Hi, Impaired spontaneous ventilation is where a pt actually has decreased energy which prevents them from being able to breathe to sustain life and Ineffective Breathing pattern is where the actually physical process of breathing is not being done properly to allow for proper ventilation. The two are very similar, but I view Impaired spontaneous ventilation as more an internal or metabolic process that just is not allowing a person to breathe and Ineffective Breathing pattern as something more external-so like anxiety, or positioned in bed. Also, the interventions for Impaired spontaneous ventilation are more invasive. Hope that helps.