Time domain measures of heart rate variability during acute mental stress in Type 2 diabetics- A case control study

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National Journal of Physiology, Pharmacy and Pharmacology, ISSN: 2320-4672, Vol: 4, Issue: 1, Page: 34-38

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10.5455/njppp.2014.4.080720131; 10.5455/njppp.2014.4. 080720131
Anupama Deepak; Shobha Nallulwar; Vitthal Khode; A. N. Deepak
ScopeMed International Medical Journal Management and Indexing System
Biochemistry, Genetics and Molecular Biology; Pharmacology, Toxicology and Pharmaceutics
article description
Background: Cardiovascular Autonomic Diabetic Neuropathy (CADN) is one of the most important diabetes-associated complications. Reduced heart rate variation (HRV) is the earliest indicator of CADN. The prospect of using time domain analysis of HRV using mental arithmetic as a stressor has for early diagnosis of CADN has not been studied so far. Aims & Objective: To compare time domain parameters of HRV at rest and during acute mental stress between Type 2 diabetics and non- diabetics. Materials and Methods: 30 male asymptomatic, Type 2 diabetics with duration of diabetes of 2-8 yrs with RBS ≥ 200 mg/dl or FBS ≥ 126 mg/dl in the age group of 30-65 yrs were chosen as subjects. 30 age and sex matched healthy non- diabetics were chosen as controls. HRV analysis was done using ECG recorded at rest in supine position for 5 min and during 5 min of acute mental stress testing. Results: At rest standard deviation of all R-R intervals (SDNN), root mean square of successive RR- interval differences (RMSSD), number of intervals differing by > 50ms from adjacent interval (NN50) and percentage of NN50 (pNN50) were significantly less in diabetics as compared to non- diabetics. Mental stress showed increases in HR, SBP and DBP in non-diabetics as well as diabetics but SDNN was significantly less in diabetics as compared to non- diabetics during stress. Conclusion: Data from the study demonstrated that diabetics with 8-10 yrs history had already developed parasympathetic autonomic neuropathy. Time domain analysis of HRV during mental stress can be used as a valuable tool for early diagnosis of autonomic neuropathy to prevent further complications.