Patient safety has become an important issue worldwide since the Institute of Medicine published its article “To Err Is Human” in 1999 [1]. Since then, several interventions have been developed and established to improve patient safety [2–4]. Surgery is one major focus of health care improvement. In a recent, restrictive systematic review of studies on adverse events in surgery, Anderson at al. [5] found that adverse events occurred in 14.4% of patients. 5.2% of those events were judged as potentially preventable. Surgery has also been identified as a major predictor of patient reported hospital-acquired infection across 11 countries [6]. The World Health Organization’s (WHO) surgical checklist is an effective intervention to decrease morbidity and mortality in surgical procedures [7–9]. The checklist is now strongly recommended for adoption by international experts as a highly effective yet economically simple intervention [10].

However, implementation of a checklist alone does not necessarily lead to improvements in safety. Compliance with the checklist use is a prerequisite for the checklist to be effective [11]. Generally, compliance rates are often found to be below 100% [8, 12–14]. Health care professionals’ (HCP) knowledge also plays a crucial role for correct and compliant checklist use [7, 11, 15, 16]. Vats et al. [13] explicitly identified lack of knowledge as one important aspect for not correctly using the checklist. The better people are educated about how and why to use the surgical checklist, the more compliant they are. Both, subjective and objective levels of knowledge are important for changes in behaviour and thus successful implementation of interventions [17, 18].

Shared knowledge and beliefs among HCPs are important for successful teamwork and cooperation and implementation of high safety standards, in particular in multiprofessional action-teams, like OR teams [12, 19–24]. Recent research suggests that nurses often have more positive attitudes towards the checklist as compared to doctors and surgeons [22, 23]. Thus, one essential prerequisite for successful checklist is the harmonization of checklist acceptance and knowledge among OR team members. Taken together, the effects of the use of surgical checklists on patient outcome have been widely acknowledged and relevant determinants for successful implementation have been identified. However, little data exist on the current situation in Switzerland. Available studies either address special settings [25] and samples (also see [26]) or are restricted to one hospital [14].

Hence, the aim of the present study was to evaluate checklist use and potentially influential factors in Switzerland. We investigated use, knowledge of, and satisfaction with the surgical checklist in Switzerland in a sample of different professional groups working together in the OR. Subjective and objective knowledge were both assessed as important factors influencing compliance. Levels of satisfaction were assessed, because we hypothesized that knowledge would not only be related to better compliance rates but also to higher levels of satisfaction.

In the present study we investigated the use and knowledge of the WHO surgical checklist in Switzerland. To the best of our knowledge, the study is the first providing a comprehensive overview including all parts of Switzerland as well as different professional groups working together in the OR.

The majority of participants reported the systematic use of a surgical checklist at their primary workplace with no significant differences between the professions. In their study, Fourcade et al. report compliance rates about 92%, however with completion rates being as low as 61% [8, 12]. In their systematic literature review, Borchard et al. report compliance rates ranging from 12% to 100% [11]. Hence, although the results from the present study are comparable to results from the literature, checklist use is still no routine and improvement is needed. Literature shows that one crucial aspect of improving patient safety with the use of a surgical checklist is 100% compliance, including, urgent surgeries [11, 30]. Hence, from the present study the conclusion seems warranted that even though surgical checklists seem to be widely used by some professional groups in Switzerland, still effort and time need to be invested to establish a reliable and exhaustive use for all procedures.

Overall, both professional groups reported moderate satisfaction. This indicates that in ORs where the checklist has been implemented, acceptance is present. But satisfaction with checklist use is likely to be overestimated in the present study. Considering participants’ professional position and years of job experience we infer that individuals in the sample hold influential positions and probably have the opportunity to shape organizational structures and standards. Still up to 16% of nurses and 13% of doctors reported being unsatisfied. One may conclude that individuals in less influential positions might report even lower levels of satisfaction. It is known from psychological research, that perceived control is associated with higher levels of satisfaction (see for example [31]). Hence, one might infer, that individuals in influential positions experience higher levels of control, and, hence might report higher levels of satisfaction. However, this remains speculative and future studies need to investigate predictors of satisfaction with checklist in more detail. Significant differences in levels of satisfaction emerged between professional groups. Doctors reported higher levels of satisfaction than nurses. Group differences in the OR are known from other OR-relevant topics, e.g. perception of teamwork [19, 22, 24]. The origin of these differences remains unclear.

