Quality of Care in Anesthesia
Introduction
Nurse anesthetists have been providing quality anesthesia care in the United States for more than 100 years. In administering more than 65 percent of the anesthetics given annually, CRNAs have compiled an enviable safety record. No studies to date that have addressed anesthesia care outcomes have found that there is a significant difference in patient outcomes based on whether the anesthesia provider is a CRNA or an anesthesiologist.
The practice of anesthesia has become safer in recent years due to improvements in pharmacological agents and the introduction of sophisticated technology. Recent studies have shown a dramatic reduction in anesthesia mortality rate to approximately one per 250,000 anesthetics.
That there is no significant difference regarding the quality of care rendered by anesthesiologists and CRNAs "may be surprising to the less knowledgeable, an understanding of the nature of anesthesia would lead one to expect this. The vast majority of anesthesia-related accidents have nothing to do with the level of education of the provider." [Blumenreich GA, Wolf BL. "Restrictions on CRNAs imposed by physician-controlled insurance companies." AANA Journal. 1986;54:6:538-539, at page 539.]
The most common anesthesia accidents are lack of oxygen supplied to the patient (hypoxia), intubation into the esophagus rather than the trachea, and disconnection of oxygen supply to the patient. All of these accidents result from lack of attention to monitoring the patient, not lack of education. In fact, the Harvard Medical School standards in anesthesia are directed toward monitoring, which reiterates the basic point - most anesthesia incidents relate to lack of attention to monitoring the patient, not lack of education.
As Blumenreich has stated:
Anesthesia seems to be an area where, beyond a certain level, outcome is only minimally affected by medical knowledge but is greatly affected by factors such as attention, concentration, organization and the ability to function as part of a team; factors towards which all professions strive but which no profession may claim a monopoly. See id. at page 539
Section One
Summary of Pertinent Quality of Care Studies and Data
1. Bechtoldt Study
[Bechtoldt, Jr, AA. "Committee On Anesthesia Study. Anesthetic- Related Deaths: 1969-1976." North Carolina Medical Journal. 1981;42:253-259.]
A. Background
A 10-member Anesthesia Study Committee (ASC) of the North Carolina Medical Society reviewed approximately 900 perioperative deaths in that state over the eight-year period from 1969 to 1976. The ASC determined that 90 perioperative deaths were, to a certain extent, related to the administration of an anesthetic. The ASC did not study types of anesthesia-related outcomes other than death. Based on an ASC survey of hospitals, the ASC estimated that more than two million anesthetics were administered in North Carolina from 1969 to 1976.
The ASC defined "anesthetic-related" deaths as those in which the ASC determined that anesthesia was found to be a) the sole cause of death or b) the major contributing factor.
In categorizing cases, the ASC used information from death certificates and questionnaires completed by anesthesia providers of record. Based on that data, the ASC estimated that there had been one anesthetic-related death per 24,000 anesthetics administered.
The ASC used six different criteria to review the cases, including the following:
type of anesthetic involved
location where anesthesia was administered within the facility
type of practitioner(s) involved in anesthesia administration
surgical procedure or operation
patient risk classification
B. Comparison of Outcome According to Provider Type
The ASC classified those who had administered anesthesia as follows:
Certified Registered Nurse Anesthetist (CRNA) working alone
anesthesiologist working alone
CRNA and anesthesiologist working together
surgeon or dentist
unknown (in some of the cases, the type of practitioner administering the anesthetic was not identifiable based upon the information available to the ASC)
Bechtoldt reported that the ASC:
... found that the incidence among the three major groups (the CRNA, the anesthesiologist, and the combination of CRNA and anesthesiologist) to be rather similar. Although the CRNA working alone accounted for about half of the anesthetic-related deaths, the CRNA working alone also accounted for about half of the anesthetics administered. [page 257] [emphasis added]
Bechtoldt stated that the ASC's study included patients representing all risk categories. The study did not, however, address whether particular types of anesthesia providers (i.e., anesthesiologists or CRNAs) tended to encounter patients having particular risk factors. Because CRNAs working alone provided approximately half of the nearly two million anesthetics administered in the state during the period of the study, it is reasonable to believe CRNAs provided care to patients covering the full spectrum of physical status and anesthetic risk.
