pressão intraocular pelo método de Goldmann e é um fator de risco independente para o desenvolvimento de glaucoma primário de âgulo aberto.
Objetivo: Pretende-se comparar os valores de espessura corneana central usando a paquimetria ultrassónica (Accutome, AccuPach V) e o Pentacam HR (Oculus, Inc.). Metodologia: Inicialmente foi medida a pressão intraocular com o tonómetro de sopro (Visuplan 500, ZEISS) e, de seguida, mediu-se a espessura corneana central em 43 pacientes. Fizeram-se nove medições consecutivas com a paquimetria ultrassónica e com o Pentacam HR. Recorreu-se ao Teste t de Student para comparar a média das medições obtidas com os equipamentos. Resultados: Os valores encontrados para a média e desvio-padrão da espessura corneana central foram de 566,14 ± 33,47 μm para a paquimetria ultrassónica e de 559,03 ± 33,11 μm para o Pentacam HR. A diferença entre as médias das medições obtidas com os dois instrumentos foi de 7,11 μm com um intervalo de confiança de 3,50 a 10,71 μm (nível de confiança de 95%), a qual é estatisticamente significativa (p<0,05). O coeficiente de correlação obtido para as medições realizadas com os dois instrumentos de paquimetria foi de 0,87. Conclusão: Os valores obtidos com os dois instrumentos de medida apresentaram uma boa correlação. No entanto, existe uma diferença estatisticamente significativa entre eles, pelo que não são intermutáveis, sendo os obtidos com a paquimetria ultrassónica superiores.
ABSTRACT - Introduction: Central corneal thickness is an important biometric data in the clinical evaluation of patients with ocular hypertension and glaucoma since it influences the measurement of intraocular pressure by the Goldmann method and is an independent risk factor for the development of primary glaucoma of open angle. Objective: Compare corneal central thickness values using ultrasonic pachymetry (Accutome, AccuPach V) and Pentacam HR (Oculus, Inc.). Method: Intraocular pressure was measured with the blow tonometer (Visuplan 500, ZEISS) and corneal central thickness was measured in 43 patients. Nine consecutive measurements were made with ultrasonic pachymetry and with Pentacam HR. The Student's t-Test was used to compare the mean of the measurements obtained with the devices. Results: The values found for the mean and standard deviation of the central corneal thickness were 566.14 ± 33.47 μm for the ultrasonic pachymetry and 559.03 ± 33.11 μm for the Pentacam HR. The difference between the means of measurements obtained with the two instruments was of 7.11 μm with a confidence interval of 3.50 to 10.71 μm (95% confidence level), which is statistically significant (p<0.05). The correlation coefficient obtained for the measurements performed with the two pachymetry instruments was 0.87. Conclusion: The values obtained with both instruments presented a good correlation. However, there is a statistically significant difference between them, so they are not interchangeable, and those obtained with the ultrasonic pachymetry are superior.
ABSTRACT - Introduction: Central corneal thickness is an important biometric data in the clinical evaluation of patients with ocular hypertension and glaucoma since it influences the measurement of intraocular pressure by the Goldmann method and is an independent risk factor for the development of primary glaucoma of open angle. Objective: Compare corneal central thickness values using ultrasonic pachymetry (Accutome, AccuPach V) and Pentacam HR (Oculus, Inc.). Method: Intraocular pressure was measured with the blow tonometer (Visuplan 500, ZEISS) and corneal central thickness was measured in 43 patients. Nine consecutive measurements were made with ultrasonic pachymetry and with Pentacam HR. The Student's t-Test was used to compare the mean of the measurements obtained with the devices. Results: The values found for the mean and standard deviation of the central corneal thickness were 566.14 ± 33.47 μm for the ultrasonic pachymetry and 559.03 ± 33.11 μm for the Pentacam HR. The difference between the means of measurements obtained with the two instruments was of 7.11 μm with a confidence interval of 3.50 to 10.71 μm (95% confidence level), which is statistically significant (p<0.05). The correlation coefficient obtained for the measurements performed with the two pachymetry instruments was 0.87. Conclusion: The values obtained with both instruments presented a good correlation. However, there is a statistically significant difference between them, so they are not interchangeable, and those obtained with the ultrasonic pachymetry are superior.
Description
Mestrado em Gestão e Avaliação de Tecnologias em Saúde
Keywords
Oftalmologia Espessura corneana central Paquimetria ultrassónica Pentacam Pressão intraocular Ophthalmology Central corneal thickness Ultrasonic pachymetry Intraocular pressure
Citation
Nascimento FF. Paquimetria ultrassónica e Pentacam HR: estudo comparativo das medições de espessura corneana central [Dissertation]. Lisboa: Escola Superior de Tecnologia da Saúde de Lisboa/Instituto Politécnico de Lisboa; 2018.
Publisher
Instituto Politécnico de Lisboa, Escola Superior de Tecnologia da Saúde de Lisboa