Haemorrhagic stroke – Diagnostics – Overview of Information and Clinical Research

Diagnosing a haemorrhagic stroke quickly and accurately can mean the difference between life and death. When a blood vessel in the brain bursts and causes bleeding, every minute counts. Understanding how doctors identify this serious condition—and what tests may be needed before, during, and after emergency treatment—helps patients and families know what to expect during a frightening and uncertain time.

Understanding When Diagnostic Testing Is Needed

Anyone experiencing sudden stroke symptoms should seek emergency medical attention immediately by calling 911. Time is absolutely critical because haemorrhagic stroke occurs when a blood vessel in the brain ruptures and bleeds, causing rapid damage to brain cells. The bleeding not only deprives parts of the brain of oxygen and nutrients, but also creates dangerous pressure inside the skull that can kill or permanently damage brain tissue within minutes.^[1]

People who should seek immediate diagnostic evaluation include those experiencing sudden severe headache—often described as the worst headache of their life, like being hit on the head—along with other warning signs. These signs can be remembered using the acronym BE FAST: Balance problems, Eye changes or vision loss, Face drooping on one side, Arm weakness or drift, Speech difficulties, and Time to call for help immediately.^[1] Additional symptoms that warrant urgent assessment include sudden confusion, dizziness, numbness or weakness on one side of the body, neck stiffness, nausea and vomiting, seizures, or loss of consciousness.^[4]

Family members or bystanders play a crucial role in recognizing stroke symptoms, as the person experiencing the stroke may be too confused or unconscious to call for help themselves. If someone experiences a sudden, intense headache that goes away on its own or with painkillers, they should still call 911, as this could indicate a serious problem that needs immediate evaluation.^[6]

⚠️ Important

Even if stroke symptoms are temporary and last only a few minutes or hours—a condition called transient ischemic attack or TIA—emergency evaluation is essential. These temporary symptoms are often warning signs that a person has a very high risk of having a full stroke soon. The risk of a major stroke increases dramatically in the days and weeks following a TIA, so immediate diagnostic testing is needed to understand why the symptoms occurred and how to prevent a future stroke.^[1]

In some cases, people may need diagnostic screening even without symptoms. Those at higher risk for haemorrhagic stroke include individuals with chronically high blood pressure, those taking blood-thinning medications, people with known brain aneurysms or abnormal blood vessel formations, individuals with certain bleeding disorders, and older adults, particularly those over 65 years of age.^[4] Doctors may recommend preventive imaging or monitoring for people with these risk factors to detect problems before they cause a stroke.

Classic Diagnostic Methods for Haemorrhagic Stroke

When a patient arrives at the emergency department with suspected stroke symptoms, doctors work rapidly to determine what type of stroke has occurred. This distinction is critical because treatment for haemorrhagic stroke differs completely from treatment for ischemic stroke, which is caused by a blocked blood vessel rather than bleeding. Using the wrong treatment could be fatal, so accurate diagnosis must happen as quickly as possible.^[10]

Initial Assessment and Medical History

The diagnostic process begins immediately upon arrival at the hospital. Healthcare providers perform a thorough physical examination and gather as much medical history as possible. Because haemorrhagic stroke can cause confusion, sleepiness, or unconsciousness, family members or companions may need to provide information about the patient’s medical background. Doctors will ask about pre-existing conditions like high blood pressure or bleeding disorders, whether the patient takes blood-thinning medications, and exactly when symptoms began.^[4]

Knowing the precise time when symptoms started is particularly important because it helps doctors determine which treatments are safest and most effective. Healthcare providers will also ask about recent head injuries, drug use, smoking habits, and alcohol consumption, as these factors can contribute to haemorrhagic stroke.^[4]

Brain Imaging: The Primary Diagnostic Tool

A computed tomography scan, commonly called a CT scan, is the first and most important diagnostic test performed when haemorrhagic stroke is suspected. This imaging test is the initial investigation of choice because it can rapidly and accurately show whether bleeding has occurred in the brain.^[10] During a CT scan, an X-ray machine moves around the patient’s head, taking multiple images from different angles. A computer then combines these images to create detailed cross-sectional pictures of the brain.

The CT scan can reveal not only whether bleeding is present, but also where the bleeding is located, how large the bleed is, and whether it is putting dangerous pressure on brain tissue. The scan can distinguish between the two main types of haemorrhagic stroke: intracerebral haemorrhage, where blood leaks directly into brain tissue, and subarachnoid haemorrhage, where blood leaks into the space between the brain and its protective covering.^[10]

Magnetic resonance imaging, or MRI, is another powerful imaging technique that uses magnets and radio waves instead of X-rays to create detailed pictures of the brain. MRI scans can sometimes detect small bleeds or early damage that might not show up clearly on a CT scan. However, MRI takes longer to perform than CT, which is why CT is typically used first in emergency situations when speed is critical.^[5]

Additional Diagnostic Tests

Beyond brain imaging, doctors use several other tests to understand the full picture of what has happened and what might have caused the stroke. An electrocardiogram (ECG or EKG) records the electrical activity of the heart to check whether heart problems might have contributed to the stroke or been affected by it.^[5]

Blood tests are essential to check multiple factors. Doctors will test blood glucose levels, as both very high and very low blood sugar can mimic stroke symptoms. They will also check how quickly the patient’s blood clots, which is especially important if the patient takes blood-thinning medications. Blood counts help identify problems like low platelet levels that could affect bleeding. Additional blood tests may check kidney and liver function, electrolyte balances, and markers of infection or inflammation.^[5]

