Effect of Perioperative Ultrasound-guided Remote Ischemic Conditioning on Acute Myocardial Infarction

Not Applicable

• Conditions: Acute Myocardial Infarction

• Registration Number: NCT05044806
• Lead Sponsor: The First Affiliated Hospital with Nanjing Medical University

Brief Summary

Acute myocardial infarction (AMI) is an event of myocardial necrosis caused by myocardial ischemia. Although the incidence and economic burden of AMI has declined in high-income countries, the incidence rate of AMI in China has increased dramatically over the past several decades. Initial medical therapy combined with primary percutaneous coronary intervention (PCI) is currently the most important advance in restoring coronary perfusion. Timely reperfusion therapy may halt the progress of necrosis and preserve viable tissue; however, it can also induce myocardial injury and cause cardiomyocyte death, a phenomenon called myocardial ischemia reperfusion injury (IRI), which can increase final myocardial infarct size by up to 50%. Unfortunately, there is no effective intervention for preventing IRI to date, though an improved understanding of the pathophysiology of IRI has led to the suggestion of several innovative therapeutic strategies with the potential for reducing unintended negative side effects of reperfusion therapy in AMI patients. Whether there is a therapeutic intervention that can effectively and safely reduce myocardial infarct size and cardiac mortality has been intensely explored over the years. Against this backdrop, a phenomenon called remote ischemic conditioning (RIC) has long been discussed as a potential approach to address the above issues. The purpose of present study is to investigate the efficacy of perioperative remote ischemic conditioning delivered at individual timepoints (e.g., pre-, per- and post-PCI) on myocardial injury in patients with AMI.

Detailed Description

RIC refers to a cardio-protective effect induced by non-invasively applying cycles of physiological ischemia and reperfusion to remote body parts, e.g., through application of a blood pressure cuff or similar device to a remote limb. The actual molecular biological mechanisms underlying RIC may be attributed to a neuro-hormonal pathway conveying a cardio-protective signal from a local limb to the remote heart. The safety of RIC delivered at a single time point (e.g., pre-, per- or post-PCI) in AMI patients has been well established in a number of clinical trials. However, the RIC's cardio-protective effects remain under debate, especially for RIC programs delivered at individual timepoints during operative period (pre-, per- and post-PCI). Besides, in these trials, the cuff compression pressure of RIC protocol is mostly 200mmHg or 20-50mmHg above systolic pressure. Peripheral vascular ischemia effects of upper limbs are different under different pressure conditions. However, no study has been conducted to investigate the clinical effects of RIC training under different pressure conditions. In the present study, ultrasound is used to determine the brachial artery total occlusion pressure (TOP), which is regarded as optimal pressure of flow restriction in ischemic exercise training. And patients in the ultrasound-guided RIC group will receive RIC applying TOP as cuff compression pressure, while compression pressure applied in traditional RIC group patients is 20mmHg above systolic pressure. The purpose of present study is to investigate the effect of perioperative RIC delivered across the full disease cycle, and compare the effects of ultrasound-guided RIC protocol and traditional RIC protocol on cardiac enzyme infarct size, cardiac function, cardiopulmonary endurance and quality of life in patients with AMI.

Study Timeline

• Study Start: 2021-09-01
• Study First Submitted: 2021-09-01
• Study First Submitted QC: 2021-09-13
• Study First Posted: 2021-09-16
• Status Verified: 2021-11
• Last Update Submitted: 2021-11-10
• Last Update Posted: 2021-11-11
• Primary Completion: 2022-12
• Study Completion: 2022-12

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 60

Inclusion Criteria

1. Newly developed ST segment elevation myocardial infarction (STEMI) and non-ST segment elevation myocardial infarction (non-STEMI) according to clinical symptoms, ECG and laboratory confirmation;
2. Patients aged 18-80 yr;
3. Scheduled for PCI;
4. With normal cognitive function indicated by MMSE score >16 and able to cooperate with intervention;
5. Agreed to participate and signed the consent form.

Exclusion Criteria

1. Previous STEMI or non-STEMI;
2. Previous coronary artery bypass grafting (CABG) ;
3. Developed thrombolysis within the last 30 days;
4. Cardiogenic shock history;
5. Persistent atrial fibrillation history;
6. Severe complications (e.g. ventricular septal rupture, free wall rupture or acute severe mitral regurgitation) warrant surgical interventions;
7. Uncontrolled hypertension (systolic blood pressure >160mmHg or diastolic blood pressure >100mmHg);
8. With peripheral neuropathy, peripheral artery disease, superficial thrombophlebitis or deep vein thrombosis;
9. Other severe systemic diseases;
10. Participated in other trials previously.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Infarct size	During 0-72 hours after surgery	Cardiac enzyme infarct size is assessed as 72-hour area under the curve (AUC) cardiac troponin T (cTnT) release.

Secondary Outcome Measures

Name	Time	Method
Plasma concentration of myocardial infarction-related key biomarkers (PCMIKB)	Three days after surgery	PCMIKB will be reflected with concentration of cardiac troponin T (cTnT).
Total hospital length of stay (LOS)	Up to 1 month	LOS accounts for total hospital LOS in both acute hospital and rehabilitation hospital after PCI.
B-type natriuretic peptide （BNP）	Three days after surgery	The concentration of BNP will be measured during perioperative period.
Left ventricular end-diastolic volume (LVEDV)	One week after surgery	Left ventricular end-diastolic volume (LVEDV) will be measured with two dimensional echocardiography.
Left ventricular end systolic volume (LVESV).	One week after surgery	Left ventricular end systolic volume (LVESV) will be measured with two dimensional echocardiography.
Cardiopulmonary endurance	Three days after surgery	Cardiopulmonary endurance will be measured with the 6-min walking test (6MWT).
Left ventricular ejection fraction (LVEF)	One week after surgery	Left ventricular ejection fraction (LVEF) will be measured with two dimensional echocardiography.
Blood pressure	When postoperative RIC is finished（within 10 minutes after PCI）	Systolic and diastolic blood pressure will be monitored before and after training.
Heart rate	When postoperative RIC is finished（within 10 minutes after PCI）	Heart rate will be monitored before and after training.

Trial Locations

Locations (1)

The First Affiliated Hospital of Nanjing Medical University; 🇨🇳 Nanjing, Jiangsu, China