Achieve Mastery of Medical Concepts

Study for medical school and boards with Lecturio

USMLE Step 1     |     USMLE Step 2   |    COMLEX Level 1   |     COMLEX Level 2   |     ENARM   |    NEET

Create your free account
The Lecturio Medical Concept Library
Retinal Vessel Occlusion

Retinal Vessel Occlusion

A retinal vessel occlusion is a blockage in a major artery or vein of the retina Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the optic nerve and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the choroid and the inner surface with the vitreous body. The outermost layer is pigmented, whereas the inner nine layers are transparent. Eye: Anatomy. Depending on the location, the occlusion can be classified as central retinal artery occlusion (CRAO), branch retinal artery occlusion (BRAO), central retinal vein occlusion (CRVO), or branch retinal vein occlusion (BRVO). Typically, a retinal vessel occlusion is a thromboembolic event. Risk factors include hypertension Hypertension Hypertension, or high blood pressure, is a common disease that manifests as elevated systemic arterial pressures. Hypertension is most often asymptomatic and is found incidentally as part of a routine physical examination or during triage for an unrelated medical encounter. Hypertension, diabetes Diabetes Diabetes mellitus (DM) is a metabolic disease characterized by hyperglycemia and dysfunction of the regulation of glucose metabolism by insulin. Type 1 DM is diagnosed mostly in children and young adults as the result of autoimmune destruction of β cells in the pancreas and the resulting lack of insulin. Type 2 DM has a significant association with obesity and is characterized by insulin resistance. Diabetes Mellitus mellitus, and cardiac Cardiac Total Anomalous Pulmonary Venous Return (TAPVR) valvular disease. Central retinal artery occlusion is characterized by sudden, unilateral, painless loss of vision Vision Ophthalmic Exam and/or transient vision Vision Ophthalmic Exam loss ( amaurosis fugax Amaurosis fugax Transient complete or partial monocular blindness due to retinal ischemia. This may be caused by emboli from the carotid artery (usually in association with carotid stenosis) and other locations that enter the central retinal artery. Carotid Artery Stenosis). Treatment options are limited in all cases and usually ineffective. When the macula Macula An oval area in the retina, 3 to 5 mm in diameter, usually located temporal to the posterior pole of the eye and slightly below the level of the optic disk. It is characterized by the presence of a yellow pigment diffusely permeating the inner layers, contains the fovea centralis in its center, and provides the best phototropic visual acuity. It is devoid of retinal blood vessels, except in its periphery, and receives nourishment from the choriocapillaris of the choroid. Eye: Anatomy is involved, prognosis Prognosis A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations. Non-Hodgkin Lymphomas is especially poor, leading to permanent vision Vision Ophthalmic Exam loss.

Last updated: 28 Mar, 2022

Editorial responsibility: Stanley Oiseth, Lindsay Jones, Evelin Maza

Contents

Anatomy

  • The internal carotid artery Internal carotid artery Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose. Carotid Arterial System: Anatomy enters the skull Skull The skull (cranium) is the skeletal structure of the head supporting the face and forming a protective cavity for the brain. The skull consists of 22 bones divided into the viscerocranium (facial skeleton) and the neurocranium. Skull: Anatomy through the carotid foramen and branches into the ophthalmic artery Ophthalmic artery Artery originating from the internal carotid artery and distributing to the eye, orbit and adjacent facial structures. Eye: Anatomy, which further divides into:
    • The central retinal artery (occlusion (CRAO); supplies the inner â…” of the retina Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the optic nerve and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the choroid and the inner surface with the vitreous body. The outermost layer is pigmented, whereas the inner nine layers are transparent. Eye: Anatomy) 
    • The posterior ciliary arteries Arteries Arteries are tubular collections of cells that transport oxygenated blood and nutrients from the heart to the tissues of the body. The blood passes through the arteries in order of decreasing luminal diameter, starting in the largest artery (the aorta) and ending in the small arterioles. Arteries are classified into 3 types: large elastic arteries, medium muscular arteries, and small arteries and arterioles. Arteries: Histology (branch retinal artery occlusion (BRAO); supply the outer â…“ of the retina Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the optic nerve and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the choroid and the inner surface with the vitreous body. The outermost layer is pigmented, whereas the inner nine layers are transparent. Eye: Anatomy)
  • The central retinal vein (occlusion (CRVO)) 
    • Drains either into the superior ophthalmic vein or the cavernous sinus directly
Ophthalmic artery and branches

