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The study found significant associations between both short- and long-term exposure (usually defined as 30 days or more) of environmental heat during a pregnancy and severe maternal morbidity. Severe maternal morbidity is a term used by the Centers for Disease Control and Prevention to define 21 unexpected outcomes during labor or delivery that are considered near misses for maternal mortality. This could include cardiac arrest, eclampsia, heart failure, sepsis and ventilation. (The primary findings excluded whether a blood transfusion occurred during delivery, usually an indicator of severe maternal morbidity, because the data wasn’t detailed enough.)