Final answer:
An irregular, narrow complex tachycardia with abnormal electrical patterns and increased QRS frequency on an ECG suggests an increased heart rate (pulse). Tachycardia may be symptomatic of various underlying conditions and requires treatment based on the specific cause. Without more context, a repeat dose cannot be determined.
Step-by-step explanation:
The question addresses a situation in which a 68-year-old male is experiencing an irregular, narrow complex tachycardia. Given the information about the abnormal electrical pattern in the ECG prior to the QRS complexes, and the increased frequency between QRS complexes, we can infer that the heart rate (pulse) has increased. Tachycardia is defined as a heart rate above 100 beats per minute (bpm). In a resting patient, this is not normal and can be indicative of a variety of conditions that could be benign or more serious, such as fever, anemia, or heart disorders. It is also mentioned that tachycardia can result from stimulation from the limbic system or disorders of the autonomic nervous system, among other causes.
Treatment for tachycardia depends on the underlying cause but may include medications, implantable cardioverter defibrillators, ablation, or surgery. In arrhythmias like atrial fibrillation, which might cause the described ECG pattern, specific antiarrhythmic medications or procedures might be indicated.
The original question about the repeat dose is unclear as there is no prior context for what medication or initial dose was given. Therefore, it isn't possible to provide an accurate answer without additional information on the specific medication and initial dose.