What causes fever from brainstem hemorrhage?

Written by Tang Li Li
Neurology
Updated on January 28, 2025
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Patients with brainstem hemorrhage experience fever generally for the following three reasons: First, infection. Patients with brainstem hemorrhage often have disturbances of consciousness and dysfunction of the throat, and are bedridden, which frequently leads to aspiration pneumonia and hypostatic pneumonia. This is due to weakened ability to clear phlegm, as well as choking caused by saliva and feeding. Additionally, infections can easily occur in the gastrointestinal tract, urinary tract, and from skin pressure sores. Second, abnormalities in the temperature set point cause central hyperthermia. In patients with brainstem hemorrhage, the temperature regulation center is damaged. If the temperature regulating center sets the body temperature above 38 degrees Celsius, it often persists and cannot be reduced, and medications are poorly effective in lowering the temperature, necessitating the use of ice packs for physical cooling. Third, patients with brainstem hemorrhage often use large doses of diuretics. Dehydration after diuretic use can put patients in a state of excessive dehydration. If rehydration therapy is not adequately managed, dehydration fever can easily occur.

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Is brainstem hemorrhage painful?

Brainstem hemorrhage is relatively painful, and most patients with brainstem hemorrhage will exhibit severe headaches and dizziness. The nature of the pain is intense, resembling a cutting pain that is hard to tolerate. However, when the amount of bleeding is large, it can quickly cause damage to important nerve nuclei in the brainstem, and even affect the central nervous system responsible for consciousness, leading to the patient falling into a stupor or coma. In such cases, the patient may not feel pain, but for those who are conscious, severe headaches and dizziness, accompanied by a strong sense of vertigo, especially noticeable when changing positions, often occur.

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The critical period for brainstem hemorrhage is several days.

For patients with brainstem hemorrhage, the first week after the onset is a critical period. During this time, the bleeding may gradually increase, and secondary cerebral edema may occur, leading to dysfunction of the brainstem and even respiratory and circulatory failure, which can endanger the patient's life. Therefore, for these patients, it is crucial to closely monitor any changes in their condition, transfer them to the intensive care unit, and closely monitor their vital signs. Special attention should be paid to the patient's blood pressure, respiration, heart rate, pupil reactions, consciousness, and limb activity. Dynamic follow-up head CT scans should be performed to observe any changes in the condition.

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Written by Tang Ying
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How long is the edema period for brainstem hemorrhage?

The edema phase of the brain stem generally lasts for two to three weeks, with the peak of swelling occurring around seven to ten days. For some patients, the swelling completely subsides nearly a month later. Only after the peak of the swelling has passed can patients be out of life-threatening danger. As the swelling gradually subsides, the patient's consciousness, vital signs, limb movements, eating, and other symptoms will also gradually improve. Once patients get through the swelling phase, we can start early bedside rehabilitation as soon as possible. In addition to using some drugs that nourish brain nerves, passive limb movements, proper limb positioning, early exercise, and acupuncture can all be started early to accelerate the patient's early rehabilitation and prevent complications such as muscle atrophy, relaxation, and dependent pneumonia, which can be improved early on.

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How long does it take to wake up from a coma caused by brainstem hemorrhage?

The timing of awakening after a coma caused by a brainstem hemorrhage must be judged based on the situation. As brainstem hemorrhages are relatively severe, there is generally no possibility of awakening if the patient's breathing, heartbeat, and circulation are not stable. If the patient can breathe normally off a ventilator and has a normal heartbeat and other vital signs, and pupil responses are also normal, then typically, they may awaken within one to two weeks. However, recovery times vary from person to person depending on the specifics of the condition, the location of the hemorrhage, and the surrounding tissue involved. Therefore, assessments should be made based on specific clinical signs at the time. Particularly with hemorrhages in the medulla oblongata, once coma ensues, it's often impossible to fully awaken the patient, and many succumb to complications later on. Therefore, adequate psychological preparation is essential in clinical settings.

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Is brainstem hemorrhage dangerous?

The brainstem is the central hub of life in the human body, controlling vital functions such as blood pressure, pulse, respiration, body temperature, and consciousness. Bleeding in this area is extremely dangerous and is a life-threatening condition. Clinically, it has a high mortality and disability rate. For hemorrhages larger than 5 mL, most patients will succumb to central respiratory and circulatory failure within 48 hours. Even if the bleeding is less than 5 mL, although aggressive resuscitation may save the patient's life, most will suffer from severe brain dysfunction such as hemiplegia, aphasia, or a vegetative state. Therefore, brainstem hemorrhage is very dangerous.