Background Studies suggest that a majority of elderly patientswould want to undergo cardiopulmonary resuscitation (CPR) ifthey had a cardiac arrest. Yet few studies have examined theirpreferences after clinicians have informed them about the outcomesof CPR.
Methods To study older patients' preferences regarding CPR,we interviewed as many ambulatory patients as possible in onegeriatrics practice in Denver from August 1, 1991, through July31, 1992.
Results A total of 371 patients at least 60 years of age wereeligible; 287 completed the interview (mean age, 77 years; range,60 to 99). When asked about their wishes if they had cardiacarrest during an acute illness, 41 percent opted for CPR beforelearning the probability of survival to discharge. After learningthe probability of survival (10 to 17 percent), 22 percent optedfor CPR. Only 6 percent of patients 86 years of age or olderopted for CPR under these conditions. When asked about a chronicillness in which the life expectancy was less than one year,11 percent of the 287 patients opted for CPR before learningthe probability of survival to discharge. After learning theprobability of survival (0 to 5 percent), 5 percent said theywould want CPR.
Conclusions Older patients readily understand prognostic information,which influences their preferences with respect to CPR. Mostdo not want to undergo CPR once a clinician explains the probabilityof survival after the procedure.
Cardiopulmonary resuscitation (CPR) is controversial for patientsnear death. The appropriateness of CPR depends on three mainfactors: the outcome, the cost, and the patient's preference.Several recent studies have reported outcomes among elderlypatients who have undergone CPR. Ambulatory elderly patientshave a 10 percent chance of surviving to discharge after out-of-hospitalCPR in cities with good emergency medical systems1,2. A recentstudy suggests that carefully selected elderly patients (i.e.,those with primary cardiac diseases) have an up to 39 percentchance of surviving to discharge after CPR is performed in thehospital3. Depending on the severity of their illness, chronicallyill elderly patients have a very poor chance of surviving todischarge after CPR (less than 5 percent)4,5,6,7,8.
Although we are unaware of any studies of the cost effectivenessof CPR, estimates suggest that the marginal cost-effectivenessratio is very high when the probability of survival is low9,10,11.
Several investigators have reported on older patients' preferenceswith respect to CPR. Empirical research based on standardizedsurveys shows that the majority of elderly patients desire toundergo CPR in the event of a cardiac arrest. Some studies haveindicated that 73 to 90 percent of elderly outpatients wouldwant CPR, given their current state of health12,13,14,15. Onlyone study indicated that a small minority (less than 10 percent)would want CPR16. From 43 to 88 percent of hospitalized elderlypatients opt for CPR17,18,19. A recent study found that 84 percentof frail patients in an acute care geriatric-medicine unit favoredthe use of CPR in their own cases20. Approximately one thirdof nursing home residents (or their surrogates) chose CPR21,22.When patients consider whether they would want to undergo CPRif they had a serious disability, such as coma or a terminalillness, 20 to 45 percent opt for CPR12,13,14,19,23,24,25,26.
The percentage of elderly patients in these studies who saythey would want to undergo CPR is much higher than our impressionof what we would find in our geriatrics practice. These differencesmay be accounted for by bias on the part of the interviewer,by differences in the patients' knowledge about prognosis,27,28or by both factors.
Our goal was to study the effect of these factors on older patients'preferences regarding CPR. First, we wanted to determine patients'preferences when they were elicited by clinicians instead ofresearchers. Second, we wanted to determine the effect of prognosticinformation on patients' preferences with respect to CPR.
Methods
We developed a questionnaire based on a pilot study of 80 olderpatients (age range, 66 to 93 years) who lived in a retirementcommunity in Washington, D.C. After revising the questionnaire,we made an attempt to interview all ambulatory patients in thegeriatrics practice of one of us in Denver from August 1, 1991,through July 31, 1992. This practice is part of a large, hospital-basedgeriatrics clinic in downtown Denver.
The interviewers were the geriatrician, a geriatric nurse practitioner,and 11 medical residents who were supervised by the geriatrician.
