Final answer:
The appropriate next intervention for a patient with a blood pressure of 70/50 mm Hg and a wide, regular tachycardia with a pulse is to administer intravenous fluids to increase blood volume.
Step-by-step explanation:
In a patient with a blood pressure of 70/50 mm Hg and a wide, regular tachycardia with a pulse, the appropriate next intervention would be to administer intravenous fluids to increase the blood volume and improve blood pressure. The low blood pressure indicates hypovolemia, while the tachycardia suggests compensatory mechanisms to maintain cardiac output. By providing fluids, the blood volume increases, leading to an improvement in blood pressure and cardiac output.