Final answer:
A positive QRS complex in lead aVR on an EKG would indicate to a Patient Care Technician that the limb leads may have been reversed. Normal EKG readings and the significance of each wave are essential for accurate diagnosis of cardiac conditions.
Step-by-step explanation:
When a Patient Care Technician (PCT) is performing an EKG on a patient, there are specific patterns and waves that indicate the normal electrical activity of the heart. If the limb leads are reversed, one of the observations that should indicate this to the PCT is a positive QRS complex in lead aVR. Normally, lead aVR has a predominantly negative deflection, so a positive QRS would be abnormal and suggest lead misplacement. The presence of inverted P waves in lead II, absence of the QRS complex in lead III, or inverted T waves in lead aVL could indicate other types of cardiac abnormalities or issues and are not specific to lead reversal.
Each wave on an ECG has a specific meaning, with the P wave representing atrial depolarization, the QRS complex representing ventricular depolarization, and the T wave indicating ventricular repolarization. Understanding these waves is crucial for correct ECG interpretation and detecting abnormalities that could indicate serious health issues like myocardial infarction, atrial enlargement, ventricular hypertrophy, or conduction blocks.