|Year : 2018 | Volume
| Issue : 1 | Page : 53-55
Recurrent ST-segment elevation myocardial infarction caused by coronary slow flow
Sanjeev Sanghvi, Anil Baroopal, Aditya Kumar, Rohit Mathur
Department of Cardiology, Dr. S. N. Medical College, Jodhpur, Rajasthan, India
|Date of Web Publication||24-Aug-2018|
Dr. Anil Baroopal
Room No. 102, PG Hostel, MDM Hospital, Dr. S. N. Medical College, Jodhpur, Rajasthan
Source of Support: None, Conflict of Interest: None
Coronary slow flow phenomenon is an angiographic clinical entity, characterized by delayed distal vessel opacification in the absence of significant epicardial coronary stenosis. Although it is well known to interventional cardiologists for approximately four decades, the pathogenic mechanisms are incompletely understood. Here, we present a case of typical chest pain with electrocardiographic changes suggesting recurrent ST-segment elevation myocardial infarction whose coronary angiography had normal coronaries with slow flow.
Keywords: Coronary angiography, coronary slow flow phenomenon, ST-segment elevation myocardial infarction
|How to cite this article:|
Sanghvi S, Baroopal A, Kumar A, Mathur R. Recurrent ST-segment elevation myocardial infarction caused by coronary slow flow. Indian Heart J Interv 2018;1:53-5
|How to cite this URL:|
Sanghvi S, Baroopal A, Kumar A, Mathur R. Recurrent ST-segment elevation myocardial infarction caused by coronary slow flow. Indian Heart J Interv [serial online] 2018 [cited 2019 Feb 21];1:53-5. Available from: http://www.ihji.org/text.asp?2018/1/1/53/239785
| Introduction|| |
Coronary slow flow phenomenon (CSFP) is an angiographic clinical entity, characterized by delayed distal vessel opacification in the absence of significant epicardial coronary stenosis and myocardial bridge. Although it is well known to interventional cardiologists for approximately four decades, the pathogenic mechanisms are incompletely understood. CSFP was first described by Tambe et al. in 1972. It has been reported that 1%–5.5% of patients who undergo coronary angiography experience CSFP.,In CSFP recurrent chest pain, ST-segment elevation myocardial infarction (STEMI), arrhythmias and sudden cardiac death have been reported.,,,,, In this report, we present a rare case of recurrent STEMI caused by CSFP in the index hospitalization.
| Case Report|| |
A 52-year-old male presented to the emergency department of our institution with complaint of chest pain radiating to the left upper limb for 2 days. He had no previous history of chest pain. He was a smoker and known hypertensive. He had no other conventional risk factors such as family history of coronary artery disease, diabetes mellitus, and hyperlipidemia. His blood pressure was 136/80 mmHg and heart rate was 86 beats/min. On examination, cardiovascular, respiratory, and other systems were normal. His electrocardiogram (ECG) showed ST-segment elevation in lead II, III, and aVF with ST-segment depression in anterior leads as shown in [Figure 1]. Transthoracic echocardiogram was performed which revealed concentric left ventricular (LV) hypertrophy with normal LV function without regional wall motion abnormality. His troponin I was positive. Diagnosis of acute inferior wall STEMI was made and treated. No primary percutaneous coronary intervention was performed as the patient refused, due to financial constraints. Recurrent angina was persisting despite being on all conventional medicines for acute coronary syndrome, so he was planned for coronary angiography. On angiography, coronaries were normal with slow flow in the right coronary artery (RCA), left anterior descending (LAD) artery, and left circumflex (LCx) artery as shown in Movie 1. Corrected thrombolysis in MI frame count (CTFC) of LAD, RCA, and LCx was 55.3, 44, and 48, respectively. Intravascular ultrasound imaging of coronary arteries was not done as this facility was not present at our center. He was put on medical management. The patient was comfortable after coronary angiography.
|Figure 1: Electrocardiogram tracing showing inferior wall myocardial infarction|
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The patient again had severe chest pain and uneasiness after 36h of coronary angiography. At this time, ECG showed ST-segment elevation in lead I, aVL, and V1–V6 as shown in [Figure 2]. Repeat transthoracic echocardiogram was performed which revealed hypokinesia of distal interventricular septum and anterior wall and LV systolic dysfunction with ejection fraction of 45%. As the pain was intolerable and not relieved by sublingual nitrate, he was thrombolyzed with streptokinase. After thrombolysis, his ECG showed resolution of ST-segment elevation as shown in [Figure 3]. Due to the presence of recurrent angina after 2 days despite being on all conventional medicines for acute coronary syndrome and appearance of regional wall motion abnormality with LV systolic dysfunction, he was planned for repeat coronary angiography. On the next day, on repeat angiography, coronaries were again normal with slow flow in LAD artery, RCA, and LCx artery as shown in Movie 2. The patient was then managed conservatively with medications. Subsequent transthoracic echocardiogram showed hypokinesia of distal interventricular septum with improvement in LV systolic function with ejection fraction of 50%–55%. The patient was then discharged in stable condition, being put on conventional medicines plus oral anticoagulants.
|Figure 2: Repeat electrocardiogram tracing showing anterior wall myocardial infarction|
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|Figure 3: Electrocardiogram showing resolution of ST-segment elevation after thrombolysis|
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| Discussion|| |
The exact pathophysiological mechanism of CSFP is not clear. Some underlying etiologies such as abnormally high microvascular resistance and widespread atherosclerosis of coronary arteries have been proposed. Recurrent chest pain is a commonly observed symptom in patients with CSFP. Most (80%) of the patients experience debilitating recurrent chest pain, commonly resulting in hospital readmission. The overall incidence of CSFP was 1%–5.5% among patients undergoing coronary angiography.,CSFP may also lead to life-threatening situations such as STEMI, ventricular arrhythmias, and sudden cardiac death.,,,, CTFC method is used to evaluate coronary blood flow. CSFP is defined as CTFC >2 standard deviations from the normal range of 21.1±1.5 for LAD artery, 20.4±3 for RCA, and 22.2±4.1 for LCx artery.
Different theories have been proposed regarding the cause of CSFP, but research has not been able to conclude its actual pathogenesis. In a variety of researches, small vessel disease, endothelial dysfunction, subclinical atherosclerosis, inflammation, and anatomic properties of coronary arteries have been reported as existing in association with CSFP. Among these, small vessel dysfunction is one of the most typical of the pathogenesis of CSFP.
In conclusion, the exact pathology of CSFP is not clear and CSFP is not a normal variant but a pathological entity. It not only leads to myocardial ischemia but also can cause STEMI requiring coronary angiography. Our patient suffered recurrent STEMI (inferior wall MI followed by anterior wall MI) within short duration despite being on low-molecular-weight heparin and dual antiplatelet therapy. Such a presentation of recurrent STEMI is very rare. No such case has been reported till date, to the best of our knowledge.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]