Dictionary entry overview: What does spiny mean? â¢ SPINY (adjective) The adjective SPINY has 2 senses: 1. having spines 2. having or covered with protective barbs or quills or spines or thorns or setae etc. Familiarity information: SPINY used as an adjective is rare.
Atrial Flutter Overview. Atrial flutter is an abnormality of the heart rhythm, resulting in a rapid and sometimes irregular heartbeat. Such abnormalities, whether in the rate or regularity of the heartbeat, are known as arrhythmias. The beating of the heart is controlled by electrical impulses.
Atrial fibrillation is a very common irregular heart rhythm that causes the atria, the upper chambers of the heart, to contract abnormally. Atrial flutter. This is an arrhythmia caused by one or more rapid circuits in the atrium. Atrial flutter is usually more organized and regular than atrial fibrillation.