The carotid artery with the ophthalmic artery Ophthalmic artery Artery originating from the internal carotid artery and distributing to the eye, orbit and adjacent facial structures. Eye: Anatomy and branches. Note the central retinal artery and posterior choroidal arteries Arteries Arteries are tubular collections of cells that transport oxygenated blood and nutrients from the heart to the tissues of the body. The blood passes through the arteries in order of decreasing luminal diameter, starting in the largest artery (the aorta) and ending in the small arterioles. Arteries are classified into 3 types: large elastic arteries, medium muscular arteries, and small arteries and arterioles. Arteries: Histology, which enter the eye around the optic nerve Optic nerve The 2nd cranial nerve which conveys visual information from the retina to the brain. The nerve carries the axons of the retinal ganglion cells which sort at the optic chiasm and continue via the optic tracts to the brain. The largest projection is to the lateral geniculate nuclei; other targets include the superior colliculi and the suprachiasmatic nuclei. Though known as the second cranial nerve, it is considered part of the central nervous system. The 12 Cranial Nerves: Overview and Functions.

Image by BioDigital, edited by Lecturio
Close up of branches of the eye

Superior view: The internal carotid artery Internal carotid artery Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose. Carotid Arterial System: Anatomy branches into the ophthalmic artery Ophthalmic artery Artery originating from the internal carotid artery and distributing to the eye, orbit and adjacent facial structures. Eye: Anatomy, which further divides into the central retinal artery and the posterior ciliary arteries Arteries Arteries are tubular collections of cells that transport oxygenated blood and nutrients from the heart to the tissues of the body. The blood passes through the arteries in order of decreasing luminal diameter, starting in the largest artery (the aorta) and ending in the small arterioles. Arteries are classified into 3 types: large elastic arteries, medium muscular arteries, and small arteries and arterioles. Arteries: Histology.

Image by BioDigital, edited by Lecturio
Ophthalmic veins

The superior ophthalmic vein and the cavernous sinus, into which the central retinal vein drains.

Image by BioDigital, edited by Lecturio

Related videos

6:07
Hypertensive Retinopathy

Etiology

Central retinal artery occlusion/branch retinal artery occlusion

  • Embolism (most common cause of ipsilateral CRAO) 
    • Cardiogenic or atherosclerotic (most commonly of carotid origin) 
      • Risk factors include:  
        • Hypertension Hypertension Hypertension, or high blood pressure, is a common disease that manifests as elevated systemic arterial pressures. Hypertension is most often asymptomatic and is found incidentally as part of a routine physical examination or during triage for an unrelated medical encounter. Hypertension
        • Diabetes Diabetes Diabetes mellitus (DM) is a metabolic disease characterized by hyperglycemia and dysfunction of the regulation of glucose metabolism by insulin. Type 1 DM is diagnosed mostly in children and young adults as the result of autoimmune destruction of β cells in the pancreas and the resulting lack of insulin. Type 2 DM has a significant association with obesity and is characterized by insulin resistance. Diabetes Mellitus mellitus
        • Atrial fibrillation Atrial fibrillation Atrial fibrillation (AF or Afib) is a supraventricular tachyarrhythmia and the most common kind of arrhythmia. It is caused by rapid, uncontrolled atrial contractions and uncoordinated ventricular responses. Atrial Fibrillation
        • Cardiac Cardiac Total Anomalous Pulmonary Venous Return (TAPVR) valvular problems/patent foramen ovale Foramen ovale An opening in the wall between the right and the left upper chambers (heart atria) of a fetal heart. Oval foramen normally closes soon after birth; when it fails to close the condition is called patent oval foramen. Patent Foramen Ovale (leads to clots breaking off) 
    • Cholesterol Cholesterol The principal sterol of all higher animals, distributed in body tissues, especially the brain and spinal cord, and in animal fats and oils. Cholesterol Metabolism embolism; usually occurs after vessel catheterization
    • Septic embolism, as a consequence of infective endocarditis Endocarditis Endocarditis is an inflammatory disease involving the inner lining (endometrium) of the heart, most commonly affecting the cardiac valves. Both infectious and noninfectious etiologies lead to vegetations on the valve leaflets. Patients may present with nonspecific symptoms such as fever and fatigue. Endocarditis
  • Inflammatory conditions such as temporal arteritis Temporal arteritis Giant cell arteritis (GCA), also known as temporal arteritis, is a type of large-vessel vasculitis that predominantly affects the aorta and its major branches, with a predilection for the branches of the carotid (including the temporal artery). Giant cell arteritis is defined by inflammatory leukocytes in the vessel walls leading to reactive damage, ischemia, and necrosis. Giant Cell Arteritis and other forms of vasculitis Vasculitis Inflammation of any one of the blood vessels, including the arteries; veins; and rest of the vasculature system in the body. Systemic Lupus Erythematosus

