Atrial fibrillation is a cardiac arrhythmia that involves the two upper chambers of the heart. It can often be identified by taking a pulse and observing that the heartbeats don't occur at regular intervals, but a conclusive indication of AF is the absence of P waves on an electrocardiogram ....
ATRIA (Alpha Trianguli Australis). Among the easiest constellations to invent are simple triangles. There are two of them, one north (Triangulum) and one far south (Triangulum Australe).
Atria is an orangish K2IIb-IIIa subgiant to giant. The Visual Magnitude and distance imply a luminosity about 2000 times that of the sun.
Other Designations For This Star
Alpha Trianguli Australis
Greek/English: combination of alpha and triangle ...
Mothallah; Atria; Caput Trianguli; Ras al Muthallah; Elmuthalleth.
HD 11443 ...
The main named stars in this image (Greek alphabet)
Acrux (α Cru), Atria (α TrA), Gacrux (γ Cru), Hadar (Agena, β Cen), Miaplacidus (β Car), Mimosa (Becrux, β Cru), Rigil Kentaurus (Toliman, α Cen), Scutulum (or Aspidiske, ι Car).
Catheter Ablation for Atrial...
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The brightest star in the constellation is  alpha Trianguli Australis, also known as Atria, which is just a contraction of its designation. It is an orange bright giant 415 light-years distant and a suspected binary star.
It was introduced by Keyser and de Houtman at the end of the 16th century. Its brightest star, Atria, is mag. 1.9. The constellation's brightest deep-sky object is NGC 6025, an open cluster of about 60 stars fainter than 7th magnitude.
The three main stars of Triangulum Australe are brighter than those of their northern counterpart, although the constellation is smaller. Navigators have named its brightest star Atria, a contraction of its scientific name Alpha Trianguli Australis.
Net Sge Sagitta Arrow Sgr Sagittarius Archer Rubkat Sco Scorpius Scorpion Antares Scl Sculptor Sculptor's Apparatus Sct Scutum Shield Ser Serpens Serpens Unuk Sex Sextans Sextant Tau Taurus Bull Aldebaran Tel Telescopium Telescope TrA Triangulum Australis Southern Triangle Ras al Muthallath (Atria) ...
See also: What is the meaning of Triangulum, Constellation, Triangulum Australe, Star, Taurus?