DNA (deoxyribonucleic acid) The molecule that carries genetic information in all living systems (see genetic code). The DNA molecule is formed in the shape of a double helix from a great number of smaller molecules (see nucleotides). The workings of the DNA molecule provide the most fundamental explanation of the laws of genetics.
Getting an epidural. Watch one mom in labor get an epidural for pain relief. The medication is usually a combination of a local anesthetic and a narcotic. Local anesthetics block sensations of pain, touch, movement, and temperature, and narcotics blunt pain without affecting your ability to move your legs.
How It Works. An epidural steroid injection (ESI) is a combination of a corticosteroid with a local anesthetic pain relief medicine. Corticosteroids are strong anti-inflammatory medicines. Relieving swelling and inflammation can take pressure off nerves and other soft tissues, which can relieve pain.n epidural steroid injection (ESI) may be tried when other nonsurgical treatments have failed to relieve severe leg pain from lumbar spinal stenosis. The corticosteroids in an ESI may help provide relief from leg pain by reducing swelling and inflammation.