Halstead Maneuver (See picture appendix 4): The Reverse-Adson Maneuver, or Halstead Maneuver, is also done with the patient's arm externally rotated and extended with the elbow extended. The examiner monitors the radial pulse as the patient rotates the head away from the affected side and extends the neck. The patient is instructed to take a deep breath and hold it. The absence or disappearance of a pulse indicates a positive test a suggesting the presence of a cervical rib (Magee DJ, 2008)