Both intermittent positive-pressure ventilation and bilevel provided similar oxygenation and ventilation during cardiopulmonary resuscitation. Chest compression synchronized ventilation elicited the highest mean arterial pressure, best oxygenation, and a normal mixed venous pH during cardiopulmonary resuscitation.

This study analyzes causes for successful and unsuccessful search performance in an academic search test collection. Based on a component-level evaluation setting presented in a parallel paper, analyses of the recall base and the semantic heterogeneity of queries and documents were used for performance prediction. The study finds that neither the recall base, query specificity nor ambiguity can predict the overall search performance or identify badly performing queries. A detailed query analysis finds patterns for negative effects (e.g. non-contentbearing terms in topics), but none are overly significant.

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