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J Am Coll Cardiol, 2002; 39:798-803 © 2002 by the American College of Cardiology Foundation |



* Heart Failure Institute, Advocate Christ Medical Center, Oak Lawn, Illinois, USA
Scios Inc., Sunnyvale, California, USA
Cardiac Centers of Louisiana, Shreveport, Louisiana, USA
Los Angeles County-University of Southern California Medical Center, Los Angeles, California, USA
Manuscript received August 10, 2001; revised manuscript received November 21, 2001, accepted December 11, 2001.
* Reprint requests and correspondence: Dr. Marc A. Silver, Director, Heart Failure Institute, Advocate Christ Medical Center, 4440 West 95th Street, Suite 428 South, Oak Lawn, Illinois 60453, USA.
marc.silver{at}advocatehealth.com
| Abstract |
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BACKGROUND: Dobutamine is a commonly used inotropic treatment for CHF. Although dobutamine may have favorable hemodynamic and symptomatic effects, its use may be associated with side effects such as tachycardia, cardiac arrhythmias and myocardial ischemia. Nesiritide (B-type natriuretic peptide) is a new intravenous (IV) drug that produces hemodynamic and symptomatic improvement through balanced vasodilatory effects, neurohormonal suppression and enhanced natriuresis and diuresis.
METHODS: From an open-label randomized study of nesiritide versus standard care (SC) in patients with CHF requiring hospitalization, we compared short-term outcome data from patients given nesiritide (0.015 or 0.03 µg/kg per min) with a subgroup of SC patients given dobutamine. A total of 261 patients are included in this analysis.
RESULTS: Compared to dobutamine, both nesiritide doses were administered for a shorter total duration (p < 0.001), and the total duration of all IV vasoactive therapy (including study drug) was also shorter (p
0.012). Although there was no difference in LOS, there was a trend toward decreased readmissions in the two nesiritide groups (8% and 11%, respectively, vs. 20% in the dobutamine group). Six-month mortality was lower in the nesiritide groups.
CONCLUSIONS: Treatment of decompensated CHF with nesiritide may lead to lower healthcare costs and reduced mortality compared to treatment with dobutamine.
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Nesiritide, an intravenous (IV) form of human B-type natriuretic peptide (marketed as Natrecor, Scios, Inc., Sunnyvale, California), is the first in a new pharmacologic class of drug for treatment of decompensated congestive heart failure (CHF). Given parenterally, nesiritide causes cyclic guanosine monophosphate-mediated balanced arterial and venous dilation and may lead to neurohormonal suppression, natriuresis and diuresis (79). Recent evaluation of nesiritide in the treatment of acute decompensated CHF has demonstrated significant symptom improvement, in association with decreased preload and afterload and increased cardiac output, without a proarrhythmic effect (7,8).
To determine if treatment with nesiritide in hospitalized patients with decompensated CHF affected healthcare utilization or longer term outcomes compared to dobutamine, we examined length of stay (LOS), readmissions and six-month mortality data from a subgroup analysis prospective, randomized active-control trial.
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In this multicenter open-label (double-blind to nesiritide dose) study, patients were randomized to three treatment groups in a 1:1:1 ratio: 1) standard care (SC), an investigator-chosen single IV vasoactive agent; 2) nesiritide 0.015 µg/kg per min infusion, preceded by a 0.3 µg/kg IV bolus; or 3) nesiritide 0.030 µg/kg per min infusion, preceded by a 0.6 µg/kg IV bolus (Fig. 1). Standard care vasoactive agents included dobutamine, milrinone, nitroglycerin or nitroprusside. Investigators could add a second IV vasoactive agent (or substitute a new agent for the first choice) at their discretion, but nesiritide could not be given as the second agent to SC patients. The addition of a second IV vasodilator to nesiritide therapy was not permitted, but the former could be substituted for the latter. In all groups, dose changes and total duration of therapy were left to investigators discretion.
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| Discussion |
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Nesiritide versus dobutamine. Readmission for decompensated CHF is a common event for patients with advanced heart failure and can be affected by the adequacy of initial hospital care (10). The present study suggests that nesiritide may be more effective than dobutamine (shorter treatment course, fewer additional agents) and that these short-term benefits may have longer lived effects (reduced CHF rehospitalization and reduction in mortality). Although the exact mechanisms for the differential effects of nesiritide in this study are not entirely clear, they may include favorable neurohormonal changes and enhanced diuretic effect with nesiritide and/or unfavorable effects of dobutamine such as increased myocardial oxygen consumption, direct myocardial toxicity or arrhythmogenesis.
Pharmacoeconomic considerations. Decompensated CHF is a major cause of hospital admissions in the U.S. and is the leading cause of acute care hospital admissions for patients over the age of 65 years (1,2). Early improvement of symptoms due to hemodynamic compensation, diuresis and natriuresis is often achieved with parenteral therapy, followed by the transition to an appropriate outpatient regimen. Achieving these goals rapidly and economically is essential for improvement of patient care and control of the financial burden from this condition. Overall cost of care is a complex variable that is based not only on the cost of therapeutic agents and procedures, but also on resource utilization (level of care, treatment of serious complications, LOS, readmission rates), which in turn is affected by the efficacy and safety profiles of the therapeutics used.
Study limitations. The results of the study are limited by its open-label design, nonrandomized selection of therapies used in the SC group by the investigators and the relatively small number of patients in each subgroup. The dobutamine-treated patients had a higher incidence of ischemia and previous MI compared with the nesiritide-treated patients. Therefore, the choice of dobutamine as the SC agent by the investigator may have selected a sicker patient population for this subgroup. More information from a larger blinded study will be required to confirm the results of this study. In addition, the lack of a placebo group does not allow for the determination of whether the different outcomes observed between the treatment groups were due to a beneficial effect of nesiritide or a detrimental effect of dobutamine. Finally, although the current recommended dose of nesiritide is an infusion of 0.010 µg/kg per min (preceded by a 2 µg/kg bolus), in this study nesiritide was administered at doses one-and-a-half to three times higher.
Conclusions. This study demonstrated that the use of nesiritide was associated with a shorter treatment course, the use of fewer additional parenteral agents, reduced rehospitalization rate and a significantly lower mortality rate at six months (in the 0.015 µg/kg per min dose group) when compared to dobutamine. Thus, this study suggests that the short-term clinical benefits of nesiritide, the first in the new class of B-type natriuretic peptides for treatment of CHF, may be associated with decreased healthcare utilization costs and improved long-term survival, compared to the commonly used inotropic agent, dobutamine.
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| Footnotes |
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| References |
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