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Query: UMLS:C0011854 (type 1 diabetes)
 20,749 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Cardiac autonomic neuropathy is a common complication in insulin dependent diabetes mellitus. Nevertheless, little is known about when this impairment occurs during the time course of the disease. Analysis of blood pressure (BP) and heart rate (HR) variability could be used to detect early signs of autonomic alteration. To test this proposal, twelve sexually mature male Yucatan miniature pigs were equipped with an arterial catheter for telemetric BP analysis, and with a venous access. BP and HR were recorded together with respiratory movements while the animals were resting in a sling. After the first recording session performed when the pigs were 5 months old, streptozotocin (STZ) was used to induce diabetes in seven pigs, while the five others were controls. BP and HR were measured 3 and 6 months after the onset of diabetes and at a similar age in the controls. BP and HR oscillated at the respiratory range (0.19 Hz). Spectral analysis showed this respiratory component was the main determinant of the short-term variability of BP and HR. Atropine increased HR and BP and markedly diminished the respiratory sinus arrhythmia. Propranolol diminished HR and the respiratory peak of HR. A reduced respiratory oscillation of BP paralleled the diminution of the respiratory peak of HR. Baroreceptor-HR reflex was estimated using injections of phenylephrine and nitroprusside, and by cross-spectral analysis between BP and HR. Atropine shifted the curve to higher HR values, while propranolol reduced the level of the upper plateau. Atropine decreased both the coherence and gain of the cross-spectral analysis. STZ injection resulted in a type 1 diabetes. At 3 months, diabetic pigs exhibited low levels of BP and a reduced overall variability of HR and BP. Spectral analysis indicated the respiratory sinus arrhythmia was markedly reduced. In addition, the sensitivity of the baroreceptor-HR reflex was reduced. At a latter stage of diabetes these alterations were marked and the level of the resting HR was increased. These data demonstrate the dual (vagal and sympathetic) control of HR in pigs and the dominant role of respiration in the genesis of HR and BP fluctuations. The spectral and cross-spectral analysis of BP and HR were altered after 3 months of diabetes and could be proposed as early detectors of cardiac autonomic neuropathy.
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PMID:Early detection of cardiovascular autonomic neuropathy in diabetic pigs using blood pressure and heart rate variability. 1094 77

Non-Obese Diabetic (NOD) mice show profound pathomorphological changes in sympathetic ganglia during the development of type 1 diabetes mellitus. We tested the hypothesis that NOD mice represent an experimental model to investigate cardiovascular changes seen in humans with diabetic autonomic neuropathy. Blood glucose (BG) levels were measured once a week. Diabetes mellitus was diagnosed as BG levels exceeded 250 mg/dl twice. NOD mice that did not become diabetic served as control group. Blood pressure (BP) and heart rate (HR) were monitored by telemetry and baroreflex sensitivity (BRS) was calculated with the sequence method or with cross spectral analysis. The measurements were obtained before onset of diabetes and during the 4th week of diabetes. The onset of diabetes was accompanied by a continuous decline in HR (615+/-14 vs. 498+/-23 bpm), whereas BP values remained stable (108+/-2 vs. 111+/-2 mm Hg). The circadian HR rhythm increased in diabetic NOD mice. BRS was higher in diabetic NOD mice than in controls. Atropine reduced BRS more profoundly in diabetic mice compared to non-diabetic mice. Despite pathomorphological similarities of the diabetic autonomic neuropathy between patients with diabetes and diabetic NOD mice, the changes in blood pressure regulation are different. In conclusion the use of diabetic NOD mice as a functional model for human diabetes may be questioned.
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PMID:Cardiovascular autonomic regulation in Non-Obese Diabetic (NOD) mice. 1816 3