1. A stroke, or cerebrovascular accident (CVA), occurs when blood flow to the brain is interrupted, causing cell death. Common symptoms include weakness, numbness, and vision issues, but not lumbar pain.
2. Atrial fibrillation (AF) is a risk factor for stroke, as it can cause blood clots to form in the heart and travel to the brain. Testing like an ECG, echocardiogram, and carotid ultrasound can help determine the cause of a CVA.
3. An initial negative CT scan does not rule out a stroke, as cell death may not be detected for up to 12 hours. An MRI or monitoring symptoms over time provides more accurate diagnosis.