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. variation from the normal rhythm, especially of the heartbeat. See also bradycardia, tachycardia. atrial arrhythmia. see atrial flutter, atrial fibrillation. bradycardic arrhythmia. see bradyarrhythmia. benign arrhythmia. one which is clinically insignificant.