Intravenous Nesiritide, a Natriuretic Peptide, in the Treatment of Decompensated Congestive Heart Failure
Wilson S. Colucci, M.D., Uri Elkayam, M.D., Darlene P. Horton, M.D., William T. Abraham, M.D., Robert C. Bourge, M.D., Allen D. Johnson, M.D., Lynne E. Wagoner, M.D., Michael M. Givertz, M.D., Chang-seng Liang, M.D., Ph.D., Matthew Neibaur, M.D., W. Herbert Haught, M.D., Thierry H. LeJemtel, M.D., for The Nesiritide Study Group
Background Intravenous infusion of nesiritide, a brain (B-type)natriuretic peptide, has beneficial hemodynamic effects in patientswith decompensated congestive heart failure. We investigatedthe clinical use of nesiritide in such patients.
Methods Patients hospitalized because of symptomatic congestiveheart failure were enrolled in either an efficacy trial or acomparative trial. In the efficacy trial, which required theplacement of a SwanGanz catheter, 127 patients with apulmonary-capillary wedge pressure of 18 mm Hg or higher anda cardiac index of 2.7 liters per minute per square meter ofbody-surface area or less were randomly assigned to double-blindtreatment with placebo or nesiritide (infused at a rate of 0.015or 0.030 µg per kilogram of body weight per minute) forsix hours. In the comparative trial, which did not require hemodynamicmonitoring, 305 patients were randomly assigned to open-labeltherapy with standard agents or nesiritide for up to seven days.
Results In the efficacy trial, at six hours, nesiritide infusionat rates of 0.015 and 0.030 µg per kilogram per minutedecreased pulmonary-capillary wedge pressure by 6.0 and 9.6mm Hg, respectively (as compared with an increase of 2.0 mmHg with placebo, P<0.001), resulted in improvements in globalclinical status in 60 percent and 67 percent of the patients(as compared with 14 percent of those receiving placebo, P<0.001),reduced dyspnea in 57 percent and 53 percent of the patients(as compared with 12 percent of those receiving placebo, P<0.001),and reduced fatigue in 32 percent and 38 percent of the patients(as compared with 5 percent of those receiving placebo, P<0.001).In the comparative trial, the improvements in global clinicalstatus, dyspnea, and fatigue were sustained with nesiritidetherapy for up to seven days and were similar to those observedwith standard intravenous therapy for heart failure. The mostcommon side effect was dose-related hypotension, which was usuallyasymptomatic.
Conclusions In patients hospitalized with decompensated congestiveheart failure, nesiritide improves hemodynamic function andclinical status. Intravenous nesiritide is useful for the short-termtreatment of decompensated congestive heart failure.
Symptomatic decompensation is the most common reason for thehospitalization of patients with congestive heart failure dueto left ventricular systolic dysfunction. In such patients,the predominant symptoms dyspnea and fatigue are associated with pulmonary venous congestion and low cardiacoutput.1 Accordingly, the primary goal of therapy, which isthe rapid relief of symptoms, is usually approached with theuse of intravenous diuretics, vasodilators, and positive inotropicagents to decrease cardiac filling pressures and increase cardiacoutput.2 Although it has generally been assumed that improvedhemodynamic function will result in the resolution of symptomsin patients with decompensated congestive heart failure, moststudies of new drugs for this purpose have focused on hemodynamic,rather than symptomatic, end points.
Brain (B-type) natriuretic peptide is synthesized in the ventricularmyocardium, where its levels increase in patients with congestiveheart failure.3 Systemic infusion of nesiritide, a recombinanthuman brain natriuretic peptide, in patients with congestiveheart failure results in beneficial hemodynamic actions, includingarterial and venous dilatation, enhanced sodium excretion, andsuppression of the reninangiotensinaldosteroneand sympathetic nervous systems.4,5,6,7 To determine the clinicalvalue of nesiritide, we undertook two randomized trials involvinga total of 432 patients who were hospitalized because of decompensatedcongestive heart failure. In one trial (an efficacy trial),we used a double-blind, placebo-controlled design to determinethe short-term efficacy of nesiritide with regard to hemodynamicmeasures and symptoms. In the other trial (a comparative trial),we compared nesiritide with standard intravenous agents, whichserved as active controls, in terms of clinical efficacy andadverse events.
