Mr. Roberts, a 65-year-old male. presents to the emergency department with sudden onset of severe pain in his right eye. blurred vision, seeing halos around lights, nausea, and vomiting. His right eye is red the cornea appears cloudy, and his intraocular pressure is elevated. What is the most likely diagnosis?
Conjunctivitis
Acute angle-closure glaucoma
Retinal detachment
Migraine with aura
The Correct Answer is B
A. Conjunctivitis. Conjunctivitis generally presents with redness and discharge but does not cause elevated intraocular pressure, severe pain, or visual disturbances like halos.
B. Acute angle-closure glaucoma. Acute angle-closure glaucoma is characterized by sudden severe eye pain, blurred vision, halos around lights, nausea, and vomiting, along with elevated intraocular pressure and a cloudy cornea.
C. Retinal detachment. Retinal detachment may cause sudden vision loss or flashing lights but typically lacks pain, nausea, or vomiting, and does not affect intraocular pressure.
D. Migraine with aura. A migraine with aura may cause visual disturbances but does not present with eye pain, red eye, or elevated intraocular pressure.
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View Related questions
Correct Answer is B
Explanation
A. The glomerular filtration rate decreases because there is a reduction of blood flow to the kidneys. Reduced blood flow to the kidneys, or renal hypoperfusion, decreases the glomerular filtration rate (GFR) because less blood is being filtered through the kidneys. This can occur in conditions such as shock, severe dehydration, or heart failure, but it is not the primary mechanism in acute tubular necrosis (ATN).
B. The glomerular filtration rate decreases because there is injury to the renal tubular cells. In ATN, the injury to renal tubular cells impairs their function, leading to reduced reabsorption and filtration ability, which contributes to the decrease in GFR.
C. The glomerular filtration rate decreases because inflammatory cells invade the already damaged kidneys. While inflammation may be present, it is not the primary cause of decreased GFR in acute tubular necrosis; reduced blood flow and tubular cell injury are more direct causes.
D. The glomerular filtration rate decreases because there is obstruction leading to the filtration system backing up and eventually shutting the kidneys down. Obstruction is not typically a characteristic of acute tubular necrosis; ATN is usually caused by ischemic or toxic injury, not physical obstruction.
Correct Answer is C
Explanation
A. Deep vein thrombosis. Deep vein thrombosis typically causes constant pain, swelling, and redness and does not improve with rest.
B. Restless leg syndrome. Restless leg syndrome is characterized by an uncontrollable urge to move the legs, usually at rest, and is not associated with walking.
C. Intermittent claudication. Intermittent claudication is a common symptom of PAD where muscle pain or cramping occurs during activity and is relieved with rest due to insufficient blood flow.
D. Varicose veins. Varicose veins generally cause aching and swelling rather than pain triggered specifically by walking.