A 58-year-old man with acute inferior STEMI and ST elevation in leads II, III, and aVF is brought to the catheterization laboratory. Right-sided ECG leads are obtained, revealing ST elevation ≥1 mm in lead V4R, confirming right ventricular infarction. The patient's blood pressure is 88/56 mmHg, JVD is elevated, and lung fields are clear on auscultation. The cardiologist is preparing the acute management strategy marked as **D** in the diagram. Which of the following interventions is CONTRAINDICATED in the acute phase of this patient's presentation?