advances in intensive care medicine have enormously improved treatment of seriously ill patients . however , intensive treatment and prolongation of life is not always in the patient s best interest . thus , difficult decisions frequently need to be made about limitation of life - sustaining treatments ( lst ) . approximately 20% of patients die during or shortly after a stay in intensive care units ( icus ) . according to most previous studies , over 50% of all icu deaths previous surveys demonstrated that the limitation of lst ( e.g. , do - not - resuscitate ( dnr ) order , withholding and withdrawing therapy ) is a common practice when therapeutic measures are considered to be futile ; however , substantial international differences in end - of - life ( eol ) practices are reported [ 820 ] . beside other contributions , a highly important insight into eol decision making is provided by the ethicus study group , presenting important international comparisons on the issue and empirical assessments of the most important aspects of eol decision making [ 5,2123 ] . the limitation of lst is reported as being more common in northern european countries as compared to southern europe . unresponsiveness to therapy is reported as the most common primary reason for eol decision making . in addition , a more paternalistic pattern of eol decision making is characteristic for southern europe , with less communication with patients and their families , and the best interests of the patient are less commonly considered [ 5,2125 ] . national and international recommendations and guidelines were developed regarding limitation of lst in icus [ 2628 ] . currently , the national guidelines on eol decision making are being finalized in slovenia , because the issue is being increasingly recognized as important among physicians . thus , the main aim of the present study was to assess icu physician experiences with eol decision making . a cross - sectional study was conducted involving physicians from all 35 icus in slovenia ; we included all physicians who work regularly and/or perform overnight shifts in the icus . the study was approved by the slovene national medical ethics committee ( decision no.163/10/11 ) . the questionnaire was designed to assess the experiences of the participating icu physicians with eol decision making , focusing on limiting lst in the icus ( the term  limiting lst  included both withholding and withdrawing lst .  withholding was defined as not introducing additional treatment or not intensifying existing treatment , while  withdrawing  was defined as discontinuing a treatment that a patient was already undergoing . the first part of the questionnaire included questions on demographic characteristics of the participants , along with 3 questions assessing participant experiences with ethical committees . other questions were designed to assess participant experiences with discontinuation of treatment when it was deemed futile in icu patients . the questionnaires were personally distributed to all icus in slovenia . all icu heads and/or other available icu physicians the questionnaires were collected in sealed boxes placed in a room to which only icu staff had access . subsequently , 3 weeks after distribution , we personally collected all the submitted questionnaires . the distribution and collection of the questionnaires took place from november 2011 to february 2012 . fisher s exact test and fisher - freeman - halton test were used for analyzing contingency tables ; the significance level was set at p0.001 due to the large number of tested hypotheses . the analyses were performed using ibm spss statistics 20 ( ibm corp . , somers , ny , usa ) . a cross - sectional study was conducted involving physicians from all 35 icus in slovenia ; we included all physicians who work regularly and/or perform overnight shifts in the icus . the study was approved by the slovene national medical ethics committee ( decision no.163/10/11 ) . the questionnaire was designed to assess the experiences of the participating icu physicians with eol decision making , focusing on limiting lst in the icus ( the term  limiting lst  included both withholding and withdrawing lst .  withholding  was defined as not introducing additional treatment or not intensifying existing treatment , while  withdrawing  was defined as discontinuing a treatment that a patient was already undergoing . the first part of the questionnaire included questions on demographic characteristics of the participants , along with 3 questions assessing participant experiences with ethical committees . other questions were designed to assess participant experiences with discontinuation of treatment when it was deemed futile in icu patients . the questionnaires were personally distributed to all icus in slovenia . all icu heads and/or other available icu physicians the questionnaires were collected in sealed boxes placed in a room to which only icu staff had access . subsequently , 3 weeks after distribution , we personally collected all the submitted questionnaires . the distribution and collection of the questionnaires took place from november 2011 to february 2012 where appropriate , the averages and standard deviations ( sd ) were calculated . fisher s exact test and fisher - freeman - halton test were used for analyzing contingency tables ; the significance level was set at p0.001 due to the large number of tested hypotheses . the analyses were performed using ibm spss statistics 20 ( ibm corp . , somers , ny , usa ) . the responses from icu physicians from all 35 slovene icus are included in the study . altogether , 370 questionnaires were distributed ( the number approximately represented the total number of slovene icu physicians ) , and 267 questionnaires