Final answer:
In a third-degree heart block situation, a normal EKG will not display a correlation between the P waves and the QRS complexes, resulting in abnormal waveforms or potentially complete absence of expected patterns.
Step-by-step explanation:
A wave form that cannot be seen in a normal EKG is characteristically associated with a third-degree (complete) heart block. In this condition, there is no correlation between atrial activity (the P wave) and ventricular activity (the QRS complex).
In a normal ECG, the P wave, QRS complex, and T wave indicate the sequential electrical activity of a heartbeat. However, certain conditions like third-degree block, atrial fibrillation, and ventricular fibrillation show abnormal ECG patterns.
For instance, in a third-degree block, you would see P waves that are not followed by the corresponding QRS complexes, which reflects a complete disassociation of the atrial rhythm from the ventricular rhythm, therefore making it impossible to observe the expected pattern of waves.
Conditions such as ventricular tachycardia and ventricular fibrillation also present with abnormal waveforms on ECG, with ventricular fibrillation demonstrating no normal electrical activity at all.