Management of subarachnoid hemorrhage (SAH)
If subarachnoid hemorrhage is suspected, the patient must be urgently hospitalized in a specialized neurosurgical unit. The choice of therapy is directly dictated by the cause of the vascular catastrophe. If it is established that the SAH resulted from the rupture of a vascular anomaly (e.g., an arteriovenous malformation or arterial saccular aneurysm), the patient is indicated for surgical treatment. In other situations, in the absence of clear vascular defects, conservative management is applied.
The optimal timeframe for excluding a ruptured saccular aneurysm from the circulation is the early period, i.e., the first 14 days after the stroke (if the patient's condition permits). Without surgery, the risk of re-bleeding reaches 5% per year. There are two main methods for surgical exclusion of aneurysms:
- Open (traditional): involves performing a craniotomy followed by placing a special clip directly on the neck of the aneurysm.
- Endovascular (intravascular): a minimally invasive technique in which special thrombogenic materials are inserted into the aneurysm cavity via a catheter.
Treatment of cerebral venous sinus thrombosis
Acute impairment of venous outflow requires a fundamentally different therapeutic approach. The cornerstone of treatment, which has radically improved patient survival, is anticoagulant therapy (administration of heparin preparations).
Here, there is a critically important rule: the administration of heparin is mandatory even in the presence of an intraparenchymal venous hemorrhage, provided it is reliably confirmed that it occurred precisely as a consequence of venous sinus thrombosis. Precise differential diagnosis of the hemorrhage etiology is vital, since anticoagulators are strictly contraindicated in intracerebral hemorrhages of other origins. The mechanism of action of anticoagulants in venous occlusion is that they halt the growth of thrombotic masses, stimulate the opening of collateral venous pathways, and restore microcirculation.
The standard treatment regimen includes:
- Acute phase: intravenous administration of heparin.
- Further management: gradual transition to oral anticoagulants for up to 6 months. If the patient has a tendency toward hypercoagulation, treatment is continued lifelong.
It is important to note that the use of fibrinolytics in cerebral venous thrombosis has proven ineffective, and open surgical removal of the venous hemorrhagic infarction is considered inappropriate.
Management of intracerebral hemorrhages
Nontraumatic intracerebral hemorrhages are most commonly caused by uncontrolled arterial hypertension. The resulting hematoma acts as an intracranial space-occupying lesion, physically displacing surrounding structures (mass effect) and causing a rapid increase in intracranial pressure (ICP).
The primary objective of the attending physician is to maximally preserve viable brain tissue within and around the lesion. To achieve this, it is necessary to actively combat intracranial hypertension. The decision on neurosurgical evacuation of the hematoma is made strictly on an individual basis, taking into account the patient's age as well as the exact location and volume of the hemorrhage:
- For volumes greater than 20 cm³: surgical removal of the clot is considered clinically justified.
- Small hematomas: open surgery is not recommended. The bulk of healthy tissue inevitably destroyed during the surgical approach significantly exceeds the volume of parenchyma the surgeon can save.
- Deep localization (e.g., in the basal ganglia or thalamus): accessing such areas is associated with critical damage to overlying structures, making the surgical risk unacceptable.
- Extremely large hemorrhages (greater than 60 cm³): the prognosis remains poor regardless of the tactic, since the hemorrhage itself initially destroys too large an area of the brain.
In situations where a small hemorrhage or blood breakthrough into the ventricles is complicated by the development of acute hydrocephalus, intervention should reasonably be limited to external ventricular drainage. This method effectively reduces pressure without extensive parenchymal trauma. In chronic venous outflow disorders with persistent elevation of CSF pressure, permanent shunting methods (lumboperitoneal or ventriculoperitoneal) are used.
Briefly: answers to topical questions
What are the indications for surgical removal of an intracerebral hematoma?
Indications for surgical removal of an intracerebral hematoma include large, surgically accessible hematomas causing displacement of brain structures.
Vital-indication surgical interventions are performed in the following cases:
- Cerebellar hematomas — volume greater than 15 cm³, which is associated with a high risk of brainstem compression and the development of obstructive hydrocephalus.
- Hemispheric hematomas — subcortical and putaminal hematomas with depression of consciousness to deep confusion or stupor (9–12 points on the Glasgow Coma Scale), which is associated with the development of herniation syndrome.
- Hemorrhage from a subtentorial AVM — in the presence of an intracerebral cerebellar hematoma with a volume greater than 15 ml, emergency surgery is indicated.
What scales exist to assess the severity of a patient's condition in subarachnoid hemorrhage?
To assess the severity of a patient's condition in subarachnoid hemorrhage, the literature specifies:
- WFNS scale (World Federation of Neurological Surgeons Subarachnoid Hemorrhage Grading) — intended for assessing the severity of patients with SAH; includes evaluation using the Glasgow Coma Scale and the presence or absence of gross neurological deficit.
- Hunt-Hess scale — the source mentions grades I, II, and III of condition severity according to this scale in SAH.
- Classifications of SAH and IVH, presented as a comparison of subarachnoid hemorrhage grading scales, presumably the Fisher scale and the modified Fisher scale.
What are the target blood pressure values in the hyperacute period of intracerebral hemorrhage?
The source indicates that blood pressure control in intracerebral hemorrhage aims to reduce the final hematoma volume. Lowering blood pressure within the first 6 hours from symptom onset reduces the risk of hematoma expansion.
Tactics depend on the initial level of systolic blood pressure:
- at SBP greater than 220 mm Hg, more active blood pressure reduction is justified.
Class and exam questions
Is it permissible to use heparin if a patient with cerebral venous sinus thrombosis has already experienced a hemorrhage?
Yes, in confirmed cerebral venous sinus thrombosis, anticoagulants are administered even in the presence of intraparenchymal hemorrhage. They are necessary to stop thrombus formation and open collaterals; however, in hemorrhages of other etiologies, they are strictly contraindicated.
Why are small intracerebral hematomas not operated on?
Removal of small hematomas requires a surgical approach that inevitably traumatizes a significant volume of healthy nervous tissue. The damage from the intervention itself in such cases outweighs the potential benefit.
How to manage intracranial hypertension in hydrocephalus caused by SAH or hematoma?
When hydrocephalus develops against the background of hemorrhage, it is advisable to perform external ventricular drainage, which allows for rapid pressure reduction without significant parenchymal damage.
What else to study on this topic
- Typical locations of cerebral artery saccular aneurysms
- Specifics of MRI and CT in the diagnosis of cerebral venous thrombosis
- Pathogenesis and complications of intracranial hypertension in hemorrhages
- Differential diagnosis of idiopathic intracranial hypertension
- Causes of intracerebral hemorrhages not associated with hypertension (AVMs, cavernomas, vasculitis)
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