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Sinus Tachycardia - Sinus Rhythms


sinus tachycardia ekg tracing
  • Sinus Tachycardia occurs when the rate of electrical impulse formation occurs at a rate exceeding 100 bpm.
  • This can occur for a number of different reasons i.e. diet, stress, illness, response to physical exertion etc.
  • The only difference between Normal Sinus Rhythm and Sinus Tachycardia (Sinus Tach) is the rate exceeds 100 bpm. All other steps of rhythm analysis will be “normal.
  • An additional challenge that will present as rhythm rates accelerate is that the cardiac complexes will come closer together. This can result in the P wave becoming partially or completely buried within the T wave of the previous cardiac complex.
  • The result of a partially buried P waves means you are unable to establish the beginning of atrial depolarization. Meaning you will be unable to measure and report the PR interval. The only way it will be possible is if the physician instructs you to increase the machine printing speed (remember interval times will double at 50 mm/sec).

Practice Strip

sinus tach ekg

Analyze this tracing using the five steps of rhythm analysis.

Show Answer
  • Rhythm: Regular
  • Rate: 125
  • P wave: upright, partially buried
  • PR interval: unable to determine
  • QRS: 0.08 sec
  • Interpretation: Sinus Tachycardia

Authors and Sources

Authors and Reviewers


? v:3 | cc: | tar: False | onAr:0 | onPs:2 | tLb:3 | tLbJs:0
| pv: 1 uStat: False | db:0 | shouldInvoke:False | pu:False | em: | refreshTime: 1/1/0001 12:00:00 AM || now: 7/13/2024 7:15:26 PM | firstPage: True
| statusStg: | cDbLookup# 0

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