Chemotherapy-induced emesis

The nausea and vomiting associated with some chemotherapy regimes is a cause of much anxiety amongst patients. Effective control of chemotherapy-induced nausea and vomiting is therefore a primary goal for the clinician.

When vomiting occurs soon after the administration of a cytotoxic drug, chemotherapy-induced emesis should only be diagnosed when other possible causes of vomiting have been excluded, e.g.:

• brain metastasis
• obstruction by the tumour
• hypercalcaemia
• unrelated causes, e.g. gastroenteritis or gastric ulcer

Specialists recognise three phases of nausea and vomiting associated with chemotherapy:

• 'acute' (occurring within 24 hours of administration of chemotherapy);
• 'delayed' (occurring more than 24 hours after administration and lasting for up to 5-7 days)
• 'anticipatory' (occurring on the day or hours leading up to chemotherapy) -aticipatory nausea and vomiting generally only develop when previous chemotherapy has been followed by severe nausea and vomiting, and is believed to represent a conditioned response

Reference:

1. Drug and Therapeutics Bulletin 2005; 43 (8):57-61.
2. Grunberg, SM. & Hesketh, PJ.. Control of chemotherapy-induced emesis. New Engl. J. Med. 1993;329(24): 1790-1796.