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 large, triangular bone at the dorsal part of the pelvis, inserted like a wedge between the two hip bones. The base of the sacrum articulates with the last lumbar vertebra, and its apex articulates with the coccyx. Various muscles attach to its spinal crest. The sacrum is shorter and wider in women than in men. sacral, adj.