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The American Society of Echocardiography (ASE), established in 1975, has long encouraged the assessment of quality in the practice of echocardiography. To that end it has published and continues to develop documents establishing guidelines for the practice of echocardiography (18). In 1995, the ASE published a series of recommendations specifically for Continuous Quality Improvement (CQI) in echocardiography (9). The accelerated growth of the clinical application of echocardiography combined with the complexity of ultrasound technology, conduct of examinations, and interpretation of results were cited as some of the reasons for developing a CQI program. In the following document, the ASE and the Society of Cardiovascular Anesthesiologists (SCA) seek to establish recommendations and guidelines for a CQI program specific to the perioperative environment. Using the prior ASE publication on CQI as the foundation, we will 1) present a rationale for CQI in the perioperative period, 2) define the components of a perioperative echocardiography service, 3) establish the principles of CQI as they relate to the practice of perioperative echocardiography and 4) assess whether CQI programs are effective in the perioperative period. The recommendations and guidelines set forth in this document are to be applied to any echocardiographic procedure performed in the intraoperative period as well as to any in the immediate pre- or postoperative period when it is performed independently of the CQI program of an established Level III echocardiographic service.
The integration of continuously evolving and complex scientific principles and technology into the health care environment can sometimes be challenging. In the last decade, the use of echocardiography in the perioperative period and in particular, intraoperative transesophageal echocardiography (TEE) has expanded rapidly. The conduct, interpretation, and clinical application of echocardiography in the perioperative environment are complex and require appropriate knowledge, technical skills, and complete familiarity with operative concerns. Moreover, diagnostic interpretation of these exams has been reported to vary widely, especially during congenital heart surgery (10). CQI programs are therefore equally necessary in the perioperative environment. CQI is recommended for physicians performing and interpreting perioperative studies in order to ensure comprehensive data acquisition and accurate interpretation. Additionally, a CQI program may be used to assess and prevent underutilization, overutilization, or misuse of perioperative echocardiography. In the last five years, the goal of improving quality in health care has gained national prominence, triggered in large part by a publication on medical errors from the Institute of Medicine (IOM) (11). This report galvanized the public and private sector and the medical profession into a collaborative effort at building a safer health care system. A centerpiece of that strategy has been the assessment and improvement of quality in health care delivery. Recently, the Centers for Medicare and Medicaid Services have initiated several programs to improve quality in health care services that can best be described as "pay for performance" (12). The first of these initiatives aims to improve quality of inpatient care to Medicare beneficiaries by providing financial incentives. Given the purported early success of this program (13), expansion of the program to all health care services including echocardiography should be anticipated. Perioperative echocardiographers who establish CQI programs and demonstrate improvements in quality measures of their practice are likely to be well-positioned for this future.
Perioperative Echocardiography Perioperative echocardiography involves the use of cardiac ultrasound in surgical patients immediately before, during, or after their operation, and includes transesophageal, epicardial, epiaortic, and transthoracic approaches. Practice locations may include the operating room, recovery room, intensive care unit, and the echocardiography laboratory. The various modalities that comprise perioperative echocardiography include M-mode and two- and three-dimensional imaging and pulsed wave, continuous wave, color flow, and tissue Doppler. The echocardiographic data are obtained in real-time and interpreted by a physician in a timely manner to direct the clinical management of surgical patients. These techniques may be combined with a variety of adjuncts such as contrast agents, and may be utilized during a variety of physiologic conditions including pharmacologic stress.
Continuous Quality Improvement
Equipment and Recording An ultrasound machine with full diagnostic capabilities is required to provide a comprehensive perioperative echocardiographic examination. At a minimum, the system should be equipped with the capacity for two-dimensional Doppler (pulsed wave, continuous wave, and color flow), and M-mode imaging. Each console should have a video screen that can be made visible either directly or via another monitor screen to the surgeon and other clinicians responsible for the patient's medical care. All ultrasound systems must also possess a system for permanently recording data onto a media format that allows for offline review or analysis. Recently, the ASE has made an unequivocal recommendation for an all-digital capture, storage and review process (7). All perioperative echocardiographers are therefore urged to move toward this digital standard by incorporating the Digital Imaging and Communications in Medicine (DICOM) format, high-speed networking, and permanent storage with built-in redundancy (7). TEE probes used in the perioperative period should be capable of multiplane imaging.