2. Forrest Study
[Forrest, WH. "Outcome - The Effect of the Provider." In: Hirsh, R, Forrest, WH, et al., eds. Health Care Delivery in Anesthesia. Philadelphia: George F. Stickley Company. Chapter 15.1980:137-142.]
Forrest reviewed data that had been collected as part of an intensive hospital study of institutional differences that the Stanford Center for Health Care Research conducted. Forrest analyzed mortality and severe morbidity outcome data from 16 randomly selected hospitals, controlling for case-mix variations. The data concerned 8,593 patients undergoing 15 surgical procedures over a 10-month period (May 1973 through February 1974). Using that data, Forrest compared outcomes based upon type of anesthesia provider.
For study purposes, the hospitals were classified as having either:
1. primarily physician (anesthesiologist) providers (9 hospitals), or
2. primarily nurse anesthetist providers (7 hospitals).
Each of the 8,593 patients were "weighted" to reflect the progression or stage of disease at the time of surgery, and "the probability of developing postoperative morbidity and mortality, given the stage of the patient's disease." Forrest initially compared actual patient outcome to the outcome that would have been predicted based upon the patient's preoperative health status and the surgery performed. Compared with outcomes predicted, the actual results showed no significant difference in outcome between facilities having primarily nurse anesthetists or those having primarily physician anesthesiologists.
Forrest then looked at the data using three scales that differed based on definitions of "morbidity" applied to each scale. Slight differences between the two groups (i.e., primarily nurse anesthetist, or primarily anesthesiologist) were found, but the favored group varied according to the analysis criteria employed. That is, depending on criteria, sometimes the anesthesiologist-dominated group showed better outcomes, and sometimes the nurse anesthetist-dominated group fared better. After applying statistical tests to the results, Forrest stated:
Thus, using conservative statistical methods, we concluded that there were no significant differences in outcomes between the two groups of hospitals defined by type of anesthesia provider. Different methods of defining outcome changed the direction of differences for two weighted morbidity measures. [page 141] [emphasis added]
The Forrest study was presented at a 1977 symposium sponsored by the Association of University Anesthetists; the symposium dealt with the broader subject of "Epidemiology and Demography of Anesthesia." Official comments concluding this anesthesiologist-dominated proceeding (Chapter 25 of Health Care Delivery in Anesthesia, cited above) showed that the findings of Dr. Forrest, as well as others researching provider aspects of outcomes, caught some of the symposium participants off guard. As one commenter stated:
It was surprising that the stage of training of the anesthesiologist or administration of an anesthetic by a nurse anesthetist or anesthesiologist seemed to affect risk very little.... [page 220]
Still another physician commenter, who was chair of a university-based anesthesia department, articulated a reaction possibly shared by many of his colleagues in academia:
Dr. Forrest's very carefully done study showed no difference in outcome whether the provider was a nurse anesthetist or an anesthesiologist.... If we had to accept the data that there are no differences in outcome between anesthetics administered by anesthesiologists compared to nurse anesthetists, the consequences would be truly extraordinary. It would mean that we would have to question our very careers; we would have to question the value of anesthesia residency training programs; we would have to question organization in hospitals; we would have to question and reexamine projections for manpower needs in the future; we would have to question medical economics as they are projected right now. With some of the data presented to us [during the full symposium] we were very comfortable because they matched expectations... Now in the study comparing nurse anesthetists and anesthesiologists, we do not have this comfort. [pages 223-224]
3. Minnesota Department of Health Study
In 1994, the Minnesota Department of Health (DOH), as mandated by the state Legislature, studied the provision of anesthesia services by CRNAs and anesthesiologists. The department reached four conclusions, including the following:
There are no studies, either national in scope or Minnesota- specific, which conclusively show a difference in patient outcomes based on type of anesthesia provider. [page 23, DOH study.] [emphasis added]
4. Centers for Disease Control
In 1990, the federal Centers for Disease Control (CDC) considered undertaking a multimillion-dollar study regarding anesthesia outcomes. Following a review of anesthesia data from a pilot study issued by the CDC and the Battelle Human Affairs Research Centers, however, the CDC concluded that morbidity and mortality in anesthesia was too low to warrant a broader study. The pilot study, published on December 1, 1988, was entitled, "Investigation Of Mortality and Severe Morbidity As- sociated With Anesthesia: Pilot Study." The pilot study stated that:
To obtain regional estimates of rates of mortality and severe morbidity totally associated with anesthesia with a precision of about 35% a nationwide study consisting of 290 hospitals should be selected. This size study would cost approximately 15 million dollars spread over a 5-year period.
