INTRAVENTRICULAR MORPHINE FOR INTRACTABLE PAIN OF ADVANCED CANCER

Among the most difficult pain management problems are those associated with advanced head and neck cancer, and those in which pain is midline, bilateral, or diffuse. The authors report effective control of intractable pain in 52 patients by injection of small doses of morphine via an Ommaya or a Cordis reservoir into the lateral cerebral ventricle. The technique is safe and effective. The reservoir is usually inserted under local analgesia so the method of pain relief is available to patients in whom general anesthesia would be difficult or contraindicated. The doses of morphine required to maintain analgesia remain remarkably low. Tolerance reported by other authors has not been a problem when preoperative assessment of the patient has been thorough. Maximum survival time has been 75 wk and another patient has lived 65 wk. Complications included two colonized reservoirs, one dislodged ventricular catheter, three blocked catheters, and one postoperative meningitis. For patients with diffuse midline or bilateral pain, or intractable pain associated with advanced head and neck cancer, the use of intraventricular morphine should be considered when satisfactory pain relief is not achieved with oral morphine or continuous subcutaneous infusion.