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2.1
Apical Myocardial Infarction
Apical Heart Attack

The apical myocardial infarction is a subtype of the acute coronary syndrome, caused by myocardial ischemia. This particular type of infarction is subject to debate, given that its electrocardiography description does not always correlate with echocardiography findings. V1 to V4 abnormalities were considered to denote anteroseptal suffering, but other studies showed that the involvement of anteroapical and apical segments manifests with ECG changes in the same territory.

Presentation

The presentation of an apical myocardial infarction patient depends on whether the disease is acute or chronic. Acute patients have the usual complaints of cardiac ischemia patients. A strictly apical location implies that the mass of the affected myocardial tissue is relatively small, therefore the patient is unlikely to present in cardiogenic shock, but rather be a Killip class I case, with no evidence of heart failure. Pulmonary edema presentation is also unlikely. In return, the patient complains of chest pain that often radiates to the epigastrium or malaise. The pain is severe and lasts for 30 to 60 minutes. The character of the disease is different in different individuals, being described as a squeezing, burning, pressure, aching or sharp sensation. In other cases, myocardial ischemia can go unrecognized, as the patient believes he or she is suffering from indigestion or has no complaints whatsoever. This latter situation is more frequently seen in diabetes, dementia or elderly patients. Symptoms are more frequent during the early morning hours [1].

Patients with a previous apical myocardial infarction may have heart failure signs if the acute event was not strictly apical, but involved significant parts of neighboring walls and was complicated by aneurysm formation that occupies a significant ventricular territory. The anterior wall is more frequently implicated than the inferior and posterior ones.

Workup

The first step in addressing a non-critical myocardial infarction patient should be obtaining the history of the disease and assessing risk factors [2] [3]. Clinical examination should assess the skin (color and presence of diaphoresis), blood pressure, pulse (frequency, rhythm and equality in similar territories), heart and breathing sounds, the presence of gastrointestinal symptoms such as nausea and vomiting, neck vein aspect, temperature (fever is present during the first two days of evolution [4]) and urinary output.

Once the suspicion of an acute myocardial infarction is raised, electrocardiography is usually the first investigation performed. As discussed above, the apical localization is rather difficult to define by this method, but modifications do appear in contiguous leads.

The electrocardiogram also detects newly installed branch blocks, also an indicator of ischemia, and potentially life-threatening arrhythmias [5] [6].

The protocol states that cardiac enzymes (troponin, myoglobin and creatine kinase) should be measured in a serial manner [7] [8]. Recent guidelines advise that high-sensitive troponin I or troponin T assays should be used [9] [2]. Brain natriuretic peptide or N-terminal pro-B-type natriuretic peptide is only useful in chronic myocardial infarction patients for risk stratification and heart failure prognosis [10] [11].

The exact localization of the infarction area is stated by imaging methods. Echocardiography is a useful, readily available and reliable method that helps to evaluate wall motion abnormalities. Multidetector computed tomography and single-photon emission CT (SPECT) or positron emission tomography (PET) scanning, although viable methods, are not routinely used in triage settings, but are useful in detecting ventricular aneurysms [12]. Classic coronary catheterization has the advantage of offering clear diagnosis and being a therapeutic procedure, as well.

Treatment

Treatment for Apical Myocardial Infarction aims to restore blood flow to the affected area of the heart as quickly as possible. This can be achieved through medications such as thrombolytics, which dissolve blood clots, or procedures like percutaneous coronary intervention (PCI), where a balloon is used to open blocked arteries. In some cases, coronary artery bypass grafting (CABG) surgery may be necessary. Long-term management includes lifestyle changes, medications to prevent further clots, and cardiac rehabilitation.

Prognosis

The prognosis for patients with Apical Myocardial Infarction varies depending on the extent of the heart damage and the timeliness of treatment. Early intervention can significantly improve outcomes, reducing the risk of complications such as heart failure or arrhythmias. With appropriate treatment and lifestyle modifications, many patients can lead a normal life, although they may require ongoing medical supervision.

Etiology

The primary cause of Apical Myocardial Infarction is the blockage of a coronary artery due to atherosclerosis, a condition where fatty deposits build up on the artery walls. Other contributing factors include high blood pressure, high cholesterol, smoking, diabetes, obesity, and a sedentary lifestyle. Rarely, AMI can result from coronary artery spasm or dissection.

Epidemiology

Myocardial infarctions are a leading cause of morbidity and mortality worldwide. While specific data on Apical Myocardial Infarction is limited, it is considered less common than other types of heart attacks. Risk factors such as age, gender, family history, and lifestyle choices play a significant role in the prevalence of heart attacks in general.

