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Magnesium sulphate during transradial cardiac catheterization: a new use for an old drug?
Jonathan Byrne1, Mark Spence, Laurent Haegeli
1Division of Cardiology, King's College Hospital, Denmark Hill, London, SE5 9RS, United Kingdom. jonbyrne@yahoo.com
Insights
Intra-arterial magnesium effectively dilates the radial artery during cardiac catheterization, showing greater vasodilation than verapamil with no significant hemodynamic impact. This makes magnesium a superior choice for preventing radial artery spasm in transradial procedures.
Area of Science:
- Cardiology
- Vascular Medicine
- Interventional Cardiology
Background:
- Transradial coronary angiography is increasingly preferred due to its advantages over transfemoral approaches.
- Radial artery spasm remains a significant complication, often managed with vasodilatory agents.
- Magnesium sulfate's potential to mitigate radial artery spasm warrants investigation.
Purpose of the Study:
- To evaluate the efficacy of intra-arterial magnesium sulfate in preventing radial artery spasm during transradial cardiac catheterization.
- To compare the vasodilatory effects and hemodynamic impact of magnesium sulfate versus verapamil.
Main Methods:
- A prospective, double-blind, randomized trial involving 86 patients undergoing radial catheterization.
- Patients received either magnesium sulfate (150 mg) or verapamil (1 mg) intra-arterially.
- Radial artery dimensions were measured using Doppler ultrasound; spasm and pain were secondary endpoints.
Main Results:
- Both magnesium and verapamil increased radial artery diameter, with a significantly greater increase observed with magnesium (0.36 mm vs. 0.27 mm; p < 0.05).
- Verapamil administration led to a decrease in mean arterial pressure, while magnesium had no significant hemodynamic effect.
- The incidence of severe arm pain was similar between the magnesium and verapamil groups (27% vs. 30%; p = NS).
Conclusions:
- Magnesium sulfate is a more effective vasodilator than verapamil for the radial artery during cardiac catheterization.
- Magnesium sulfate offers advantages due to its comparable efficacy in preventing spasm and its lack of significant hemodynamic effects.
- The findings suggest magnesium sulfate is a favorable alternative to verapamil in transradial procedures.
Objective:
To assess the effect of intra-arterial magnesium on the radial artery during transradial cardiac catheterization.
Background:
Transradial coronary angiography has become popular in the last decade and offers several advantages over transfemoral angiography. Radial artery spasm is a major limitation of this approach, and a vasodilatory cocktail is usually given. The aim of this study was to examine the effect of magnesium sulphate on the radial artery during cardiac catheterization.
Methods:
This was a prospective, double-blind, randomized trial of 86 patients undergoing radial catheterization. Patients were randomized to receive magnesium sulphate (150 mg) or verapamil (1 mg) into the radial sheath. Radial dimensions were assessed using Doppler ultrasound. The primary endpoint of the study was a change in radial artery diameter following administration. Secondary endpoints included operator-defined radial artery spasm and patient pain.
Results:
Following administration of the study drug, there was an increase in radial artery diameter in both groups (p < 0.01), although the increase seen was greater in the group receiving magnesium (magnesium 0.36 +/- 0.03 mm; verapamil 0.27 +/- 0.03 mm; p < 0.05). Administration of verapamil resulted in a fall in mean arterial pressure (MAP) (change in MAP -6.6 +/- 1.4 mmHg; p < 0.01), whereas magnesium did not have a hemodynamic effect. Severe arm pain (pain score > 5) was observed in 14 (30%) patients receiving verapamil and 9 (27%) receiving magnesium (p = NS).
Conclusion:
This study demonstrates that magnesium is a more effective vasodilator when compared to verapamil, with a reduced hemodynamic effect, and is equally effective at preventing radial artery spasm. As such, the use of this agent offers distinct advantages over verapamil during radial catheterization.
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