Final answer:
An EKG indicating a heart rate of 105 beats per minute should be considered a sign of tachycardia, a condition characterized by a faster-than-normal heart rate, generally above 100 beats per minute in adults.
Step-by-step explanation:
A medical assistant performing an EKG on a patient with a heart rate of 105 beats per minute should identify this finding as an indication of tachycardia. This condition is characterized by a heart rate that is too fast, which is generally defined as a heart rate over 100 beats per minute in adults. The increase in heart rate could be due to various reasons, such as physical activity, or stress, or could be indicative of a medical condition. When aberrant electrical patterns before the QRS complexes are noted, along with an increased frequency between these complexes, it is typically associated with abnormal conduction within the heart, potentially leading to tachycardia. However, it is essential to look at the entire clinical picture, including symptoms and other findings, to make a definitive diagnosis.