Table 2.

Summary of ultrasonographic protocols

	FEEL	CAUSE	PEA	SHOC
Probe positioning	Subxiphoidal	Subxiphoidal (parasternal, apical) Second intercostal space on midclavicular line	Epigastric (apical) Parasternal at second or third intercostal space Left parasternal at third and fourth intercostal space Abdomen Lower limbs	Subxiphoidal (parasternal) Anterior and lateral chest Abdomen Proximal lower limbs Anterior neck
Detectable causes	Hypovolemia Cardiac tamponade Pulmonary embolism	Hypovolemia Cardiac tamponade Pulmonary embolism Tension pneumothorax	Cardiac tamponade Pulmonary embolism Tension pneumothorax Hypovolemia Hyperkalemia Acute coronary syndrome	Cardiac tamponade Tension pneumothorax Hypovolemia Pulmonary embolism
Time frame	Pulse check (max. 10 s)	Cardiac examination: pulse check (max. 10 s) Lung examination: 30 s	Unspecified	Cardiac examination: pulse check (max. 10 s)

FEEL, Focused Echocardiographic Evaluation in Life support; CAUSE, Cardiac Arrest Ultra Sound Examination; PEA, pulseless electrical activity.