Heart block typically causes lightheadedness, fainting, and palpitations. Depending on the severity of the heart block, this can be dangerous. For example, a third-degree heart block can worsen pre-existing conditions, such as heart failure. It can cause loss of consciousness and even sudden cardiac arrest. There can also be chest pain.
Sacral vertebrae: There are 5 sacral vertebral bones. They are represented by the symbols S1 through S5 and are situated between the lumbar vertebrae and the coccyx (the lowest segment of the vertebral column).The sacral vertebrae are normally fused to form the sacrum.hey are represented by the symbols S1 through S5 and are situated between the lumbar vertebrae and the coccyx (the lowest segment of the vertebral column).
The sacrum is a triangular or shield-shaped bone at the caudal end of the spine comprising 5 vertebral segments. Denis et al divided the sacrum into 3 zones (Fig 1). Zone 1 is composed of the sacral ala and bone between the sacroiliac joints and the neural foramina and is the most common site of SIFs. Zone 2 contains the neural foramina, and Zone 3, the sacral bodies.