2) Normal

Every one has a physiologic response to upright tilt. Therefore a "negative tilt test" is confusing. A normal response to upright tilt is shown. There is an increase in heart rate on the order of 15 beats per minute during the first 10 minutes of orthostasis. Heart rate continues to rise slowly thereafter. The upper limit for the heart rate increase is 30 beats per minute during the first 10 minutes in adults and somewhat greater in adolescents. systolic blood pressure often increases slightly. There is a large increase in diastolic blood pressure so that the pulse pressure is typically decreased. This goes along with a decrease in cardiac stroke volume.

 

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Normal
Postural Tachycardia Syndrome
Vasovagal Syncope
Dysautonomic Orthostatic Intolerance