Changes in pulse waveforms in response to intraocular pressure elevation determined by laser speckle flowgraphy in healthy subjects

BMC Ophthalmology

Tomohiko Akahori¹  Hiroko Terasaki¹  Eimei Ra¹  Kentaro Yamamoto¹  Ryo Tomita¹  Chie Iwase²  Takeshi Iwase² 

[1] Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan;Department of Ophthalmology, Nagoya University Graduate School of Medicine, Nagoya, Japan;Department of Ophthalmology, Akita University Graduate School of Medicine, 1-1-1 Hondou, Akita-city, 010-8543, Akita, Japan;

关键词: Laser speckle flowgraphy;    Intraocular pressure;    Elevation;    Optic nerve head;   

DOI  :  10.1186/s12886-021-02070-7

来源: Springer

【 摘 要 】

BackgroundThe influences of intraocular pressure (IOP) elevations on the pulse waveform in the optic nerve head (ONH) were evaluated using laser speckle flowgraphy (LSFG) in normal subjects.MethodsThis prospective cross-sectional study was conducted at the Nagoya University Hospital. An ophthalmodynamometer was pressed on the sclera to increase the IOP by 20 mmHg or 30 mmHg for 1 min (experiment 1, 16 subjects) and by 30 mmHg for 10 min (experiment 2, 10 subjects). The mean blur rate (MBR) and the eight pulse waveform parameters determined using LSFG were measured before, immediately after and during an IOP elevation, and after the IOP returned to the baseline pressure.ResultsA significant elevation in the IOP and a significant reduction in the ocular perfusion pressure (OPP) were found after applying the ophthalmodynamometer (both, P < 0.001). The blowout score (BOS) reduced significantly (P < 0.001), and the flow acceleration index (FAI; P < 0.01) and resistivity index (RI; P < 0.001) increased significantly immediately after increasing the IOP by 20 or 30 mmHg (experiment 1). The BOS reduced significantly (P < 0.001), and the FAI (P < 0.01) and RI (P < 0.001) increased significantly after the IOP elevation by 30 mmHg in both experiment 2 and 1. However, the BOS and RI recovered significantly at time 10 compared to that in time 0 (immediately after IOP elevation) during the 10-min IOP elevation (P < 0.001 and P = 0.008, respectively).ConclusionsIn conclusion, the BOS, FAI, and RI of the pulse waveforms changed significantly with an acute elevation in the IOP. The change should be related to the larger difference between the maximum and minimum MBRs during the IOP elevation.

【 授权许可】

CC BY