The European Sudden Cardiac Arrest network (ESCAPE-NET) project aimed to identify potential risk factors for cardiac arrest. A study utilizing data from this network focused on two widely used dihydropyridine drugs: nifedipine and amlodipine. These medications are frequently prescribed to manage high blood pressure and angina (chest pain).
The research analyzed data from over 10,000 individuals taking dihydropyridines and 50,000 control subjects. The findings indicated that individuals taking high doses of nifedipine were significantly more likely to experience an out-of-hospital cardiac arrest compared to those not using dihydropyridines or those taking amlodipine.
Laboratory Insights
To explore the reasons behind the differing effects of nifedipine and amlodipine, scientists conducted laboratory experiments. Both drugs work by blocking L-type calcium channels, which can shorten the action potential of cardiac cells. This shortening, in turn, could potentially trigger arrhythmias leading to cardiac arrest. The in vitro studies revealed that high doses of nifedipine caused a more pronounced shortening of action potentials than high-dose amlodipine, aligning with the population study’s results.
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