5. National Academy of Sciences Study
This study was mandated by the U.S. Congress and performed by the National Academy of Sciences, National Research Council. The report to Congress stated: 'There was no association of complications of anesthesia with the qualifications of the anesthetist or with the type of anesthesia." [House Committee Print No. 36, Health Care for American Veterans, page 156, dated June 7,1977.]
6. St. Paul Data
The St. Paul Fire and Marine Insurance Company malpractice insurance premium rate for claims-made coverage for self-employed CRNAs decreased nationally a total of 52 percent from 1988 through 1998. The premium drop is detailed in the Appendix entitled, "Nurse Anesthetist Professional Liability Premiums." St. Paul is the country's largest provider of liability insurance for health care professionals, and insures both CRNAs and anesthesiologists.
From 1988 to 1996, St. Paul returned nearly $26,000,000 in premiums to its insured CRNAs because the loss experience was substantially better than St. Paul originally predicted.
The decline in CRNA malpractice insurance premium rates demonstrates the superb anesthesia care that CRNAs provide. The rate drop is particularly impressive considering inflation, an increasingly combative legal system, and generally higher jury awards.
In a 1988 book, Mark Wood of St. Paul Fire and Marine Insurance Company summarized a St. Paul study of its anesthesia-related claims. St. Paul studied the leading medical liability allegations that St. Paul-insured anesthesiologists and CRNAs reported between 1981 and 1985. The data consisted of all claims, including pending and closed claims. St. Paul concluded that "[n]urse anesthetist loss experience is very similar to that of anesthesiologists..." [Wood, MD, "Monitoring Equipment and Loss Reduction: An Insurer's View," in Gravenstein JS, Holzer JF (eds): Safety and Cost Contained in Anesthesia. 1988. Stoneham, Mass.: Butterworth Publishers.]
Clearly, CRNAs have enjoyed a tremendous decline in professional liability premiums over the past decade. The Appendix details premium information from St. Paul for CRNAS, both on a state-by-state basis, and nationally
Quality of Care in Anesthesia
Section Two
Anesthesiologist Distortions Concerning Quality of Care
The following section discusses the articles (by Abenstein and Warner; Silber, et al.; and Wiklund and Rosenbaum) that anesthesiologists have primarily cited to support their view that CRNAs should be anesthesiologist supervised, and that utilization of anesthesiologists improves anesthesia outcomes. As the following will demonstrate, however, none of the articles cites any credible scientific evidence that validates the anesthesiologists' position. In fact, two of the three articles do not even discuss the role of CRNAs in anesthesia care.
