08-08-2010, 09:01 AM
Q.
A 54-y-o man is brought to the emergency department 15 minutes after the abrupt onset of crushing substernal chest pain. He appears in distress. His pulse is 98/min, RR are 24/min, and BP is 104/56 mm Hg. Cardiac examination shows an S3 gallop. An ECG shows a 6-mm anterior ST segment elevation and isolated premature ventricular contractions. Following placement of a coronary stent and restoration of blood flow, he develops an idioventricular rhythm. Which of the following is the most likely underlying cause of this abnormal rhythm?
A) Activation of free radical scavenging systems
B) Decreased lipid peroxidation
C) Generation of reactive oxygen species
D) Inactivation of free radical scavengeing systems
E) Increased calbindin concentration
A 54-y-o man is brought to the emergency department 15 minutes after the abrupt onset of crushing substernal chest pain. He appears in distress. His pulse is 98/min, RR are 24/min, and BP is 104/56 mm Hg. Cardiac examination shows an S3 gallop. An ECG shows a 6-mm anterior ST segment elevation and isolated premature ventricular contractions. Following placement of a coronary stent and restoration of blood flow, he develops an idioventricular rhythm. Which of the following is the most likely underlying cause of this abnormal rhythm?
A) Activation of free radical scavenging systems
B) Decreased lipid peroxidation
C) Generation of reactive oxygen species
D) Inactivation of free radical scavengeing systems
E) Increased calbindin concentration
