...ELECTRICAL activity of heart is assessed by reading electrocardiogram (ECG), Mechanical activity by echocardiography (ECHO) and Coronary structure and function by coronary angiography! Electrical activity must get transformed into mechanical activity, otherwise it is PEA - pulseless electrical activity requiring CPR - Cardiopulmonary Resuscitation! Electrical and mechanical activities depend on coronary blood flow for supply of nutrients and oxygen; when the coronary blood supply is scarce, the heart begins to cry for oxygen: chest pain!
P.S. ...in the ECG below all the 3 types of block are Atrioventricular (AV) block, implying that the conduction through the AV node is delayed in different fashion!
...other kinds of block are like left or right bundle branch block; and trifascicular block, implying that together with right bundle branch, left bundle branch's two branches viz left anterior fascicle and left posterior fascicle are as well blocked.
...1st degree AV block means that there is "fixed" prolongation of PR interval (0.12-0.21 sec - normal), but there is no occasional non-conduction through the AV node unlike in 2nd and 3rd degree blocks, in which "beat" drops or there is "absence of QRS complex" i.e. P is not followed by QRS - sinus rhythm is lost in both 2nd and 3rd degree AV blocks! In the 1st degree AV block the sinus rhythm is maintained!
...2nd degree AV block has 2 types: Mobitz I (progressive prolongation of PR interval i.e. subsequent PR intervals length increase in arithmetic progression and then after a drop of a "beat" or "QRS", there is shorter PR again and progressively increases until a beat or QRS drops!
...2nd degree AV block Mobitz II implies that there is "fixed" PR interval prolongation in each ECG complex (P followed by QRS and T) i.e. all subsequent complexes have same PR interval but prolonged, more than normal. Therefore, it is like 1st degree AV block but "beat" or "QRS" drops unlike in 1st degree AV block!
...the difference between the Mobitz I and II is about "fixed" and "progressive" prolongation of PR interval - former progressive, latter fixed. In both, there can be drop in beat or QRS! When there are two P waves but only one QRS, it is 2:1 block, similarly there can be 3:1 and so on and do forth!
...3rd degree AV block implies that there is total dissociation between the atrium and ventricle, the two are not synchronised! There is no fixed pattern unlike in the 2nd degree AV blocks!
Heart block:
https://en.m.wikipedia.org/wiki/Heart_block
Trifascicular Block:
https://en.m.wikipedia.org/wiki/Trifascicular_block
P.S. ...in the ECG below all the 3 types of block are Atrioventricular (AV) block, implying that the conduction through the AV node is delayed in different fashion!
...other kinds of block are like left or right bundle branch block; and trifascicular block, implying that together with right bundle branch, left bundle branch's two branches viz left anterior fascicle and left posterior fascicle are as well blocked.
...1st degree AV block means that there is "fixed" prolongation of PR interval (0.12-0.21 sec - normal), but there is no occasional non-conduction through the AV node unlike in 2nd and 3rd degree blocks, in which "beat" drops or there is "absence of QRS complex" i.e. P is not followed by QRS - sinus rhythm is lost in both 2nd and 3rd degree AV blocks! In the 1st degree AV block the sinus rhythm is maintained!
...2nd degree AV block has 2 types: Mobitz I (progressive prolongation of PR interval i.e. subsequent PR intervals length increase in arithmetic progression and then after a drop of a "beat" or "QRS", there is shorter PR again and progressively increases until a beat or QRS drops!
...2nd degree AV block Mobitz II implies that there is "fixed" PR interval prolongation in each ECG complex (P followed by QRS and T) i.e. all subsequent complexes have same PR interval but prolonged, more than normal. Therefore, it is like 1st degree AV block but "beat" or "QRS" drops unlike in 1st degree AV block!
...the difference between the Mobitz I and II is about "fixed" and "progressive" prolongation of PR interval - former progressive, latter fixed. In both, there can be drop in beat or QRS! When there are two P waves but only one QRS, it is 2:1 block, similarly there can be 3:1 and so on and do forth!
...3rd degree AV block implies that there is total dissociation between the atrium and ventricle, the two are not synchronised! There is no fixed pattern unlike in the 2nd degree AV blocks!
Heart block:
https://en.m.wikipedia.org/wiki/Heart_block
Trifascicular Block:
https://en.m.wikipedia.org/wiki/Trifascicular_block
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