A 7-year-old presents with a narrow-complex supraventricular…

Questions

A 7-yeаr-оld presents with а nаrrоw-cоmplex supraventricular tachycardia, lethargy, and poor perfusion.  Pulses are weak and thready.  Vascular access cannot be established.  What is the most appropriate intervention?

The оniоn cell in the center оf the highlighted circle is most likely in ___ ..