1. Abenstein and Warner Article in Anesthesia & Analgesia [Abenstein, JP, Warner, MA. "Anesthesia providers, patient out- comes and costs." Anesthesia & Analgesia. 1996;82:1273-1283.1
A. Abenstein and Warner Distortions Concerning Minnesota Department of Health Study
The Minnesota Department of Health (DOH) study discussed earlier led to development of the Abenstein and Warner article. In its 1994 study of the provision of anesthesia services by CRNAs and anesthesiologists, the DOH reached four "key findings,"1 including the following:
There are no studies, either national in scope or Minnesota-specific, which conclusively show a difference in patient outcomes based on type of anesthesia provider. [page 23, DOH study] [emphasis added]
The Minnesota Society of Anesthesiologists (MSA) had urged the DOH to reach different conclusions, and the department refused to do so. Disappointed that their views about quality weren't reflected in the department's report, anesthesiologists decided to seek a different forum to air their opinions. Two Minnesota anesthesiologists - doctors Abenstein and Warner - essentially repackaged the MSA's report that the MSA had submitted to the DOH, and published it as an article in June 1996 in Anesthesia and Analgesia. Abenstein and Warner acknowledge in their article that it "is an abridged version of a document submitted by the Minnesota Society of Anesthesiologists to the Minnesota Commissioner of Health." [page 1273]
The Abenstein and Warner article purported to analyze quality of care in anesthesia, quoted the Minnesota Department of Health report at length at the end of the article, but failed to mention the key conclusion about quality quoted above. It is clear that Abenstein and Warner failed to mention the conclusion because it did not fit their thesis that CRNAs should be anesthesiologist supervised.
As Christine Zambricki states in the enclosed article from the October 1996 AANA Joumal:
We are curious as to how the authors' [Abenstein and Warner] omission of three of the [Minnesota DOH'S] four concluding findings could be overlooked in Anesthesia and Analgesia's extensive peer and editorial review. This is especially surprising because the finding that directly contradicts Abenstein and Warner's principal thesis was considered crucial enough to the report to be restated in the report's executive summary. If, as the Minnesota Department of Health's report contends, there are no studies that 'conclusively show a difference in patient outcomes based on type of anesthesia provider,' it becomes difficult, if not impossible, to support the authors' thesis that an increase in the number of practicing anesthesiologists is the primary reason for the decrease in anesthesia-related mortality.
[Zambricki, CS. "'Anesthesia providers, patient outcomes, and costs': the AANA responds to the Abenstein and Warner article in the June 1996 Anesthesia and Analgesia." AANA Journal, 1996;64:413-416, at page 415.]
The Abenstein and Warner article is a partisan advocacy piece - it is not a credible scientific evaluation. Remarkably, despite his subsequent decision to publish the Abenstein and Warner article, the editor of Anesthesia and Analgesia (Dr. Ronald Miller), stated that:
There were many reasons not to publish this paper. First, as recognized by Abenstein and Warner,'[it] lacks the scientific credibility of a review or original article and is related to policy making more than science'...Abenstein and Warner often are not only subjective, but clearly biased toward one method of anesthesia care delivery... [Miller, Ronald D., "Perspective from the Editor-in-Chief: Anesthesia Providers, Patient Outcomes, and Costs." Anesthesia and Analgesia. June 1996, 82:1117-18.]
B. Abenstein and Warner Distortions Relating to Increased Number of Anesthesiologists and Anesthesia Safety
Abenstein and Warner conclude that improved patient outcomes associated with the administration of anesthetic agents have resulted almost exclusively from the growth of the number of practicing anesthesiologists. In contrast, as noted above, the Minnesota Department of Health concluded that studies to date do not show a difference in patient outcome based on whether the anesthesia provider is an anesthesiologist or CRNA, rejecting the position argued by Abenstein and Warner.
Gross variations between observed reductions in anesthesia-related mortality compiled by Abenstein and Warner and the growth in membership reported by the American Society of Anesthesiologists suggests that there is little, if any, correlation between the reduction in mortality and an increase in anesthesiologists. Increases in the numbers of practicing nurse anesthetists show the same long-term growth as anesthesiologists, and variations in the rate of growth of CRNAs seem to coincide with the variations in the decline of mortality compiled by Abenstein and Warner.
