1. Naegel's Rule: Answer Using 1st day of LMP. Subtract 3, and add 1 year and 7 days 2. Most common site for breast tumors: Answer Tail of Spence. 3. Respiratory distress in children: Answer When s/sx are present, the child is already introuble. Infants are nose breathers until about 3 months;decreased reserves.They compensate until they crash. 4. Pneumothorax: Answer collapsed lung, air in the pleural cavity. 5. Causes of pneumothorax: Answer Blunt or penetrating injury, foreign body, medicalprocedures, mechanical ventilation, lung disease. 6. Types of pneumothorax: Answer 1. Primary spontaneous = no underlying lung disease-young, male, thin, tall, smoker 2. Secondary spontaneous =underlying pulmonary disease. - air leaks into lung parenchyma and enters plural space. 3. Traumatic = due to trauma to lung tissue or chest 4. Tension = injury in chest wall. air enters pleural space on inspiration but doesn'tleave on expiration. Air builds, compressing lung