Request for Echocardiographic Services
Patient Interactions
Role of the Physician and the Sonographer
Performance and Interpretation Time Echocardiographic data that will influence the surgical plan should be interpreted and reported to the surgeon in an ongoing and timely manner. A verbal report must be provided throughout and in particular, at the completion of the initial exam to both the surgical and anesthesia care teams. A written or electronic description of the findings should be left in an obvious location within the operating room upon completion, so that it is available for immediate reference. Furthermore, a written or electronic report (preliminary or final) outlining key findings should be included in the medical record by the end of the procedure. Official reports of all the intraoperative data may be generated after completion of the surgical procedure, and should be consistent with the real-time interpretation provided to the surgeon. Such a report should be legible, placed in the patient's medical record within 24 hours of surgery and include: 1) a description of the echocardiographic procedure, 2) indications for the procedure, and 3) important findings.
Comprehensive versus Limited Perioperative Examination Although a comprehensive examination is always recommended, a limited or focused study may be occasionally indicated. Typically, these patients have had a recent comprehensive examination with no expected interval change other than in the area being reexamined. A limited intraoperative TEE examination may also be warranted following a request to determine the etiology of acute hemodynamic compromise such as during an intraoperative cardiac arrest.
Specialized Echocardiographic Procedures
Acquisition of Primary Training and Technical Skills Minimal competence required for performing and interpreting perioperative echocardiography in adult patients requires basic cognitive and technical knowledge of ultrasound physics, instrumentation and transducer manipulation for image and data acquisition, as well as a fundamental understanding of cardiac and great vessel anatomy, physiology, and pathology. In addition, an appreciation of the interaction between surgical techniques and the pathophysiology of the disease process under study is essential. A comprehensive perioperative echocardiographic examination is performed predominantly through the TEE approach, although epicardial and epivascular techniques continue to have a role during surgery, particularly for the echocardiographic assessment of the ascending aorta, or rarely when TEE probe insertion can not be accomplished or is contraindicated (17). Training guidelines for less frequently used procedures in the perioperative period such as transthoracic echocardiography (22), stress echocardiography (23), echocardiography for pediatric patients (1), and echocardiography using hand-carried ultrasound devices (22) have been previously detailed. Since TEE is the dominant perioperative procedure, the remainder of this document will focus on the use of TEE. TEE evaluation of the patient with congenital heart disease is more complex and practitioners in this arena require special expertise. We therefore endorse the recommendations published by the Pediatric Council of the ASE (1). Training requirements represent the minimal training experience that is considered necessary to achieve the skills for performing perioperative echocardiography. The essential components of training include independent work, directly supervised activities, and assessment programs (22,24). Through a structured independent reading and study program, trainees must acquire an understanding of the principles of ultrasound and indications for perioperative echocardiography. This independent work should be supplemented by regularly scheduled didactics such as lectures and seminars designed to reinforce the most important aspects of perioperative echocardiography (19,22,24). Specific guidelines on training in perioperative echocardiography have been published by an ASE/SCA Task Force (19). These recommendations, which were initially developed mainly for anesthesiologists and cardiologists, recognized that perioperative echocardiography can be practiced at different levels. Both basic and advanced levels of perioperative echocardiographic training refer to specialized training that typically extends beyond the minimum exposure to echocardiography that occurs during normal residency training. The knowledge and skills necessary to practice perioperative echocardiography at the basic and advanced levels are summarized in Tables 13 (19,22,25).