The exponential decline in anesthesia-related mortality has resulted from the almost complete elimination of administrators lacking anesthesia education; improvements in technology and anesthetic agents; a marked increase in the proportion of patients who received anesthesia care from highly educated anesthesia specialists, including anesthesiologists and CRNAs; and an increased understanding of the causes of adverse events associated with anesthesia.
In two different letters to the editor of Anesthesia & Analgesia, physicians elaborated on the flaws in Abenstein and Warner's analysis:
1 ."It is interesting that there exist no data within the last 20 years concerning patient outcome as a function of anesthesia provider. Much has changed in anesthetic practice in 20 years, not only from the standpoint of medical and technical factors, but also in terms of the distribution of providers, the types of patients and surgeries encountered by these providers, and the organizational nature of these practices.... In summary, although the data, information, and analyses provided by the authors are interesting and provocative, I strongly disagree with their nearly unqualified statement that 'the anesthesia care team and hybrid practices appear to be the safest methods of delivering anesthesia care. This safety may be due, in part, to the rapid availability of physicians, especially during medical crises.' The question of how best to organize anesthesia care (or any other type of medical care) for achieving maximum patient safety has not yet been thoroughly examined. It is inappropriate to make claims such as those made by the authors based on such a paucity of data and analysis." [David M. Gaba, MD, Department of Anesthesia, Stanford University School of Medicine, Veterans Affairs Palo Alto Health Care System, Palo Alto, California; Anesthesia & Analgesia. December 1996, 82:1347-1348, Letters to the Editor.]
2. "...I question the validity of the conclusion reached by the authors [Abenstein and Warner] regarding the anesthesia care team in which they state, 'When the data are critically examined, the evidence is very supportive that the anesthesiologist-led anesthesia care team is the safest and most cost effective method of delivering anesthesia care. At this time, public policy decisions should encourage the development of anesthesia care teams where none exist, particularly in the rural areas, and assure the continued utilization of this patient care model'....Unchallenged acceptance of the conclusion that evidence supports a specific method of anesthesia care delivery to be the 'safest and most cost effective' is misleading to patients, colleagues, and those responsible for shaping health care delivery policy... the participation of Certified Registered Nurse Anesthetists (CRNAs) in delivery of anesthesia care would have ceased many years ago if there was evidence that this participation resulted in a less favorable outcome compared with anesthesia personally administered by an anesthesiologist." [Robert K. Stoelting, MD, Department of Anesthesia, Indiana University School of Medicine, Indianapolis; Anesthesia & Analgesia. December 1996, 82:1347, Letters to the Editor.]
C. Abenstein and Warner Distortions Relating to the Bechtoldt and Forrest Studies
The report submitted to the Minnesota Department of Health by the Minnesota Society of Anesthesiologists, and the Abenstein and Warner article, rewrote the findings of the Bechtoldt and Forrest studies that we summarized previously. Abenstein and Warner claim that the studies show that there were differences in the outcomes of care based on type of provider, notwithstanding that the actual researchers came to the opposite conclusion.