Central retinal vein occlusion/branch retinal vein occlusion

Exact causes are not known, although there is an association with the following conditions:

  • Atherosclerotic conditions
    • Hypertension Hypertension Hypertension, or high blood pressure, is a common disease that manifests as elevated systemic arterial pressures. Hypertension is most often asymptomatic and is found incidentally as part of a routine physical examination or during triage for an unrelated medical encounter. Hypertension
    • Hypercholesterolemia Hypercholesterolemia A condition with abnormally high levels of cholesterol in the blood. It is defined as a cholesterol value exceeding the 95th percentile for the population. Lipid Disorders
    • Smoking Smoking Willful or deliberate act of inhaling and exhaling smoke from burning substances or agents held by hand. Interstitial Lung Diseases
    • Diabetes Diabetes Diabetes mellitus (DM) is a metabolic disease characterized by hyperglycemia and dysfunction of the regulation of glucose metabolism by insulin. Type 1 DM is diagnosed mostly in children and young adults as the result of autoimmune destruction of β cells in the pancreas and the resulting lack of insulin. Type 2 DM has a significant association with obesity and is characterized by insulin resistance. Diabetes Mellitus mellitus
    • Obesity Obesity Obesity is a condition associated with excess body weight, specifically with the deposition of excessive adipose tissue. Obesity is considered a global epidemic. Major influences come from the western diet and sedentary lifestyles, but the exact mechanisms likely include a mixture of genetic and environmental factors. Obesity
  • Hypercoagulable Hypercoagulable Hypercoagulable states (also referred to as thrombophilias) are a group of hematologic diseases defined by an increased risk of clot formation (i.e., thrombosis) due to either an increase in procoagulants, a decrease in anticoagulants, or a decrease in fibrinolysis. Hypercoagulable States state
    • Sickle cell anemia Sickle cell anemia A disease characterized by chronic hemolytic anemia, episodic painful crises, and pathologic involvement of many organs. It is the clinical expression of homozygosity for hemoglobin S. Sickle Cell Disease
    • Antiphospholipid syndrome Antiphospholipid syndrome Antiphospholipid syndrome (APLS) is an acquired autoimmune disorder characterized by the persistent presence of antiphospholipid antibodies, which create a hypercoagulable state. These antibodies are most commonly discovered during a workup for a thrombotic event or recurrent pregnancy loss, which are the 2 most common clinical manifestations. Antiphospholipid Syndrome
    • Multiple myeloma Multiple myeloma Multiple myeloma (MM) is a malignant condition of plasma cells (activated B lymphocytes) primarily seen in the elderly. Monoclonal proliferation of plasma cells results in cytokine-driven osteoclastic activity and excessive secretion of IgG antibodies. Multiple Myeloma
  • Inflammatory (e.g., systemic lupus erythematosus Systemic lupus erythematosus Systemic lupus erythematosus (SLE) is a chronic autoimmune, inflammatory condition that causes immune-complex deposition in organs, resulting in systemic manifestations. Women, particularly those of African American descent, are more commonly affected. Systemic Lupus Erythematosus ( SLE SLE Systemic lupus erythematosus (SLE) is a chronic autoimmune, inflammatory condition that causes immune-complex deposition in organs, resulting in systemic manifestations. Women, particularly those of African American descent, are more commonly affected. Systemic Lupus Erythematosus))
  • Pharmacological (e.g., oral contraceptive Oral contraceptive Compounds, usually hormonal, taken orally in order to block ovulation and prevent the occurrence of pregnancy. The hormones are generally estrogen or progesterone or both. Benign Liver Tumors pills)
  • CRVO is categorized into 2 types based on etiology: ischemic (hemorrhagic retinopathy Retinopathy Degenerative changes to the retina due to hypertension. Alport Syndrome) and nonischemic (venous stasis retinopathy Retinopathy Degenerative changes to the retina due to hypertension. Alport Syndrome)
Retinal artery occlusion

