Contrast Radiography - Answers

Arlo Guthrie — Tue, 21 Apr 2009 07:49:30 GMT

Current Revision posted to Revision Guide For Student Nurses - Part 2 by Arlo Guthrie on 4/21/2009 7:49:30 AM

ANSWERS

What is the purpose of contrast radiography?
To allow better visualisation of structures or organs, either by altering the radio-opacity of the structure of interest or that of the surrounding tissues.
List the 3 main types of positive contrast agent and state their most common use.
- Barium sulphate - investigation of the alimentary canal.
- Water soluble iodine containing preparations - investigation of the urogenital system.
- Low osmolar non-ionic media - myelography.
What is meant by double contrast radiography?
An investigation of a hollow organ using both a positive contrast medium (used to coat the inner lining) and a negative agent (gas or air, to distend that organ).
Why are heavy sedation or general anaesthesia contraindicated in the case of a "barium swallow"?
Due to the risk of regurgitation and aspiration.
Prior to a gastrogram, the patient may be given glucagon. Why?
In order to delay gastric emptying.
List 6 conditions that may indicate the need for a barium series.
- Abdominal dilation.
- Chronic vomiting.
- Haematemesis.
- Malabsorption.
- Palpation of an abdominal mass.
- Weight loss.
Name 2 contrast agents commonly used in myelography.
- Iohexol.
- Iopamidol.
State the site for lumbar puncture.
L4-5 or L6-7.
What is angiocardiography?
A technique used to demonstrate heart disease. The heart chambers are opacified by a bolus injection of water soluble iodine containing contrast medium.
List 2 conditions in which portal venography may aid a diagnosis.
- Cirrhosis of the liver.
- Congenital portosystemic shunts.
What is the name of the contrast medium used in bronchography?
Propyliodine.
What term describes contrast radiography of a joint space?
Arthrography.