Fig. 1.

PH severity and thoracic procedures were associated with major events. (a) Severity of PH at the time of procedure; most had mild PH. (b) Incidence of major and minor events by PH severity classification. Patients with severe PH had a higher incidence of major events (P = 0.006). The incidence of minor events did not differ significantly between groups. (c) Numbers of each procedure type performed. (d) The incidence of major and minor events by procedure. Approximately one-third of central venous access, thoracic, and airway procedures were marked by a major event. The incidence of major events was disproportionately high for thoracic procedures (P = 0.05). No differences in the incidence of minor events were noted between groups.