We conducted the interviews as part of a general discussionof advance directives for health care. If time allowed, we discussedadvance directives (and conducted the interview) at the endof a routine office visit in which we addressed other medicalproblems. Otherwise, we scheduled a return visit to focus onadvance directives.
The first set of questions addressed the patients' knowledgeof CPR. We explained CPR to those who did not have a basic understandingof the procedure. The second set of questions was designed todetermine the patients' estimates of the probability of survivalafter CPR and their preferences regarding the use of CPR ifthey had a cardiac arrest. We asked about CPR in three differentsets of circumstances: an accident, an acute medical illness,and a chronic illness associated with a life expectancy of lessthan one year.
In the third set of questions, we used pie charts to determinethe probability of survival at which patients would opt forCPR. We began by showing them a pie chart depicting a 50 percentchance of survival after CPR (Figure 1). We asked them to focusfirst on the 50 percent who would survive; we explained thatthe vast majority of the survivors would resume their usualactivities and that only a very small minority would requirelong-term care because of neurologic problems. We then askedthem to focus on the 50 percent who would die in the hospital,explaining that many would die within the first 48 hours withoutever regaining consciousness. We explained that others woulddie after regaining consciousness and after a longer hospitalcourse.
Figure 1. Pie Chart Showing 50 Percent Survival after CPR.
This pie chart and similar charts showing different survival rates were used in the interviews with patients to elicit their preferences with respect to the use of CPR.
After we were confident that the patients understood the 50-50pie chart, we showed them a chart depicting a 1 percent chanceof surviving to leave the hospital. We asked if they would wantCPR if this was their chance of surviving. If they said yes,we proceeded to the next series of questions. If they said no,we proceeded to the next pie chart, one depicting a 5 percentchance of surviving to discharge. Subsequent charts depictedincreasing chances of surviving to leave the hospital. We continuedshowing charts until the patients said they would want CPR oruntil we showed a pie chart depicting 100 percent survival.
The last set of questions was identical to the second set, inwhich we asked about patients' preferences with respect to CPRin three different sets of circumstances. The difference wasthat we informed them of the probability of survival after CPRin two of the cases. We explained that the chance of survivingto discharge after CPR for patients with acute medical problemsranged from 10 percent to 17 percent1,2,6,8,29,30. In the caseof a chronic illness associated with a life expectancy of lessthan one year, the chance of surviving to discharge ranged from0 to 5 percent4,5,6,7,8.
Statistical Analysis
We used the Crunch Statistical Package31 to analyze the data.We analyzed continuous variables with Student's t-test and categoricalvariables with the chi-square test.
Results
Patients
A total of 371 patients at least 60 years of age were eligible;287 completed the interview (mean age, 77 years; range, 60 to99). Eighty-four patients were unable to participate for thefollowing reasons: dementia (13 patients), psychiatric problems(8 patients), acute medical problems (20 patients), loss tofollow-up (19 patients), an incomplete interview (14 patients),and miscellaneous reasons such as a language barrier (10 patients).Table 1 shows the characteristics of the 287 patients who completedthe interview.
Table 1. Characteristics of the 287 Patients Who Were Interviewed.
Knowledge of CPR and Experience with Intensive Care
The clinicians judged that 60 percent of the subjects had areasonable understanding of CPR. Sixteen percent had seen CPRperformed, and 23 percent knew of someone who had undergoneit. Thirty-nine percent had a close friend or relative who haddied in the intensive care unit.
Estimated Probability of Survival after CPR and Preferences for CPR
Table 2 shows the patients' estimates of the chance of survivingafter CPR, the percentage who opted for CPR before learningthe true probability of survival to discharge, and the percentagewho opted for CPR after learning the true probability. Approximatelyhalf the patients who had initially opted for CPR decided notto undergo CPR when they learned the probability of survival.
Table 2. The 287 Patients' Estimates of the Probability of Survival after CPR and Preferences Regarding CPR.
Once patients understood the probability of surviving to discharge,only 6 percent of those over 85 years of age (2 of 34) saidthey would want to undergo CPR if they had an acute illness.Only 1 of the 34 patients over 85 years of age (3 percent) saidCPR would be desirable in the case of a chronic illness associatedwith a life expectancy of less than a year.
