What is the clinical evidence from this study?

Study design: Other. Population: Cardiac arrest (n=9). Intervention: Closed-chest massage (Thumper piston strokes) vs. Prearrest flow. Primary outcome: Coronary blood flow measured by electromagnetic cuff flow probes and radiomicrosphere technique.

What does this research mean for the field?

Closed-chest cardiopulmonary resuscitation generates coronary blood flow that occurs during the relaxation phase and increases with compression depth, but remains only a fraction of prearrest levels. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To measure the magnitude and timing of coronary blood flow during closed-chest cardiopulmonary resuscitation using two distinct measurement modalities.

August 17, 2026Circulation

Coronary blood flow during cardiopulmonary resuscitation in swine.

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Key result

Longer mechanical CPR strokes restore up to ~50% of baseline coronary flow during chest relaxation.

Population

9 anesthetized swine with cardiac arrest induced by electrical fibrillation

Comparison

Closed-chest massage using a Thumper device at… vs Comparison between different piston stroke…

Design

Preclinical

Authors

RBRonald F. BellamyUniversidad Mayor LDLeonides R DeGuzmanLetterman Army Medical Center DPDEAN C. PEDERSENLetterman Army Medical Center

Discussion

Member takes

Implication

In a swine model of cardiac arrest, coronary blood flow during closed-chest CPR is demonstrable and occurs during the relaxation phase, but its magnitude is only a fraction of normal prearrest flow.

Key Points

To measure the magnitude and timing of coronary blood flow during closed-chest cardiopulmonary resuscitation using two distinct measurement modalities.
Nine anesthetized swine (N=9) were instrumented with electromagnetic cuff flow probes and prepared for radiomicrosphere flow determination.
Ventricular fibrillation was electrically induced, followed by mechanical chest compression (Thumper) at 66 strokes/min across three compression depths (1.5, 2.0, and 2.5 inches).
Mean aortic pressure increased from 23 ± 4 mm Hg at 1.5 inches to 33 ± 5 mm Hg at 2 inches and 40 ± 6 mm Hg at 2.5 inches, while systemic blood flow rose from 525 ± 195 to 692 ± 202 and 817 ± 321 ml/min.
Coronary flow relative to prearrest levels scaled with compression depth across electromagnetic and radiomicrosphere methods: 1.5 inches yielded 12 ± 5% (EMF) vs. 16 ± 5% (RMS); 2 inches yielded 30 ± 6% vs. 26 ± 11%; 2.5 inches yielded 50 ± 12% vs. 40 ± 20%.
Phasic flow signals confirmed that all coronary perfusion took place exclusively during the relaxation phase of the compression cycle.

Structured PICO

Population

9 anesthetized swine undergoing electrically induced cardiac arrest and closed-chest massage to measure coronary blood flow.

Intervention

Closed-chest massage (CPR) using a Thumper device at 66 strokes/min with varying piston strokes (1.5, 2, and 2.5 inches)

Comparator

Comparison between different piston stroke lengths (1.5, 2, and 2.5 inches) and between two measurement methods (electromagnetic vs radiomicrosphere)

Outcome

Coronary blood flow and mean aortic pressuresurrogate

In a swine model of cardiac arrest, coronary blood flow during closed-chest CPR is demonstrable and occurs during the relaxation phase, but its magnitude is only a fraction of normal prearrest flow.

Cite This Study

Bellamy et al. (1984) studied Cardiac arrest (n=9). Closed-chest massage (Thumper piston strokes) vs. Prearrest flow was evaluated on Coronary blood flow measured by electromagnetic cuff flow probes and radiomicrosphere technique. Closed-chest massage in swine generated coronary blood flow that increased with longer piston strokes (up to 50% of prearrest flow with 2.5 inch stroke) and occurred during the relaxation phase.

synapsesocial.com/papers/6a827da9bfd4574fc2c8353d https://doi.org/10.1161/01.cir.69.1.174

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Implication

In a swine model of cardiac arrest, coronary blood flow during closed-chest CPR is demonstrable and occurs during the relaxation phase, but its magnitude is only a fraction of normal prearrest flow.

Coronary blood flow during cardiopulmonary resuscitation in swine.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Coronary blood flow during cardiopulmonary resuscitation in swine.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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