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.
In atrial flutter, the heart's atria beat very fast but at a regular rate. Atrial flutter is caused by irregular circuitry within the atria. The fast rate results in weak contractions of the atria. The rapid signals entering the AV node cause a rapid and sometimes irregular ventricular rate.n atrial flutter, the heart's atria beat very fast but at a regular rate. Atrial flutter is caused by irregular circuitry within the atria. The fast rate results in weak contractions of the atria. The rapid signals entering the AV node cause a rapid and sometimes irregular ventricular rate.