With the first ribs fixed by neck muscles (scalene muscles and sternocleidomastoid muscle), the intercostals muscles (especially external intercostal muscles and interchondral part of internal intercostal muscles of opposite side), elevate the 2nd to 12th ribs and thus act as inspiratory muscles.
Medical Dictionary. arrhythmia. play. noun arÂ·rhythÂ·mia \Ä-Ërith-mÄ-É\. Medical Definition of arrhythmia. : an alteration in rhythm of the heartbeat either in time or force.
Arrhythmia. an abnormal cardiac rhythm. one cause can be from heart block-the failure of any part of the conduction system to transmit signals, usually as a result of disease and degeneration of conduction system fibers. for ex. bundle branch block is due to damage to one or both bundle branches.