Clinical correlates of painful diabetic neuropathy and relationship of neuropathic pain with sensorimotor and autonomic nerve function.
BACKGROUND
This study investigated the clinical correlates of painful diabetic polyneuropathy (PDPN) and the relationship of neuropathic pain with sensorimotor and autonomic nerve function.


METHODS
Seventy-eight diabetic patients with PDPN (PDPN(+)), 57 with non-painful diabetic polyneuropathy (DPN(+)), and 56 without diabetic polyneuropathy (DPN(-)) were prospectively studied. Autonomic neuropathy, neuropathic symptoms and signs, vibration perception threshold, and neuropathic pain were assessed using 4 cardiovascular tests, scoring systems for symptoms and signs (Michigan Diabetic Neuropathy Score, MDNS), Biothesiometer, and a numerical rating scale.


RESULTS
Compared to DPN(+), PDPN(+) patients displayed higher BMI (P=0.0043), waist circumference (P=0.0057), neuropathy symptom score (P<0.0001), MDNS (P<0.0001), and lower Valsalva ratio (P=0.037). In a multiple logistic regression analysis including PDPN as the dependent variable and age, sex, body mass index (BMI), abdominal obesity, diabetes type, diabetes duration, HbA1c, blood pressure, triglycerides, smoking, peripheral arterial disease, Valsalva ratio and MDNS as the independent variables, BMI (OR 1.22, P=0.0012) and MDNS (OR 1.27, P=0.0005) were significantly and independently associated with PDPN. In a multivariate regression analysis including as independent variables also sex, age, diabetes type, diabetes duration and Valsalva ratio, 24-h pain score was significantly related to neuropathy symptom score (P=0.0011), MDNS (P=0.0158), and 10g monofilament (P=0.018).


CONCLUSIONS
BMI and sensorimotor deficits were the main determinants of PDPN and, as a novel finding, neuropathic pain intensity was related to the degree of neuropathy deficits. Thus, some peculiarity exists in metabolic correlates of diabetic neuropathic pain compared to insensate neuropathy but painfulness can still coexist with insensitivity.
Spallone
Vincenza
V
Endocrinology, Department of Internal Medicine, Tor Vergata University, Rome, Italy. vispa@mclink.it
Morganti
Roberto
R
D'Amato
Cinzia
C
Cacciotti
Laura
L
Fedele
Tiziana
T
Maiello
Maria R
MR
Marfia
Girolama
G
D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001341:Autonomic Nervous System / Q000503:physiopathology*; D003929:Diabetic Neuropathies / Q000503:physiopathology*; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009437:Neuralgia / Q000503:physiopathology*; D010147:Pain Measurement; D011446:Prospective Studies