1. Intraoperative epidural catheter malfunction in two obese patients;Leith;Acta Anaesthesiol Scand,1997
2. Potential hazard with the epidural space catheterization;Smith;Anaesthesia,1995
3. Stretching with obstruction of an epidural catheter;Khalour;Anesth Analg,1987
4. Principles and Practice of Regional Anesthesia;Wildsmith,1993
5. Unusual complication of epidural anaesthesia;Nash;Br Med J,1968