Cardiovascular System (I00-I99).
- Atrioventricular re-entrant tachycardia (AVRT) – belongs to paroxysmal supraventricular tachycardia; results in seizure-like episodes of tachycardia (heartbeat too fast: >100 beats per minute), dizziness, and possibly signs of acute heart failure (heart weakness
- Sinus arrhythmia – usually respiratory sinus arrhythmia (physiological fluctuation of the heart rate, due to respiration).
- Sinus tachycardia – increased heart rate of more than 100 beats per minute, originating from the sinus node.
- Ventricular tachycardia – cardiac arrhythmia with too fast heartbeat, originating from the ventricles.
- Atrial flutter – cardiac arrhythmia in which the atria of the heart beat irregularly 240 to 340 times per minute at rest, while the ventricles usually beat more slowly
- Atrial fibrillation – cardiac arrhythmia with subordinate activity of the atria.