Impella 5.5, a temporary left-sided heart pump, unexpectedly improved right ventricular-pulmonary artery hemodynamics in cardiogenic shock patients, even those with poor baseline right heart function. The retrospective analysis of patients from 2019-2023 revealed that right ventricular function itself didn't predict death or post-procedure complications, but changes in the ratio of right atrial to pulmonary capillary wedge pressure emerged as a powerful predictor of outcomes. This finding challenges conventional wisdom about mechanical circulatory support primarily benefiting the left ventricle. The results suggest clinicians shouldn't avoid early intervention with temporary mechanical support devices in patients with compromised right heart function, as previously assumed contraindications may not apply. The identification of the RA/PCWP ratio as a key prognostic marker could reshape how cardiologists monitor and manage cardiogenic shock patients. However, this preprint awaits peer review, and the retrospective design limits causal conclusions. The findings represent an incremental but clinically meaningful advance in understanding how mechanical heart support affects the entire cardiovascular system, potentially expanding treatment options for critically ill cardiac patients who might otherwise be deemed too high-risk for intervention.