From Descriptive Hemodynamics to Decision-grade Vasoplegia Phenotyping: The Next Translational Step for Temporal Diastolic Shock Index

We read with great interest the recent prospective observational study by Sarkar et al. evaluating the temporal behavior of the diastolic shock index (DSI) in septic shock. 1 The study is timely and clinically relevant because it shifts attention from static mean arterial pressure (MAP) thresholds toward a more physiologically meaningful representation of vasoplegia.This is important, since contemporary septic-shock literature increasingly recognizes that pressure restoration alone does not fully capture perfusion adequacy, vascular tone, or treatment responsiveness. 23]4 A major strength of the article is that it treats shock as a dynamic syndrome rather than a single hemodynamic snapshot.By integrating heart rate with diastolic arterial pressure, DSI offers a bedside signal that is more closely aligned with vascular tone than MAP alone. 1 This approach is conceptually attractive because two patients with similar MAP may have very different vasoplegic burdens, norepinephrine responsiveness, and risks of persistent hypoperfusion. 3,4In that sense, the study contributes more than another prognostic ratio; it supports the broader move toward physiologically informed phenotyping in septic shock. 23]4 However, the most valuable next step is not simply to confirm that DSI predicts poor outcomes.The real translational question is whether temporal DSI can become decision-grade.For that to happen, three issues deserve emphasis.First, DSI should evolve from a prognostic marker into a therapeutic trigger.Prior work suggests that DSI may help identify patients who are more likely to require vasopressors and may support earlier vasoactive decision-making. 2 Yet observational association is not enough for bedside adoption.Future trials should test whether DSI-guided timing of vasopressor initiation or escalation improves patient-centered outcomes compared with conventional MAP-centered care.Second, DSI should be interpreted within a multimodal perfusion framework, not as a stand-alone index.Recent work has emphasized that septic-shock resuscitation must move beyond pressure alone toward tissue perfusion pressure, vascular waterfall physiology, and individualized treatment effects. 3A high DSI may indicate vasoplegia, but persistent organ hypoperfusion may also reflect microcirculatory dysfunction, myocardial impairment, or inappropriate fluid and vasopressor exposure.Thus, DSI is likely to be most clinically useful when integrated with lactate kinetics, capillary refill, vasopressor dose intensity, and other perfusion markers.Third, the study opens an important global-health opportunity.Because DSI relies on universally available bedside variables, it has Orcid