The Minnesota Department of Health report, in addressing the Bechtoldt study, stated:
Observed differences [in the incidence of anesthetic-related deaths] suggest that anesthesiologists and the CRNA-anesthesiologist care team were somewhat associated with lower rates of anesthesia-related deaths than CRNA's [sic] working alone. However, given the absence of controls, the findings cannot be used to determine (1) whether the differences are greater than would be expected by chance, or (2) the extent that the type of anesthesia provider is responsible for the differences versus other factors. The author concluded that the incidence of patient death among these groups is 'rather similar.' [page 12, Minnesota DOH study]
Concerning the Forrest study, the Minnesota Department of Health stated:
Outcomes considered were deaths, complications, and intermediate outcomes. Ratios of the actual number of adverse outcomes (or deaths, morbidity, or weighted outcome scales) to the number predicted from selected patient and hospital characteristics (i.e., indirectly standardized outcomes ratios) for the two groups were compared and tested. The study concluded that, although there were some unadjusted outcome differences between the two groups, after controlling for patient and hospitals characteristics, there were no statistically significant differences in outcomes between the two groups of hospitals defined on the basis of primary type of anesthesia provider. [page 11, Minnesota DOH study]
The enclosed December 1996 AANA Journal article by Denise Martin-Sheridan and Paul Wing, as well as the Zambricki article cited earlier, details the Abenstein and Warner article's numerous distortions and errors. Martin-Sheridan and Wing conclude that:
In general, the authors [Abenstein and Warner] reconfigure statistics and findings in the literature concerning outcomes of anesthesia care based on provider. If the best available research studies did not support their position, we feel it was inappropriate and misleading to reconfigure data upon which recommendations for policy decisions were made.
[Martin-Sheridan, D, Wing, P "Anesthesia providers, patient outcomes, and costs: a critique." AANA Journal 1996; 64(6):528- 534, at page 533.]
2. Silber Study in Medical Care
[Silber, JH, Williams, SV, Krakauer, H, Schwartz, JS. "Hospital and Patient Characteristics Associated With Death After Surgery. A Study of Adverse Occurrence and Failure to Res- cue." Medical Care. 1992;30:615.]
The Silber study examined the death rate, adverse occurrence rate, and failure rate of 5,972 Medicare patients undergoing two fairly low-risk procedures -- elective cholecystectomy and transurethral prostatecto my. The study did not discuss any anesthesia provider except physician anesthesiologists; the study did not even mention CRNAs. The study, therefore, had nothing to do with CRNAs and did not compare the outcomes of care of nurse anesthetists to those of anesthesiologists. The study did not address any aspect of CRNA practice; it certainly did not explore the issue of whether CRNAs should be physician supervised.
The Silber study was a pilot study, i.e., a study to demonstrate the feasibility of performing a more definitive study concerning patients developing medical complications following surgery. It would be inappropriate to formulate public policy based on the Silber study; the study does not address CRNAs, and cannot be considered conclusive even about the issues that it does address. The Silber study states, at page 625:
This pilot project examined ideas that, to our knowledge, have not been examined previously, and more work is needed before the full significance of the results can be determined. It is especially appropriate, therefore, that the limitations of the project be recognized.
At most, the study's conclusions support the proposition that certain facilities would benefit from having a board-certified anesthesiologist in the Intensive Care Unit. This might result in the "rescue" of some patients who have undergone elective cholecystectomies and transurethral prostatectomies and developed life-threatening postoperative complications. The Silber study's conclusions have nothing to do with nurse anesthetists or the nature of who may supervise, direct, or collaborate with nurse anesthetists. At most, the study concluded that anesthesiologists may play a clinically valuable role in caring for postoperative complications. The study, however, did not involve examination of the outcomes of anesthesia in the operating room.
In his analysis of the Silber study, Dr. Michael Pine (physician and expert in quality and health care) stated that:
Thus, the presence of board-certified anesthesiologists does not appear to lower the rate of complications, either alone or in combination with other factors such as high technology. It is not anesthesia care but the failure to rescue patients once complications occur which contributes to the death rate. On the other hand, unmeasured factors such as a higher percentage of other board-certified physicians in the hospital, also may account for the better outcomes. The conclusion to be drawn from this study is that, although the presence of board-certified anesthesiologists may not make a difference in the operating room, it may make a difference in the failure to rescue patients from death or adverse occurrences after postoperative complications have arisen. This conclusion is in keeping with the expanded role that anesthesiologists have identified for themselves in post-operative care....
Dr. Pine went on to conclude, in pertinent part, regarding the Silber study that:
"1. This study encompassed the entire period of operative and postoperative care and was not specific to anesthesia staffing.
2. The rate of deaths possibly attributable to anesthesia care is a negligible fraction of the death rate found in this study.
