What is Bifrontal index?
1): 1. The bifrontal index is the distance between the anterior cor- ners of the frontal horns (A) relative to the width of the cerebral hemisphere at the same level (A,).
What is Evan’s index?
The Evans index (EI) is defined as the ratio of the maximal width of the frontal horns to the maximum inner skull diameter. First proposed by Evans in 1942, it has been used to indirectly assess the expansion of the ventricular system in encephalography (Evans, 1942).
How to measure evan’s index?
The Evans index is determined by the largest diameter of the frontal horns divided by the diameter of the internal skull, on the same plane. A value greater than 0.3 for the Evans index is the only essential morphologic criterion of probable INPH as reported in the journal Neurosurgery and ‘ the Japanese guidelines ‘ .
How is CT hydrocephalus measured?
CT/MRI criteria for acute hydrocephalus include the following:
- Size of both temporal horns is greater than 2 mm, clearly visible.
- Ratio of the largest width of the frontal horns to maximal biparietal diameter (ie, Evans ratio) is greater than 30% in hydrocephalus.
What is Bifrontal diameter?
Measurement of bifrontal diameter: The maximum bifrontal diameter is the transverse distance defined by a line connecting two anterior corners of the frontal horns a and b (Fig. 1).
What is the normal size of brain ventricles in adults?
Normal sizes of the ventricles on CT and MRI shows the 3V to be <5 mm in children, <7 mm in adults <60 years of age and <9 mm in adults above 60 years.
What is normal pressure hydrocephalus?
Normal pressure hydrocephalus (NPH) is a brain disorder in which excess cerebrospinal fluid (CSF) accumulates in the brain’s ventricles, causing thinking and reasoning problems, difficulty walking, and loss of bladder control.
Can hydrocephalus be seen on CT scan?
CT scans and MRI scans are often used in combination to confirm a diagnosis of hydrocephalus present from birth (congenital) and hydrocephalus that develops later in children and adults (acquired). These scan the brain in detail.
How do you measure Bifrontal diameter?
The maximum bifrontal diameter is the transverse distance defined by a line connecting two anterior corners of the frontal horns ‘a’ and ‘b’. The brain width or bihemispheric diameter is the distance measured along the line of bifrontal diameter to the brain edge ‘c’ and ‘d’.
What are Hickman lumens and how are they used?
The lumens are short, small tubes with caps at the end. The lumens are used to give medications or draw blood. When your provider uses these lumens it is sometimes called “accessing the Hickman line”. Once insertion of your Hickman line is done, an X-Ray will be taken to make sure your Hickman line is in the right place.
What is a Hickman catheter?
A Hickman is a central line catheter that is placed on the right side of your chest wall. A Hickman line is a soft, small, long, hollow tube that is placed into a vein in the chest and ends in a larger vein just above your heart.
What are the risks of using a Hickman device?
However, there is the risk of air embolism, phlebitis, blood clot, nerve irritation and injury and irritation to the heart muscles resulting in arrhythmia. Other issues may arise after placement, while the Hickman is in use.
