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The apex cardiogram (AKG) shows distinct differences in patients with coronary heart disease (KHK). The a-wave index is higher and point U occurs earlier in KHK patients compared to healthy individuals.
Area of Science:
- Cardiology
- Non-invasive cardiac diagnostics
Context:
- The apex cardiogram (AKG) is a recognized tool for detecting diastolic extrasounds.
- Left heart catheterization provides detailed hemodynamic data.
Purpose:
- To investigate the correlation between specific features of the apex cardiogram (AKG) and left heart catheterization results in patients with coronary heart disease (KHK).
- To compare AKG parameters between KHK patients and healthy controls.
Summary:
- The study analyzed 15 patients with KHK and 22 healthy controls.
- Key AKG parameters, including the a-wave index and the timing of point U during mechanical systole, were assessed.
- No correlation was found between point U position or second systolic wave height and left ventricular end-diastolic pressure (LVEDP) or dp/dt.
- However, KHK patients exhibited a significantly higher a-wave index (17.5% vs. 5.7%) and an earlier point U (42.5% vs. 62% of mechanical systole duration) compared to healthy individuals.
Impact:
- Findings suggest that specific AKG waveform characteristics can differentiate KHK patients from healthy individuals.
- These non-invasive findings may offer insights into diastolic function in coronary heart disease.
- Further research could explore the clinical utility of these AKG markers in managing KHK.
Abstract:
The value of the apex cardiogram (AKG) for identification of diastolic extrasounds is established. The present study attempts to correlate the so called a-wave index and the systolic portion of the AKG-curve with the results of left heart catheterisation in 15 patients with coronary heart disease (KHK). The position of point U (the lowest point between the first and the second systolic wave) during mechanical systole and the relative height of the second systolic wave do not correlate with LVEDP, dp/dt and the a-wave index. In contrast to a group of 22 healthy persons the a-wave index of the KHK-patients was significantly higher (17.5% vs. 5.7% on average) and the position of point U was significantly earlier (42.5% vs. 62% on average, of the duration of mechanical systole).