EMERGENCY:The worst headache of your life — coming on suddenly, within seconds — is a medical emergency —call040-46324365immediately — 24 hours, 7 days— 24/7
Subarachnoid Hemorrhage: When the Worst Headache of Your Life Means a Brain Emergency
Subarachnoid hemorrhage is a life threatening type of stroke caused by bleeding into the space surrounding the brain most often due to rupture of a cerebral aneurysm. It typically presents with a sudden severe headache often described as the worst headache of life sometimes accompanied by vomiting loss of consciousness or seizures. At KIMS Neuroscience Hyderabad emergency evaluation with CT scan and CT angiography is performed within minutes followed by urgent neurocritical care and definitive treatment such as aneurysm coiling or surgical clipping available 24 hours a day.
Bleeding into the space surrounding the brain usually from a ruptured aneurysm
Ruptured brain aneurysm 80 to 85 percent of cases
Thunderclap headache the worst headache of my life reaching maximum intensity within seconds
YES the most time critical emergency in neurosurgery
Surgical aneurysm clipping Endovascular aneurysm coiling
Aneurysm secured within 24 hours whenever possible rebleeding before treatment is often fatal
04046324365
Subarachnoid haemorrhage (SAH) is bleeding into the subarachnoid space — the fluid-filled space surrounding the brain — most commonly (80–85% of cases) from rupture of a cerebral aneurysm. The hallmark is the thunderclap headache: the worst headache of a person's life, reaching maximum intensity within seconds. SAH is one of the most immediately life-threatening neurological events. Rebleeding before the aneurysm is secured carries 70–80% mortality. At KIMS Neuroscience Hyderabad, emergency clipping and coiling are available 24/7 with a target of aneurysm securement within 24 hours of diagnosis.
- The cardinal warning
- The worst headache of your life — reaching maximum intensity within seconds. This is the thunderclap headache. It is caused by blood suddenly entering the space around the brain. Call 040-46324365 immediately.
- The sentinel headache
- 43% of SAH events are preceded by a smaller warning headache that partially resolves. If a thunderclap-type headache resolved over 24–48 hours, seek urgent CT + LP assessment. This may be the one chance to treat the aneurysm before full rupture.
- Rebleed risk
- Rebleeding before the aneurysm is secured carries 70–80% mortality. Every hour before treatment is secured is an hour of risk. KIMS targets aneurysm securement within 24 hours.
- Two treatments
- Surgical clipping (titanium clip across aneurysm neck · immediate, permanent, durable) · Endovascular coiling (catheter-based · no incision · higher recanalisation rate). Both available at KIMS. Choice based on aneurysm anatomy.
- Vasospasm (days 4–14)
- After aneurysm is secured, brain arteries can go into vasospasm causing delayed strokes. Monitored with daily TCD at KIMS. Prevented with nimodipine (21 days). Treated with hypertensive therapy or angioplasty.
- Recovery expectation
- ~30% die from initial bleed or early complications · ~50% of survivors make good functional recovery · Fatigue, memory problems, anxiety common even after good recovery.
- Emergency
- 040-46324365 immediately · 24/7 · Clipping and coiling both available
| Fact | Details |
|---|---|
| Cause | Ruptured cerebral aneurysm (80–85%) · AVM · Perimesencephalic non-aneurysmal SAH (benign variant) |
| Cardinal sign | Thunderclap headache — worst headache of life — reaching maximum intensity within seconds |
| Sentinel headache | Present before 43% of SAH events · Warning leak from aneurysm that resolves · Greatest opportunity for pre-rupture intervention |
| Rebleed risk | 70–80% mortality if aneurysm rebleeds before treatment · KIMS targets securement within 24 hours |
| KIMS capability | Clipping + coiling + flow diversion · Intraoperative ICG angiography · Robotic guidance |
| Key complications | Rebleeding (days 1–3) · Vasospasm (days 4–14) · Hydrocephalus (EVD or VP shunt) · Hyponatraemia · Cardiac complications |
| Vasospasm prevention | Nimodipine (21 days) for all SAH patients · Daily TCD monitoring · Hypertensive therapy for DCI · Interventional angioplasty available |
About This Condition
The Headache You Must Never Ignore
Every year, people across Hyderabad and India experience a headache that is unlike anything they have felt before. It comes on suddenly sometimes described as an explosion inside the head sometimes as a thunderclap. It reaches its absolute maximum intensity within seconds. It is not the worst headache they have had in recent weeks. It is the worst headache of their entire life.
Many of these people take a painkiller and lie down. Some wait hoping it passes. Some are told by a doctor or family member that it is a migraine.
In a significant proportion of these people the headache is subarachnoid haemorrhage bleeding into the space around the brain from a ruptured aneurysm. And the next few hours will determine whether they survive whether they recover or whether the rebleed which can happen at any moment before the aneurysm is secured kills them.
