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Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...
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Acute Coronary Syndrome (ACS) encompasses a spectrum of heart conditions caused by sudden obstruction of coronary arteries, typically resulting from the rupture of an atherosclerotic plaque and subsequent thrombus (blood clot) formation. This obstruction can lead to partial or complete blockage of blood flow, causing varying degrees of myocardial ischemia or infarction.ACS includes the following clinical entities:Unstable Angina (UA)Non-ST-Elevation Myocardial Infarction (NSTEMI)ST-Elevation...
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The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
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Angina, also known as angina pectoris, is a chest pain resulting from diminished blood flow to the heart muscle and is often a symptom of coronary artery disease. Angina presents several variants with distinctive attributes, etiologies, and therapeutic approaches. The main types of angina include stable, unstable, variant (Prinzmetal's), microvascular, intractable, and silent ischemia.Stable angina is caused by atherosclerosis, which leads to the formation of plaques that narrow the coronary...
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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Refractory Acute Myocardial Infarction Cardiogenic Shock Due to Left Ventricular Outflow Tract Obstruction.

Oludamilola Akinmolayemi1, Frans J Beerkens1, Vivian Hu2

  • 1Mount Sinai Fuster Heart Hospital, New York, New York, USA.

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Summary

Cardiogenic shock (CS) after heart attack can be worsened by standard treatments. Recognizing left ventricular outflow tract obstruction (LVOTO) with echocardiography is key for effective CS management.

Keywords:
cardiogenic shockechocardiographyleft ventricular outflow tract obstructionmechanical circulatory supportmyocardial infarction

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Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Echocardiography

Background:

  • Optimal management of cardiogenic shock (CS) following acute myocardial infarction (AMI) typically involves inotropes and mechanical circulatory support.
  • However, this standard approach may be detrimental in specific CS phenotypes, necessitating a re-evaluation of treatment strategies.

Observation:

  • A case of a 75-year-old female with anterior descending artery AMI presented with worsening CS despite intra-aortic balloon pump and inotrope therapy.
  • Echocardiography revealed unrecognized left ventricular outflow tract obstruction (LVOTO) caused by an apical aneurysmal infarct and hyperdynamic basal segments.

Findings:

  • Prompt echocardiography-guided adjustment of mechanical circulatory support and inotropes led to hemodynamic improvement.
  • This suggests dynamic LVOTO is an underrecognized complication of anterior-wall AMI-CS.

Implications:

  • Clinical vigilance and echocardiography are crucial for identifying patients with AMI-CS predisposed to LVOTO.
  • Recognizing and managing dynamic LVOTO can prevent counterintuitive hemodynamic deterioration caused by standard therapies.