Answer the following questions on Bulleting Board 1) identify key components of the cadiac conduction system....

Answer the following questions on Bulleting Board

1) identify key components of the cadiac conduction system.

2) List sequence of electrical cardiac events

3) describe EKG waves, complexes and intervals

Solutions

Expert Solution

1. key components of the cardiac conduction system:

the depolarisation process which is started from the sino-atrial node and then transfer to the atrio-ventricular node through the atrial mwall.
before depolarisation of the ventricle there is a delay in transmitting conduction is known as delay in A-V node.
then the conduction transmit to the ventricle for ventricular depolarisation through bundle if his and then to left bundle branch (LBB) and right bundle branch (RBB).

2.sequence of electrical cardiac event:

the sequence of electrical cardiac nevents are:

atrial systole: is a impulse generated from SAN and last for 0.1 sec. here atria muscle contracts and its pressure increases.
ventricular systole: is a process of excitation where ventricle contract and ventricular pressure increases. duration is 0.3 sec. here we can listen the first heart sound.
ventricular diastole: at the end of ventricular systole the ventricular pressure is drops and arterial pressure maintained and immediately it increases and closed the semilunar valve which creates the second heart sound. it lasts for 0.5sec.
arterial diastole: here the atrial muscle relax and pressure gradually increases. it lasts for 0.7sec.

3. EKG waves, complexes and intervals:

P-waves: is formed due to atrial depolarisation due to the transmission of impulse from sino-atrial node to atrial muscle.
P-R interval: is formed due to transmission of impulse to ventricles. that delay in contraction of ventricle represent p-r segment.
QRS complex: is formed due to the ventricular depolarisation.
S-T segment: is formed due to the atrial repolarisation or the time taking for relax of atrial muscle.
T-wave is formed due to ventricular repolarisation.
U-wave: sometime duet o hyper kalemia there is formation of U-wave. which is very rare.

Nightingale answered 1 year ago

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