Premedication and short term complications in iohexol discography.

In 52 patients 0.5-3.0 ml of iohexol, 180 mg/ml, was injected using lateral injection technique and fluoroscopy control. A total of 146 lumbar discs using local anaesthesia was injected. Two types of premedication were used; either diazepam alone or diazepam in combination with pethidine and glycopyrronium bromide. There was no difference in the discography injection pain between the groups (X2 = 0.774, P greater than 0.05]. During discography, some patients had nausea (2%), convulsions (4%), back pain (6%) and hypotension (10%), but no allergic reactions were seen. This suggests that these immediate reactions are more related to the procedure itself than to the non-ionic ratio 3.0 iohexol contrast medium. More troublesome iatrogenic complications were seen the day after the discography in the form of severe headache (10%) probably related to liquor leakage, and increasing low back pain (81%). The latter may be caused by local haematoma or chemical irritation from iohexol. Patients with no pain during injection had a relatively slight need for analgesics (Somer's D = -0.196, P less than 0.05).