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 is another term to describe an abnormal heart rhythm. This frightening heart abnormality can be caused by a number of conditions, including: Atrial Fibrillation Disorganized electrical impulses that cause the heart's two upper chambers to contract very fast and at an irregular pace. Paroxysmal Supraventricular Tachycardia