
1) Heart disease
Found on
https://www.crosswordclues.com/clue/atrial-flutter

Atrial flutter (AFL) is an abnormal heart rhythm that occurs in the atria of the heart. When it first occurs, it is usually associated with a fast heart rate or tachycardia (beats over 100 per minute), and falls into the category of supra-ventricular tachycardias. While this rhythm occurs most often in individuals with cardiovascular disease (e.g....
Found on
http://en.wikipedia.org/wiki/Atrial_flutter

(from the article `cardiovascular disease`) Atrial flutter (rapid atrial beat) may occur suddenly and unpredictably or may be a chronic sustained arrhythmia. The heart rate in atrial flutter ...
Found on
http://www.britannica.com/eb/a-z/a/121

<cardiology> A rapid well organised contraction of the atrium at a rate of 250-350 contractions per minute. ... Ventricular response rates are usually some multiple of 300. ECG shows sawtooth waves. Atrial flutter is considered a serious and potentially unstable rhythm. ... (27 Sep 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

a cardiac arrhythmia in which the atrial contractions are rapid (230–380 per minute), but regular. Two types, I and II, are distinguished according to rate; Type I is also more amenable to cardioversion. In Type I the atrial rate is usually 290 to 310 per minute but can range from 230 to 350. In Type II the atrial rate is...
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Definitions: 1. rapid regular atrial contractions occurring usually at rates between 250 and 330 per minute (Type I atrial flutter) and often producing 'sawtooth' waves in the electrocardiogram, particularly leads II, III, and aVF. Type II atrial flutter is at rates of 330-450 per minute. Unlike Type I, it cannot be terminated by overdri...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=34189

Atrial flutter: Well-organized but overly rapid contractions of the atrium of the heart (usually at a rate of 250-350 contractions per minute). Flutter refers to a rapid vibration or pulsation. The difference between flutter and fibrillation is that flutter is well organized while fibrillation is not. Atrial flutter is a serious and potentially uns...
Found on
http://www.medterms.com/script/main/art.asp?articlekey=9739

an irregular heartbeat in which the upper chambers of the heart (the atria) beat rapidly but consistently
Found on
https://www.encyclo.co.uk/local/20875

a very fast beating of the atria (the upper two chambers of the heart).
Found on
https://www.stanfordchildrens.org/en/topic/default?id=glossary---cardiovasc

A type of arrhythmia in which the upper chambers of the heart (the atria) beat very fast, causing the walls of the lower chambers (the ventricles) to beat inefficiently as well.
Found on
https://www.texasheart.org/heart-health/heart-information-center/topics/a-z
No exact match found.