During the test, you will sit with your chin resting on a support. The OCT scan uses light waves to create an image, similar to an ultrasound that uses sound waves to create an image. SEE RELATED: What Is a Digital Retinal Image? Schedule an appointment with an eye doctor near you, if you suspect you may have glaucoma or any other eye condition that an OCT exam can help detect. The OCT scan can also be performed in a dark room, which facilitates faster and more accurate results- especially when the position of the anterior angle in a darkened room is of utmost importance in the diagnosis of angle-closure glaucoma. The OCT provides cross-sectional images of the anterior angle, and facilitates detection of open-angle or angle closure glaucoma, as well as narrowing of the anterior angle, which can lead to angle-closure glaucoma. If the drainage channel is not working properly, it can lead to an increase in eye pressure, and cause damage to the optic nerve and vision loss. The anterior angle is the drainage channel for fluid inside the eye. The OCT scan is a useful tool in evaluating the anterior angle in patients at risk of developing glaucoma. OCT scans are used for diagnosis, management or treatment of a variety of ocular conditions: The images produced by the OCT scan are also a practical tool in helping patients understand the problem they may be experiencing, as the complication can be seen clearly and in 3D on the screen. The color-coded images provide a wealth of information to help your eye doctor measure the thickness of your retina and identify any optic nerve abnormalities. The OCT scan uses a laser (without radiation) to obtain higher resolution images of the layers of the retina and optic nerve. The use of intra-vessel imaging.An optical coherence tomography scan (OCT scan) is a critical device for the early diagnosis of many serious eye conditions.Īn OCT eye exam is a non-invasive test that provides 3-D color-coded, cross sectional images of the retina to enable early detection and treatment of ocular disease that may develop without any noticeable symptoms. The BPA is an emerging method of treatment of patients with inoperable CTEPH. m2) and 6-minute walking test (6-MWT) increased to 430 m.Three more BPA sessions at intervals of a few weeks were performed and mPAP was reduced to 29 mm Hg (mRAP – 7 mm Hg, PCWP – 13 mm Hg, PVR – 167 dyn Four inflations of a 2.0 mm × 20 mm semi-compliant balloon with the pressure of 4–10 atm were performed along the entire artery with good angiographic and hemodynamic effects (Figure 1 C). The diameter of the vessel was 2.23 mm × 2.42 mm. Surprisingly, OCT revealed extensive changes in the proximal and mid part of the target artery (“colander lesions” or meshwork) (Figure 1 B). Subsequently the vessel was accurately measured in several locations and the proper size of the balloon was selected to reduce the risk of post-reperfusion oedema. Iodinated contrast was infused at a flow rate of 5 ml/s over 4 s at 400 psi of pressure and OCT images were acquired. Then optical coherence tomography (OCT) of the target vessel was performed with the DragonFly (St. Subsequently a Whisper MS coronary guidewire (Abbott Vascular, Santa Clara, Ca, USA) was advanced through the lesion to the distal part of the vessel. Selective pulmonary angiography revealed the subtotally occluded A1 segmental branch of the left pulmonary artery (Figure 1 A). The 90-cm long 6Fr sheath (Flexor Shuttle Guiding Sheath, Cook Medical, Bloomington, IN, USA) and right Judkins 6-Fr guide catheter were used to achieve a good approach to the ostium of the A1 + A2 segmental branch. The BPA was performed from a right femoral vein approach. Functional testing demonstrated a reduced 6-minute walk distance of 220 m. m2) and pulmonary scintigraphy showed multiple segmental perfusion defects (segments 1, 2, 8, 9 in the left lung and 2, 3, 4, 5, 6 in the right lung).Right heart catheterisation confirmed pulmonary hypertension (mean pulmonary artery pressure (mPAP) 37 mm Hg, mean right atrial pressure (mRAP) 6 mm Hg, pulmonary capillary wedge pressure (PCWP) 13 mm Hg, pulmonary vascular resistance (PVR) 214 dyn A 71-year-old woman with non-operable, peripheral type chronic thrombo-embolic pulmonary hypertension (CTEPH) and with World Health Organisation (WHO) class III dyspnoea was admitted to our department for balloon pulmonary angioplasty (BPA).
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