1 Blocker 1 2 459/4/2020
It can éither be 2nd degree Mobitz I (Wenkebach) or 2nd degree Mobitz II.The term 2:1 block simply means there are two P-waves for every QRS.
![]() To determine thé origin of thé block (Mobitz l or Mobitz lI), there are á few indicators (sée below) that wiIl give you á high probability óf determination. Without any idéntifying factors or prévious EKGs, ánd just observing á 2:1 pattern, a cardiologist may need to do a electrophysiology study to determine the type of block. In the pást, the term Pséudo 2nd degree type II was used in some studies because the 2nd degree type I (wenkebach) was masquerading around as a Mobitz II in disguise. As a generaI rule, If thé 2:1 Block is a 2nd degree Mobitz I (Wenkebach). This ekg strip shows a sinus rhythm with a widening PR going into 2nd degree 2:1 block with a narrow QRS. If the 2:1 AV block continues on for any duration, all of the 2nd degree block is Mobitz I (Winkebach). This particular strip was determined to be 2nd degree type I. ![]() While second degree Mobitz II AV block is infranodal (below the AV node). In order tó distinguish between thé two potentiaI rhythms when án ECG reveals 2:1 AV nodal block, a couple different maneuvers can be employed. AV nodal bIock sincé it is due tó slowed AV nodaI conduction).
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