Methods
Study Population
Between October 1996 and July 1997, 432 patients who requiredhospitalization and intravenous therapy for decompensated congestiveheart failure were recruited at a total of 66 medical centersin the United States (23 centers participated in the efficacytrial and 46 centers in the comparative trial; 3 centers participatedin both trials). In both trials, the administration of dobutamine,dopamine, and intravenous vasodilators was discontinued at least30 minutes before the beginning of the study, and the administrationof milrinone was discontinued at least 2 hours before the beginningof the study. Patients were excluded from the comparative trialif they had already received an intravenous vasoactive agentfor more than four hours. In both trials, entry criteria requiredpatients to have symptomatic congestive heart failure that,in the opinion of the attending physician, warranted admissionto the hospital for therapy with one or more intravenous drugsin addition to diuretics. In the efficacy trial, patients werealso required to have a SwanGanz pulmonary-artery catheterin place and to meet hemodynamic criteria consisting of a pulmonary-capillarywedge pressure of 18 mm Hg or higher, a cardiac index of 2.7liters per minute per square meter of body-surface area or less,and a systolic blood pressure of 90 mm Hg or higher. The leftventricular ejection fraction was determined by echocardiographyor contrast ventriculography. In the comparative trial, a SwanGanzcatheter was not required but could be used at the discretionof the attending physician. Patients with recent myocardialinfarction or unstable angina (within the preceding 48 hours),clinically important valvular stenosis, hypertrophic or restrictivecardiomyopathy, constrictive pericarditis, primary pulmonaryhypertension, or active myocarditis were excluded from bothtrials.
Study End Points
In the efficacy trial, the prespecified primary end point wasthe change from base line in the pulmonary-capillary wedge pressuresix hours after the start of therapy. Secondary end points werethe global clinical status, clinical symptoms, and other hemodynamicmeasurements. In the comparative trial, the prespecified endpoints were the global clinical status and clinical symptoms.
Randomization and Study-Drug Administration
In each trial, patients were randomly assigned to a treatmentgroup in blocks of 12 by a randomization center that was independentof both the sponsor and the investigators. Nesiritide (Natrecor,Scios, Sunnyvale, Calif.), supplied as 5 mg of lyophilized powderin a 10-ml glass vial, was reconstituted and further dilutedwith a solution of 5 percent dextrose in water to the appropriateconcentration for each dose group.
In the efficacy trial, the patients were randomly assigned tothe three treatment groups in a 1:1:1 ratio. The treatmentswere as follows: placebo consisting of 5 percent dextrose inwater, first given as an intravenous bolus and then as an infusion;nesiritide given as a 0.3-µg intravenous bolus followedby an infusion of 0.015 µg per kilogram of body weightper minute; or nesiritide given as a 0.6-µg intravenousbolus followed by an infusion of 0.030 µg per kilogramper minute. The study drugs (nesiritide and placebo) were preparedin identical infusion bags and were infused in a double-blindmanner. Each subject received a continuous intravenous infusionof study drug for at least six hours. After the assessmentsat six hours, the treatment-group assignment was revealed tothe investigator by the randomization center. If symptomatichypotension occurred or the systolic blood pressure decreasedto less than 85 mm Hg, the infusion was stopped and then restartedat half the initial infusion rate once the systolic blood pressurehad stabilized at more than 90 mm Hg. The infusion rate couldnot be increased over the initial rate or after a dose reduction.Intravenous agents other than the study drug were withheld duringthe six-hour double-blind period. Oral vasoactive medicationsand intravenous diuretics were withheld for four hours beforethe measurement of base-line hemodynamic variables, and theiradministration was not resumed until after the six-hour double-blindperiod.
In the comparative trial, the patients were randomly assignedto the three treatment groups in a 1:1:1 ratio. The treatmentswere as follows: "standard therapy," consisting of a singleintravenous vasoactive agent routinely used for the short-termmanagement of decompensated congestive heart failure (e.g.,dobutamine, milrinone, nitroglycerin, or sodium nitroprusside),according to the judgment of the attending physician; nesiritidegiven as a 0.3-µg intravenous bolus followed by an infusionof 0.015 µg per kilogram per minute; or nesiritide givenas a 0.6-µg intravenous bolus followed by an infusionof 0.030 µg per kilogram per minute. Treatment was givenon an open-label basis for standard care but was given in adouble-blind manner with respect to the dose of nesiritide.At the discretion of the investigator, the doses of all medicationscould be increased and a second intravenous vasoactive agentcould be added to or substituted for the initial drug. Intravenousdiuretics and oral medications could be added at any time. Nesiritidecould be discontinued if the patient had symptomatic hypotensionor a drop in systolic blood pressure to less than 85 mm Hg,with the option to reinstitute the drug at half the previousinfusion rate. Patients randomly assigned to nesiritide couldcontinue to receive nesiritide for up to seven days at the discretionof the investigator.
