Certified Flight Registered Nurse (CFRN) Practice Exam 2025 - Free CFRN Practice Questions and Study Resources.

When lead aVR is positively deflected, it typically indicates a lead misplacement rather than a true physiological change in cardiac activity. Lead aVR is positioned to look at the heart from the right shoulder, and a positive deflection in this lead is unusual. Normally, one would expect aVR to show negative deflections in a healthy heart with normal conduction. A positive deflection can occur if the electrodes are placed incorrectly, leading to misleading electrical signals that do not accurately represent the heart's activity.

In contrast, other conditions such as a posterior wall myocardial infarction (MI) or septal wall MI would produce characteristic changes in leads that have a more standard electrical vector orientation and would not typically cause an isolated positive deflection in lead aVR. The left lateral recumbent position may alter the orientation of cardiac electrical activity, but it is unlikely to directly lead to a positive aVR deflection without considering other leads.