were returned ( the response rate was 72% ) . of the 260 total study participants , 134 ( 52% ) were males . participant age ranged from 27 to 68 years , with a median of 43.5 years ( sd 9.6 years ) . participants years of work as a physician ranged from 2 to 41 years , with a median of 17.8 years ( sd 9.6 years ) , and their years of work in the icu ranged from 0 to 38 years , with a median of 12.1 years ( sd 8.8 years ) . only 60% of study participants indicated they knew how to proceed when facing an ethical dilemma and only 23% of all participants had consulted the ethics committee . furthermore , 42% of the responders knew name of the ethics committee head in their institution , and 17% of them reported there was no ethics committee in their institution . most participants ( 90% ) had been involved in the decision making process regarding limitation of lst . in 2011 , 47% of them were involved 25 times , 20% 510 times , 20% more than 10 times , and 13% never . in the period 20062011 , 32% of them were involved more than 15 times , 25% 25 times , and 22% 510 times . the most common reasons for limitation of lst were terminal illness ( 62% ) , brain death ( 28% ) , and persistent vegetative state ( 7% ) . the decision making process regarding limitation of lst was in almost all cases ( 97% ) initiated by the physician ; in the remaining 3% the process was initiated by relatives of the patient . participate in decision making in 39% of cases , and nurses were reported to be  never  or  rarely most ( 63% ) participants had never encountered advanced directives in practice . not using any instructions regarding the limitation of lst was reported by 37% of participants , 32% used written instructions , and 31% used oral instructions . a special form to be used for limitation lst was used very rarely ( less than 0.5% of participants ) . in most cases ( 51% ) the decision to limit lst was implemented immediately after adopting it and communicating it to the relatives . within 6 hours from making the decision , it was implemented in 25% cases ; only rarely ( 4% ) did implementation take more than 24 hours . the study participants reported deciding more frequently to use a dnr order as compared to withholding of treatment ( 67% used a dnr order frequently  , whereas 48% used withholding of treatment  frequently  ; p<0.001 ) . detailed data on how frequently responders made decisions about different types of limitation of lst are presented in table 3 . with regard to the type of icu , the responders from medical icus used dnr orders more frequently as compared to the responders from surgical and/or pediatric icus ( p<0.001 ) . furthermore , board - certified icu physicians were more likely to use dnr orders  frequently  as compared to residents ( 71% vs. 52% ; p<0.001 ) . no other statistically significant differences among the compared groups were found when compared with their gender , working status , years of work , or knowledge about how to proceed when facing an ethical dilemma ( p = ns for all comparisons ) . the study participants reported deciding less frequently to withdraw mechanical ventilation or extubating patients as compared to withdrawal of inotropes or antibiotics ( 12% reported using withdrawal of mechanical ventilation or extubation  frequently  , and 66.7% used withdrawal of inotropes or antibiotics  frequently  ; p<0.001 ) . interestingly , only 3% of participants from surgical icus reported using withdrawal of mechanical ventilation or extubation  frequently  as compared to approximately 20% in medical and pediatric icus ( p<0.001 ) . no other statistically significant differences in the frequency of use of withdrawal of antibiotics or inotropes among the compared groups were found when compared with regard to their gender , working status , years of work , or knowledge about how to proceed when facing an ethical dilemma ( p = ns for all comparisons ) . termination of hydration was reported to be only rarely used in slovene icus , and 76% of participants reported never terminating it ( table 3 ) . termination of hydration was most used by physicians from medical icus ( 9.9% ) as compared to 3.1% at the surgical icus and to 0% at the pediatric icus ; however , the differences were slightly above the threshold of statistical significance ; p=0.018 ) . the responses from icu physicians from all 35 slovene icus are included in the study . altogether , 370 questionnaires were distributed ( the number approximately represented the total number of slovene icu physicians ) , and 267 questionnaires were returned ( the response rate was 72% ) . of the 260 total study participants , 134 ( 52% ) were males . participant age ranged from 27 to 68 years , with a median of 43.5 years ( sd 9.6 years ) . participants years of work as a physician ranged from 2 to 41 years , with a median of 17.8 years ( sd 9.6 years ) , and their years of work in the icu ranged from 0 to 38 years , with a median of 12.1 years ( sd 8.8 years ) . only 60% of study participants indicated they knew how to proceed when facing an ethical dilemma and only 23% of all participants had consulted the ethics committee . furthermore , 42% of the responders knew name of the ethics committee head in their institution , and 17% of them reported there was no ethics committee in their institution . most participants ( 90% ) had been involved in the decision making process regarding limitation of lst . in 2011 , 47% of them were involved 25 times , 20% 510 times , 20% more than 10 times , and 13% never . in the period 20062011 , 32% of them were involved more than 15 times , 25% 25 times , and 22% 510 times . the most common reasons for limitation of lst were terminal illness ( 62% ) , brain death ( 28% ) , and persistent vegetative state ( 