Assessment of Symptoms
In each trial, global clinical status and specific symptomsof congestive heart failure (dyspnea and fatigue) were assessedat base line and six hours after the treatment with the studydrug began. In the efficacy trial, the treatment assignmentwas revealed after the assessment at six hours. In the comparativetrial, the global clinical status and symptoms were also evaluatedat 24 hours and at the end of therapy (lasting up to 7 days).Global clinical status was rated independently by both the patientand the investigator on a five-category scale (markedly better,better, no change, worse, or markedly worse) that has been usedpreviously in trials of long-term therapy for congestive heartfailure.8 Dyspnea and fatigue each were rated jointly by thepatient and the investigator on a three-category scale (improved,no change, or worse).
Hemodynamic Assessment in the Efficacy Trial
At base line, repeated measurements of the pulmonary-capillarywedge pressure and of the cardiac index that agreed to within15 percent were required before administration of the studydrug. Pulmonary-capillary wedge pressure, cardiac index, meanright atrial pressure, pulmonary arterial pressures, systolicblood pressure, and heart rate were recorded 1 1/2, 3, 4 1 /2,and 6 hours after the start of study-drug administration. Inthe efficacy trial, plasma levels of aldosterone (measured byradioimmunoassay) and norepinephrine (measured by radioenzymaticassay) were assessed at base line and at six hours.
Statistical Analysis
Data are presented as means ±SD. In the efficacy trial,the effect of the treatment assignment on hemodynamic variableswas analyzed by one-way analysis of variance. In both trials,overall comparisons among the treatment groups were performedwith the omnibus F test. Pairwise comparisons were made betweeneach dosage of nesiritide and placebo (in the efficacy trial)or standard therapy (in the comparative trial). Outcomes withrespect to global clinical status, symptoms of congestive heartfailure, and levels of neurohormones were analyzed by nonparametricmethods. All reported P values are two-sided, and P values ofless than 0.05 were considered to indicate statistical significance.
Results
Base-Line Characteristics
Base-line demographic and clinical characteristics were similaramong the patients in the two trials and were similar amongthe treatment groups within each trial, with the exception ofsystolic blood pressure, which was lower in the group assignedto nesiritide at 0.015 µg per kilogram per minute thanin the group assigned to nesiritide at 0.030 µg per kilogramper minute or the placebo group (P<0.05) (Table 1). Amongthe 127 patients enrolled in the efficacy trial, there was markedhemodynamic dysfunction, reflected by a mean pulmonary-capillarywedge pressure of 28 mm Hg, a mean cardiac index of 1.9 litersper minute per square meter, and a mean left ventricular ejectionfraction of 0.22. Likewise, plasma levels of norepinephrineand brain natriuretic peptide were markedly elevated among thepatients in the efficacy trial.
Table 1. Characteristics of the Patients at Base Line.
Efficacy Trial
Five patients discontinued treatment with the study drug beforecompleting the six-hour study period. The reasons for prematuretermination were sustained ventricular tachycardia in one patientin the placebo group, worsening congestive heart failure inone patient in the group assigned to nesiritide at 0.015 µgper kilogram per minute, and symptomatic hypotension and nausea,an excessive decrease in pulmonary-capillary wedge pressure,and oliguria in one patient each in the group assigned to nesiritideat 0.030 µg per kilogram per minute. Nesiritide causeddose-dependent decreases in pulmonary-capillary wedge pressure,right atrial pressure, systemic vascular resistance, and systolicblood pressure; a moderate increase in cardiac index; and nosubstantial change in heart rate (Table 2).
Table 2. Changes in Base-Line Hemodynamic Values at Six Hours in the Efficacy Trial.