3. The factors that significantly affect mortality and are most amenable to clinical interventions arise during postoperative management, not during the administration of anesthesia.
4. The type of anesthesia provider does not appear to be a significant factor in the occurrence of potentially lethal complications. If anything, this study suggests that surgical skill is more important.
5. The presence of board-certified specialists does appear to make an important difference in post-surgical care."
Pennsylvania anesthesiologists have unsuccessfully attempted to use the Silber study as a justification for a restrictive regulation they have urged the state's board of medicine to adopt. While the board proposed the regulation, it has not adopted it. Reportedly, the board decided at a March 1998 meeting to withdraw the proposal. The proposed regulation would have required physicians who delegate duties to CRNAs to have qualifications that only anesthesiologists typically possess. The practical effect would have been to require CRNAs to be anesthesiologist supervised in every practice setting.
Significantly, the Independent Regulatory Review Commission (IRRC), a Pennsylvania oversight commission that reviews health care proposals, carefully evaluated the Silber study, and issued a report rejecting the study as any basis for requiring anesthesiologist supervision of CRNAs. The IRRC stated that:
Based on our review of the 1992 Medical Care article, we have concluded, as its authors clearly state, it is a preliminary study and that caution should be taken in making any definitive conclusions. More importantly, the authors did not consider the scenario of an operating physician delegating the administration of anesthesia to a CRNA, or what expertise the operating physician should have in order to safely delegate anesthesia to a CRNA. Therefore, we do not believe this study should be used as justification for the significant change in practice for the ad- ministration of anesthesia.
The IRRC further stated that:
There have been two studies, both completed over 20 years ago, that compared the outcomes of anesthesia services provided by a nurse anesthetist and an anesthesiologist. Neither of these studies concluded that there was any statistically significant difference in outcomes between the two providers. This conclusion was also reached by the Minnesota Department of Health, which recently completed a study on the provision of anesthesia services. In fact, most studies on anesthesia care have shown that adverse outcomes and deaths resulting from anesthesia has decreased significantly in the last several decades as [a] result of improved drugs and monitoring technology.
3. New England Journal of Medicine Articles (by Wiklund and Rosenbaum)
[Wiklund, RA, Rosenbaum, SH. "Medical Progress: Anesthesiology" (part one). New England Journal of Medicine. 1997;337(16):1132- 1 1 41. Wiklund, RA, Rosenbaum, SH. "Medical Progress: Anesthesiology" (part two). New England Journal of Medicine. 1997;337(17): 1215-1219.1
These articles attempt to summarize key developments in the broad field of anesthesiology during the past 30 years. The articles focus on "preparation of patients for surgery, recent developments in anesthetic agents and techniques, multimodal pain management, and postoperative complications related to anesthesia."
The articles, however, do not attempt to compare patient outcomes by type of anesthesia provider. In fact, the articles do not discuss the involvement or contributions of CRNAs. The articles, therefore, have no relevance to the issue of CRNA versus anesthesiologist quality, and certainly have no bearing on the question of whether CRNAs should be physician supervised.
The articles have some merit as an overview of anesthesiology developments during the past 30 years. For example, the authors discuss advances in applied research that have led to new technology, products, and techniques. In certain areas, however, the authors leave the path of an unbiased review of the specialty to make unsubstantiated or misleading comments about the unilateral contributions of anesthesiologists to the advancements achieved.
For example, part one of the article states in its opening paragraph that anesthesia-related deaths have decreased dramatically since the late 1960s, coinciding with a decision by the National Institutes of Health to "support training in clinical anesthesiology." While it makes logical sense that proper training should enhance outcomes in all disciplines, the reader is left to assume that it was this seminal event - physician training in anesthesiology - which has led directly to the decreased mortality rates mentioned.
