<prompt> The ideal treatment for hemothorax greater than 500 mlhour -Wait and watchNeedle aspirationIntercostal tubeOpen thoracotomy with ligation of vessels  <response>: Following are indications of thoracotomy in blunt chest trauma:Initial drainage of blood 1000 ml, especially if fresh.Continued brisk bleeding 100 ml15 minutes from the intercostal drainContinued bleeding of 200 mlhr for 3 hrsRupture of bronchus, aorta, esophagus or diaphragmCardiac tamponade if needle aspiration unsuccessful. 