Greater than Q12 seconds is considered abnormal. - AV Block 2nd Degree AV Block 3 3rd Degree AV Block Bundl

## Step 1<br />The problem is asking us to identify which of the given options is considered abnormal when the heart rate is greater than 0.12 seconds. The options are AV Block, 2nd Degree AV Block, 3rd Degree AV Block, and Bundle Branch Block.<br /><br />## Step 2<br />The AV block, also known as atrioventricular block, is a type of heart block where the conduction of the electrical impulses from the atria to the ventricles is impaired. This can lead to a slower heart rate.<br /><br />## Step 3<br />The 2nd Degree AV Block is a type of AV block where the electrical impulses are partially blocked, leading to a slower heart rate.<br /><br />## Step 4<br />The 3rd Degree AV Block, also known as complete heart block, is the most severe form of AV block. In this condition, the electrical impulses from the atria are completely blocked from reaching the ventricles, leading to a very slow heart rate.<br /><br />## Step 5<br />The Bundle Branch Block is a condition where there is a delay or blockage in the conduction of the electrical impulses along the bundle branches, which can lead to a slower heart rate.<br /><br />## Step 6<br />Given that the problem specifies that a heart rate greater than 0.12 seconds is considered abnormal, the most appropriate answer is the 3rd Degree AV Block, as it is the most severe form of AV block and can lead to a very slow heart rate.