Subarachnoid haemorrhage SAH is not the most common type of stroke. But it is the most immediately life threatening neurological event that a person can experience and survive long enough to seek help. The outcome is determined by two things above all others how quickly the diagnosis is made and how quickly the aneurysm is treated.
At KIMS Neuroscience Secunderabad Hyderabad the SAH protocol activates the moment a patient presents with a thunderclap headache. CT imaging is performed within minutes. If SAH is confirmed the KIMS Neuroscience team leads the immediate multidisciplinary response angiography treatment planning and aneurysm securement within 24 hours wherever possible.
The emergency number is 04046324365. It is answered 24 hours a day.
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A sudden severe headache can be a brain emergency. Do not delay evaluation.
040-44885000International enquiries: neuroscience@kimshospitals.comWhat Is Subarachnoid Haemorrhage?
The brain sits inside the skull surrounded by three layers of protective membrane the meninges. Between two of these layers the arachnoid and the pia mater is the subarachnoid space, which contains cerebrospinal fluid (CSF), the clear fluid that cushions the brain.
In subarachnoid haemorrhage, blood enters this subarachnoid space spreading rapidly around the brain, irritating its surface, raising the pressure inside the skull, and disrupting the blood supply to the entire brain. Unlike intracerebral haemorrhage, where blood bleeds into the brain tissue itself, in SAH the blood pools around the outside of the brain. This distinction matters for both symptoms and treatment.
The most common cause of SAH accounting for 80–85% of spontaneous cases is the rupture of a cerebral aneurysm. An aneurysm is a ballooned, weakened bulge in the wall of a brain artery. When the wall of the aneurysm finally fails under the pressure of the circulation, it ruptures in an instant releasing blood into the subarachnoid space with an explosive rise in intracranial pressure. The severe headache is the brain's response to this sudden, massive pressure event.
Aneurysmal SAH has an overall incidence of approximately 7.9 per 100,000 people per year. It mostly affects people at a younger age, when permanent disability has a particularly substantial social and economic impact. The mean age of presentation is around 50–55 years younger than ischemic stroke and haemorrhagic stroke.
Other causes of SAH include arteriovenous malformations (AVMs), perimesencephalic non-aneurysmal SAH (a benign subtype), and, rarely, other vascular abnormalities or trauma.
The Warning Signs Including the Warning Headache
The thunderclap headache the defining presentation
The hallmark of SAH is the thunderclap headache a headache that:
• Reaches maximum intensity within seconds not minutes not hours seconds.
• It is typically described as the worst headache the person has ever experienced in their life.
• Occurs suddenly often during activity or exertion but can occur at rest.
• May be accompanied by vomiting neck stiffness sensitivity to light photophobia and brief loss of consciousness.
This headache is caused by the sudden, massive rise in intracranial pressure at the moment of rupture. It is genuinely unlike any other headache in character and patients consistently describe it in the same terms regardless of their background or prior experience of headache.
The sentinel headache the warning that is missed
Warning or sentinel headaches precede up to 43 percent of aneurysmal SAH events. A sentinel headache is a smaller warning leak from the aneurysm not the full rupture but a smaller episode of bleeding that produces a severe headache that then partially resolves. These headaches are often dismissed as migraine tension headache or stress by the patient by family and sometimes by clinicians.
The clinical tragedy: a sentinel headache is the single greatest opportunity to diagnose an aneurysm and treat it before the catastrophic full rupture. A patient who presents to KIMS with a thunderclap headache that resolved over 24 to 48 hours even if they feel well at the time of assessment receives urgent investigation. This is a potential life saving decision.
Other symptoms of SAH
• Sudden loss of consciousness or confusion at onset from the massive intracranial pressure rise
• Neck stiffness meningismus blood in the CSF irritates the meninges develops over hours
• Photophobia sensitivity to light
• Eye signs a painful dilated unresponsive pupil a posterior communicating artery aneurysm compressing the third cranial nerve is a neurosurgical emergency
• Focal neurological deficits limb weakness speech difficulty if the aneurysm is large or if vasospasm has already begun
• Seizures at onset in some patients
Diagnosis at KIMS
Diagnosis The KIMS Emergency Assessment
CT brain within minutes of arrival
Non contrast CT brain is the first test performed. In the first 24 hours CT detects blood in the subarachnoid space in approximately 95 percent of SAH cases. The characteristic appearance is bright white blood spreading along the sulci the grooves of the brain surface around the brainstem and filling the basal cisterns. The pattern of blood distribution on CT often indicates the likely site of the aneurysm.