Trainees undergoing basic training should learn indications and contraindications and how to place the TEE probe, operate the ultrasound machine, and perform a TEE examination, all under direct supervision by another physician who has already acquired advanced training. Trainees should be encouraged to master the comprehensive examination defined by the ASE and SCA (6). A basic practitioner should be able to acquire all 20 of the recommended cross-sections. Thus, basic training does not prepare the practitioner to influence the surgical plan without the assistance of a physician with advanced training in perioperative echocardiography (19). For basic training, 150 complete examinations should be studied under appropriate supervision. These examinations must include the full spectrum of commonly encountered perioperative diagnoses, and at least 50 comprehensive perioperative TEE examinations personally performed, interpreted, and reported by each trainee (Table 4) (19,22,25).
Advanced training should take place after basic training in a program designed specifically to accomplish comprehensive training in perioperative echocardiography (19,22,25). Physicians with advanced training are able to utilize the full diagnostic potential of PTEE. In this regard, cardiovascular lesions are diagnosed, and the information is used to influence the patient's perioperative management including assisting the surgeon in planning the surgical procedure. For advanced practice, the comprehensiveness of training is paramount (22,24). The ASE/SCA Task Force recommends that 300 complete examinations be studied under direct supervision of another physician who has already acquired advanced training (19). These examinations must include a wide spectrum of cardiac diagnoses and at least 150 comprehensive perioperative TEE examinations that are personally performed, interpreted, and reported by the trainee (Table 4). Physicians should also take the Examination of Special Competence in Perioperative TEE (PTEeXAM) and aspire to achieve Board Certification in Perioperative Echocardiography through the National Board of Echocardiography (NBE) (www.echoboards.org). The director of the training program must be a physician with advanced training and proven expertise in perioperative echocardiography, who has performed at least 450 complete examinations, including 300 perioperative TEE examinations or has equivalent experience (Table 4) (19). As advanced trainees acquire more experience, they may be allowed to work with more independence, but the immediate availability and direct involvement of an advanced supervisor during the examination is an essential component of advanced training. Training requirements represent the minimal training experience that is considered necessary to achieve the skills for performance at a particular level. Such training is expected to occur under the direct supervision of a practitioner who has already acquired advanced training, and for the most part, occurs during formal fellowship training in either cardiovascular medicine, cardiovascular anesthesiology, cardiovascular surgery, or critical care medicine (22,24). However, physicians trained prior to the development of these techniques may have properly learned their use while in practice, and can achieve appropriate training in perioperative echocardiography without enrolling in a formal training program (22,24). Nonetheless, the same prerequisite medical knowledge, medical training, and goals for cognitive and technical skills apply to them as they apply to physicians in formal training programs. They should work with other physicians who have advanced TEE training or equivalent experience to achieve the same training goals and case numbers as the training levels previously delineated. Physicians seeking basic training via this pathway should also have at least 20 hours of Continuing Medical Education (CME) devoted to echocardiography. Physicians seeking advanced training via this pathway should have at least 50 hours of CME devoted to echocardiography. The CME in echocardiography should be obtained during the time that trainees are acquiring the requisite clinical experience in TEE. The supporting surgical program must have the volume and diversity to ensure that trainees will experience the wide spectrum of diagnostic challenges encountered in perioperative echocardiography and learn to use TEE effectively in all its established perioperative applications. The perioperative echocardiography training program should ideally have an affiliation with an echocardiography laboratory so that trainees can gain regular and frequent exposure to teaching and clinical resources within that laboratory. Both basic and advanced trainees must be taught how to convey and document the results of their examination effectively. Formal and informal evaluations of the progress of each trainee should be conducted during training at a minimum of twice a year. All trainees should document their experience in detail in a log of the examinations they performed, and should be able to demonstrate training equivalent in depth, diversity, and case numbers to the training levels previously delineated. The experience and case numbers acquired during basic training may be counted toward advanced training if the basic training was completed in an advanced training environment. Proof of competence consists of a set of requirements that provide some assurance that physicians have gained the expertise needed to perform according to recognized standards. Documentation of competence can be achieved by means of letters or certificates from the director of the perioperative echocardiography training program (Table 5). This documentation should state the dates of training, and that trainees have successfully achieved or surpassed each of the training elements. All echocardiographic facilities should have on file appropriate documents attesting to the adequacy of physician training. The file should be kept up to date with the addition of a new record for additional physicians as they arrive. Records of individuals leaving a facility should be kept for at least 10 years (9).
