Final answer:
Second Degree AV Block Type 2, also known as Mobitz II, presents symptoms such as irregular heartbeats, dizziness, and possibly fainting due to some electrical impulses being blocked in the heart's conduction pathway. ECG changes will show some P waves not followed by QRS complexes.
Step-by-step explanation:
The signs and symptoms of Second Degree AV Block Type 2 (also known as Mobitz II) include irregular heartbeats or missed beats, which a patient might describe as feeling like a skipped heartbeat or palpitations. Some individuals may experience dizziness, lightheadedness, fainting, or chest pain as a result of the heart not pumping effectively due to the interrupted electrical signals.
In a Second Degree AV Block Type 2, on an ECG, you would notice that some P waves are not followed by a QRS complex. This means that some impulses from the SA node do not result in ventricular contraction because they are blocked within the conduction pathway.