Acute myocardial infarction due to Kounis syndrome:A case report

BACKGROUND Acute myocardial infarction(AMI)can be induced by several factors.However,AMI induced by Kounis syndrome(an allergic reaction)is extremely rare and is highly susceptible to misdiagnosis.CASE SUMMARY A 70-year-old man presented after suffering an allergic reaction that caused chest pain triggered upon eating ice cream.Troponin I was found to be elevated,and an electrocardiogram showed ST-segment elevation.The diagnosis was AMI.He underwent two coronary angiographies,with one intravascular ultrasound during hospitalization showing no evidence of atherosclerotic coronary artery disease.The final diagnosis was vasospastic myocardial infarction due to Kounis syndrome.The patient was then treated with hydrocortisone and intravenous antihistamines,and his chest pain symptoms resolved.CONCLUSION Allergic reactions(such as Kounis syndrome)can cause serious damage to the heart.Physicians should be alert to the consequences and avoid misdiagnosis.

Polarization in ■ decays

Measurements of decay asymmetry parameters of charmed baryons,e.g.,■,provide more data to test the W-emission and W-exchange mechanisms controlled by strong and weak interactions.Taking advantage of the spin polarization in charmed baryon decays,we investigate the possibility to measure weak decay asymmetry parameters in thee^+e^-→■ process.We analyze the transverse polarization spontaneously produced in this process and the spin transfer in the subsequent■ decays.The sensitivity to measure the asymmetry parameters is estimated for the decay■→■.