Quaaludes were originally prescribed for things like sleeplessness and anxiety, but have since been made illegal because of their addictiveness. Methaqualone is classified as a hypnotic sedative and was originally prescribed to treat anxiety and relax muscles.uaaludes were originally prescribed for things like sleeplessness and anxiety, but have since been made illegal because of their addictiveness. Methaqualone is classified as a hypnotic sedative and was originally prescribed to treat anxiety and relax muscles.
1 Serum levels increase within 3-12 hours from the onset of chest pain, peak at 24-48 hours, and return to baseline over 5-14 days. 2  Troponin levels may not be detectable for six hours after the onset of myocardial cell injury. 3  The most sensitive early marker for myocardial infarction is myoglobin.
So detection of elevated serum cardiac enzymes is more important than ECG changes. However, the cardiac enzymes can only be detected in the serum 5-7 hours after the onset of the myocardial infarction. So, especially in the first few hours after the myocardial infarction, the ECG can be crucial.