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  Indian J Med Microbiol
 

Figure 1: (a) A normal Patient performing Deep breathing manoeuvre. In above patient Vagal tone is intact, (b) Patient performing Valsalva manoeuvre, VR showing various phases (I to IV), c) and d) Normal patient's Heart rate recording during orthostatic test. VR: Valsalva ratio

Figure 1: (a) A normal Patient performing Deep breathing manoeuvre. In above patient Vagal tone is intact, (b) Patient performing Valsalva manoeuvre, VR showing various phases (I to IV), c) and d) Normal patient's Heart rate recording during orthostatic test. VR: Valsalva ratio