Global clinical status as judged by the patient was better ormarkedly better than at base line in 60 percent and 67 percentof the patients in the groups assigned to nesiritide at 0.015and 0.030 µg per kilogram per minute, respectively, ascompared with 14 percent of the patients assigned to placebo(P<0.001 for both comparisons) (Figure 1). There was no changein global status in 25 percent, 23 percent, and 74 percent ofpatients in the groups assigned to nesiritide at 0.015 and 0.030µg per kilogram per minute and in the placebo group, respectively.Likewise, in the physician's judgment, global status was betteror markedly better in 55 percent and 77 percent of patientsin the groups assigned to nesiritide at 0.015 and 0.030 µgper kilogram per minute, respectively, but in only 5 percentof patients in the placebo group (P<0.001 for both comparisons).
Figure 1. Effects of Nesiritide and Placebo or Standard Therapy on Global Clinical Status as Judged by the Patient.
Open bars represent patients who received placebo (in the efficacy trial), hatched bars patients who received standard therapy (in the comparative trial), and shaded bars and solid bars patients who received nesiritide at 0.015 and 0.030 µg per kilogram per minute, respectively. Bars above the horizontal line at zero indicate the percentage of patients who had improvement or marked improvement, and bars below the line indicate the percentage of patients who had worsening or marked worsening; patients with no change are not shown. The asterisks indicate P<0.001 for the comparison with placebo.
At base line, 93 percent of patients reported dyspnea and 96percent reported fatigue. Dyspnea was rated as improved in 56percent and 50 percent of the patients receiving nesiritideat 0.015 and 0.030 µg per kilogram per minute, respectively,but in only 12 percent of those receiving placebo (P<0.001for both comparisons) (Figure 2). Similarly, fatigue was ratedas improved by 32 percent and 38 percent of patients receivingnesiritide at 0.015 and 0.030 µg per kilogram per minute,respectively, but in only 5 percent of those receiving placebo(P<0.001 for both comparisons) (Figure 2).
Figure 2. Effect of Nesiritide and Placebo or Standard Therapy on Dyspnea and Fatigue.
Open bars represent patients who received placebo (in the efficacy trial), hatched bars patients who received standard therapy (in the comparative trial), and shaded bars and solid bars patients who received nesiritide at 0.015 and 0.030 µg per kilogram per minute, respectively. Bars above the horizontal line at zero indicate the percentage of patients who had improvement, and bars below the line indicate the percentage of patients who had worsening; patients with no change are not shown. The asterisks indicate P<0.001 for the comparison with placebo.
Plasma aldosterone levels decreased by 2.5 ng per deciliter(69.4 pmol per liter) and 1.6 ng per deciliter (44.4 pmol perliter), respectively, in the groups assigned to nesiritide at0.015 and 0.030 µg per kilogram per minute but increasedby 0.6 ng per deciliter (16.6 pmol per liter) in the placebogroup (P= 0.03). Plasma norepinephrine levels did not changesignificantly in any group (a decrease of 75 pg per milliliterin the group assigned to nesiritide at 0.015 µg per kilogramper minute, an increase of 8 pg per milliliter in the groupassigned to nesiritide at 0.030 µg per kilogram per minute,and an increase of 36 pg per milliliter in the placebo group).The mean urine output over six hours (380 ml in the placebogroup) was 560 ml and 659 ml in the groups assigned to nesiritideat 0.015 and 0.030 µg per kilogram per minute, respectively(P=0.004).
Comparative Trial
The duration of therapy was similar among the three treatmentgroups, with 68 to 73 percent of the patients in each grouptreated for one or two days, 14 to 21 percent treated for threeto five days, and 9 to 14 percent treated for more than fivedays (P= 0.42). Among the 102 patients assigned to standardtherapy, dobutamine was the most common choice of medication(in 57 percent of patients), followed by milrinone (19 percent),nitroglycerin (18 percent), dopamine (6 percent), and amrinone(1 percent). A SwanGanz catheter was used in 19 percentof the patients receiving standard therapy and 18 percent ofthe patients receiving either dose of nesiritide.
In all three groups, the patients' global clinical status wasimproved at 6 hours, at 24 hours, and at the end of therapy(Figure 1). Likewise, dyspnea and fatigue improved in the threegroups at all three time points (Figure 2). There were no significantdifferences in global status, dyspnea, or fatigue among thethree groups at any time. Although the patients in the threegroups lost similar amounts of weight during the first two daysof treatment (between 0.7 and 1.1 kg), intravenous diureticswere given to fewer patients in the groups assigned to nesiritideat 0.015 and 0.030 µg per kilogram per minute (84 percentand 74 percent of patients, respectively) than in the standard-therapygroup (96 percent, P<0.001 for both comparisons).
