What is the clinical evidence from this study?

Study design: Observational. Population: Severe congestive heart failure (CHF) (n=28). Intervention: Dobutamine vs. Normal subjects. Primary outcome: Left ventricular (LV) isovolumic relaxation rate.

What question did this study set out to answer?

This research aimed to evaluate the effects of dobutamine on isovolumic relaxation in normal subjects versus those with congestive heart failure (CHF).

September 1, 1991CirculationOpen Access

Effects of beta-adrenergic stimulation with dobutamine on isovolumic relaxation in the normal and failing human left ventricle.

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Key result

In a study of 28 subjects, beta-adrenergic stimulation with dobutamine caused significant and comparable acceleration of left ventricular isovolumic relaxation in both normal and severe CHF patients.

Why the study?

Does dobutamine infusion improve left ventricular isovolumic relaxation in patients with severe congestive heart failure compared to normal subjects?

Key Points

This research aimed to evaluate the effects of dobutamine on isovolumic relaxation in normal subjects versus those with congestive heart failure (CHF).
Infused beta-adrenergic agonist dobutamine via intracoronary and intravenous routes in 28 subjects (14 normal and 14 CHF patients).
Assessed left ventricular (LV) isovolumic relaxation using Weiss (TL), Mirsky (T1/2), and nonlinear regression (TNL) techniques.
In CHF patients, the positive inotropic response to dobutamine was significantly reduced compared to normal subjects.
LV isovolumic relaxation was significantly prolonged in CHF patients across all assessment methods.
Despite differences in positive inotropic response, dobutamine significantly accelerated LV isovolumic relaxation in both normal subjects and CHF patients.

Study Design

Type

Observational (n=28)

Structured PICO

Does dobutamine infusion improve left ventricular isovolumic relaxation in patients with severe congestive heart failure compared to normal subjects?

Population

28 subjects, comprising patients with severe congestive heart failure (n=18) and normal subjects without left ventricular dysfunction or congestive heart failure (n=10).

Intervention

Dobutamine infusion (administered via intracoronary route in 14 subjects and intravenous route in 14 subjects).

Comparator

Normal subjects without left ventricular dysfunction or congestive heart failure.

Outcome

Left ventricular (LV) isovolumic relaxation rate (assessed by the methods of Weiss, Mirsky, and a nonlinear regression technique).surrogate

Beta-adrenergic stimulation with dobutamine preserves its positive lusitropic effect (acceleration of left ventricular relaxation) in patients with severe heart failure, despite an attenuated positive inotropic response.

Discussion

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Implication

Supports preserved lusitropic effects of dobutamine in severe CHF; hypothesis-generating for clinical translation in larger studies.

Cite This Study

Parker et al. (1991) conducted an observational in Severe congestive heart failure (CHF) (n=28). Dobutamine vs. Normal subjects was evaluated on Left ventricular (LV) isovolumic relaxation rate. In a study of 28 subjects, beta-adrenergic stimulation with dobutamine caused significant and comparable acceleration of left ventricular isovolumic relaxation in both normal and severe CHF patients.

synapsesocial.com/papers/6a07e283416812afca06e583 https://doi.org/10.1161/01.cir.84.3.1040

Topics

Heart failure HFrEF treatment

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Effects of beta-adrenergic stimulation with dobutamine on isovolumic relaxation in the normal and failing human left ventricle.

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

Topics

Effects of beta-adrenergic stimulation with dobutamine on isovolumic relaxation in the normal and failing human left ventricle.

Key Points

Study Design

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Topics

Also Consider