Lumbar puncture when CT is negative
If CT is negative but the clinical suspicion remains high the patient had a thunderclap headache and symptoms are consistent with SAH a lumbar puncture LP is performed at least 12 hours after headache onset. This allows time for red blood cells in the CSF to break down and produce xanthochromia a yellow discolouration of the CSF that is the definitive test for SAH when CT is negative. A negative LP 12 or more hours after a thunderclap headache effectively excludes SAH.
CT angiography identifying the aneurysm
Once SAH is confirmed CT angiography of the cerebral arteries is performed immediately. This non invasive technique maps the circle of Willis and its branches with high resolution identifying the aneurysm its location its size its shape and its relationship to adjacent arteries. CT angiography guides the immediate treatment decision.
Digital Subtraction Angiography DSA the gold standard
Four vessel DSA a formal catheter based angiogram remains the gold standard for aneurysm characterisation. It provides the detailed roadmap needed for treatment planning the exact anatomy of the aneurysm neck the relationship to perforating arteries and confirmation of any additional unruptured aneurysms. At KIMS DSA is performed in the neurointerventional suite and the results directly guide the decision between surgical clipping and endovascular coiling.
Treatment
Treatment Securing the Aneurysm at KIMS
The single most important treatment in aneurysmal SAH is securing the ruptured aneurysm preventing it from bleeding again. Prompt evaluation identification of the aneurysmal source and treatment of the ruptured aneurysm are recommended preferably within 24 hours. The goal of treatment should be complete obliteration whenever feasible to reduce the risk of rebleeding and retreatment.
Rebleeding before aneurysm is treated carries mortality of approximately 70 to 80 percent. Every hour before treatment is secured is an hour of risk.
At KIMS Neuroscience two treatment options are available surgical clipping and endovascular coiling. The choice between them is made by the KIMS Neuroscience team and the KIMS multidisciplinary team based on the aneurysm anatomy location size and the patient clinical condition.
Treatment Option 1: Surgical Aneurysm Clipping
In microsurgical clipping the neurosurgeon opens the skull craniotomy approaches the aneurysm through the natural corridors between brain structures and places a small titanium clip across the neck of the aneurysm. The clip permanently closes off the aneurysm from the circulation it can no longer bleed. The clip remains in place for life and does not require maintenance.
When clipping is preferred:
• Young patients with good grade SAH conscious and clinically stable
• Aneurysms with wide necks that are not easily coilable
• Middle cerebral artery MCA aneurysms surgical anatomy is well suited to clipping
• Large intracerebral haematoma associated with the SAH requiring simultaneous surgical evacuation
• Cases where endovascular anatomy is unfavourable
the KIMS Neuroscience team expertise:The KIMS Neuroscience team performs aneurysm operations at KIMS microsurgical clipping of aneurysms in all locations including complex skull base and posterior circulation aneurysms.
All aneurysm surgery at KIMS is performed with intraoperative neuromonitoring intraoperative fluorescence angiography ICG and the Stealth AutoGuide robotic guidance system for trajectory precision.
Treatment Option 2: Endovascular Coiling Endovascular Aneurysm Embolisation
In endovascular coiling a microcatheter is guided from the femoral artery through the circulation to the aneurysm. Platinum coils are deposited inside the aneurysm sac packing it with material that promotes thrombosis the aneurysm clots off from the inside and can no longer receive blood flow from the parent artery.
Modern coiling techniques include flow diverter stents pipeline embolisation devices which redirect blood flow past the aneurysm rather than into it particularly useful for large or giant aneurysms and those with complex neck anatomy.
When coiling is preferred:
• Posterior circulation aneurysms basilar artery posterior communicating artery endovascular access is technically superior for these locations
• Elderly patients or those with poor neurological grade where surgical risk is higher
• Narrow necked aneurysms amenable to coiling
• Patients with multiple comorbidities making open craniotomy higher risk
The evidence:
The landmark ISAT trial demonstrated that endovascular coiling had superior short term outcomes compared to surgical clipping for aneurysms suitable for both techniques with lower rates of death or dependence at one year. However surgical clipping has higher rates of complete aneurysm obliteration and lower rates of late recanalisation and remains the preferred treatment for many aneurysm types and locations.
At KIMS the decision is made on the merits of each individual case not on institutional preference for one technique.
Managing the Complications The Critical Days After SAH
Securing the aneurysm is the beginning of treatment, not the end. The weeks after SAH are filled with life-threatening complications that require intensive, specialised Neuro ICU care.
Rebleeding the immediate threat
Before the aneurysm is secured rebleeding risk is highest in the first 24 hours. At KIMS blood pressure is carefully controlled and the aneurysm is treated as a priority. Once secured rebleeding risk drops dramatically.
