The Heart- PQRST and ECG

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Presentation transcript:

The Heart- PQRST and ECG Digischool – Structure of the HumanHeart http://www.youtube.com/watch?v=qmpd82mpVO4 Watch video but skip blank between 1 – 2 min http://www.youtube.com/watch?v=gn6QmETEm8s Cardiac cycle electrical impulse http://www.youtube.com/watch?v=fZT9vlbL2uA An ECG http://www.youtube.com/watch?v=KWrzdJY4G9Q

Monitoring your Heartbeat and Blood pressure

Electrocardiograph - text pg 305, Fig 9-27 An electrocardiogram or ECG records the electrical activity of the heart and monitors heart function. Irregular electrical signals can cause ineffective or unusual heartbeats. Each of the letters PQRST label a specific part of the electrical signals for a heartbeat. A normal heart beats 70 times a minute. 3

Electrocardiograph 1. P – Q wave – the depolarization of the sino-atrial node - Causes atrial systole 2. Q→R → S wave – the depolarization of the atrio-ventricular node - Causes ventricular systole 3. S → T wave - ventricles regain electrical charge Atrial repolarization is NOT seen because it happens during the AV impulse 4

Electrocardiograph 5

Ventricular fibrillation is an abnormal heart rhythm that is disorganized and irregular. This is a heart attack and needs emergency treatment. 6

Ventricular tachycardia is a rapid, regular heart rhythm that originates in the lower chambers of the heart. Many people are healthy and have minor heartbeat irregularities. 7

ECG and the Heartbeat The electrical signals in an ECG generate the heart contractions that make a heartbeat. The heart beat can be heard with a stethoscope. The blood pressure is measured with a sphygmomanometer.