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Early signs of left ventricular dysfunction in adolescents with Type 1 diabetes mellitus: The importance of impaired circadian modulation of blood pressure and heart rate

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Abstract

Diabetic cardiomyopathy is a well-defined complication of diabetes that occurs in the absence of ischemic heart disease or hypertension. Moreover impaired circadian blood pressure (BP) variation has been associated with autonomic dysfunction. The aim of our study was to evaluate diurnal BP fluctuations and autonomic function and their association with left ventricular function in adolescents with Type 1 diabetes mellitus (T1 DM). In 48 normotensive, normoalbuminuric diabetic adolescents, with a mean (±SD) age of 17.3 (±4.1) yr and a mean (±SD) diabetes duration of 8.5 (±3.3) yr, 24-h ambulatory BP was recorded. Moreover 24-h heart rate (HR) monitoring was performed. Myocardial structural parameters were studied by echocardiogram. Left ventricular end-diastolic (EDDLV) and end-systolic diameters (ESDLV) were estimated and left ventricular mass index (LVMI) was calculated using the Devereux formula. The patients were divided into 2 groups according to the absence of decrease (non-dippers) or the decrease (dippers) of nocturnal diastolic BP (DBP). The non-dippers showed, in comparison with the dippers, reduced mean 24-h HR (79.6 vs 84.0 beats/min, p=0.05) and reduced mean day-time HR (81.3 vs 86.0 beats/min, p=0.05). The nondippers also presented greater ESDLV (28.7 vs 25.9 mm, p=0.001) and EDDLV (47.8 vs 45.1 mm, p=0.040), and LVMI (90.2 vs 78.3 g/m2, p=0.044), in comparison with the dippers. During stepwise multiple regression, the most important variables affecting LVMI were mean HR (day): (b=−0.40, p=0.001), high frequency domain variable of HR variability (b=0.38, p=0.016) and glycosylated hemoglobin (b=0.67, p=0.001). In conclusion, we found that a group of normotensive diabetic adolescents with impaired nocturnal BP reduction, also had autonomic dysfunction, together with impaired left ventricular function. These findings suggest that there is a close relationship between autonomic function and left ventricular remodeling in patients with T1DM, which may be attributed to altered diurnal BP profile, autonomic neuropathy and poor glycemic control.

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Authors and Affiliations

  1. Diabetic Clinic, Second Department of Pediatrics, University of Athens, “P&A Kyriakou” Children’s Hospital, Greece

    K. Karavanaki MD, I. Konstantopoulos, E. Tsouvalas & C. Karayianni

  2. Cardiology Department, 7th Hospital of National Security, Athens, Greece

    G. Kazianis

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  1. K. Karavanaki MD
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  2. G. Kazianis
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  3. I. Konstantopoulos
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Correspondence to K. Karavanaki MD.

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Karavanaki, K., Kazianis, G., Konstantopoulos, I. et al. Early signs of left ventricular dysfunction in adolescents with Type 1 diabetes mellitus: The importance of impaired circadian modulation of blood pressure and heart rate. J Endocrinol Invest 31, 289–296 (2008). https://doi.org/10.1007/BF03346360

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