Image showing a color fundus Fundus The superior portion of the body of the stomach above the level of the cardiac notch. Stomach: Anatomy photograph of the left eye Left Eye Refractive Errors with CRAO; retinal artery attenuation (arrows) and optic disc Optic disc The portion of the optic nerve seen in the fundus with the ophthalmoscope. It is formed by the meeting of all the retinal ganglion cell axons as they enter the optic nerve. Eye: Anatomy pallor

Image: “ Color fundus photography Color Fundus Photography Macular Degeneration of the left eye Left Eye Refractive Errors” by Division of Cardiology, Department of Internal Medicine, Pohang St. Mary’s Hospital, Pohang, Republic of Korea. License: CC BY 4.0
Retinal vessel occlusion

Fundus photograph of the right eye indicating CRAO/CRVO: a “blood and thunder” appearance and “cherry red” spot are both seen in this image (a patient with systemic lupus erythematosus Systemic lupus erythematosus Systemic lupus erythematosus (SLE) is a chronic autoimmune, inflammatory condition that causes immune-complex deposition in organs, resulting in systemic manifestations. Women, particularly those of African American descent, are more commonly affected. Systemic Lupus Erythematosus)

Image: “ Chorea Chorea Involuntary, forcible, rapid, jerky movements that may be subtle or become confluent, markedly altering normal patterns of movement. Hypotonia and pendular reflexes are often associated. Conditions which feature recurrent or persistent episodes of chorea as a primary manifestation of disease are referred to as choreatic disorders. Chorea is also a frequent manifestation of basal ganglia diseases. Huntington Disease and retinal vessel occlusion” by Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences AND Iranian Center of Neurological Research Research Critical and exhaustive investigation or experimentation, having for its aim the discovery of new facts and their correct interpretation, the revision of accepted conclusions, theories, or laws in the light of newly discovered facts, or the practical application of such new or revised conclusions, theories, or laws. Conflict of Interest, Tehran, Iran. License: CC BY 2.0

Clinical Presentation and Diagnosis

Clinical presentation Presentation The position or orientation of the fetus at near term or during obstetric labor, determined by its relation to the spine of the mother and the birth canal. The normal position is a vertical, cephalic presentation with the fetal vertex flexed on the neck. Normal and Abnormal Labor

Central retinal artery occlusion

  • Sudden, painless, complete monocular vision loss
  • Patients may recall transient similar episodes (e.g., amaurosis fugax)
  • Fundoscopic examination reveals:
    • Pallor of optic disc due to narrowed arteries
    • “Cherry red” spot in the macula Macula An oval area in the retina, 3 to 5 mm in diameter, usually located temporal to the posterior pole of the eye and slightly below the level of the optic disk. It is characterized by the presence of a yellow pigment diffusely permeating the inner layers, contains the fovea centralis in its center, and provides the best phototropic visual acuity. It is devoid of retinal blood vessels, except in its periphery, and receives nourishment from the choriocapillaris of the choroid. Eye: Anatomy (at the fovea Fovea An area approximately 1. 5 millimeters in diameter within the macula lutea where the retina thins out greatly because of the oblique shifting of all layers except the pigment epithelium layer. It includes the sloping walls of the fovea (clivus) and contains a few rods in its periphery. In its center (foveola) are the cones most adapted to yield high visual acuity, each cone being connected to only one ganglion cell. Eye: Anatomy centralis)

Central retinal vein occlusion

  • May be sudden or gradual, painless, monocular vision loss
  • Fundoscopic examination reveals
    • Swollen optic disc (papilledema) and engorged retinal veins with hemorrhage
    • “Blood and thunder” appearance due to extensive hemorrhage (ischemic type) 
    • “Cotton-wool” spots: white deposits on the retina Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the optic nerve and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the choroid and the inner surface with the vitreous body. The outermost layer is pigmented, whereas the inner nine layers are transparent. Eye: Anatomy due to swelling Swelling Inflammation of the retinal nerve (ischemic type)

Diagnosis

Diagnosis of both conditions is usually clinical but additional investigations may be ordered.

