Article Text


Equipment-related incidents in the operating room: an analysis of occurrence, underlying causes and consequences for the clinical process
  1. I Wubben1,
  2. J G van Manen1,
  3. B J van den Akker2,
  4. S R Vaartjes3,
  5. W H van Harten1
  1. 1University of Twente, School of Management and Governance, Department of Health Technology and Services Research, Enschede, The Netherlands
  2. 2Isala Klinieken, Hospital, Operation Rooms Department, Zwolle, The Netherlands
  3. 3Medisch Spectrum Twente, Department of Medical Physics, Hospital, Enschede, The Netherlands
  1. Correspondence to Dr W H van Harten, University of Twente, Department of Health Technology and Services Research, PO Box 217, 7500 AE Enschede, The Netherlands; w.h.vanharten{at}


Background Equipment-related incidents in the operating room (OR) can affect quality of care. In this study, the authors determined the occurrence and effects on the care process in a large teaching hospital.

Methods During a 4-week period, OR nurses reported equipment-related incidents during surgery procedures in both locations of the hospital. The incidents were reported using a separate form for each incident. A structured analysis (PRISMA) was used to analyse incidents that resulted in serious delays (>15 min).

Results Forms were returned for 911 out of 1580 surgeries (57.7%). In total, 148 incidents were registered, relating to a total of 29 h and 45 min of extra work. In addition, 12 h and 9 min of operational delay was registered. Most incidents involved instruments (46%) or medical devices (28%). 68% occurred during surgery and 32% during the preparation phase. No direct physical harm was reported, although indirect harm, like longer anaesthesia, did occur and can be defined as an adverse event. 10% of the incidents led to a delay of over 15 min. For these incidents, ‘management decisions’ (eg, inventory capacity, planning procedure) was the most encountered root cause. Only six out of the 148 incidents found corresponded with the blame-free reporting database.

Conclusions Equipment-related incidents occurred frequently in the involved hospital sites (up to 15.9%) and resulted in some extra work and additional minutes of delay per event. Management decisions have considerable influence on the occurrence of equipment-related incidents. There was serious under-reporting of incidents.

Statistics from

Literature suggests that adverse events in hospitals occur at unacceptably high rates1–5 and that a considerable percentage are preventable.2 3 6 The exact number of (near) incidents in hospitals is unknown, as good incident-reporting systems are lacking or are used inconsistently.7 With respect to incidents in the operating room (OR), Cooper concludes in two studies that 14% of incidents during anaesthesia procedures are the result of overt equipment failure.8 9 In addition, ‘equipment design was indictable in many categories of human error, as were inadequate experience and insufficient familiarity with equipment.’8 This distinction in error causation can be related to active and latent failures.10 Active failures are the unsafe acts committed by people who are in direct contact with the patient or system, and latent conditions are the weaknesses in defence mechanisms created by designers, builders or management.

Also government agencies stress the importance of adequate equipment management.11 12 In addition, equipment is an important factor to be considered in OR scheduling.14 Equipment-related incidents are listed among the most common causes of delay in the OR, after the late arrival of surgeons or anaesthetists.15 16 Furthermore, many interruptions that were found in previous studies are related to equipment.17 18 As interruptions during surgery might lead to adverse events,19 20 streamlining all processes involving equipment will reduce risks by reducing the number of interruptions. We could not find any literature reporting on prospective inventories of equipment-related incidents, irrespective of nature or background, and its effect on continuity and safety of the operating room processes. This study sought to determine (1) the occurrence of equipment-related incidents in the OR, (2) the effect of these incidents on the continuity of the clinical process and (3) the underlying causes of these incidents.


Research setting

This study was performed in a large, non-academic teaching hospital in The Netherlands that performs approximately 30 000 surgical procedures a year. The hospital has two locations, and surgery is performed in both. The study focused on clinical ORs, and procedures performed in day care were not taken into account. Eighteen clinical ORs are available across both locations (8+10), and most ORs are dedicated to specific specialities. There is just one OR dedicated to emergency procedures, which was included in this study. The OR nurses work at both locations in a circulating system.

Data collection

All OR nurses were asked to fill in one registration form (see appendix 1) after each surgery procedure during a 4-week registration period in January–February 2009 (1580 procedures). Using this form, they registered the date, patient number and whether or not an equipment-related incident occurred. An equipment-related incident is defined as all activities with equipment that did not go according to plan. The combination of date and patient number made it possible to retrieve additional data (specialty, type of surgery procedure, OR number) from a database. When an incident was registered, additional questions were answered on the reverse side of the form. Here, information about the incident (time, type of incident, type of equipment involved; see table 1), consequences (extra work, delay, patient related) and probable causes were recorded.

Table 1

Definitions of equipment categories and incident categories with illustrative examples

The registration form was draughted and tested in a pilot study in cooperation with OR nurses to verify the practical and theoretical content; the methodological characteristics of the forms were not otherwise tested.

