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Related Concept Videos

Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
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The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
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Ischemic heart disease occurs when the heart's blood supply dwindles, causing an ominous lack of oxygen and nutrients. This deficiency, stemming from reduced or obstructed blood flow, spells danger, leading to heart muscle damage and dysfunction.
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Auscultation, an essential part of a heart examination, is done using a stethoscope. It provides crucial information about heart function and possible heart problems. Due to heart problems, abnormal sounds can be heard during systole or diastole. These sounds include S3 and S4 gallops, opening snaps, systolic clicks, and murmurs.
Abnormal Heart Sounds
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Left Coronary Artery Ligation: A Surgical Murine Model of Myocardial Infarction
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Why do we keep missing left circumflex artery myocardial infarctions?

Ryan Geffin1, Jeffrey Triska1, Salim Najjar1

  • 1Department of Medicine, Baylor College of Medicine, Houston, TX, USA.

Journal of Electrocardiology
|January 5, 2024
PubMed
Summary
This summary is machine-generated.

Diagnosing left circumflex artery (LCx) myocardial infarctions (MI) is challenging. Subtle ECG changes in patients with LCx OMI, especially proximal lesions, can delay critical reperfusion therapy.

Keywords:
Electrocardiogram (ECG)Left circumflex infarctionNon-ST elevation myocardial infarction (NSTEMI)Occlusion myocardial infarctionST-elevation myocardial infarction (STEMI)

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Area of Science:

  • Cardiology
  • Medical Diagnostics
  • Interventional Cardiology

Background:

  • Electrocardiogram (ECG) diagnosis of left circumflex artery (LCx) myocardial infarctions (MI) presents a persistent challenge.
  • Subtle or absent ST-segment changes on ECG can complicate the identification of LCx occlusions.

Purpose of the Study:

  • To investigate ECG patterns associated with acute occlusion myocardial infarction (OMI) in the LCx artery.
  • To correlate LCx lesion location with ECG findings and reperfusion therapy delays.

Main Methods:

  • Retrospective observational study of 58 patients with acute LCx OMI.
  • Analysis of electronic medical records, cardiac biomarkers, coronary angiography, and 12-lead ECGs.
  • Classification of ECGs and correlation with LCx lesion anatomy (proximal/distal to first obtuse marginal artery).

Main Results:

  • Patients with LCx OMI proximal to the first obtuse marginal artery, particularly those with left or codominant circulation, often showed no or subtle ST-segment changes.
  • These subtle ECG findings were associated with delays in reperfusion therapy.

Conclusions:

  • "Classic" ST-segment elevation indicative of MI may be absent in LCx OMI, especially with proximal lesions and specific coronary circulation patterns.
  • Cancellation forces in limb leads can obscure typical ECG findings, necessitating heightened clinical suspicion for LCx OMI.