Table 2.
Case-crossover analysis of medical services associated with catheter dysfunction.
| Type of medical service | 3 Case* sessions | 3 Control** sessions | Odds ratio (P-value) |
1 Case session | 1 Control session | Odds ratio (P-value) |
|---|---|---|---|---|---|---|
| Missed session due to access problems | 103 | 66 | 1.56 (<0.01) | 94 | 56 | 1.68 (<0.01) |
| Access procedure | ||||||
| Limited definition*** | 301 | 234 | 1.29 (<0.01) | 212 | 179 | 1.18 (0.10) |
| Expanded definition**** | 365 | 290 | 1.26 (<0.01) | 289 | 226 | 1.28 (<0.01) |
| Missed session or access procedure | 398 | 291 | 1.37 (<0.0001) | 321 | 246 | 1.30 (<0.01) |
| Hospitalization (any diagnosis) | 395 | 354 | 1.12 (0.13) | 293 | 225 | 1.30 (<0.01) |
*Sessions immediately prior to event, that is, sessions 1–3 prior to event.
**Sessions before case sessions, that is, sessions 4–6 prior to event.
***Consists of injection for catheter evaluation with fluoroscopy (36598); thrombolytic declotting of catheter (36593); mechanical removal of clot (36596); mechanical removal of intraluminal (intracatheter) obstructive material (75902); injection of “TPA” (J2997).
****Consists of those procedures included in the limited definition, plus tunneled catheter exchange or replacement (36581), and the combination of removal of tunneled catheter (36589) plus tunneled catheter insertion (36558).