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Hemianopia:  Loss of vision to one part of the visual field.  This can lead to trouble seeing on one side of the body.

Hemiparesis:  Weakness on one side of the body due to a stroke.  The degree of weakness can vary from mild, moderate to severe.  This may also be associated with changes in feeling, numbness or tingling.

Hemiplegia:  Complete loss of movement on one side of body due to a stroke.  Sometimes referred to as a complete paralysis.

Hemorrhagic stroke:  A stroke caused by the rupture of an artery within the brain.

·        Intracerebral hemorrhage occurs when a diseased blood vessel within the brain bursts, allowing blood  to leak inside the brain.  The name means within the cerebrum or brain.

·        Subarachnoid hemorrhage occurs when a blood vessel ruptures and blood fills the subarachnoid        space surrounding the brain (the space between the thin tissues that the surround the brain).  Symptoms  may include a sudden, intense headache, neck pain, and nausea or vomiting.

Holter monitor:  A portable device worn around the neck and shoulders that records the electrical activity of the heart.  A holter monitor is similar to an electrocardiogram but allows the information to be recorded over longer periods of time (24-48 hours) either in hospital or at home

Hyperacute period:  Time frame between initial onset of stroke symptoms and contact with paramedics and emergency departments.

Hyperlipidemia:  Also known as high cholesterol.  A condition where there is high levels of lipids (or fats) in the blood.  It can be due to family history and/or the types of food a person eats.  

Hypertension:  Also known as high blood pressure.  Blood pressure is high when it is 140 ⁄ 90 or above on repeated readings.  High blood pressure is the number one risk factor for stroke.