Exercise-induced asthma is a condition of respiratory difficulty (bronchoconstriction) that is related to histamine release,is triggered by aerobic exercise, and lasts several minutes. Causes include medical conditions, environmental factors, and medications. The image below illustrates the pathogenesis of asthma.
A myelogram is an invasive diagnostic test that uses x-rays to examine the spinal canal. A special dye is injected into the spinal canal through a hollow needle. An x-ray fluoroscope then records the images formed by the dye. Myelograms can show conditions affecting the spinal cord and nerves within the spinal canal.
1 A myelogram is a procedure where special non-ionic contrast material (dye) is placed in the spinal canal in order to view the spinal canal, spinal cord and the spinal nerve roots.2  A myelogram also views the spine's vertebrae and disks as well as other parts of the spine's anatomy. A myelogram is a procedure where special non-ionic contrast material (dye) is placed in the spinal canal in order to view the spinal canal, spinal cord and the spinal nerve roots.