Sometimes doctors perform a lumbar puncture, also called a spinal tap, to confirm the diagnosis of subarachnoid haemorrhage. During this procedure, a thin needle is inserted into the lower back to collect a small sample of the fluid that surrounds the brain and spinal cord. If blood is present in this fluid, it confirms bleeding around the brain. This test is particularly useful when a subarachnoid haemorrhage is strongly suspected but doesn’t show up clearly on initial imaging.^[5]

An electroencephalogram (EEG) may be ordered if doctors suspect the patient is having seizures, which can occur in people with haemorrhagic stroke. The EEG measures electrical activity in the brain using small sensors placed on the scalp. It can detect seizure activity even when it doesn’t cause visible convulsions.^[5]

Specialized Imaging to Find the Source of Bleeding

Once doctors confirm that a haemorrhagic stroke has occurred, they need to identify what caused the bleeding so they can prevent it from happening again. Several specialized imaging techniques help pinpoint the source of the problem.

Angiography is a detailed imaging test that examines blood vessels in the brain. During this procedure, doctors insert a thin tube called a catheter into an artery, usually in the groin, and carefully thread it up to the blood vessels in the brain. They then inject a special dye that shows up on X-ray images, creating detailed pictures of the blood vessels. This test can reveal aneurysms—weak, bulging spots in blood vessel walls that can burst—as well as abnormal tangles of blood vessels called arteriovenous malformations or AVMs.^[4]

CT angiography and MR angiography are less invasive alternatives that combine standard brain imaging with the injection of contrast dye through a vein rather than requiring a catheter in the arteries. These techniques can often provide similar information with less risk and discomfort for the patient.

Diagnostic Tests Used for Clinical Trial Qualification

When patients with haemorrhagic stroke are considered for participation in clinical trials testing new treatments, they must undergo standardized diagnostic testing to determine whether they meet the study’s entry requirements. These qualification criteria ensure that research studies include appropriate patients and produce reliable, meaningful results.

Clinical trials typically require confirmed diagnosis through brain imaging, most commonly a CT scan, showing the presence, location, and size of the bleeding. The timing of the stroke is crucial—many trials only accept patients within a specific time window, such as within 24 hours of symptom onset. Accurate documentation of when symptoms began is therefore essential for trial qualification.

Researchers use specific criteria to measure the severity of the stroke. The Glasgow Coma Scale or similar tools assess the patient’s level of consciousness and neurological function. Blood pressure measurements must fall within certain ranges, as extremely high or low blood pressure may exclude patients from certain studies. Laboratory tests verify that blood clotting factors, kidney function, liver function, and blood cell counts meet study requirements.^[11]

Additional imaging may be required to exclude patients with certain complications or to identify specific subtypes of haemorrhagic stroke. For example, some trials focus specifically on patients with bleeding caused by high blood pressure rather than aneurysms or other structural problems. Advanced imaging techniques may be used to measure the volume of bleeding precisely or to assess blood flow in surrounding brain tissue.

Patients taking certain medications, such as blood thinners, may need specialized blood tests to measure drug levels or their effects on clotting. This information helps researchers understand whether the medication might affect how well the experimental treatment works or increase the risk of complications during the study.

Before enrolling in any clinical trial, patients should understand that they will likely need to undergo additional diagnostic tests beyond those performed during standard emergency care. These tests help ensure patient safety and scientific accuracy but may involve some additional discomfort or risk. Healthcare providers should explain all testing procedures and answer questions about why each test is necessary and what information it provides.

Prognosis and Survival Rate

Prognosis

Haemorrhagic stroke is associated with severe complications and serious long-term health problems. The prognosis—meaning the likely outcome and course of recovery—depends on multiple factors including how quickly treatment begins, the size and location of the bleeding, the patient’s age and overall health, and whether complications develop.^[10]

Progression of haemorrhagic stroke is associated with worse outcomes. The bleeding can expand rapidly in the hours after the initial rupture, causing sudden deterioration in consciousness and brain function. This is why early diagnosis and treatment are so essential—the usual rapid expansion of bleeding causes additional brain damage that makes recovery more difficult.^[10]

Survivors of haemorrhagic stroke are much more likely to experience long-term disability compared to people who have ischemic strokes. The severity of disability varies widely depending on which parts of the brain were damaged. People may face challenges with movement and mobility, speech and communication, cognitive function including memory and problem-solving, vision and hearing, and emotional regulation. Many stroke survivors require ongoing rehabilitation and support to regain as much function as possible.^[21]

Survival rate

Haemorrhagic strokes are particularly dangerous and life-threatening. They account for approximately 10 to 15 percent of all strokes, but they are often more deadly than ischemic strokes.^[4] Without fast medical attention, these strokes often cause permanent brain damage and can be fatal. About half of ruptured aneurysms, which are a common cause of subarachnoid haemorrhage, can lead to death.^[8]

The hemorrhage can occur suddenly and may result in death, especially when a large aneurysm is the cause. However, with prompt medical attention and dedicated rehabilitation, many people who experience a haemorrhagic stroke can regain a significant amount of function and see improvement in their quality of life.^[21] The sooner someone is diagnosed and treated, the more likely it is they will survive a stroke—every second truly counts.^[1]

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