. 2019 Jun 17;9(6):e027100. doi: 10.1136/bmjopen-2018-027100

Table 1.

Lists of life-threatening maternal conditions (severe maternal morbidity) based on the WHO near-miss criteria, search terms/query

Search terms to be combined with ‘OR’	Perinatal outcome search terms and query
WHO potentially life-threatening/near-miss criteria: shock, cardiac arrest, use of continuous vasoactive drugs, cardiopulmonary resuscitation, severe hypoperfusion, severe acidosis, acute cyanosis, gasping, severe tachypnea, severe bradypnea, intubation and ventilation (non-anaesthetic), severe hypoxemia, oliguria, acute renal failure, acute kidney injury, dialysis, amniotic fluid embolism, pulmonary embolism, deep vein thrombosis, coagulopathy, severe acute thrombocytopenia, acute fatty liver, cholecystitis, intrahepatic cholestasis of pregnancy, liver failure, severe acute hyperbilirubinemia, coma, seizure, stroke, transient ischemic attack, status epilepticus, acute epileptic seizure, cerebrovascular accident, paralysis Generic free-text search terms: synonymous with ‘severe maternal morbidity’: maternal near miss, obstetric near miss, near miss morbidity, obstetric near‐miss, emergency hysterectomy, emergency obstetric hysterectomy, maternal complications, severe maternal morbidity, severe acute maternal morbidity, pregnancy complications, intensive care unit admission, blood transfusion	‘perinatal morbidity’ [tiab] OR ‘adverse outcome’ [tiab] OR ‘neonatal mortality’ [tiab] OR ‘neonatal death’ [tiab] OR stillbirth [tiab)] OR ‘fetal death’ [tiab] OR ‘perinatal death’ [tiab] OR ‘perinatal mortality’ [tiab] OR ‘growth restrict*’ [tiab] OR ‘small for gestational age’[tiab] OR ‘low birthweight’ [tiab] OR ‘preterm birth’[tiab] OR ‘Apgar score’ [tiab] OR ‘neonatal acidosis’ [tiab] OR ‘NICU admission’ [tiab] OR ‘neonatal intensive care admission’ [tiab] OR ‘hypoxic-ischemic encephalopathy’ [tiab] OR ‘periventricular leukomalacia’ [tiab] OR ‘interventricular haemorrhage’ [tiab]

Search terms to be combined with ‘OR’

Perinatal outcome search terms and query

WHO potentially life-threatening/near-miss criteria: shock, cardiac arrest, use of continuous vasoactive drugs, cardiopulmonary resuscitation, severe hypoperfusion, severe acidosis, acute cyanosis, gasping, severe tachypnea, severe bradypnea, intubation and ventilation (non-anaesthetic), severe hypoxemia, oliguria, acute renal failure, acute kidney injury, dialysis, amniotic fluid embolism, pulmonary embolism, deep vein thrombosis, coagulopathy, severe acute thrombocytopenia, acute fatty liver, cholecystitis, intrahepatic cholestasis of pregnancy, liver failure, severe acute hyperbilirubinemia, coma, seizure, stroke, transient ischemic attack, status epilepticus, acute epileptic seizure, cerebrovascular accident, paralysis
Generic free-text search terms: synonymous with ‘severe maternal morbidity’: maternal near miss, obstetric near miss, near miss morbidity, obstetric near‐miss, emergency hysterectomy, emergency obstetric hysterectomy, maternal complications, severe maternal morbidity, severe acute maternal morbidity, pregnancy complications, intensive care unit admission, blood transfusion

‘perinatal morbidity’ [tiab]
OR ‘adverse outcome’ [tiab]
OR ‘neonatal mortality’ [tiab]
OR ‘neonatal death’ [tiab]
OR stillbirth [tiab)] OR ‘fetal death’ [tiab]
OR ‘perinatal death’ [tiab]
OR ‘perinatal mortality’ [tiab]
OR ‘growth restrict*’ [tiab] OR ‘small for gestational age’[tiab] OR ‘low birthweight’ [tiab] OR ‘preterm birth’[tiab] OR ‘Apgar score’ [tiab] OR ‘neonatal acidosis’ [tiab] OR ‘NICU admission’ [tiab]
OR ‘neonatal intensive care admission’ [tiab]
OR ‘hypoxic-ischemic encephalopathy’ [tiab]
OR ‘periventricular leukomalacia’ [tiab]
OR ‘interventricular haemorrhage’ [tiab]

NICU, neonatal intensive care unit.