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2. Electrocardiography - Wikipedia

   en.wikipedia.org/wiki/Electrocardiography

   In a normal heart, the heart rate is the rate at which the sinoatrial node depolarizes since it is the source of depolarization of the heart. Heart rate, like other vital signs such as blood pressure and respiratory rate, change with age. In adults, a normal heart rate is between 60 and 100 bpm (normocardic), whereas it is higher in children. [56]

3. QRS complex - Wikipedia

   en.wikipedia.org/wiki/QRS_complex

   Diagram showing how the polarity of the QRS complex in leads I, II, and III can be used to estimate the heart's electrical axis in the frontal plane. The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually the central and most visually obvious part of the tracing.

4. Junctional rhythm - Wikipedia

   en.wikipedia.org/wiki/Junctional_rhythm

   This means that the time interval between beats stays constant. The next normal finding is a normal QRS. Since the impulse still travels down the bundle of His, the QRS will not be wide. Junctional rhythms can present with either bradycardia, a normal heart rate, or tachycardia. [9] The most obvious abnormal finding will be abnormal P waves.

5. ST depression - Wikipedia

   en.wikipedia.org/wiki/ST_depression

   A mnemonic can be used for some causes of ST depression, namely DEPRESSED ST: [citation needed]. D - Drooping valve (mitral valve prolapse) E - Enlargement of the left ventricle P - Potassium loss R - Reciprocal ST depression (e.g. inferior wall MI) E - Encephalon hemorrhage S - Subendocardial infarct S - Subendocardial ischemia E - Embolism (pulmonary) D - Dilated cardiomyopathy S - Shock T ...

6. Ventricular fibrillation - Wikipedia

   en.wikipedia.org/wiki/Ventricular_fibrillation

   Ventricular fibrillation (V-fib or VF) is an abnormal heart rhythm in which the ventricles of the heart quiver. [2] It is due to disorganized electrical activity. [2] Ventricular fibrillation results in cardiac arrest with loss of consciousness and no pulse. [1]

7. What’s the Difference Between a Normal and Dangerous Heart Rate?

   www.aol.com/difference-between-normal-dangerous...

   High heart rates with associated symptoms such as chest tightness, palpitations or heart pounding/racing, fainting, dizziness, lightheadedness, shortness of breath, or fatigue, it may suggest an ...