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[Dependency of heart rate on contrast medium temperature and coronary angiographic severity in coronary angiography]
Insights
Contrast medium injection during coronary arteriography decreases heart rate. This effect is independent of contrast medium temperature but correlates with coronary artery stenosis severity.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Coronary arteriography is a key diagnostic tool for coronary heart disease.
- The influence of contrast medium properties, such as temperature, on physiological responses during the procedure requires further investigation.
Purpose of the Study:
- To investigate the effect of contrast medium temperature on heart rate changes during diagnostic coronary arteriography.
- To assess the relationship between the severity of coronary artery stenosis and heart rate variations post-contrast injection.
Main Methods:
- Diagnostic coronary arteriographies were performed on patients with varying degrees of coronary heart disease.
- Contrast medium (Urografin 76) at two temperatures (24°C and 34°C) was injected into the coronary arteries.
- Heart rate (sinus frequency) was monitored before and after contrast medium injection.
Main Results:
- Contrast medium injection into either coronary artery resulted in a significant decrease in heart rate (4.1-12.8%).
- The temperature of the contrast medium (24°C vs. 34°C) did not significantly alter the observed heart rate changes.
- A negative correlation was found between heart rate reduction and the severity of coronary artery stenosis.
Conclusions:
- Coronary arteriography induces a predictable decrease in heart rate, irrespective of contrast medium temperature.
- The degree of heart rate reduction appears linked to the extent of coronary artery stenosis, suggesting potential underlying physiological mechanisms.
- These findings are crucial for interpreting hemodynamic responses during coronary arteriography.
Abstract:
The influence of temperature (24 degrees C, 34 degrees C) of contrast medium (Urografin 76) on sinus frequency was studied during diagnostic coronary arteriographies in patients with different degree of coronary heart disease. 1. Injection of contrast medium in both coronary arteries was associated with a decrease of heart rate by 4.1-12.8%. There was no significant difference between the decrease in heart rate when injecting the contrast medium into the right or into the left coronary artery. 2. The change in heart rate during left and right coronary arteriography was independent from the temperature of the contrast medium (24 degrees C, 34 degrees C). Therefore, coronary arteriography made at 25 degrees C does not produce significant changes in heart rate when compared to coronary arteriography performed with contrast medium which has been warmed by 10 degrees C (34 degrees C). 3. Heart rate was decreased parallel to the increase in severity of coronary artery stenosis. The possible underlying mechanisms (changes in coronary artery perfusion pressure, hypoxic bradycardia) are being discussed.