Table 1

 Characteristics and autonomic test results of patients

Patient
1234
*Abnormal response.
Age/Sex38/M78/F54/F63/F
SymptomsPostural nausea;Postural nausea;Postural nausea;Postural nausea;
lightheadedness;lightheadedness;dizziness;lightheadedness
presyncopesyncopelightheadedness;weakness; fatigue;
syncopesyncope
Baseline heart rate (beats per minute)75667285
Baseline blood pressure (mm Hg)121/64142/74128/66180/92
Heart rate variation with respiration (average max-min)23 (>12 nl)10 (>7 nl)11 (>9 nl)6* (>7 nl)
Heart rate response to Valsalva manoeuvre1.33* (>1.5 nl)1.44 (>1.39 nl)1.19* (>1.47 nl)1.07* (>1.39 nl)
Highest heart rate response to tilt112*86104*108
Lowest blood pressure response to tilt112/60105/52*122/72114/62*
Highest heart rate response to five minute stand10684116110
Lowest blood pressure response to five minute stand116/68115/68*132/70128/64*