Department of Anaesthesiology and Intensive Care Medicine, Philipps-University of Marburg, Baldingerstrasse, D-35033 Marburg, Germany *Corresponding author
Accepted for publication: May 24, 2002
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Abstract |
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Methods. A total of 220 patients undergoing preoperative anaesthetic examination before impending surgery under general anaesthesia were asked to rate nine scenarios during immediate postoperative recovery based on four factors (alertness, pain, postoperative nausea and vomiting (PONV), and extra costs) each with three levels. Using conjoint analysis the relative impact of each factor on ranking the scenarios was assessed.
Results. The relative importance of the four factors (as a percentage of the preference decision) was PONV (49%), pain (27%), alertness (13%), and additional costs (11%).
Conclusion. Avoidance of PONV is a major concern for patients before surgery.
Br J Anaesth 2002; 89: 7601
Keywords: recovery, postoperative; vomiting, nausea
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Introduction |
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One of the first to provide useful information about patients preferences for their postoperative recovery was Fredrick Orkin who reported results from a survey of nurses, anaesthetists, support staff, and computer personnel at a national meeting.4 Forty-seven subjects were asked to rate 16 scenarios of immediate postoperative recovery and 15 min were given to perform the rating. Conjoint analysis was used to judge the relative contribution of each item on the final scenario rating. It was found that postoperative nausea and vomiting (PONV) was a major concern. To prevent this complication, they were willing to accept other side-effects, including extra payment (1550 US$). Although the interesting data have not yet been published as a full paper, numerous authors have quoted the abstract to confirm the importance of antiemetic strategies.
Thus, we felt that it would be interesting to apply Orkins approach and evaluate whether the data can be reproduced in patients about to undergo surgery. The complex methodology used by Orkin4 (six factors, up to four levels, resulting in a model with 16 scenarios and four additional scenarios for validation of computed utilities) was modified to allow a simple questionnaire with fewer scenarios.
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Methods and results |
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Conjoint analysis enables the measurement of consumer preferences or ratings of existing or possible products in terms of product attributes and their levels. The purpose of conducting a conjoint experiment is to ascertain the relative importance of product attributes, as well as the most preferred attribute levels.
Nine scenarios of postoperative recovery (out of 81 possible) (Table 1) were offered and the patients were asked to rate them from 1 (highly undesirablewould avoid this scenario if ever possible) to 9 (desirablescenario of my choice for my impending operation) in a raising sequence. At this moment, patients knew that standardized anaesthesia care was offered and no extra money would be charged from them, regardless of their given answers.
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Comment |
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Macario3 used a similar technique. Patients were asked to spend an amount of virtual money (100 US$) was prevent several unpleasant side-effects of anaesthesia.3 Interestingly, the amount of money spent to prevent vomiting (18 US$) and nausea (12 US$) is greater than that to prevent other unpleasant side-effects, for example postoperative pain (17 US$) or shivering (8 US$). Concerns about PONV (23%) and postoperative pain (14%) were most often raised by patients when asked about preoperative fears before surgery.1
One limitation of the present study is that patients, due to instructions from our ethics committee, knew that a standardized anaesthesia technique was provided and that they were not actually charged regardless of their answers. However, dealing with virtual scenarios is a common situation when performing conjoint analysis and should not disprove our results. Furthermore, from other surveys using the willingness-to-pay method, we know that patients are not penny-pinching when their postoperative well-being is concerned. For example, patients are willing to pay 56100 US$ for a totally effective antiemetic.2
It is concluded that, regardless of the surveying technique used,14 avoidance of PONV followed by the control of postoperative pain are the key concerns for patients undergoing a surgical procedure under general anaesthesia. Patients are willing to accept other side-effects and also increased private costs, when PONV can be attenuated or even completely prevented.
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References |
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2 Gan TJ, Sloan F, de L Dear G, El-Moalem HE, Lubarsky DA. How much are patients willing to pay to avoid postoperative nausea and vomiting? Anesth Analg 2001; 92: 393400
3 Macario A, Weinger M, Carney S, Kim A. Which clinical anesthesia outcomes are important to avoid? The perspective of patients. Anesth Analg 1999; 89: 6528
4 Orkin FK. What do patients want? Preferences for immediate postoperative recovery. Anesth Analg 1992; 74: S225