Non-invasive Measurement of Hemoglobin in Retinal Arteries

Triemli Hospital

Status: Unknown

Conditions: Anemia; Healthy Subjects

Treatments: Device: Fundus photography, cubital blood draw

Study type: Observational

Funder types: Other

Identifiers

NCT01025011

D20028132

Details and patient eligibility

About

The purpose of this study is to test a new non-invasive tool to measure hemoglobin in retinal arteries.

Full description

To our knowledge no tool exists that allows for direct collection of hemoglobin data in the eye. In many eye diseases (especially diabetic and hypertensive retinopathy as well as in retinal vessel occlusions) retinal circulation is modified. Knowing hemoglobin concentration on the site of the pathology will give us further information about the pathogenesis of this diseases and may provide a new possibility in therapy.

The purpose of this study is to test a new non-invasive tool to measure hemoglobin in retinal arteries. Healthy volunteers from the eye clinic and pregnant otherwise healthy patients of the gynecological department of the Triemli Hospital, Zurich, as well as anemic gynecological patients that show up for a check-up are included.

Hemoglobin will be quantified by a blood draw of a cubital vein. Using a Fundus Camera (Nidek AFC-230) pictures of the fundus will be taken from each study patient. Afterwards the study investigator selects a retinal artery of interest which will be used for measuring the hemoglobin concentration. Intensity of the green channel of the camera chip is determined with the aid of the law of Lambert-Beer.

Absolute Hemoglobin concentration is calculated in relation to the vessel volume.

Enrollment: 100 estimated patients

Sex: All

Ages: 18 to 90 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• healthy volunteers
• pregnant patients from the Triemli Hospital that came for a routine check up
• anemic patients of the same dept with various gynecological tumors

Exclusion criteria

• any known retinal eye disease
• poor fundus picture quality due to fixtion problems or too small pupil or media intransparency
• not willing to participate in a study

Trial design

100 participants in 1 patient group

healthy volunteers, anemic patients

Description:

healthy volunteers from the eye and gynecology department pregnant patients with anemia

Treatment:

Device: Fundus photography, cubital blood draw