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)

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)

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.

Sinus rhythm on ECG

Can we get some citations for this section. For example, are these criteria provided by WHO, American Medical Association, etc. Additionally, the 1. 1., 2. 2. looks silly. 137.73.10.159 (talk) 15:55, 13 December 2011 (UTC)