7% ) . the decision making process regarding limitation of lst was in almost all cases ( 97% ) initiated by the physician ; in the remaining 3% the process was initiated by relatives of the patient . participate in decision making in 39% of cases , and nurses were reported to be  never  or  rarely not using any instructions regarding the limitation of lst was reported by 37% of participants , 32% used written instructions , and 31% used oral instructions . a special form to be used for limitation lst was used very rarely ( less than 0.5% of participants ) . in most cases ( 51% ) the decision to limit lst was implemented immediately after adopting it and communicating it to the relatives . within 6 hours from making the decision , it was implemented in 25% cases ; only rarely ( 4% ) did implementation take more than 24 hours . the study participants reported deciding more frequently to use a dnr order as compared to withholding of treatment ( 67% used a dnr order  frequently  , whereas 48% used withholding of treatment  frequently  ; p<0.001 ) . detailed data on how frequently responders made decisions about different types of limitation of lst are presented in table 3 . with regard to the type of icu , the responders from medical icus used dnr orders more frequently as compared to the responders from surgical and/or pediatric icus ( p<0.001 ) . furthermore , board - certified icu physicians were more likely to use dnr orders  frequently  as compared to residents ( 71% vs. 52% ; p<0.001 ) . no other statistically significant differences among the compared groups were found when compared with their gender , working status , years of work , or knowledge about how to proceed when facing an ethical dilemma ( p = ns for all comparisons ) . the study participants reported deciding less frequently to withdraw mechanical ventilation or extubating patients as compared to withdrawal of inotropes or antibiotics ( 12% reported using withdrawal of mechanical ventilation or extubation  frequently  , and 66.7% used withdrawal of inotropes or antibiotics  frequently  ; p<0.001 ) . interestingly , only 3% of participants from surgical icus reported using withdrawal of mechanical ventilation or extubation  frequently  as compared to approximately 20% in medical and pediatric icus ( p<0.001 ) . no other statistically significant differences in the frequency of use of withdrawal of antibiotics or inotropes among the compared groups were found when compared with regard to their gender , working status , years of work , or knowledge about how to proceed when facing an ethical dilemma ( p = ns for all comparisons ) . termination of hydration was reported to be only rarely used in slovene icus , and 76% of participants reported never terminating it ( table 3 ) . termination of hydration was most used by physicians from medical icus ( 9.9% ) as compared to 3.1% at the surgical icus and to 0% at the pediatric icus ; however , the differences were slightly above the threshold of statistical significance ; p=0.018 ) . this is the first study to assess the experiences of slovene icu physicians with eol decision making . prior to this study , slovenia had not taken part in any of the international studies on eol decision making . completed questionnaires were obtained from all 35 slovene icus , which included pediatric , medical , and surgical icus . altogether , responses from approximately three - quarters of all the slovene icu physicians were included , making the study fairly representative of the population . in most previous survey studies however , few previous studies include all the national icus or compared different types of icus . we are aware of different approaches towards defining the term  futility  as reported by schneiderman , pellegrino , and others [ 3033 ] . since , according to the literature , no general agreement exists on the definition of the term  futility  , we left the definition of the term to the icu physicians own understanding of the term . thus , in our study , we were interested about eol decision making from the point at which any further treatment was assessed as futile by involved clinicians . the proportions of physicians who reported using withholding ( 94% ) or withdrawing ( 86% for antibiotics and 95% for inotropes ) lst were comparable to or even higher than in most of the previous national and international surveys . however , we observed substantial differences in reported frequencies of using different measures of limitation of lst . the dnr order was reported to be even slightly more frequently used ( by 97% icu physicians ) than withholding of treatment . furthermore , it was shown to be more frequently used in the medical icus as compared to surgical and pediatric icus . similarly , a recent german survey shows the dnr order is the most common measure of limitation of lst , followed by withdrawal of inotropes , hemodialysis , and antibiotics . not surprisingly , withdrawal of inotropes ( 95% ) or of antibiotics ( 86% ) was reported to be much more frequently used than withdrawal of mechanical ventilation ( 51% ) or of extubation ( 27% ) . this is in line with some previous studies showing that extubation especially is quite rarely performed . ( e.g. , withdrawal of inotropes or antibiotics ) and the  hard  ( e.g. , extubation or withdrawal of mechanical ventilation ) measures of withdrawal of lst , in line with the fact that the first were reported to be much more commonly used than the later . the  soft  measures might thus be preferable for the icu physicians from a practical point of view , despite no difference or even some opposite claims with regard to the ethical point of view found in the literature . nevertheless , also most previous surveys indicated that withdrawal of therapy is more