Measuring Activated Clotting Time during Cardiac Catheterization and PCI: The Effect of the Sampling Site

Table 2

Sample site comparison.

Sampling site	Successful measurements	Mean ACT (s)	SD (s)
Catheter	96	244	53
Sheath	97	262	80
IVL	86	221	54
Matched comparisons	ACT mean difference (s)	SD	value
Catheter vs. sheath (N = 94)	−18.3	96.0	0.067
Catheter vs. IVL (N = 82)	25.7	75.5	0.003
Sheath vs. IVL (N = 83)	39.0	102.8	0.001

ACT values obtained had a significantly lower ACT values as compared to both arterial catheter and arterial sheath. There were no significant differences between ACT values from arterial catheter and arterial sheath blood samples. Statistically significant difference in the two-tailed paired T-test (α = 0.05). s = seconds; SD = standard deviation; IVL = intravenous line.