Table 3 shows the minimal probability of survival to dischargeat which our patients said they would want CPR. Only 42 percentsaid they would want to undergo CPR if the chance of survivingto leave the hospital was less than 50 percent. Twenty-fivepercent said they would not want CPR even if the chance of survivingwas 100 percent.
Table 3. Lowest Probability of Survival at Which Patients (N = 287) Would Prefer to Undergo CPR.
The patients were consistent in their responses when the twomethods of determining their preferences regarding CPR wereused (determining a threshold for the survival rate using piecharts and answering a straightforward question). Only 4 percentgave inconsistent responses. The results of these analyses werethe same whether the interview was conducted by the geriatrician(as was the case for approximately 50 percent of the interviews)or by the nurse practitioner or a medical resident.
Discussion
In a busy outpatient geriatrics practice, we found that detaileddiscussions of CPR with patients were necessary before we couldreliably determine their preferences regarding CPR. A recentstudy by Mower and Baraff indicated that the most compellingdirectives (that is, those most likely to be followed by doctors)are detailed32.
Our study focused on CPR. We believed that patients' preferenceswould be more valid if they were based on a good understandingof the technique. We used several methods to increase our patients'understanding of CPR.
First, the interviewers were clinicians. Although the cliniciansfollowed the questionnaire, they could use their clinical skillsto clarify concepts and explore inconsistencies in responses.Some might argue that the participation of a clinician introducesbias and that this approach may be less likely than others toelicit patients' true preferences. We believe the effects ofsuch bias were minimal, however, for several reasons. The cliniciansdeviated from the questionnaire only to clarify matters andexplore inconsistencies, not to express their own opinions.The results were the same whether the patients were interviewedby the geriatrician, who had definite views on the use of CPR,6,9,33or by a medical resident or the nurse practitioner. Finally,patients make important decisions after considering the adviceof clinicians, not in a vacuum. Had the clinicians in this studyexpressed their own views34,35 -- as they might have if thequestionnaire had not been part of the study -- fewer patientsmight have opted for CPR.
Second, we used a visual representation of the probability ofsurvival after CPR to increase patients' understanding of theprocedure. The pie charts illustrated both mortality and survivalrates, thus reducing the possibility of a framing bias (i.e.,influencing responses by presenting only mortality or survivalrates)36,37. Almost all the patients were able to understandthe charts.
Prognostic information is essential for the accurate preparationof advance directives. The patients in our study and others27,28overestimated the likelihood of survival after CPR. This optimisticview of the outcome of CPR may explain why a large percentageof older patients in other studies opted for CPR12,13,14,15.In our study, half the patients who initially said they wantedCPR changed their minds after they learned the true probabilityof survival. Miller et al. reported a similar change in preferenceswhen older patients received information about the probabilityof survival after CPR27. On the other hand, Schonwetter et al.found that preferences regarding CPR did not change when elderlyveterans considered the probability of survival after the procedure12.The "fixed" preferences reported in that study may be uniqueto elderly veterans. A more recent report from Schonwetter etal.28 suggests that older patients do change their preferenceswith respect to CPR after learning about the outcomes of theprocedure.
The patients in our study received the same information aboutthe outcomes of CPR as the subjects in previous studies27,28.However, the percentage of older patients who opted for CPRafter learning the actual probability of survival was much lowerin our study (22 percent said they would choose CPR if theyhad an acute illness) than in others (38 to 40 percent)27,28.Unlike the previous studies, ours incorporated the questionnaireinto a routine office visit. The interviewers were the clinicianswho took care of the patients. We assume that this format hadsome influence on our patients' preferences. Furthermore, webelieve the preferences expressed in the context of a trustingprovider-patient relationship may be more valid than those expressedin anonymous surveys or when the interviewer has no relationshipwith the subject.
The third method we used to increase patients' understandingof CPR was the detailed description of outcomes. Patients needto know more than the odds of dying or living after undergoingCPR. They wonder what the quality of life might be for survivorsof CPR or what kind of death CPR would involve. We believe adescription by a clinician is the most effective and efficientway of communicating that information.
