Final answer:
The recommended action for a patient with asymptomatic, stable wide-complex tachycardia is to seek expert consultation, likely with a cardiologist or electrophysiologist, for proper diagnosis and management.
Step-by-step explanation:
The recommended action for a patient experiencing rapid irregular wide-complex tachycardia with a ventricular rate of 138/min, asymptomatic and with a stable blood pressure, is D. Seeking expert consultation. The patient's history of angina and current clinical stability suggests the immediate need for expert assessment rather than emergency intervention. Tachycardia can be associated with various conditions, but given its wide complex nature, this case may suggest ventricular tachycardia, requiring detailed evaluation rather than an immediate ad hoc pharmacological treatment or synchronized cardioversion.
Treatments for cardiac arrhythmias can range from medications to implantable cardioverter defibrillators, ablation, or surgery, depending on the cause. Without symptoms or hemodynamic instability, it is prudent to consult with a cardiologist or electrophysiologist who can interpret the rhythm and guide appropriate management that may include further diagnosis, observation, or targeted intervention.