  • Fluorescein Fluorescein A phthalic indicator dye that appears yellow-green in normal tear film and bright green in a more alkaline medium such as the aqueous humor. Pseudomonas angiography Angiography Radiography of blood vessels after injection of a contrast medium. Cardiac Surgery (to differentiate ischemic from non-ischemic forms of CRVO)
  • Optical coherence Coherence A view of the world and the individual’s environment as comprehensible, manageable, and meaningful, claiming that the way people view their life has a positive influence on their health. Neurological Examination tomography (used to assess the progression of retinal vein occlusion or response to treatment)
  • Carotid doppler Doppler Ultrasonography applying the doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. Ultrasound (Sonography) 
  • Erythrocyte sedimentation rate Erythrocyte Sedimentation Rate Soft Tissue Abscess ( ESR ESR Soft Tissue Abscess) and C-reactive protein (CRP): to rule out vasculitides Vasculitides Vasculitides are a group of conditions characterized by vasculitis, ischemia, and damage to the organs supplied by the affected vessels. The affected arteries are of different sizes and locations and vary by the type of vasculitis. Vasculitides
Central retinal vein occlusion

Image of a 15-year-old girl with left intraretinal hemorrhaging (CRVO) (patient has a history of systemic lupus and antiphospholipid antibodies Antiphospholipid antibodies Autoantibodies directed against phospholipids. These antibodies are characteristically found in patients with systemic lupus erythematosus, antiphospholipid syndrome; related autoimmune diseases, some non-autoimmune diseases, and also in healthy individuals. Antiphospholipid Syndrome)

Image: “Finding of eye fundus Fundus The superior portion of the body of the stomach above the level of the cardiac notch. Stomach: Anatomy” by Department of Pediatrics and Child Neurology, Oita University Faculty of Medicine, Hasama, Yufu, Oita 879-5593, Japan. License: CC BY 2.0
Cherry red spot

Left eye showing “cherry red” spot with retinal pallor typical of CRAO (arrow)

Image: “Acute central retinal artery occlusion” by James Paget University Hospital NHS Foundation Trust Trust Confidence in or reliance on a person or thing. Conflict of Interest, Lowestoft Road, Gorleston, Great Yarmouth NR31 6LA, Norfolk, UK. License: CC BY 2.0