Hydrocephalus the early complication
Blood in the subarachnoid space can block the drainage of cerebrospinal fluid (CSF), causing acute hydrocephalus, a dangerous rise in intracranial pressure. Approximately 20–30% of SAH patients develop acute hydrocephalus requiring external ventricular drain (EVD) insertion. Some patients develop chronic hydrocephalus weeks later, requiring a ventriculoperitoneal (VP) shunt, a permanently implanted drain that continuously diverts CSF. At KIMS, both EVD insertion and VP shunt surgery are performed as part of routine post-SAH care.
Vasospasm and delayed cerebral ischaemia
Between days 4 and 14 after SAH the second week being the highest-risk period the arteries of the brain can go into vasospasm. The arteries narrow severely, reducing blood flow to downstream brain tissue. This delayed cerebral ischaemia (DCI) can cause strokes even after the aneurysm has been successfully treated, and is responsible for a significant proportion of long-term disability in SAH survivors. Prevention and treatment of delayed cerebral ischaemia is a central pillar of post-SAH critical care, requiring standardised neurological assessments, transcranial Doppler monitoring, and advanced imaging alongside hypertensive and invasive therapies. At KIMS Neuro ICU, vasospasm is monitored with daily transcranial Doppler (TCD) ultrasound and clinical assessment. Prevention uses oral nimodipine, a calcium channel blocker with evidence-based benefit for vasospasm reduction given to all SAH patients for 21 days. When vasospasm is detected or DCI develops, hypertensive therapy (raising blood pressure to push blood through narrowed arteries) and, when necessary, interventional angioplasty or intra-arterial vasodilator infusion are employed.
Hyponatraemia the electrolyte emergency
Low sodium levels occur in approximately 30 percent of SAH patients due to a complex interaction between brain injury and hormonal responses. Severe hyponatraemia can cause seizures and worsen brain swelling. Daily electrolyte monitoring and active sodium correction are standard in the KIMS Neuro ICU.
Seizures
Seizures occur in approximately 10 percent of SAH patients and are treated with anticonvulsants. Prophylactic anticonvulsants are considered in the immediate post SAH period in high risk cases.
Cardiac complications
The massive sympathetic surge at the time of SAH can cause ECG changes arrhythmias and neurogenic pulmonary oedema mimicking a heart attack. These resolve as the acute brain injury stabilises but require cardiac monitoring throughout the Neuro ICU stay.
What Happens to the Unruptured Aneurysm Found Incidentally?
Brain aneurysms are increasingly detected incidentally found on MRI or CT scans performed for other reasons. The decision whether to treat an unruptured aneurysm is complex the risk of rupture must be weighed against the risk of treatment.
Factors favouring treatment of an unruptured aneurysm include size above 7 mm particularly above 10 mm irregular shape or multilobular morphology posterior circulation location patient age under 60 a family history of SAH and patient preference.
Factors favouring observation include very small aneurysms in asymptomatic elderly patients and significant medical comorbidities elevating surgical or procedural risk.
At KIMS Neuroscience every incidentally discovered aneurysm is assessed individually by the KIMS Neuroscience team. The risk benefit discussion is detailed unhurried and based on the specific aneurysms characteristics not on a blanket treatment protocol.
Where treatment is recommended both clipping and coiling are available and the optimal approach is selected for each patients anatomy. Detailed management of unruptured cerebral aneurysms is covered on our dedicated Cerebral Aneurysms page.
Recovery and Long Term Outcomes After SAH
SAH is a severe event with significant mortality and morbidity. Approximately 30% of SAH patients die from the initial bleed or early complications. Of survivors, approximately 50% make a good functional recovery with appropriate early treatment and Neuro ICU care. Long-term difficulties are common: fatigue, headache, memory problems, concentration difficulties, mood changes, and anxiety are reported by a significant proportion of SAH survivors even after good physical recovery.
At KIMS, rehabilitation after SAH begins within the acute admission and continues as an outpatient programme. Neuropsychological assessment identifying cognitive and emotional sequelae is part of the routine follow-up. Screening for psychological, sexual, and cognitive impairment after aneurysmal SAH can improve long-term patient quality of life.
Follow-up imaging typically MR angiography at 6 months and 2 years monitors for aneurysm recanalisation after coiling, and assesses any additional unruptured aneurysms that were detected during the acute investigation.
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FAQs
Frequently Asked Questions
EMERGENCY:sudden worst headache of your life —call040-46324365immediately — 24 hours, 7 days— 24/7
Clipping and coiling both available. Hyderabad's most experienced aneurysm team.
The KIMS Neuroscience cerebrovascular team provide the full spectrum of aneurysm care — emergency SAH treatment, surgical clipping, endovascular coiling, Neuro ICU management, vasospasm treatment, and long-term follow-up. The most comprehensive cerebrovascular centre in Telangana and Andhra Pradesh.
neuroscience@kimshospitals.com