difficult for icu physicians than withholding therapy . interestingly , extubation or withdrawal of mechanical ventilation were reported to be more regularly used in pediatric and medical icus , but only very rarely in surgical icus , but the reason is not clear . furthermore , when compared to the ethicus study  despite its geographic positioning and its cultural roots in central europe slovenia seems to be more similar to southern european countries regarding extubation or the withdrawal of mechanical ventilation . the decision making process regarding limitation of lst was reported to be almost always initiated by the icu physician . the decision was reported to be usually taken at a meeting of the involved physicians . furthermore , merely 17% of icu physicians reported always including patients and/or relatives in eol decision making (  never  or  rarely involved in the eol decision making process by 84% of physician respondents , which is quite concerning . this all indicates a rather paternalistic pattern of eol decision making , which is more characteristic of southern european countries . our study confirmed the previous impressions from icu clinical practice that advance directives were only very rarely used , and most of our participants had not encountered a single one , despite their potential clinical significance in decision making . this is in concordance with some previous studies , which showed that advance directives were available for fewer than 5% of patients in all countries apart from the netherlands . this could be due to the restrictiveness of current slovenian law on advance directives , which has several procedural preconditions for their use to be valid and are binding for physicians only in situations in which treatment is clearly futile . termination of hydration was reported to be only rarely used in slovene icus , with 76% of participants never terminating it . however , differences were found among icus : hydration was most frequently terminated by participants from medical icus ( 9.9% ) , and more rarely by those from surgical icus ( 3.1% ) and never by those from pediatric icus . similarly , in a german study , termination of hydration was reported by 35% of physicians . the eureld study in 6 european countries showed that hydration is most frequently terminated in the netherlands ( 11% ) and least frequently in italy ( 2.6% ) . finally , merely 60% of the icu physicians reported knowing how to proceed when facing an ethical dilemma , which indicates a need to strengthen medical ethics education and infrastructure , which would be especially important for icus , in which ethical dilemmas appear on a daily basis . this main limitation of this study is that the questionnaire only indirectly measured the real situation in the icus regarding eol decision making . on the other hand , it presents the first national data on this very important issue in slovenia and could serve as a solid basis for preparation of national guidelines , as well as being the basis for developing further observational studies of eol decision making in icus . this was the first nation - wide study on experiences with eol decision making in slovene icu physicians . firstly , we found the limitation of lst to be ethically acceptable to icu physicians . most widely practiced was dnr order , followed by the withholding of treatment . in addition , we found differences in reported frequencies of using  soft ( e.g. , withdrawal of inotropes or antibiotics ) and  hard  ( e.g. , furthermore , termination of hydration was reported to be only rarely used , mostly in the medical icus . in addition , advance directives were almost non - existent in practice , and the patients relatives and nurses only infrequently participated in eol decision making . finally , better medical ethics education and infrastructure should be developed for icus and hospitals .
backgroundadvances in intensive care medicine have enormously improved ability to successfully treat seriously ill patients . however , intensive treatment and prolongation of life is not always in the patient s best interest , and many ethical dilemmas arise in end - of - life ( eol ) situations . 
 we aimed to assess intensive care unit ( icu ) physicians experiences with eol decision making and to compare the responses according to icu type.material/methodsa cross - sectional survey was performed in all 35 slovene icus , using a questionnaire designed to assess icu physician experiences with eol decision making , focusing on limitations of life - sustaining treatments ( lst).resultswe distributed 370 questionnaires ( approximating the number of slovene icu physicians ) and 267 were returned ( 72% response rate ) . 
 the great majority of icu physicians reported using do - not - resuscitate ( dnr ) orders ( 97% ) , withholding lst ( 94% ) , and withdrawing antibiotics ( 86% ) or inotropes ( 95% ) . 
 fewer icu physicians reported withdrawing mechanical ventilation ( 52% ) or extubating patients ( 27% ) . 
 hydration was reported to be only rarely terminated ( 76% of participants reported never terminating it ) . in addition , 63% of participants had never encountered advance directives , and 39% reported to  never  or  rarely  participating in decision making with relatives of patients . 
 nurses were reported to be  never  or 
 rarely  involved in the eol decision making process by 84% of participants.conclusionslimitation of lst was regularly used by slovene icu physicians . 
 dnr orders and withholding of lst were the most commonly used measures . 
 hydration was only rarely terminated . 
 in addition , use of advance directives was almost non - existent in practice , and the patients relatives and nurses only infrequently participated in the decision making .