🚨Third-degree heart block🚨 🔥 Complete heart block 🔥✔ complete AV dissociation .✔ atrial impulses are not conducted to ventricle .✔ atria and ventricles contract independently .✔ P waves have no relationship with QRS complex .⛔Note👉 P wave may be superimposed on QRS or on T wave.
🚨 Second-degree heart block _ Type 2 ( Mobitz ll ) 🚨✔ P waves are intermittently blocked .✔ normal or fixed prolonged PR Interval with dropped beats " non conducted P waves " .
🔥🔥 Second-degree heart block _ Type 1 ( Mobitz l ) 🔥🔥✔ progressive prolongation of PR Interval with dropped beat." in other words 👉 PR Interval progressively lenghtens until a p wave not conducted to ventricle " .
🔥🔥 First-degree heart block 🔥🔥✔ Fixed " constant " prolongation of PR Interval ( more than 200 ms / more than 5 small squares ) .✔ All P waves are conducted .
🔥🔥 PR Interval 🔥🔥👉 The PR interval is the time from the onset of the P wave to the start of the QRS complex. 👉 It reflects conduction through the AV node.👉 The normal PR interval is between 120 – 200 ms (0.12-0.20s) in duration (three to five small squares).