[Left ventricular function with effort in the coronary patient. Study of the correlations with the data on echocardiography, effort ECG, and the teleheart. 2]
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Non-invasive methods like ECG and echocardiography can assess left ventricular function in coronary patients before invasive procedures. These techniques help identify specific hemodynamic patterns related to clinical findings and infarct location.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Physiology
Background:
- Assessing left ventricular function is crucial for managing coronary artery disease.
- Catheterization is invasive and carries risks.
- Non-invasive methods offer a safer alternative for evaluating cardiac function.
Purpose of the Study:
- To establish correlations between hemodynamic findings and non-invasive techniques in coronary patients.
- To determine the utility of clinical, ECG, and echocardiographic data in assessing left ventricular function.
- To identify reliable non-invasive predictors of hemodynamic patterns in coronary artery disease.
Main Methods:
- Correlating hemodynamic data with electrocardiography (ECG) at rest and during exercise.
- Utilizing chest X-rays (telethorax) and echocardiography for cardiac assessment.
- Analyzing clinical findings, including angina and infarct characteristics.
Main Results:
- Specific hemodynamic patterns correlate with clinical findings (angina, infarct type).
- ECG findings, such as extensive anterior infarcts, indicate distinct hemodynamic profiles.
- ST segment shifts during exercise suggest acute left ventricular dysfunction.
- Echocardiographic parameters (end-diastolic volume, ejection fraction, VCF) are linked to hemodynamic disturbances.
- Cardiothoracic ratio has limited predictive value except in specific post-infarct complications.
Conclusions:
- Non-invasive techniques (ECG, echocardiography, clinical assessment) can effectively evaluate left ventricular function in coronary patients.
- These methods provide valuable insights into hemodynamic status before invasive procedures.
- Integrating these non-invasive findings aids in comprehensive cardiac function assessment for coronary patients.
Abstract:
Correlations were established, for 30 coronary patients, between the haemodynamic findings and those adduced from non-invasive techniques - electrocardiography, both at rest and on exercise, telethorax, and echocardiography. Left ventricular function in the coronary patient can be assessed, even before catheterisation, by means of: 1. The clinical findings: angina of effort, an uncomplicated infarct, and an infarct with sequelae each has its own peculiar haemodynamic pattern at rest and on exercise; 2. The ECG finding of an extensive anterior infarct implies a haemodynamic picture vastly different from that with a limited posterior infarction; 3. The appearance of an ischaemic shift in the ST segment on exercise implies an acute malfunctioning of the left ventricle; 4. On the echocardiogram, an end-diastolic volume greater than 150 ml/m2, an ejection fraction less than 0.50 and VCF greater than 0.8 c/s are always accompanied by disturbances in the haemodynamics. By contrast, the cardio-thoracic ratio, except in post-infarct cases complicated by left ventricular failure, gives no predictive indication of cardiac function. These various examinations should therefore be applied to the coronary patient as an index of cardiac function.