Maintenance of Technical Skills
Periodic Review In addition to minimal caseloads, CQI requires intermittent review of study performance and interpretation. This review should include all types of procedures performed by members of the perioperative echocardiography team, including but not limited to transesophageal, transthoracic, epiaortic and epicardial examinations. Ideally, this review is conducted by an immediate repetition of the study by a second echocardiographer. However, since intraoperative echocardiography is relatively invasive, the performance review by a second physician skilled in echocardiography may be conducted by a review of stored images. Components of this review include an assessment of 1) the documentation of the indications for the procedure and patient consent, 2) appropriate use of ultrasound system technology and controls, 3) the adequacy and presentation of the imaging planes, and 4) concurrence between the recorded images and the written report (i.e. do the recorded images document the echocardiographic findings provided in the written report). It is recommended that a minimum of 5 cases for each echocardiographer in a service be subjected to such review every 12 months. In a similar fashion, an interpretation review should be conducted every year on 5 of the cases for each physician in the service. Here the focus is not on the performance variables but rather on whether the examination has been accurately interpreted. The two interpretations should be compared and any differences discussed with the primary physician. Changes to the echocardiographic report that occur as a result of an interpretation review should be made only after consultation with and the agreement of the physician responsible for the initial report. Documentation of the occurrence of performance and interpretation reviews and the feedback provided to those subjected to review is to be maintained as part of the CQI process. A final component of the periodic review process is that of equipment review. All electrical systems should be checked for current leakage according to industry standards. TEE probes should be checked for leakage at a minimum of every 3 months. Regular preventive maintenance service should be conducted according to manufacturer's recommendations. In the intraoperative environment, it is critical that echocardiographic equipment such as the TEE probes be cleaned according to institutional guidelines. In addition, the ultrasound system and electrocardiographic cables should be wiped carefully with an antiseptic solution after each patient use. A review of the adequacy and safety of the cleaning process with appropriate documentation should be conducted every 6 months.
Continuing Education
Documentation of CQI Process
Utilization Review
Few perioperative services have reported on their experience with a CQI program but the limited literature indicates that incorporating CQI into daily practice can be beneficial. In 2002, a report from an intraoperative service examined the interpretive skills of a group of 10 cardiac anesthesiologists practicing in an academic environment (29). These investigators determined that the intraoperative interpretation of a comprehensive TEE examination compared favorably with the off-line interpretation provided by two physicians whose primary practice was echocardiography. Through the CQI process, they were also able to identify areas where additional training was required. Similarly, the provision of educational aids and performance feedback to anesthesiologists increased their ability to record a basic intraoperative TEE examination (30). These authors concluded that their attempt to assess compliance with published guidelines for basic intraoperative TEE produced marked improvement in practice.
Aside from being a mandate of various accreditation agencies, CQI is a process that will aid perioperative echocardiographers in improving the delivery of care to patients. While no set of guidelines will guarantee an improvement, the guidelines and recommendations presented in this document and summarized in Table 6, should serve as a foundation upon which each perioperative service can build a future defined by the consistent delivery of a high quality product. CQI in the perioperative environment is feasible but must move from the periphery to the core of the echocardiography service.
Members of the Council for Intraoperative Echocardiography Chair: Joseph P. Mathew, MD, FASE Vice-Chair: Stanton K. Shernan, MD, FASE Mark Adams, RDCS, FASE Solomon Aronson, MD, FASE Anthony Furnary, MD Kathryn Glas, MD, FASE Gregg Hartman, MD Lori Heller, MD Linda Shore-Lesserson, MD Scott T. Reeves, MD, FASE David Rubenson, MD, FASE Madhav Swaminathan, MD, FASE
Published simultaneously in the Journal of the American Society of Echocardiography.
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