Adverse Events
In both trials, the most common adverse event in the patientstreated with nesiritide was dose-related hypotension, whichwas usually asymptomatic or mild (Table 3). During the six-hourstudy period in the efficacy trial, symptomatic hypotensionoccurred in 2 percent and 5 percent of the patients assignedto nesiritide at 0.015 and 0.030 µg per kilogram per minute,respectively, but in none of the patients in the placebo group.Over the longer time course of the comparative trial, symptomatichypotension occurred in 4 percent of the standard-therapy group,as compared with 11 percent and 17 percent of the nesiritidegroups. Symptomatic hypotension led to discontinuation of nesiritidein 1 patient (receiving 0.030 µg per kilogram per minute)in the efficacy trial and in 15 patients (5 receiving 0.015µg per kilogram per minute and 10 receiving 0.030 µgper kilogram per minute) in the comparative trial.
In the comparative trial, bradycardia tended to be more commonin the two nesiritide groups (Table 3). The rates of other adverseevents were similar among the treatment groups in both trials.The rate of death from all causes through day 21 was 6 percentoverall and was similar in the three treatment groups; noneof the deaths were attributed to the study drug by the investigators.Concomitant use of angiotensin-convertingenzyme inhibitors,digoxin, or beta-blockers did not appear to alter the incidenceor distribution of adverse effects observed in patients assignedto nesiritide.
Discussion
The infusion of nesiritide in patients admitted to the hospitalfor treatment of decompensated congestive heart failure resultedin improvements in hemodynamic function and rapid and sustainedimprovements in clinical status. Two aspects of this study representa departure from the usual way that vasoactive agents for congestiveheart failure are evaluated. First, the effect of therapy onthe chief symptoms of decompensated congestive heart failurewas measured prospectively. Second, the study population comprisedpatients admitted specifically for management of decompensatedcongestive heart failure.
The evaluation of drugs for the management of decompensatedcongestive heart failure has generally focused on measures ofhemodynamic function in patients with a relatively stable clinicalcourse. This approach is based on the reasonable assumptionthat hemodynamic improvements in such patients will translateinto relief of symptoms. However, there are at least theoreticalreasons why such an assumption might not apply, and it has beensuggested that the evaluation of new drugs for decompensatedcongestive heart failure should measure their effects on symptomsdirectly.8 Our study demonstrates that nesiritide relieves thesymptoms of decompensated congestive heart failure. When comparedwith standard therapy consisting primarily of dobutamine ormilrinone, nesiritide was found to result in similar improvementsin global clinical status and in the symptoms of decompensatedcongestive heart failure. We cannot exclude the possibilityof bias on the part of the physicians or patients as a resultof knowledge of the changes in hemodynamic function (in theefficacy trial) or the open-label design (in the comparativetrial).
The study population was specifically selected to representpatients in whom rapid symptomatic and hemodynamic effects aredesired. All the patients had been admitted to a hospital fortreatment of decompensated congestive heart failure. All haddyspnea or fatigue, and most had both symptoms. Measurementof hemodynamic variables at base line confirmed that severehemodynamic compromise was present. In addition, plasma levelsof norepinephrine and brain natriuretic peptide, which are indicatorsof the severity of disease, were markedly elevated.
Nesiritide caused a dose-related decrease in pulmonary-capillarywedge pressure. This effect was associated with a decrease insystemic vascular resistance and an increase in the cardiacindex. Since nesiritide exerts no direct, positive inotropicaction on the myocardium, the increase in cardiac output presumablyreflects a reduction in left ventricular afterload. At six hours,the decrease in systemic vascular resistance was associatedwith mean decreases in systolic blood pressure of 4 and 9 mmHg in the patients receiving nesiritide at infusion rates of0.015 and 0.030 µg per kilogram per minute, respectively.The decrease in blood pressure was not associated with reflextachycardia or an increase in plasma norepinephrine levels ineither of these groups.
