Ramsey Electronics MR6 Manual de instrucciones descargar pdf (Pagina 6)

ECG1 • 6

right ventricles. The impulse continues through the Purkinje fibers causing the

ventricles to contract and squeezing the blood on its way throughout the body.

In the time that this is happening, the atria are resetting for the next beat, or

repolarizing. The polarization effect on the muscle cells is due to ionic-

molecular level function of the individual cells, and the ionic compounds

(including sodium (Na), potassium (K), and calcium (Ca)) contained in the cells

themselves.

While the Sinoatrial node is the built in pacemaker of the heart, this too can be

adjusted by the autonomic nervous system, which reacts to the everyday

stresses that we subject ourselves to. Consider the range we put our heart

muscle through every day, from rest (sleeping), through moderated activity

(walking, talking), to aerobic workouts (jogging, bicycling). It is certainly a good

thing that we have a feedback mechanism wired in for our range of activity.

The EKG (or ECG) waveform:

A typical cycle of the heart rhythm is shown in the following diagram. The timing

pattern is a follows:

1) The P wave is seen. This corresponds to

both the atrium contracting (depolarizing) and priming

the ventricle with blood.

2) The QRS complex is where the stronger

ventricles fire, pushing blood through the pulmonary

artery to the lungs, and through the aorta to the body.

3) The T wave is the time at which the

ventricles repolarize themselves for the next beat .

*Please note that there are many additional sources

of information on the interpretation of ECG

waveforms; visit your local library or search the World

Wide Web (search for ECG or EKG).

P Wave

QRS & T Wave

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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Ramsey Electronics MR6 Manual de instrucciones Pagina 6