If the virus becomes active after being latent, it causes the disorder known as shingles, or herpes zoster. The virus spreads in the ganglion and to the nerves connecting to it. Nerves most often affected are those in the face or the trunk. The virus can also spread to the spinal cord and into the bloodstream.
About this Procedure. The sniff test is a fluoroscopic exam used to check how the diaphragm (the muscle that controls breathing) moves during activities such as breathing normally and inhaling rapidly. Your diaphragm normally moves down when you inhale, and up when you exhale.
The sniff test is a fluoroscopic exam used to check how the. diaphragm (the muscle that controls breathing) moves during. activities such as breathing normally and inhaling rapidly. Your diaphragm normally moves down when you inhale, and up. when you exhale. Both the right and left sides of your diaphragm. should move in the right direction at the same time. During the sniff test, the radiologist will observe how your diaphragm. moves. You will be asked to sniff or quickly breathe in through. your nose. An injury or abnormality resulting in paralysis of the. phrenic nerve (the nerve responsible for diaphragmatic motion) can. be detected in this manner.