Differential Diagnosis

  • Vitreous hemorrhage Vitreous Hemorrhage Hemorrhage into the vitreous body. Diseases of the Vitreous Body: intraocular bleeding in or around the vitreous body Vitreous body The transparent, semigelatinous substance that fills the cavity behind the crystalline lens of the eye and in front of the retina. It is contained in a thin hyaloid membrane and forms about four fifths of the optic globe. Eye: Anatomy usually from trauma, a retinal tear, or any disease causing neovascularization. Patients Patients Individuals participating in the health care system for the purpose of receiving therapeutic, diagnostic, or preventive procedures. Clinician–Patient Relationship present with floaters Floaters Chorioretinitis and cloudy vision Vision Ophthalmic Exam. Treatment includes surgery and avoiding anticoagulants Anticoagulants Anticoagulants are drugs that retard or interrupt the coagulation cascade. The primary classes of available anticoagulants include heparins, vitamin K-dependent antagonists (e.g., warfarin), direct thrombin inhibitors, and factor Xa inhibitors. Anticoagulants. Vitreous hemorrhage Vitreous Hemorrhage Hemorrhage into the vitreous body. Diseases of the Vitreous Body is differentiated from a vessel occlusion due to a more gradual onset and the presence of floaters Floaters Chorioretinitis. 
  • Retinal detachment Retinal detachment Retinal detachment is the separation of the neurosensory retina from the retinal pigmented epithelium and choroid. Rhegmatogenous retinal detachment, the most common type, stems from a break in the retina, allowing fluid to accumulate in the subretinal space. Retinal Detachment: separation of the neurosensory retina Retina The ten-layered nervous tissue membrane of the eye. It is continuous with the optic nerve and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the choroid and the inner surface with the vitreous body. The outermost layer is pigmented, whereas the inner nine layers are transparent. Eye: Anatomy from the retinal pigment epithelium Retinal Pigment Epithelium The single layer of pigment-containing epithelial cells in the retina, situated closely to the tips (outer segments) of the retinal photoreceptor cells. These epithelial cells are macroglia that perform essential functions for the photoreceptor cells, such as in nutrient transport, phagocytosis of the shed photoreceptor membranes, and ensuring retinal attachment. Hypertensive Retinopathy. Classically, the condtion presents as a curtain descending over the eye causing painless vision Vision Ophthalmic Exam loss, but can also cause floaters Floaters Chorioretinitis and flashes early on. Most common causes are aging and trauma. Diagnosis is with direct eye exam and ultrasound. Treatment is surgery by laser or freezing. 
  • Cataracts: opacification of the lens Lens A transparent, biconvex structure of the eye, enclosed in a capsule and situated behind the iris and in front of the vitreous humor (vitreous body). It is slightly overlapped at its margin by the ciliary processes. Adaptation by the ciliary body is crucial for ocular accommodation. Eye: Anatomy in the eye, which leads to a decrease in vision Vision Ophthalmic Exam. Cataracts often develop slowly in one or both eyes Both Eyes Refractive Errors. Risk factors are age and eye injury. Symptoms may include blurry or double vision Vision Ophthalmic Exam, trouble with bright lights, halos around light, faded colors, and trouble seeing at night. Cataracts can be visualized as a cloudy lens Lens A transparent, biconvex structure of the eye, enclosed in a capsule and situated behind the iris and in front of the vitreous humor (vitreous body). It is slightly overlapped at its margin by the ciliary processes. Adaptation by the ciliary body is crucial for ocular accommodation. Eye: Anatomy on eye exam. Curative treatment is surgical replacement of the lens Lens A transparent, biconvex structure of the eye, enclosed in a capsule and situated behind the iris and in front of the vitreous humor (vitreous body). It is slightly overlapped at its margin by the ciliary processes. Adaptation by the ciliary body is crucial for ocular accommodation. Eye: Anatomy.

References

  1. Hedges III, T. R. (2018). Central and branch retinal artery occlusion. UpToDate. Retrieved September 24, 2020, from https://www.uptodate.com/contents/central-and-branch-retinal-artery-occlusion?search=retinal%20vascular%20occlusion&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1#H17
  2. Covert, D. J. , & Han, D. P. (2019). Retinal vein occlusion: Epidemiology, clinical manifestations, and diagnosis. UpToDate. Retrieved September 24, 2020, from https://www.uptodate.com/contents/retinal-vein-occlusion-epidemiology-clinical-manifestations-and-diagnosis?search=retinal%20vascular%20occlusion&source=search_result&selectedTitle=2~150&usage_type=default&display_rank=2#H7614371
  3. Hayreh SS, Podhajsky PA, Zimmerman MB. (2009). Retinal Artery Occlusion Associated Systemic and Ophthalmic Abnormalities. Ophthalmology.
© 2021 Lecturio GmbH. All rights reserved.

USMLE™ is a joint program of the Federation of State Medical Boards (FSMB®) and National Board of Medical Examiners (NBME®). MCAT is a registered trademark of the Association of American Medical Colleges (AAMC). NCLEX®, NCLEX-RN®, and NCLEX-PN® are registered trademarks of the National Council of State Boards of Nursing, Inc (NCSBN®). None of the trademark holders are endorsed by nor affiliated with Lecturio.

Study on the Go

Lecturio Medical complements your studies with evidence-based learning strategies, video lectures, quiz questions, and more – all combined in one easy-to-use resource.

Learn even more with Lecturio:

Complement your med school studies with Lecturio’s all-in-one study companion, delivered with evidence-based learning strategies.

START NOW FOR FREE

User Reviews

¡Hola!

Esta página está disponible en Español.

Versión en Español

🍪 Lecturio is using cookies to improve your user experience. By continuing use of our service you agree upon our Data Privacy Statement.

got it
Details