In the analyses of knowledge regarding the WHO-checklist, we found significant differences between WHO-checklist users and non-users and a difference between professional groups. Individuals working with the WHO-checklist achieved significantly higher levels of knowledge than individuals not working with the WHO-checklist. Although doctors achieved higher levels of knowledge than nurses, the effect was too small to be of practical relevance. Note that no inferences about causality can be made. Correlations reflect associations between variables. However, a correlation between variables does not imply that one causes the other. The reason for or the direction of the association between variables is not explained by correlations. Hence, whether better knowledge leads to checklist use or checklist use leads to better knowledge remains unclear.

In a last step, the association between subjective knowledge, objective knowledge, and satisfaction was assessed for both professional groups. No significant association could be found between any of the constructs in both groups. It is known from social cognitive research that not only objectively assessable knowledge but also subjective levels of knowledge are an important factor for the evaluation of situations, attitudes and behaviour [32]. Subjective representations are often of behavioural relevance (e.g., [33] on aging). As a consequence, subjective evaluation of one’s own expertise can be decisive for developing the motivation to take part in trainings or further education concerning the correct use of checklists (e.g.,[34]). With no association between the constructs, as found in the present study, the possibility of a gap between needed and claimed education and training or an overly excessive use of education increases.

This result has important implications for practice: with no association between self-evaluation and objective assessment, employees cannot reliably self-elect themselves for training when needed, because of the lack of adequate assessment of their own level of expertise. In case of overestimation this imposes a possible threat on patients, in case of underestimation, this leads to a waste of resources. The importance of organizational commitment in the process of checklist implementation and the promotion of compliance becomes evident. Without reliable self-management due to a lack of valid self-evaluation, an organization is in charge of ensuring that employees obtain training and education on a regular, institutionalized basis to improve patient safety. Note, however, because subjective knowledge was assessed with one item only, the effect of measurement error also needs to be considered.

The present study has some limitations. First we focused on the WHO-checklist in survey items. The assessment of use and knowledge of other checklists may be underestimated. Because surgical checklists contain similar items and have similar objectives, individuals working with other checklists might have profound knowledge about checklists that has not been assessed in the present study, yet is an important aspect of patient safety in surgery as well. Second, although we assessed compliance in terms of the frequency of use, we have no information about the quality of use. Using the checklist does not exhibit any information about the quality of use as the study by Cullati et al. indicates [14]. Third, our response rate was only moderate. Quantitatively, this response rate is in accordance with similarly designed studies in health care [35]. Although different professional groups and geographical regions are well represented in our sample, we have no information about reasons for non-participation and checklist use among non-responders. However, it is likely that HCP working with an interest in patient safety or the surgical checklist were more likely to respond to our survey. Thus, our results probably overestimate checklist dissemination in Switzerland.

Taken together, what do the results of the present study say about frequency of use, knowledge of, and satisfaction with the WHO-surgical checklist in Switzerland?

According to the results of the present study, checklist use is present in Switzerland on a regular basis. However, a substantial group of HCP’s still does not use checklists as a routine. Satisfaction with checklist use is moderate. Improvement of satisfaction could be used as motivation to fully and comprehensively implement the checklist. Additionally, against the background that knowledge is crucial for successful implementation, levels of knowledge in the present study reveal need for improvement. Even for individuals working with checklists, levels of knowledge are far from perfect. Differences between groups indicate that knowledge acquisition is not systematically supported but is left to individuals. Much more attention needs to be paid to staff’s training and education concerning checklist use.

We conclude that the results provide valuable insight into checklist use in Switzerland.