The registration forms were printed in a prominent colour and were present in each OR. After the forms were completed, they were returned to the secretary of the OR complex where they were picked up daily for processing. For the forms that were incomplete or unclear, emails or interviews (by phone or face to face) were used to retrieve the missing data or to clarify the registered incident.

In addition, the OR nurses were instructed to continue to register incidents in the blame-free reporting database in order to be able to compare the number and type of incidents in this database with the results of our study, as the management felt that there might be under-reporting in this database.

Data analysis

χ2 tests were used to determine whether there were any statistically significant differences in incidents between the two locations, specialities, etc (p<0.05).

Furthermore, a PRISMA analysis21 22 was used to analyse the causes of incidents that resulted in a delay of 15 min or more. These incidents were considered to be ‘serious’ by the hospital management. The PRISMA analysis consists of three steps: creating causal trees for the occurred incidents (using interviews with the OR nurses), categorising the root causes using the ECM model21 and suggesting interventions to reduce the occurrence or consequences of incidents.

The PRISMA method was supervised by the main author. The researcher did not follow any formal training but extensively studied all related literature and an instruction DVD. File access and staff interviews were used to retrieve the required data, and conclusions were verified by the involved staff and one of the coauthors (BJvdA) with extensive experience in equipment-related issues in the OR environment.

Finally, the data were compared with the data in the blame-free reporting database to verify the completeness of the data in both this study and the database itself.


Occurrence of equipment-related incidents

The final sample (representing a 57.7% response rate) included 933 registration forms representing 911 procedures (multiple incidents occurred during 15 procedures); 167 incidents are registered on these forms. Nineteen of these incidents, however, were excluded, as they were not equipment-related (5) or were reported repeatedly, as the problem (an air-conditioning system blowing very cold air) was not solved within a week (14; inclusion would distort the results). The resulting 148 incidents are included in this study, representing a registered incident percentage of 15.9% (table 2).

Table 2

Overall occurrence of registered equipment-related incidents (by hospital location)

The χ2 test did not show any significant differences in the occurrence of incidents between location A and B. The distribution of the incidents over the two locations, related to timing, equipment categories and incident types, is shown in table 3. The most common types of equipment involved in incidents were surgical instruments (46%), followed by medical devices (28%), facilitating equipment (16%) and materials (10%; see table 1 for definitions). Concerning the type of incident, 93% of the incidents could be categorised as ‘equipment unavailable’ (45%; often instruments) or ‘failing equipment’ (49%; often medical devices). Finally, incident percentages were above average for specialities using the most (advanced) equipment, such as neurology (26.4%), orthopaedics (20.8%), urology (20.5%) and thorax surgery (17.9%) (not in table).

Table 3

Occurrence of registered equipment-related incidents (by location)

Consequences of equipment-related incidents

The 148 incidents mentioned above caused a total of 29 h and 45 min of extra work for the OR nurses. Waiting time is not included in this number, defined as the time that OR nurses in the OR are actually waiting, without preparing a later phase of the procedure. On average, this results in extra work for the OR nurses of 12.1 min per recorded incident (SD=16.9). Seventy of these incidents (47.3%) eventually led to a delay (defined as the time that the entire procedure was halted) for the clinical process in the OR. The total amount of delay registered in this study in the OR was 12 h and 9 min (on average 5 min per incident, SD=9.9). The 15 ‘serious’ incidents (analysed using the PRISMA methodology) represented only 10% of the total number of incidents but resulted in 61% of the total registered delay (explaining the high SD for the average delay).

According to the OR nurses, none of the incidents directly resulted in physical harm. However, patients were affected indirectly by longer anaesthesia as a result of 29 incidents (19.6%) and postponed procedures as a result of two incidents (1.4%), so these incidents can be defined as adverse events.23 24 In the same period, only 10 equipment-related incidents were reported in the blame-free incident reporting system, of which only one related to a serious delay case. Six out of these 10 were also registered for the present study using the registration forms.

Causes for equipment-related incidents

The cause of an incident was often unknown to the responding OR nurse (27.7%). Failing equipment (21.6%) and incomplete instrument sets (14.2%) were the top categories for the incidents where the cause was determined. Other causes determined by OR nurses are misuse (6.1%), non-sterile equipment (5.4%), communication errors (4.1%), planning errors (1.4%) and causes that were listed only once (18.9%).

Causal trees were derived for 15 incidents that caused ‘serious’ delay (>15 min). Classifying all root causes resulted in the profile shown in table 4. An example of such an analysis is provided in figure 1. ‘Management Priorities’ is the category that is determined most often (13), followed by ‘Human intervention’(7) and ‘Materials’ (4). This ‘Management Priorities’ category as described by van Vuuren ‘Refers to failures resulting from management decisions in which safety is relegated to an inferior position when faced with conflicting demands or objectives.’21 In this study, we found incidents due to inventory capacity planning (8), scheduling issues (3) and the configuration of instrument sets (2). In all these cases, costs and productivity were factors that were prioritised by management above the risk of incidents.