In fact, many factors, some of which are discussed in the articles, have influenced the trend to improved anesthesia-related outcomes. The articles make little attempt to provide statistical support regarding the causes of outcome trends and do not compare outcomes based upon type of anesthesia provider, type of case, surgical setting, or patient physical status.
The authors make the blanket statement that:
Increasingly, anesthesiologists direct the preoperative assessment and preparation of patients for surgery with the aim of ensuring safe and efficient care while controlling costs by reducing unnecessary testing and preventable cancellations on the day of surgery. [page 1132]
While the value of preoperative patient assessment is indisputable, the authors reference only one article to substantiate their claim that anesthesiologist management of this process is particularly beneficial. In that case study [Fischer, SP "Development and Effectiveness of an Anesthesia Preoperative Evaluation Clinic in a Teaching Hospital." Anesthesiology. 1996;85(l):196-206], cost-savings are reported through the use of an organized preoperative assessment clinic staffed by anesthesiologists and nurse practitioners, a service not previously available at this large, university-based medical center. Consequently, both nurses and physicians contributed to the clinic's cost effectiveness. Any inferences to be drawn from the Fischer article are limited, because the article is based on a case study of a single anesthesia preoperative evaluation clinic. Moreover, the Fischer study did not compare CRNA preoperative evaluation effectiveness with that of anesthesiologists.
The Fischer article points out the benefits of developing protocols for reasonable preoperative testing and evaluation, but breaks no new ground in this area. If anything, the findings indicate that cost effective care in the preoperative period results from multidisciplinary guideline development and acceptance, as opposed to guidelines developed and managed solely by anesthesiologists.
Wiklund and Rosenbaum fail to support their premise that anesthesiologists, as a group, are "increasingly" staffing preoperative clinics and developing their own standardized protocols for assessing patients. In fact, their analysis of the Fischer article suggests there is a trend toward protocols developed by various specialties that can be utilized by all providers caring for the patient in the preoperative period.
Examples referenced in the article include guidelines jointly developed by the American College of Cardiology and the American Heart Association regarding the preoperative cardiovascular evaluation of patients undergoing noncardiac surgery. According to the authors, these guidelines have actually replaced those previously developed and standardized by anesthesiologists.
Further misleading editorial comments appear in part two of the article. Addressing the subject of new techniques of patient monitoring, the authors state:
Prompted by the Harvard Medical School report on standards of monitoring during anesthesia, the American Society of Anesthesiologists has become a leader in the adoption of standards of care and guidelines for practice. As a result, pulse oximetry and capnography (the analysis of carbon dioxide in exhaled air) are now used routinely to monitor general anesthesia in virtually all surgical patients in the United States. [page 1217]
Once again, the authors blend legitimate technological advancement with credit to a single professional group. In fact, the Harvard monitoring standards referenced here were first adopted and promoted by the American Association of Nurse Anesthetists. While it is true that the American Society of Anesthesiologists has since endorsed the standards as well, it is absurd to claim that oximetry and capnography have become anesthesia standards of care solely "as a result" of the ASA's endorsement.
Quality of Care in Anesthesia
Summary
This publication has demonstrated that CRNAs provide superb anesthesia care, and has refuted anesthesiologist contentions to the contrary. Anesthesia-related accidents are infrequent; those that do occur tend to result from lack of vigilance rather than the level of education of the provider. The federal Centers for Disease Control has considered conducting a large-scale study on anesthesia care, but decided such a study would not be worth the high cost such a study would entail. The reason is that the evidence is overwhelming that anesthesia care is very safe, regardless of whether the care is given by a CRNA or anesthesiologist. It is clear that studies to date demonstrate that there is no statistically significant difference between the anesthesia care provided by CRNAs working alone, CRNAs working with anesthesiologists, or anesthesiologists providing care alone. In addition, malpractice insurance premiums (as shown by St. Paul Fire and Marine Insurance Company statistics) for CRNAs have decreased significantly over the past 1 0 years, further demonstrating that CRNAs provide safe anesthesia care.