TABLE 2

Technegas and ^81mKr Ventilation–Perfusion Status in Relation to Spiral CT Angiography (SCTA) and Pulmonary Angiography (PA) Results

Ventilation–perfusion		All patients	PA performed		PA not performed
^81mKr	Tc	All patients	PA*	PA^†	SCTA*	SCTA^†	SCTA missing^‡
Mismatch	Mismatch^§	40	1	3	28	7	1
Mismatch	Match^∥	12	2	4	4	—	2
Match	Match^¶	37	5	22	1	5	4
Match	Mismatch^#	3	—	2	1	—	—

McNemar, 0.035
κ, 0.68 (95% CI, 0.53–0.82)

↵* Positive for PE.
↵† Negative for PE.
↵‡ Not performed or inconclusive.
↵§ Patient with positive PA also had positive SCTA result; three patients with negative PA all had negative SCTA results.
↵∥ Two patients with positive PA had inconclusive SCTA results; of four patients with negative PA, SCTA result was positive in one, negative in one, and inconclusive in two.
↵¶ Three of five patients with positive PA had positive SCTA result and two had negative SCTA result. SCTA result in 22 patients with negative PA was positive in three patients, negative in 16 patients, inconclusive in one patient, and not performed in two patients.
# One patient with negative PA had positive SCTA result and other patient had negative SCTA result.