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Tachycardia: Difference between revisions
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===Sinus Tachycardia=== | ===Sinus Tachycardia=== | ||
====Pathophysiology:==== | ====Pathophysiology:==== | ||
When the sinus node fires with a frequency between 100-180bpm, the term sinustachycardia is used. The maximum heart rate a person can achieve during exercise can be calculated by subtracting the age in years from 210. Usually it is a physiological reaction to stress (exercise, inflammation, stress). External factors can increase the heart rate like coffee and alcohol or drugs. The term inappropriate sinus tachycardia is a persistent increase in resting heart rate or sinus rate unrelated to or an exaggerated response to stress. | When the sinus node fires with a frequency between 100-180bpm, the term sinustachycardia is used. The maximum heart rate a person can achieve during exercise can be calculated by subtracting the age in years from 210. Usually it is a physiological reaction to stress (exercise, inflammation, stress). External factors can increase the heart rate like coffee and alcohol or drugs.<cite>Ghuran</cite> The term inappropriate sinus tachycardia is a persistent increase in resting heart rate or sinus rate unrelated to or an exaggerated response to stress. | ||
====Clinical diagnosis:==== | ====Clinical diagnosis:==== | ||
A sinus tachycardia usually has a gradual start and ending. Diagnosis on the ECG can be made by the morphology of the P-wave. The P-wave has the same morphology during sinus tachycardia as during normal sinus rhythm. An inappropriate sinus tachycardia is diagnosed by when the sinus tachycardia is persistent (therefore non-paroxysmal) and no trigger can be identified. | A sinus tachycardia usually has a gradual start and ending. Diagnosis on the ECG can be made by the morphology of the P-wave. The P-wave has the same morphology during sinus tachycardia as during normal sinus rhythm. An inappropriate sinus tachycardia is diagnosed by when the sinus tachycardia is persistent (therefore non-paroxysmal) and no trigger can be identified. | ||