Table 1.

Search terms

Subject	Search term
ECG	((“Electrocardiography”[MeSH]) AND (“Heart Arrest/etiology”[MeSH] OR “Out-of-Hospital Cardiac Arrest/etiology”[MeSH])) AND “Cardiopulmonary Resuscitation”[MeSH]
Capnography	((((“Prognosis”[MeSH]) OR “Outcome Assessment (Health Care)”[MeSH]) AND “Capnography”[MeSH]) AND ((“Heart Arrest”[MeSH]) OR “Out-of-Hospital Cardiac Arrest”[MeSH]) AND “Cardiopulmonary Resuscitation”[MeSH]
Ultrasonography	(((“Heart Arrest/etiology”[MeSH]) AND “Cardiopulmonary Resuscitation”[MeSH]) AND (“Echocardiography”[MeSH] OR “Ultrasonography”[MeSH])
FEEL	Focused echocardiographic evaluation in life support
Cerebral oximetry	(“Oximetry”[MeSH]) AND “Out-of-Hospital Cardiac Arrest”[MeSH]
POCT	(((((Point of care testing[MeSH terms]) OR (point of care system[MeSH terms])) OR (point of care systems[MeSH terms])) OR (analysis, blood gas[MeSH terms])) AND ((cardiac arrest, out of hospital[MeSH terms]) OR (heart arrest[MeSH terms]))

ECG, electrocardiogram; MeSH, Medical Search Headings and Subheadings; FEEL, Focused Echocardiographic Evaluation in Life support; POCT, point-of-care testing.