Incidents of extravasation of contrast media and contrast medium-induced allergy in medical centres and local institutions (unit: cases per year)
| Median | IQR | p Value | |
|---|---|---|---|
| Frequency of contrast-medium extravasation | |||
| Large volume* | |||
| MC (N=16) | 2.75 | 1.00 | 0.050 |
| LI (N=16) | 1.00 | 0.75 | |
| Small volume | |||
| MC (N=15) | 5.00 | 1.51 | 0.342 |
| LI (N=16) | 6.00 | 3.00 | |
| Frequency of allergic reaction to contrast media | |||
| Severe cases† | |||
| MC (N=14) | 0.25 | 0.88 | 0.246 |
| LI (N=16) | 0.00 | 0.13 | |
| Mild cases | |||
| MC (N=17) | 12.00 | 30.00 | 0.728 |
| LI (N=16) | 20.00 | 23.25 | |
| No. of hospitals | Per cent | p Value | |
| Review and improvements | |||
| Cases of allergic reactions‡ | |||
| MC (N=18) | 18 | 100 | 0.029 |
| LI (N=17) | 13 | 77 | |
The Mann-Whitney U test was used to analyse contrast extravasation and allergic reactions; an IQR was acquired from subtracting the 25th centile from the 75th centile. The χ2 test was used to analyse the review and improvements.
*Significant statistical difference (p=0.050) in the frequency of large-volume (volume >20 cm3) contrast extravasation between medical centres and local institutions.
†Severe allergic reactions include coma and death.
‡Significant statistical difference (p<0.050) in the rates of reviewing allergic reaction to contrast agent incidents and improvement between medical centres and local institutions.
LI, local institutions; MC, medical centres.