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Utilizing Percutaneous Ventricular Assist Devices in Acute Myocardial Infarction Complicated by Cardiogenic Shock
Published on: June 12, 2021
Bleeding in Patients With Infarct-Related Cardiogenic Shock: A DanGer Shock Substudy
Rikke Sørensen1, Jacob Eifer Møller2, Christophe Vandenbriele3
1Department of Cardiology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
Insights
The microaxial flow pump (mAFP) increased bleeding events in ST-elevation myocardial infarction and cardiogenic shock patients compared to standard care. Bleeding risk also rose with mechanical circulatory support complexity, with half occurring post-removal.
Area of Science:
- Cardiology
- Interventional Cardiology
- Mechanical Circulatory Support
Background:
- Microaxial flow pump (mAFP) shows promise for ST-elevation acute myocardial infarction with cardiogenic shock (STEMI-CS).
- mAFP use is linked to increased bleeding events, necessitating further investigation.
Purpose of the Study:
- To analyze bleeding events in STEMI-CS patients treated with mAFP versus standard care.
- To assess the relationship between bleeding and mechanical circulatory support (MCS) complexity.
Main Methods:
- The DanGer Shock trial randomized 355 STEMI-CS patients to mAFP or standard care.
- Bleeding was categorized using Bleeding Academic Research Consortium (BARC) types 3-5.
- Follow-up included assessment of bleeding during and after MCS use.
Main Results:
- mAFP group had significantly higher BARC 3-5 bleeding (26.3%) than standard care (15.3%) (P < 0.001).
- Bleeding risk increased with MCS complexity: mAFP (OR 4.94), VA-ECMO (OR 8.06), and combined mAFP+VA-ECMO (OR 27.40).
- Multivariable analysis identified mAFP use, renal replacement therapy, and VA-ECMO escalation as bleeding predictors.
Conclusions:
- Patients receiving mAFP experienced more severe bleeding than those on standard care.
- Bleeding events were associated with MCS complexity and frequently occurred after device removal.
Background:
The microaxial flow pump (mAFP) has demonstrated improved outcomes in selected patients with ST-segment elevation acute myocardial infarction and cardiogenic shock (STEMI-CS). However, its use has been associated with bleeding events.
Objectives:
The authors analyzed bleeding in the international multicenter randomized DanGer Shock (Danish German Shock) trial.
Methods:
A total of 355 patients with ST-segment elevation acute myocardial infarction and cardiogenic shock were randomized to either mAFP (n = 179) or standard care alone (n = 176). Bleeding events were classified according to Bleeding Academic Research Consortium (BARC) type 3-5.
Results:
In the mAFP group, 47 patients (26.3% [95% CI: 20.3%-33.2%]) experienced BARC type 3-5 bleeding, compared with 27 (15.3% [95% CI: 10.7%-21.4%]) in the standard care group; P < 0.001. Median follow-up was 121 days (Q1-Q3: 3-180 days). Among the 210 patients treated with any mechanical circulatory support (MCS), 2 of 74 bleeding events (2.7%) occurred in the cath lab, 35 (47.3%) while on MCS, and 37 (50.0%) after the MCS was removed. Bleeding increased with complexity of MCS: OR for BARC 3-5 bleeding with mAFP was 4.94 (95% CI: 2.30-10.65); P < 0.001, with venoarterial extracorporeal membrane oxygenation (VA-ECMO) 8.06 (95% CI: 2.81-23.09); P < 0.001, and with combined mAFP+VA-ECMO 27.40 (95% CI: 9.82-76.43); P < 0.001, no device as reference. Multivariable logistic regression identified use of mAFP, renal replacement therapy, and escalation to VA-ECMO as predictors of BARC type 3-5 bleeding.
Conclusions:
Patients randomized to mAFP experienced more bleeding than the standard care group. Bleeding was associated with the complexity of MCS, with one-half of the bleeding events occurring after device removal. (Danish Cardiogenic Shock Trial [DanShock]; NCT01633502).
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