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.
An arrhythmia (also known as dysrhythmia) is any disorder of the heart rate or heart rhythm, such as beating too fast (tachycardia), too slow (bradycardia), or irregularly . Some arrhythmias are life-threatening medical emergencies that can result in cardiac arrest and sudden death.