Noninvasive detection of anterior wall asynergies by cardiokymography compared to electrocardiography
Insights
Cardiokymography (CKG) shows moderate sensitivity and specificity for detecting left ventricular (LV) anterior wall asynergies. While electrocardiography (ECG) alone is more appropriate, combining CKG and ECG may improve diagnostic accuracy.
Area of Science:
- Cardiology
- Medical Imaging
- Diagnostic Techniques
Background:
- Left ventricular (LV) anterior wall asynergies are crucial indicators of cardiac dysfunction.
- Noninvasive methods for detecting these abnormalities are essential for timely diagnosis and treatment.
- Cardiokymography (CKG) and electrocardiography (ECG) are commonly used noninvasive diagnostic tools.
Purpose of the Study:
- To evaluate the diagnostic value of cardiokymography (CKG) in detecting left ventricular (LV) anterior wall asynergies.
- To compare the sensitivity and specificity of CKG with ECG for identifying regional contraction abnormalities.
- To assess the combined diagnostic utility of CKG and ECG.
Main Methods:
- 80 consecutive patients underwent CKG and ECG prior to coronary angiography.
- Quantitative LV angiography was used for validation of regional contraction abnormalities.
- Stepwise linear discriminant analysis was applied to assess the diagnostic power of CKG.
Main Results:
- CKG sensitivity for LV anterior wall asynergy was 67.9% (ECG: 39.6%) and specificity was 68.4% (ECG: 94.7%) at 1 SD.
- At 2 SD, CKG sensitivity was 65.6% (ECG: 56.3%) and specificity was 47.5% (ECG: 90%).
- Combined CKG and ECG testing increased specificity to 98.3% but decreased sensitivity to 26.9%.
Conclusions:
- ECG alone appears more appropriate for detecting LV anterior wall asynergies.
- Combined use of CKG and ECG can significantly enhance diagnostic accuracy, particularly in intermediate prevalence ranges.
- CKG provides valuable complementary information to ECG for diagnosing LV anterior wall asynergies.
Abstract:
In order to determine the value of cardiokymography in detecting left ventricular (LV) anterior wall asynergies, 80 consecutive patients had a cardiokymogram (CKG) and an electrocardiogram (ECG) on the day prior to coronary angiography. Technically adequate CKGs were obtained in 72 patients (67 men and 5 women, mean age 53 +/- 6.5 years). For validation of regional contraction abnormalities, quantitative LV angiography was used. Stepwise linear discriminant analysis was applied to investigate the diagnostic power of CKG. Sensitivity of the CKG for LV anterior wall asynergy was 67.9% (ECG: 39.6%) and specificity was 68.4% (ECG: 94.7%) on the basis of 1 SD of the mean values of the radial axis shortening of a control group. For 2 SD, the sensitivity was 65.6% (ECG: 56.3%) and the specificity 47.5% (ECG: 90%). By combined testing, the specificity increased to 98.3%, whereas the sensitivity dropped to 26.9%. The improvement of the post-test likelihood for a positive ECG by a positive CKG is especially pronounced in the intermediate prevalence range, whereas for a negative ECG the post-test likelihood can be further decreased by a negative CKG in the intermediate and high prevalence range. The ECG as a single test seems to be the more appropriate noninvasive method for detecting LV anterior wall asynergies; however, the combined use of both ECG and CKG may considerably improve the diagnostic accuracy.
Related Concept Videos
01:29Electrocardiogram
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:25Correlation between ECG and Cardiac Cycle
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
01:28Electrocardiogram Fundamentals
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
01:17Imaging Studies for Cardiovascular System I:Echocardiography
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion, evaluates...
01:30Acute Coronary Syndrome III: Diagnostic Studies
01:30Dysrhythmias V: Evaluating Dysrhythmias