Do nothing, because this is an expected finding.-continuous gentle bubbling should be noted in the suction control chamber. immediately clamp the chest tube and notify the physician is incorrect. chest tubes should only be clamped to check for an air leak or when changing drainage devices (according to agency policy). checking for an air leak because the bubbling should be intermittent is incorrect. bubbling should be continuous and not intermittent. increase the suction pressure so that bubbling becomes vigorous is incorrect because bubbling should be gentle. increasing the suction pressure only increases the rate of evaporation of water in the drainage system.