- Basics of ECG Interpretation11 Topics
- Normal ECG Parameters
- ECG Interpretation of Chamber Enlargement4 Topics
- Dysrhythmias
- Bradycardia
- Heart Block3 Topics
- Sick Sinus Syndrome
- Tachycardia8 Topics
- Hyperkalemia
- Myocardial Hypoxia/Ischemia
- Low Amplitude QRS Complex
- Wide QRS Complex
- Bundle Branch Block
- Differentials for ECG Abnormalities
Lesson 8, Topic 1
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Sinus Tachycardia
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Sinus tachycardia is a sinus rhythm with an increased sinus nodal rate, and therefore ventricular rate.
- Dog (<20 kg) with heart rate >180 bpm
- Dog (>20 kg) with heart rate >160 bpm
- Cat with heart rate >240 bpm
Examples of etiologies include:
- Pain
- Fever
- Anemia
- Hypovolemia
- Reduced cardiac output (and resultant hypotension)
- Hyperthyroidism
- Excitement or stress
Consequences:
- If HR is excessive, cardiac output may fall due to reduced diastolic filling time
- Coronary perfusion decreases, also due to shorter diastole
- Increased myocardial oxygen consumption per beat
- The above are generally only significant if sustained for long period of time
Treatment: Treat the underlying cause.
