What is a Subarachnoid Hemorrhage?

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Definition of Subarachnoid Hemorrhage:

Subarachnoid hemorrhage is a life-threatening diagnosis.

Subarachnoid hemorrhage most often occurs following acute head trauma. Other precedents are intracranial aneurysm and intracranial A-V malformations.

Risk is increased by high blood pressure, anticoagulant use, and a family history of cerebrovascular accident. Thirty-five percent of patients will die within 1 week of the initial bleed. Twenty percent of patients will present with a "warning bleed" such as this patient. Warning bleeds are repeat small bleeds through areas of arterial bifurcations that may be weakened by arteriosclerosis.

Warning bleeds are predictive of an aneurysm rupture within 3 months. They cause sudden acute headaches during the initial vascular failure and meningeal irritation leading to pain and stiffness with cervical flexion during the blood resorption phase.

Additional Reading:

Basic Neurology

1. Peripheral Nervous System
2. Central Nervous System
3. The Ventricular System
4. The Spinal Cord
5. The Brain Stem
6. The Cerebellum
7. Visual Pathways
8. Diencephalon
9. Basal Ganglia
10. Cerebral Cortex
11. Sleep Disorders
12. Autonomic Nervous System
13. Cranial Nerves and Parasympathetic Ganglia
14. Cells of the Nervous System
15. Cerebrospinal fluid
16. Additional short notes on Cerebrum
17. Functions and Diseases of Cerebrum
18. Subcortical Grey Matter
19. Notes on The Spinal Cord
20. Regulation of Heart Rate by Autonomic Nervous System
21. Action Potentials, Axon Conduction, and Neuromuscular Junction
22. Types of Seizures
23. What is a Cough Reflex?
24. Notes on Congenital Prosopagnosia
25. Findings in Parkinson's Disease
26. Types of Heat Strokes
27. Types of Strokes
28. What is Benign Intracranial Hypertension?
29. What is Cauda Equina Syndrome?
30. Cranial Nerve Locations in Brain Stem
31. What is a Cluster Headache?
32. What is a Subarachnoid Hemorrhage?
33. What is a Tension Headache?

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