What question did this study set out to answer?

To determine whether assessing the biphasic wall thickening response during low- and high-dose dobutamine infusion improves the sensitivity and accuracy of detecting myocardial ischemia.

September 2, 2026Journal of the American College of CardiologyOpen Access

Enhanced detection of myocardial ischemia by stress dobutamine echocardiography utilizing the “biphasic” response of wall thickening during low and high dose dobutamine infusion

Q: What are the key findings of this study?

The biphasic response during dobutamine stress echocardiography detected myocardial ischemia in 98% of patients, compared to 56% using high-dose dobutamine echocardiography alone (p < 0.001).

Q: What is the clinical evidence from this study?

Study design: Cross-Sectional. Population: Coronary artery disease with wall motion abnormality (n=54). Intervention: Biphasic response during dobutamine stress echocardiography vs. High dose dobutamine echocardiography. Primary outcome: Detection of myocardial ischemia (p=< 0.001).

Q: What does this research mean for the field?

Incorporating the biphasic wall thickening response during dobutamine stress echocardiography significantly improves the detection of myocardial ischemia in patients with baseline wall motion abnormalities compared to high-dose dobutamine echocardiography alone. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

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Key result

Biphasic DSE response detects myocardial ischemia in 98% of patients, beating high-dose DSE alone.

P<0.001
n=54

Why the study?

Stress echocardiography is less sensitive than radionuclide perfusion imaging for detecting ischemia in patients with baseline wall motion abnormalities, where evaluating intermediate changes via the biphasic response may improve detection.

Does utilizing the biphasic response during stress dobutamine echocardiography improve the detection of myocardial ischemia compared to high dose dobutamine alone in patients with wall motion abnormalities?

Population

54 patients with a wall motion abnormality and documented coronary artery disease

Comparison

Biphasic response during graded dobutamine echocardiography vs high dose dobutamine echocardiography vs SPECT perfusion imaging

Design

Blinded diagnostic comparison study

Authors

RSRoxy SeniorNew York University ALAvijit LahiriCardiac Imaging

Discussion

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Implication

Utilizing the biphasic response during dobutamine stress echocardiography significantly enhances the detection of myocardial ischemia in patients with baseline wall motion abnormalities, matching the sensitivity of radionuclide perfusion imaging.

Key Points

To determine whether assessing the biphasic wall thickening response during low- and high-dose dobutamine infusion improves the sensitivity and accuracy of detecting myocardial ischemia.
Conducted dobutamine stress echocardiography with staged low-dose and high-dose pharmacological infusions.
Evaluated regional left ventricular wall thickening and contractile dynamics at baseline, low-dose infusion, and peak stress.
Identification of a biphasic response—characterized by initial contractile improvement at low doses followed by worsening dysfunction at high doses—significantly increased the diagnostic detection of ischemia.
Incorporating low-dose imaging alongside peak-dose protocols provided superior assessment of both myocardial viability and ischemic risk compared to high-dose evaluation alone.

Study Design

Type

Cross-Sectional (n=54)

Blinding

Blinded

Structured PICO

Population

54 patients with a wall motion abnormality and documented coronary artery disease undergoing dobutamine stress echocardiography and radionuclide perfusion imaging.

Exposure

Serial dobutamine stress echocardiography (5 to 40 micrograms/kg/min) utilizing the 'biphasic' response (initial improvement in wall thickening followed by reduced wall thickening)

Comparator

High dose dobutamine echocardiography alone, and radionuclide perfusion imaging with single-photon emission computed tomography (SPECT) using either technetium-99m sestamibi or technetium-99m tetrofosmin

Outcome

Detection of myocardial ischemiasurrogate

Main Result

Absolute Event Rate: 98% vs 56%

p-value: p=< 0.001

Cite This Study

Senior et al. (1995) conducted a cross-sectional in Coronary artery disease with wall motion abnormality (n=54). Biphasic response during dobutamine stress echocardiography vs. High dose dobutamine echocardiography was evaluated on Detection of myocardial ischemia (p=< 0.001). The biphasic response during dobutamine stress echocardiography detected myocardial ischemia in 98% of patients, compared to 56% using high-dose dobutamine echocardiography alone (p < 0.001).

synapsesocial.com/papers/6a97e9f30e613c950205a1f1 https://doi.org/10.1016/0735-1097(95)00139-q

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Enhanced detection of myocardial ischemia by stress dobutamine echocardiography utilizing the “biphasic” response of wall thickening during low and high dose dobutamine infusion

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

Enhanced detection of myocardial ischemia by stress dobutamine echocardiography utilizing the “biphasic” response of wall thickening during low and high dose dobutamine infusion

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

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