Sinus tachycardia laboratory findings: Difference between revisions
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(Created page with "===Electrocardiogram=== * Rate: Greater than 100. * Rhythm: Regular. *P waves: Upright, consistent, and normal in morphology (if no atrial disease) *PR interval: B...") |
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Latest revision as of 17:04, 20 August 2013
Electrocardiogram
- Rate: Greater than 100.
- Rhythm: Regular.
- P waves: Upright, consistent, and normal in morphology (if no atrial disease)
- PR interval: Between 0.12–0.20 seconds and shortens with increasing heart rate
- QRS complex: Less than 0.12 seconds, consistent, and normal in morphology
- Pathophysiology: Sinus tachycardia is considered "appropriate" when a reasonable stimulus such as fever, anemia, fright, stress, or physical activity, provokes the tachycardia. This is in distinction to Inappropriate sinus tachycardia where no such stiumulus exists.
EKG Examples
Shown below is an EKG example of sinus tachycardia with a heart rate of 125/min. The rhythm is regular.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/File:Sinustachycardia.jpg
Shown below is an EKG example of 12 lead EKG showing sinus tachycardia. The heart rate is 150 bpm
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page