Cerebral infarction caused by an ascending aortic thrombus associated with systemic capillary leak syndrome: a case report
This case report describes a rare instance of cerebral infarction caused by an ascending aortic thrombus in a patient with systemic capillary leak syndrome, highlighting how severe haemoconcentration and endothelial dysfunction during the acute leak phase can synergistically promote de novo arterial thrombosis.
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The human body relies on a delicate balance to keep blood flowing smoothly through its vast network of vessels. Normally, the walls of these vessels act as a tight seal, holding fluid and cells inside while allowing nutrients to pass through. However, in a rare and dangerous condition known as systemic capillary leak syndrome, this seal suddenly fails. The tiny vessels throughout the body become overly permeable, allowing blood plasma to leak out into surrounding tissues. This causes the blood itself to become dangerously thick and concentrated, while the body's tissues swell with fluid. Because the blood volume drops so sharply, the heart struggles to pump, leading to a state of shock that can damage organs and, in some cases, trigger the formation of blood clots. While doctors have long known that this condition can cause clots in the veins, a new report brings attention to a much rarer and more dangerous possibility: clots forming in the main artery leaving the heart.
A team of researchers at Hiratsuka City Hospital in Japan recently documented a striking case involving a 62-year-old man who fell victim to this rare complication. The man arrived at the emergency department with severe swelling in his limbs, very low urine output, and dangerously low blood pressure. Blood tests revealed that his blood had become incredibly thick, with a measure of red blood cells reaching 70 percent, far above the normal range, while his protein levels had plummeted. These signs, combined with a history of similar episodes and the presence of a specific protein in his blood, led doctors to diagnose him with systemic capillary leak syndrome. During his stay, his condition worsened to the point where fluid buildup in his leg required emergency surgery to relieve pressure. Just two days after being admitted, while eating breakfast, he suddenly lost the ability to speak and could not move the right side of his body.
Urgent imaging of his brain showed that a major artery supplying the left side of his brain had been blocked by a clot, causing a stroke. Doctors performed a minimally invasive procedure to physically remove the clot from the artery, successfully restoring blood flow. However, the source of the clot remained a mystery. Standard checks for common causes, such as heart defects or hardened arteries, came up empty. To find the culprit, the medical team performed a specialized scan of the man's chest and major blood vessels. This scan revealed a blood clot attached to the wall of the ascending aorta, the large artery that carries blood directly from the heart to the rest of the body. Crucially, the scan showed no signs of an aneurysm, a tear in the vessel wall, or the usual buildup of fatty plaque that typically causes such clots. The clot appeared to have formed from scratch, or de novo, within the vessel itself.
The researchers believe that the unique conditions created by the leak syndrome were responsible for this event. When the man's blood pressure dropped and his blood became so thick, the flow of blood through his body slowed down significantly. At the same time, the lining of his blood vessels was likely damaged by the same process that caused the leak. This combination of sluggish flow, thick blood, and a roughened vessel wall created the perfect environment for a clot to form in the ascending aorta. Once formed, a piece of this clot broke off and traveled upward to the brain, causing the stroke. The medical team treated the patient with blood-thinning medication, and follow-up scans two weeks later showed that the clot in the aorta had completely disappeared.
This case highlights a critical lesson for medical care: when a patient with systemic capillary leak syndrome suffers a stroke, doctors must look beyond the heart and the usual suspects for the source of the clot. The ascending aorta, which is rarely a site for clots in people without structural heart disease, can become a dangerous source of embolism during the acute phase of this syndrome. The study suggests that the extreme changes in blood thickness and vessel health during a leak episode can drive the formation of new clots in unexpected places. While this is just one documented instance, it serves as a reminder that the body's response to such a severe leak can have far-reaching and life-threatening consequences for the entire circulatory system. The authors emphasize that further cases need to be studied to fully understand how often this happens and how best to treat it, but for this patient, rapid imaging and targeted treatment made the difference between a catastrophic outcome and recovery.
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