Ecg Report

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Date Submitted: 05/15/2013 11:22 PM

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ECG report

1: More cells depolarise in the QRS, because the muscle mass of the atria is small compared to the ventricles, therefore the electrical impulses within the atria are shorter and less mV. The ventricles being larger, there is a bigger deflection on the ECG.

2: Ventricles are bigger than atria, also the ventricular muscle is thicker than the atria muscle.

3: The peak to peak interval of R waves is dependent on the heart rate, therefore the faster the heart rate the shorter the peak to peak interval. When HR is slower the interval between peaks widens.

4: SV in fit individuals is much higher, it is influenced by factors such as volume of blood returning to the heart, sympathetic nerve activity and levels of circulating epinephrine, during exercise these things all increase HR. The fit person typically has a slower resting heart rate thank an unfit person, therefore leaving more room for increase of SV. SV increase = CO increase. CO can only increase further if HR increases once 50% exercise tolerance is reached. So basically, a fit resting HR of 40bpm has more room for increase of CO than an unfit persons resting heart rate of 90bpm.

5: Different. Many factors lead to differences… age, male/female, fitness levels, heart rates, smokers. Basically all 3 members NSR with minor (s) and mV differences.

6: Fitness levels. Fitter individuals have lower resting HR than unfit.

7: QRS represents the electrical depol of the Ventricle, which causes immediate contraction.. this leads to ejection of blood from the ventricle (systole), the ‘Lub’ sound is the noise of the AV valve closing at the beginning of systole.

8: ‘Dub’ sound is the end of systole, caused by the closure of the aortic & pulmonary semilunar valves. The T Wave is actually the Ventricular repol, which occurs just prior to diastole.

9: There is a lag between QRS complex and arrivals of pulse in finger because;

-time it takes to circulate the wave (pulse) through the body...