Abstract

SA.01.06

Contact lens dynamometry after postural change

Seid-Fatima Seidova, Juliane Roos, Konstantin Kotliar, Ines Lanzl
Augenklinik, Klinikum rechts der Isar, Technische Universität München, München
1
Objective
Goldmann contact lens ophthalmodynamometry (ODM) is a non – invasive method for determining the blood pressure in central retinal artery and vein. It is widely used for the diagnosis of systemic and ocular vascular diseases. Whether blood pressure values measured with ODM are changed after postural change was investigated.
Methods
The prospective clinical study included 20 medically healthy subjects (10 females and 10 males) at the age of 26,0 (22,8; 27,7), (median(1.quartile; 3.quartile)). Measurements of the diastolic blood pressure in the central retinal artery and in the central retinal vein were performed with ODM in both eyes of each subject in a sitting upright and a supine body position. Systemic arterial blood pressure blood pressure by Riva-Rocci was measured additionally in both positions.
Results
Spontaneous venous pulsation was assessed in both positions in 48% of the eyes. Blood pressure in the central retinal vein was significantly higher (18 (13; 25) mmHg) in a supine position than in a sitting position (11 (8; 16) mmHg), p<0,01. Diastolic blood pressure in the central retinal artery was also significantly higher in a supine position then in a sitting position (60 (37; 93) vs. 35 (32; 39) mmHg), p<0,01. Although there was no significant difference in systolic blood pressure measured by Riva-Rocci between both postural positions, the diastolic blood pressure was 10 mmHg lower in a supine position.
Conclusions
Posture change leads to the increase of both systolic and diastolic blood pressures in the central retinal artery in a supine position. On the contrary blood pressure measured by Riva-Rocci is not higher but lower in a supine position. Our results might reveal a compensatory mechanism of the blood pressure regulation in the eye, which protects against an abrupt blood pressure reduction when changing into supine position.  ODM-measurements in glaucoma patients should be performed in a supine position in order to detect possible lacks of perfusion regulation.

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