A 60-year-old female was choking on a piece of steak. She became unresponsive, and bystanders dislodged it after performing chest compressions for 30 seconds. She now complains of pain in her chest. Her lungs are clear to auscultation. You should suspect:
1) Pneumothorax
2) Esophageal rupture
3) Myocardial infarction
4) Pulmonary embolism