Myocardial Infarction (MI) Case Study (45 min)

Definition of Myocardial Infarction (MI)

Myocardial infarction, commonly known as a heart attack, is a critical medical event that occurs when the blood supply to the heart muscle is severely reduced or completely blocked. It is a leading cause of death worldwide and a significant public health concern.

Introduction to Myocardial Infarction (MI)

This nursing case study aims to provide a comprehensive understanding of myocardial infarction by delving into its various aspects, including its pathophysiology, risk factors, clinical presentation, diagnostic methods, and management strategies. Through the exploration of a fictional patient’s journey, we will shed light on the intricate nature of this life-threatening condition and highlight the importance of early recognition and intervention.

Background and Significance of Myocardial Infarction

Myocardial infarction is a sudden and often catastrophic event that can have profound consequences on an individual’s health and well-being. Understanding its underlying mechanisms and risk factors is essential for healthcare professionals, as timely intervention can be life-saving. This case study not only serves as a learning tool but also emphasizes the critical role of medical practitioners in identifying and managing myocardial infarctions promptly.

Pathophysiology of Myocardial Infarction

A crucial aspect of comprehending myocardial infarction is exploring its pathophysiology. We will delve into the intricate details of how atherosclerosis, the buildup of plaque in coronary arteries, leads to the formation of blood clots and the subsequent interruption of blood flow to the heart muscle. This disruption in blood supply triggers a cascade of events, ultimately resulting in the death of cardiac cells.

Risk Factors of Myocardial Infarction

Understanding the risk factors associated with myocardial infarction is vital for prevention and early detection. This case study will examine both modifiable and non-modifiable risk factors, including age, gender, family history, smoking, high blood pressure, diabetes, and high cholesterol levels. Recognizing these risk factors is instrumental in developing effective strategies for prevention and risk reduction.

Clinical Presentation Myocardial Infarction

Recognizing the signs and symptoms of myocardial infarction is crucial for timely intervention. We will present a fictional patient’s experience, illustrating the typical clinical presentation, which often includes chest pain or discomfort, shortness of breath, nausea, lightheadedness, and diaphoresis. Through this patient’s journey, we will highlight the importance of accurate symptom assessment and prompt medical attention.

Diagnostic Methods for Myocardial Infarction

Modern medicine offers various diagnostic tools to confirm a myocardial infarction swiftly and accurately. This case study will explore these diagnostic methods, such as electrocardiography (ECG), cardiac biomarkers, and imaging techniques like coronary angiography. By understanding these diagnostic modalities, healthcare professionals can make informed decisions and initiate appropriate treatments promptly.

Management Strategies for Myocardial Infarction

The management of myocardial infarction involves a multidisciplinary approach, including medication, revascularization procedures, and lifestyle modifications. We will discuss the fictional patient’s treatment plan, emphasizing the importance of reestablishing blood flow to the affected heart muscle and preventing further complications.

Nursing Case Study for Myocardial Infarction (MI)

Having established a foundational understanding of myocardial infarction, we will now delve deeper into Mr. Salazar’s case, tracing his journey through diagnosis, treatment, and recovery. This in-depth examination will shed light on the real-world application of the principles discussed in the introduction, providing valuable insights into the clinical management of myocardial infarction and its impact on patient outcomes.

Patient:

Mr. Salazar, a 57-year-old male, arrives at the Emergency Department (ED) with complaints of chest pain that began approximately one hour after dinner while he was working. He characterizes the discomfort as an intense “crushing pressure” located centrally in his chest, extending down his left arm and towards his back. He rates the pain’s severity as 4/10. Upon examination, Mr. Salazar exhibits diaphoresis and pallor, accompanied by shortness of breath (SOB).

Upon conducting a comprehensive assessment, it was observed that the patient exhibited no signs of jugular vein distention (JVD) or edema. Auscultation revealed normal heart sounds with both S1 and S2 present, while the lungs remained clear, albeit with scattered wheezes. The patient’s vital signs were recorded as follows:

• BP 140/90 mmHg SpO2 90% on Room Air
• HR 92 bpm and regular Ht 173 cm
• RR 32 bpm Wt 104 kg
• Temp 36.9°C

The 12-lead EKG report indicated the presence of “Normal sinus rhythm (NSR) with frequent premature ventricular contractions (PVCs) and three- to four-beat runs of ventricular tachycardia (VT).” Additionally, there was ST-segment elevation in leads I, aVL, and V2 through V6 (3-4mm), accompanied by ST-segment depression in leads III and aVF.

Cardiac enzyme levels were collected but were awaiting results at the time of assessment. A chest x-ray was also ordered to provide further diagnostic insights.

In response to the patient’s condition, the healthcare provider prescribed the following interventions:

• Aspirin: 324 mg administered orally once.
• Nitroglycerin: 0.4 mg administered sublingually (SL), with the option of repeating the dose every five minutes for a maximum of three doses.
• Morphine: 4 mg to be administered intravenously (IVP) as needed for unrelieved chest pain.
• Oxygen: To maintain oxygen saturation (SpO2) levels above 92%.

These interventions were implemented to address the patient’s myocardial infarction (heart attack) and alleviate associated symptoms, with a focus on relieving chest pain, improving oxygenation, and closely monitoring vital signs pending further diagnostic results.

Mr. Salazar’s chest pain was unrelieved after three (3) doses of sublingual nitroglycerin (NTG). Morphine 5 mg intravenous push (IVP) was administered, as well as 324 mg chewable baby aspirin. His pain was still unrelieved at this point

Mr. Salazar’s cardiac enzyme results were as follows:

CK 254 U/L

CK-MB 10%

Troponin I 3.5 ng/mL

Mr. Salazar was taken immediately to the cath lab for a Percutaneous Coronary Intervention (PCI). The cardiologist found a 90% blockage in his left anterior descending (LAD) artery. A stent was inserted to keep the vessel open.

Mr. Salazar tolerated the PCI well and was admitted to the cardiac telemetry unit for observation overnight. Four (4) hours after the procedure, Mr. Salazar reports no chest pain. His vital signs are now as follows:

• BP 128/82 mmHg SpO2 96% on 2L NC
• HR 76 bpm and regular RR 18 bpm
• Temp 37.1°C

Mr. Salazar will be discharged home 24 hours after his arrival to the ED and will follow up with his cardiologist next week. 

Linchpins for Myocardial Infarction Nursing Case Study

In summary, Mr. Salazar’s case highlights the urgency of recognizing and responding to myocardial infarction promptly. The application of vital signs, EKG, cardiac enzymes, and medications like aspirin, nitroglycerin, and morphine played a pivotal role in his care. Diagnostic tools like echocardiography and chest X-rays contributed to a comprehensive evaluation.

Nurses must remain vigilant and compassionate in such emergencies. This case study emphasizes the importance of adhering to best practices in the assessment, diagnosis, and management of myocardial infarction, with the ultimate goal of achieving favorable patient outcomes.