In the efficacy trial, diuretic therapy was discontinued fourhours before the study and not resumed until after measurementsat six hours had been made. It is therefore noteworthy thaturine output increased in a dose-dependent manner with the infusionof nesiritide. Likewise, in the comparative trial, in whichintravenous diuretics could be used as needed, nesiritide wasassociated with decreased use of intravenous diuretics. Theseobservations are consistent with the direct renal effects ofnatriuretic peptides.4,5,6 In addition, the decrease in aldosteronelevels in the nesiritide groups may have contributed to sodiumexcretion. These observations suggest that nesiritide may behelpful in the clinical management of fluid overload in patientswith congestive heart failure.
The most common adverse effect of nesiritide was dose-dependenthypotension, which was usually asymptomatic or associated withonly mild symptoms. By design, half the patients assigned tonesiritide initially received the drug at a dose of 0.030 µgper kilogram per minute. In clinical practice, nesiritide wouldbe started at a dose of 0.015 µg per kilogram per minuteor less, and increases in the dose would be guided by the bloodpressure. Therefore, the incidence of hypotension in this studyis probably greater than it would be in clinical practice.
Standard therapy for decompensated congestive heart failurerelies on the use of intravenous diuretics, dobutamine, milrinone,nitroglycerin, and sodium nitroprusside.2 The use of dobutamineand milrinone can be limited by the dose-dependent effects ofthese drugs on heart rate and arrhythmias.9,10 Patients takingnitroglycerin are susceptible to the development of toleranceto the drug.11 Although sodium nitroprusside is a potent vasodilator,its use is often limited by the need for close monitoring andby concern about the toxic effects of cyanide or thiocyanide,which are metabolites of sodium nitroprusside. The salutaryclinical and hemodynamic profile of nesiritide and the relativeabsence of adverse effects associated with it circumvent severalof these limitations. We therefore suggest that nesiritide wouldbe a valuable addition to the initial treatment of patientsadmitted to the hospital for decompensated congestive heartfailure.
* Other members of the Nesiritide Study Group are listed in theAppendix.
Source Information
From Boston University Medical Center, Boston (W.S.C., M.M.G); the University of Southern California School of Medicine, Los Angeles (U.E.); the Clinical Research Department, Scios, Sunnyvale, Calif. (D.P.H.); University of Cincinnati Medical Center, Cincinnati (W.T.A., L.E.W.); the University of Alabama at Birmingham, Birmingham (R.C.B.); Scripps Clinic and Research Foundation, La Jolla, Calif. (A.D.J.); University of Rochester Medical Center, Rochester, N.Y. (C.L.); Jacksonville Heart Center, Jacksonville, Fla. (M.N.); Jacksonville Center for Research, Jacksonville, Fla. (W.H.H.); and Albert Einstein College of Medicine, Bronx, N.Y. (T.H.L.).
Address reprint requests to Dr. Colucci at the Section of Cardiovascular Medicine, Boston University Medical Center, 88 E. Newton St., Boston, MA 02118.
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Appendix
The other members of the Nesiritide Study Group were as follows:Efficacy trial R. Bies, D. Ferguson, and L. Woodworth(University of Colorado Health Sciences Center, Denver VeteransAffairs Medical Center, and Denver Health Medical Center, Denver);R. Bijou (Montefiore Medical Center, Bronx, N.Y.); R. Benza,M. Smith, and A. Trimble (University of Alabama at Birmingham,Birmingham); K. Chatterjee, T. DeMarco, and D. Lau (Universityof California, San Francisco, San Francisco); G. Dennish III,C. Harrington, and S. Larsen (Scripps Memorial Hospital andSan Diego Cardiovascular Associates, San Diego, Calif.); T.Donohue and B. Merkle (St. Louis University Medical Center,St. Louis); M. Slawsky, D. Gauthier, and L. Keane (Boston MedicalCenter and Boston Veterans Affairs Medical Center, Boston);J.M. Hare and M. Talbot (Johns Hopkins Hospital, Baltimore);R. Hershberger