How many milliliters of brainstem hemorrhage are fatal?

Written by Gao Yi Shen

Neurosurgery

Updated on February 08, 2025

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Brainstem hemorrhage does not have a specific volume that can be fatal; the brainstem is the central hub for respiration and circulation in the human body, including the medulla, midbrain, and pons. For the pons and midbrain, a hemorrhage of five milliliters can be fatal. For the medulla, which is very narrow and densely packed with neural tissue, even one milliliter of bleeding can suddenly cause the patient's respiration and circulation to stop. Therefore, even one milliliter of brainstem hemorrhage is an immeasurable loss, and brainstem hemorrhages should be classified as critically severe. Immediate hospitalization and treatment are crucial to achieve a relatively better prognosis.

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Written by Tang Li Li

Neurology

1min

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Causes of brainstem hemorrhage convulsions

Seizures may occur due to a brainstem hemorrhage for several reasons, First, significant edema following a brainstem hemorrhage, combined with the mass effect of the hemorrhage itself, can lead to substantial compression of the brainstem, potentially resulting in tonic seizures. Second, the irritation from the hemorrhage could trigger symptomatic epilepsy, with the patient possibly experiencing partial new epileptic seizures that evolve into generalized tonic-clonic seizures. Third, the brainstem hemorrhage might cause high fever, which could induce febrile convulsions, also leading to seizures. Fourth, the treatment of brainstem hemorrhage often involves the use of high doses of diuretics. If severe dehydration occurs, it can lead to a state of excessive dehydration, electrolyte imbalance, and hyperosmolarity; high sodium levels might also trigger seizures.

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Written by Gao Yi Shen

Neurosurgery

46sec

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Symptoms and signs of brainstem hemorrhage

The symptoms and signs of brainstem hemorrhage must be judged based on the situation. There are many nerve fibers in the brainstem, and bleeding in any area could lead to different clinical manifestations. The most common general symptoms include headache, nausea, dizziness, vomiting, and numbness and weakness in the limbs, and even conditions such as drowsiness, stupor, and even coma may occur. If more severe, it could cause abnormal rhythms in heart and respiratory functions, and some special symptoms might appear. For example, hemorrhage in the midbrain might cause bilateral pupil constriction, especially pinpoint constriction; if the hemorrhage occurs in the medulla, it could cause respiratory and circulatory arrest early on.

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Written by Chen Yu Fei

Neurosurgery

48sec

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Dietary Precautions for Brainstem Hemorrhage

For patients with brainstem hemorrhage, attention should be given to their diet. During the acute phase, it is advisable to choose a liquid diet, as most patients with brainstem hemorrhage often have severe swallowing dysfunction. Failing to choose a liquid diet can lead to aspiration, which in turn causes aspiration pneumonia. Furthermore, patients should avoid certain foods for a short period, particularly greasy or spicy foods, as most patients experience significant reductions in digestive function during the acute phase. If dietary intake is not carefully managed, patients often experience significant abdominal pain and diarrhea. Once the patient's condition stabilizes, it is appropriate to include fresh vegetables and fruits in their diet.

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Written by Tang Li Li

Neurology

57sec

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Is there any sensation before brainstem hemorrhage?

The most common cause of brainstem hemorrhage is generally hypertension. The mechanism by which hypertension causes bleeding is chronic long-term hypertension, leading to hyaline degeneration of the small arterial walls. Under the force of blood flow, these walls are prone to bulging, leading to the formation of microaneurysms. When blood pressure fluctuates sharply, especially when there is a significant increase, it can cause these microaneurysms to rupture, leading to bleeding. Thus, if there are noticeable symptoms before the hemorrhage, they are mostly due to a sudden increase in blood pressure. Patients often experience dizziness or headaches, sometimes along with blurred vision, and may be accompanied by nausea and vomiting, but most patients may not feel any abnormalities before the bleeding occurs.

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Written by Zhang Hui

Neurology

1min 2sec

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Does brainstem hemorrhage easily recur?

The main cause of brainstem hemorrhage is hypertension, which can lead to hyalinization in the arteries that supply the brainstem, and even the formation of small aneurysms. Under the impact of blood flow, these are prone to rupture, leading to hemorrhage in the brainstem. This is the primary mechanism of onset for brainstem hemorrhage. If the brainstem hemorrhage is caused by hypertension, maintaining good control of blood pressure and keeping it below the ideal level of 140-90 mmHg can prevent frequent recurrence, so there is no need for excessive worry, but it is crucial to monitor blood pressure regularly. Additionally, brainstem hemorrhages can also be caused by other reasons, such as cavernous hemangiomas or arteriovenous malformations. If brainstem hemorrhage is caused by these diseases, and the abnormal vessels are not surgically removed, recurrence is likely. Removing these abnormal vessels can greatly reduce the likelihood of recurrent brainstem hemorrhages.