Title:Detection of Cognitive Impairment by Choice Auditory Reaction Time
(ART) and Visual Reaction Time (VRT)s during Acute Mental Stress in
Young Hypertensives: A Case Control Study
Volume: 18
Issue: 1
Author(s): Vitthal Khode*, Satish Patil, Girish Babu, Komal Ruikar and Sakshi Patel
Affiliation:
- Department of Physiology, SDM College of Medical Sciences & Hospital, Shri Dharmasthala Manjunatheshwara University,
Dharwad, India
Keywords:
Hypertension, cognition, reaction time, mental stress, auditory reaction time, visual reaction time.
Abstract:
Background: Acute stress is known to be associated with both negative and positive influences
on cognitive performance. Hypertension is one of the risk factors for lowered cognitive
performance. Mental stress testing is easier to administer and can be regulated by the investigator.
Mental arithmetic using serial subtraction is the most widely used method to administer stress. Reaction
time (RT) is widely used to assess cognitive domains like attention, execution and psychomotor
speed. Researchers have shown choice reaction times are delayed in hypertension. It is not
known whether acute mental stress improves or deteriorates attention, execution and psychomotor
speed in hypertension. We hypothesized in the present study that acute mental stress deteriorates
cognitive function in hypertensives without overt cerebrovascular disease or other vascular risk factors.
Methods: After getting medical ethical clearance from our institution, this case-control study was
carried out over eight months (January 2017 to September 2017). 60 subjects between the age
group of 35 to 55 years were included in the study. They were divided into 2 groups. Group 1 consisted
of 30 diagnosed cases of hypertension at least two years of duration. Group 2 consisted of 30
sex and age-matched controls. MMSE was performed to assess the cognitive function in these
groups. Simple (S) and choice (C) auditory reaction time (ART) and visual reaction time (VRT)s
were measured at rest and acute mental stress in these groups to assess cognitive function. Predictive
value of VRTC resting and VRTC during acute mental stress among hypertensives for cognitive
dysfunction was calculated using the receiver operating characteristic (ROC) curve.
Results: There was significant difference ART and VRT, both simple and choice, in hypertensive
and nonhypertensive subjects and these reaction times further increased during mental stress
(P<0.001). VRTC can be a predictor of cognitive dysfunction in hypertensives and during acute
mental stress.
Conclusion: A significant difference in cognitive functions in hypertensive and nonhypertensive
subjects exists and this further deteriorates with acute mental stress.