Pathophysiology

In Apical Myocardial Infarction, the blockage of a coronary artery leads to reduced blood flow and oxygen supply to the heart's apex. This results in ischemia, a condition where the heart muscle is deprived of oxygen, leading to cell death and tissue damage. The extent of damage depends on the duration of the blockage and the presence of collateral circulation, which can provide alternative pathways for blood flow.

Prevention

Preventing Apical Myocardial Infarction involves addressing modifiable risk factors. This includes maintaining a healthy diet, engaging in regular physical activity, avoiding tobacco use, and managing conditions like hypertension, diabetes, and high cholesterol. Regular medical check-ups and adherence to prescribed medications can also help reduce the risk of heart attacks.

Summary

Apical Myocardial Infarction is a specific type of heart attack affecting the heart's apex. It is caused by a blockage in the coronary arteries, leading to heart muscle damage. Prompt diagnosis and treatment are crucial for improving outcomes. Prevention focuses on lifestyle changes and managing risk factors to reduce the likelihood of occurrence.

Patient Information

If you or someone you know is experiencing symptoms of a heart attack, such as chest pain, shortness of breath, or unusual fatigue, it is important to seek medical attention immediately. Understanding the risk factors and making healthy lifestyle choices can significantly reduce the risk of heart attacks. Regular check-ups with your healthcare provider can help monitor your heart health and prevent complications.

References

  1. Wijnbergen I, Van't Veer M, Pijls NH, et al. Circadian and weekly variation and the influence of environmental variables in acute myocardial infarction. Neth Heart J. 2012; 20 (9):354-9.
  2. Amsterdam EA, Wenger NK, Brindis RG, et al. 2014 AHA/ACC guideline for the management of patients with non-ST-elevation acute coronary syndromes: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. Circulation. 2014;130 (25):e344-426.
  3. Roffi M, Patrono C, Collet JP, et al. 2015 ESC Guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation: Task Force for the Management of Acute Coronary Syndromes in Patients Presenting without Persistent ST-Segment Elevation of the European Society of Cardiology (ESC). Eur Heart J. 2016; 37 (3):267-315.
  4. Kacprzak M, Kidawa M, Zielińska M. Fever in myocardial infarction: is it still common, is it still predictive?. Cardiol J. 2012;19 (4):369-73.
  5. O'Gara PT, Kushner FG, Ascheim DD, et al. American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. 2013 ACCF/AHA guideline for the management of ST-elevation myocardial infarction: a report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Circulation. 2013;127 (4):e362-425.
  6. Task Force on the management of ST-segment elevation acute myocardial infarction of the European Society of Cardiology (ESC); Steg PG, James SK, Atar D, et al. ESC Guidelines for the management of acute myocardial infarction in patients presenting with ST-segment elevation. Eur Heart J. 2012; 33 (20):2569-619.
  7. Storrow AB, Nowak RM, Diercks DB, et al. Absolute and relative changes (delta) in troponin I for early diagnosis of myocardial infarction: Results of a prospective multicenter trial. Clin Biochem. 2015;48 (4-5):260-7.
  8. Storrow AB, Christenson RH, Nowak RM, et al. Diagnostic performance of cardiac troponin I for early rule-in and rule-out of acute myocardial infarction: Results of a prospective multicenter trial. Clin Biochem. 2015;48 (4-5):254-9.
  9. Reichlin T, Irfan A, Twerenbold R, et al. Utility of absolute and relative changes in cardiac troponin concentrations in the early diagnosis of acute myocardial infarction. Circulation. 2011; 12. 124(2):136-45.
  10. Haaf P, Reichlin T, Corson N, et al. B-type natriuretic peptide in the early diagnosis and risk stratification of acute chest pain. Am J Med. 2011;124 (5):444-52.
  11. Thygesen K, Mair J, Mueller C, et al. Recommendations for the use of natriuretic peptides in acute cardiac care: a position statement from the Study Group on Biomarkers in Cardiology of the ESC Working Group on Acute Cardiac Care. Eur Heart J. 2012; 33 (16):2001-6.
  12. Cremer PC, Khalaf S, Agarwal S, et al. Myocardial perfusion imaging in emergency department patients with negative cardiac biomarkers: yield for detecting ischemia, short-term events, and impact of downstream revascularization on mortality. Circ Cardiovasc Imaging. 2014; 7 (6):912-9.
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