Talk:Sinus rhythm

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The article states "There are typically four distinct waves (identified by the letters P, Q, R, S, and T)", shouldn't this be five?

Apparently (http://content.cdlib.org/xtf/view?docId=ft9w1009p7&chunk.id=0&doc.view=print, and others). The history of the article also shows five in the past. So back it goes. mdf 13:39, 17 May 2007 (UTC)

[edit] What causes the waves?

• Normal Sinus Rhythm

P wave is caused by breathing.
QRS wave is caused by inhaling.
T wave is caused by constant motion.

Moved here becuase ... what on earth does this mean? Also link seems to not work kylet 10:49, 16 April 2007 (UTC)

[edit] Cardiac Rhythm Rate

Dictionary:Sinus Rhyth74.34.185.129 (talk) 02:29, 27 November 2007 (UTC)m: a cardiac rhythm stimulated by the sinus node. A rate of 60-100/min is normal.