and T. Walker (Oregon Health Sciences Center,Portland); W.B. Hood, Jr., and J. Armstrong (University of RochesterMedical CenterStrong Memorial Hospital, Rochester, N.Y.);M. Ellis (Green Hospital of Scripps Clinic, La Jolla, Calif.);W. Kao and J. O'Sullivan (RushPresbyterianSt.Luke's Medical Center, Chicago); M. Kukin, C. Bucholz, and O.O'Campo (Mount Sinai Medical Center, New York); R. Lang andC. Griffis (University of Chicago Hospital, Chicago); M. Galvao(Jack D. Weiler Hospital of Albert Einstein College of Medicine,Bronx, N.Y.); C. Lui and R. Alves (University of Arizona, Tucson);C. Pepine and D. Leach (Shands Medical Center, University ofFlorida, Gainesville); J. Plehn and C. Carlson (DartmouthHitchcockMedical Center, Lebanon, N.H.); K. Roush and H. Cole (ToledoHospital, Toledo, Ohio); V.N. Udhoji and J. Dorman (West LosAngeles Veterans Affairs Medical Center, Los Angeles); P.J.Varghese and A. Nys (George Washington University Medical Center,Washington, D.C.); H.O. Ventura, M.R. Mehra, and B. Robichaux(Ochsner Clinic, New Orleans); and B. Gervers (University ofCincinnati Medical Center, Cincinnati). Comparative trial M. Arendt and E. Springer (Madigan Army Medical Center, Tacoma,Wash.); D.E. Bolster and K. Price (ColumbiaSummervilleMedical Center, Summerville, S.C.); A. Trimble (University ofAlabama at Birmingham, Birmingham); M. Bowles and P. Patterson-Midgley(Columbia Wesley Medical Center, Wichita, Kans.); A. Burgerand M. Burger (Beth Israel Deaconess Medical Center, Boston);J. Carley and D. Tracy (Memorial Hospital, Ormond Beach, Fla.);P. Carson and D. Lee (Veterans Affairs Medical Center, Washington,D.C.); P.S. Coleman and S. Campbell (Santa Rosa Memorial, SantaRosa, Calif.); L. Czer and L. Defensor (CedarsSinai MedicalCenter, Los Angeles); S. El Hafi and R. Keister (Spring BranchMedical Center, Houston); M. El Shahawy and B. Collentine-Smith(Doctors Hospital of Sarasota, Sarasota, Fla.); J. Johnson andP. Tummala (Los Angeles CountyUniversity of SouthernCalifornia Medical Center, Los Angeles); M. Ellestad and F.Swiger (Long Beach Memorial Medical Center, Long Beach, Calif.);R.D. Ensley and M. Thompson (Saint Francis Hospital, Tulsa,Okla.); R. Feldman and T. Saine (Munroe Regional Medical Center,Ocala, Fla.); D. Fishbein and R. Letterer (University of WashingtonMedical Center, Seattle); L. Ford and J.M. Birt (Roudebush VeteransAffairs Medical Center, Indianapolis); W. Gandy and J. Miller(St. Joseph's Hospital of Atlanta, Atlanta); J. Ghali and L.Sims (Louisiana State University Medical Center, Shreveport);E.M. Gilbert and K. Volkmann (University of Utah Health SciencesCenter, Salt Lake City); M. Greenspan and K. Morgan (Grand ViewHospital, Sellersville, Pa.); E. Harlamert and L. Tully (CommunityHospital East, Indianapolis); C. Buda (Columbia Memorial Hospital,Jacksonville, Fla.); P. Hoagland and S. Harte (Sharp MemorialHospital and Sharp Cabrillo Hospital, San Diego, Calif.); K.Cease (Green Hospital of Scripps Clinic, La Jolla, Calif.);R. Karlsberg and T. Gerez (Brotman Medical Center and MidwayHospital Medical Center, Beverly Hills, Calif.); S.N. Lanzaand P. Walker (Florida Hospital, Orlando); M. Galvao and J.Varela (Jack D. Weiler Hospital of Albert Einstein College ofMedicine, Bronx, N.Y.); T.B. Levine and J. Bolenbaugh (HenryFord Hospital, Detroit); W. Lewis and B. Pierce (Universityof California, Davis, Medical Center, Sacramento); C. Edgett(University of Rochester Medical Center, Rochester, N.Y.); S.Mallon and S. Gerity (Jackson Memorial Medical Center, Universityof Miami, Miami); P. McLaughlin and B. Lee (University Hospital,Columbia, Mo.); D. Hartley and K. Miller (Baptist Medical Centerand Baptist Medical CenterBeaches, Jacksonville, Fla.);R. Oren and L. Panther (University of Iowa Hospitals and Clinics,Iowa City); S. Promisloff and D. Jones (Tuality Community Hospital,Hillsboro, Oreg.); D.R. Schwartz and D. Marshall (Columbia RegionalMedical Center and Lee Memorial Health System, Fort Myers, Fla.);M.A. Silver and U. 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