The format of our study provided an opportunity for us to clarifymany misperceptions. For example, many patients thought thatthey would "end up like a vegetable" if they survived CPR. Weemphasized that the majority of survivors resume their usualdaily activities and that only a small minority require long-termcare because of neurologic deficits. Similarly, many patientsthought that death after CPR would be painful. We emphasizedthat most people who die after CPR do not regain consciousnessand therefore feel no pain during CPR or during subsequent intensivecare. Although we did not determine how much this informationinfluenced the patients' preferences, we believe it had someeffect.
The patients in this study had little difficulty stating thesurvival rate at which CPR was acceptable to them. A few waveredbetween 1 percent and 5 percent, between 10 percent and 20 percent,or between 40 percent and 50 percent. None wavered between ratesdiffering more widely, such as 1 percent and 20 percent or 10percent and 50 percent. With the exception of two patients whocould not grasp the probabilities in the pie charts, all hadfairly well defined thresholds for preferring CPR. This patternindicates that the probability of survival is an important factorin patients' preferences. Although we focused on CPR, we believea similar approach could be used to help clarify preferencesregarding intensive care in general.
Various questionnaires and forms are available to help patientsprepare advance directives. The medical directive of Emanueland Emanuel38 helps patients consider their wishes in situationswith different levels of disability. We agree that scenarios(and, if time allows, stories39) are helpful in determiningpatients' preferences. Other materials can help patients expresstheir opinions about states worse than death40. The durationof treatment is another important factor18. All these factorsare related to prognosis. The variable we studied -- the probabilityof survival -- is only one component of a patient's prognosis.
A detailed advance directive, therefore, appears to be one thatincorporates different scenarios, takes into account the durationof treatment, and specifies the survival rate below which intensivecare is not worth it for that patient. Such a directive mayseem cumbersome. Our impression is that clinicians can gleanthis information in about 10 to 15 minutes of discussion withmost older patients. It may take as little as two to five minutesin some cases. Furthermore, we believe that most clinicianscan obtain this information -- and summarize the salient pointsin the record -- without needing to use a particular questionnaireor form. However, a questionnaire that patients can fill outat home, then discuss with their doctors, would be very useful.Its use might help patients and their doctors overcome one ofthe most important barriers to completing advance directives-- procrastination41.
The great majority of the oldest patients (about 94 percentof those over 85 years of age in our practice) do not want CPRwhen they understand the probability of survival after the procedure.Would the percentages be even higher if patients consideredall pertinent factors, including the financial effect of prolongedcare on their family and on society42,43,44? On the basis ofcomments from the patients in our study, we think so.
Summary
Optimal care for older patients includes advance directives.Standard forms such as living wills and durable powers of attorneymay be helpful but are often insufficient. Discussions amongthe patient, a clinician, and potential surrogate decision makersyield the most valid advance directives. These discussions shouldinclude prognostic information. Patients readily understandthis information, which influences their preferences regardingCPR. Most older patients do not want CPR once they understandthe probability of survival after the procedure.
We are indebted to Robert Jayes, M.D., and Joanne Lynn, M.D.,for their help in designing the questionnaire; to Arif Rohilla,M.D., Brian Kosiak, M.D., Henry Raymundo, M.D., Jasmine Joseph,M.D., Farid Khan, M.D., Dawn Hutchinson, M.D., Sharman Hurlow,M.D., Robert Henson, M.D., Kristine Hembre, M.D., Alice Brunecky,M.D., and Richard Beasley, M.D., for interviewing the patients;and to Beth Barbour for assistance in the preparation of themanuscript.
Source Information
From the Senior Citizen's Health Center, Presbyterian-St. Luke's Medical Center, Denver (D.J.M., D.B., S.S.), and the Department of Health Care Sciences and the Intensive Care Unit Research Unit, George Washington University Medical Center, Washington, D.C. (A.W.K., S.T., B.K., J.T.).
Address reprint requests to Dr. Murphy at the Senior Citizen's Health Center, Presbyterian-St. Luke's Medical Center, 1801 High St., Denver CO 80218.
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