Physiology ecg heart notes copy PDF

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Physiology ecg heart notes copy...

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Physiology Heart review - 4 chamber muscular pump - Thoracic cavity Electricity of the heart- contractions of any muscle is associated with electrical changes. These changes can be detected by an electrode attached to the surface of the body. All muscular contractions can be detected therefore skeletal muscle bust be still. cardiac cycle – look into more Systolic phase-= ventricle contraction Pace maker – SA node (RA) AV junction – AV node + bundle of hiss LBB+RBB Purjinke fibres A typical ECG wave is; - P-wave - QRS complex – electrical impulse moving through the ventricles (ventricular depolarisation) - T-wave – ventricular re-polarisation (about to start relaxation) How to conduct the test?

Use of 10 electrodes Focused around the ventricles. Specific locations. RR- right arm LA- left arm RL- right leg LL- left leg

V1- right sternal border, 4th intercostal space V2- left sternal border, 4th intercostal space V3- in a diagonal line between v2+v4 V4- 5th intercostal space, mid clavicular line V5- mid axillary line, 5th intercostal space V6- anterior axillary plane, 5th intercostal space

Lead 1 – RA(-) to LA (+) Lead 2 – RA(-) to LL(+) Lead 3 – LA(-) to LL(+) aVF aVL aVR

1 small square = 0.04s 1 large square = 0.2s 5 large squares = 1s 300 large squares = 1 min

300 divided by number of large boxes between R waves “RR interval” = HR...