See also: 85% of hospital admissions for chest pain are NOT heart attack. 1  3. Cough: persistent coughing or wheezing can be a symptom of heart failure. 2  4. Dizziness: heart attacks or heart rhythm abnormalities can cause light-headedness or even loss of consciousness.
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How accurate is the test? The test is fairly sensitive to the presence of drugs in the urine. This means that if drugs are present, you will usually get a preliminary positive result. If you get a preliminary positive result, you should send the urine sample to the laboratory for a second, more accurate test. It is very important to send the urine sample to the lab, because the drug of abuse urine screening may give positive results when no drugs are actually present.