Overview
Reading Severity as a Trajectory
An unstable patient often declares deterioration through changing physiology before the diagnosis is settled.
An unstable patient often declares deterioration through changing physiology before the diagnosis is settled. The useful question is not whether one number is high; it is whether the patient is compensating, deteriorating, or responding to treatment. A severity marker is a signal to examine the patient, repeat what matters, and choose the next level of care—not a diagnosis and not permission to ignore clinical concern. For the NP, interpret every marker on three axes: its absolute value, its direction over time, and the context that can distort it. A new oxygen requirement, rising respiratory rate, falling blood pressure, reduced urine output, or altered mentation may demand action even when an aggregate score is low. Conversely, an abnormal lactate, troponin, D-dimer, or natriuretic peptide needs a clinical explanation rather than an automatic label. Canadian emergency departments use the Canadian Triage and Acuity Scale, while inpatient early warning and rapid-response processes are established locally. Canada has no national sepsis-specific mandated bundle, so the hospital’s policy and escalation pathway must be known. The NP’s job is to connect the marker to a timely...