Table 4

PRISMA profile of the 15 ‘serious’ incidents21 22*

Figure 1

Broken scopes leading to considerable delay and a cancelled procedure.

Conclusion and discussion

In this study, we have found that equipment-related incidents in the OR are a common phenomenon, occurring in up to 15.9% of surgery procedures. These incidents result on average in 12 min of extra work and 5 min delay per incident, affecting the continuity of the clinical process. Furthermore, we have found that decisions made by management have a considerable influence on the delay caused by equipment-related incidents. Finally, we found a large discrepancy between the number of incidents registered in this study and the blame-free reporting database, indicating serious under-reporting.

The incident percentage found in this study (15.9%) might not represent the actual occurrence due to the uncertainty caused by the response rate (57.7%). For both locations, there was a significant positive correlation (0.64 and 0.54, p<0.05) between this response rate and the number of registered incidents during a day. OR nurses were probably more motivated to fill in a form for procedures when confronted with an incident. Therefore, the actual occurrence is likely to be somewhat lower than the percentage of 15.9% that is found in this study but will be at least 9.4%.

As only the extra work for OR nurses was registered, the consequences in terms of extra work are probably underestimated. Additional work can be incurred for various departments such as planning, the medical technology department and nursing wards.

Although there was no dip in reported incidents in the blame-free reporting database during this research, it showed that only 10 equipment-related incidents were reported during this study, confirming that current incident reporting systems are used inconsistently.7 It is understandable that OR nurses were reluctant to register all incidents by blame-free reporting, as it consumes a considerable amount of time, and many incidents were only minor interruptions that did not harm the patient. However, a serious under-reporting was found for the ‘serious’ incidents as well (one out of 15 was registered). This suggests a considerable potential for improvement; if proper incident reporting and follow-up are realised this can result in a lower occurrence of incidents.25

For the 15 incidents causing a delay of 15 min or longer, multiple root causes were derived by conducting interviews (PRISMA analysis). Although 15 incidents is a relatively low number for an aggregated PRISMA analysis, the profile of classified root causes clearly distinguished the most important factors (table 4).

As a result of the PRISMA analysis, the hospital under review is advised to re-evaluate its inventory capacity of equipment (especially instruments). Furthermore, they are advised to re-evaluate the procedures for the sterilisation department, as many incidents were the result of incomplete (21) or non-sterile (seven) instrument sets. Lastly, we recommend that the hospital should consider renewing its procedures for reporting defective equipment, as two incidents were caused by defective equipment that had already caused problems but was not reported to other OR nurses. Methods to reduce incidents, such as a checklist including a time-out procedure26 and proper equipment maintenance,5 were already in place but did not seem to be watertight.

This study has some limitations. Assessing the representativeness of our findings for other hospitals requires further research. Furthermore, the response rate of 57.7% creates some uncertainty in the data resulting from the chosen method of registration by OR nurses. Direct observation by trained and independent researchers would have constituted an ideal method to validate the OR nurses' reports at the end of each case. However, this was not feasible due to time and cost restraints. It can be presumed that more, possibly less significant, incidents would have been reported, leading to higher figures than those presented here. Also, a higher percentage of ‘misuse’ would probably be reported, as is the case in other studies.5 8 It is also possible that the choice of registration by OR nurses, instead of surgeons or anaesthetists, creates a professional bias. The validity of the measurements was not formally tested; it is likely, though, that the instrument used is valid for this research purpose, as we encountered no questions from the OR nurses, and missing items in the questionnaire were very rare. Lastly, the PRISMA analysis of the most serious incidents provides a relevant overview of causes; in view of the scoring options, considerably larger numbers are, however, needed to present a stable profile of root causes.

Notwithstanding these limitations, the findings of this study provide insight into the occurrence and effect of equipment-related incidents. The effects of these incidents on extra work and discontinuity of clinical processes in the OR are not negligible, underlining the statement that this factor should be included in risk assessments for equipment.13

Future research should indicate if the results of this study can be confirmed in other hospitals as well. Research concerning the extra resources that are needed due to equipment-related incidents might also be very interesting—not only for the OR department, but for the entire organisation, as delays and waiting time seem to have a knock-on effect on other departments. Furthermore, research is needed into the most efficient and appropriate way to estimate the local risks concerning equipment failure, as incident reporting does not seem to suffice. From a methodological viewpoint, it is not yet clear whether a prospective risk analysis will completely cover the wide array of problems that can be encountered. Apart from human and organisational factors, equipment-related factors are one of the main causes of adverse events; equipment-related incidents occur with such frequency that further attention to its causes and effects seems justified.

Appendix 1 Registration form

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  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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