Biomedical subjects

Arnulfo Nava

Publications and source records attributed to Arnulfo Nava.

5 recordsLinked to original sources

PubMed2006

Sphygmomanometry-evoked allodynia--a simple bedside test indicative of fibromyalgia: a multicenter developmental study.

BACKGROUND: One of the 2 classification criteria for fibromyalgia (FM) is the presence of tender points on specific anatomic sites. It has been established that these tender points reflect a state of generalized allodynia (defined as pain resulting from a stimulus that does not normally provoke pain). Patients with FM often describe pain elicitation during blood pressure testing (sphygmomanometry). OBJECTIVE: The objective of this study was to define if a universally used clinical test, sphygmomanometry, is helpful in the identification of patients with FM. METHODS: The authors conducted a prospective multicenter study in 3 different public rheumatology outpatient services. Each center studied 20 patients with FM, 20 with rheumatoid arthritis, 20 with osteoarthritis, and 20 healthy individuals. The following question was asked of each participant: "When I take your blood pressure, tell me if the cuff's pressure brings forth pain." The blood pressure cuff was inflated at an approximate rate of 10 mm Hg per second up to 180 mm Hg or to the point when pain was elicited. RESULTS: Sixty-nine percent of patients with FM had sphygmomanometry-evoked allodynia in contrast to 10% of patients with osteoarthritis, 5% with rheumatoid arthritis, and 2% of healthy individuals (P < 0.001). The mean blood pressure value at which allodynia was elicited was lower in patients with FM (143 +/- 40 mm Hg) when compared with the other 3 groups (176 +/- 11 mm Hg) or higher (P < 0.001). In patients with FM, there was a significant negative correlation between the blood pressure value at which allodynia developed and total Fibromyalgia Impact Questionnaire (FIQ) score, number of tender points, and the FIQ visual analog scales for pain intensity and fatigue (P < 0.05). The test yields a diagnostic sensitivity for FM of 0.7, specificity 0.96, positive predictive value 0.86, and negative predictive value 0.91. CONCLUSIONS: In this developmental study of patients attending rheumatology clinics, the generation of pain during blood pressure testing was strongly associated with the diagnosis of FM. This robust linkage probably reflects a tautologic phenomenon. A sine qua nonelement for FM diagnosis is the presence of tender points in discrete anatomic sites. These tender points in turn reflect a state of generalized mechanical allodynia that can be locally elicited by the cuff pressure during blood pressure testing. Sphygmomanometry is a simple bedside test that may be useful in the recognition of patients with FM. Blood pressure testing is a universal procedure in all clinical environments. Based on our results, we suggest searching for FM features in any person who has sphygmomanometry-evoked allodynia.

Adult↗

PubMed2003

Use of the leeds assessment of neuropathic symptoms and signs questionnaire in patients with fibromyalgia.

OBJECTIVE: Neuropathic pain syndrome is characterized by chronic, stimulus-independent pain sensation accompanied by hyperalgesia/allodynia and paresthesia. Fibromyalgia (FM) syndrome displays such features. The Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) Pain Scale is an instrument developed and validated to recognize neuropathic pain and set it apart from nociceptive pain. METHODS: This study assessed the responses of patients with FM versus patients with rheumatoid arthritis (RA) to the LANSS Pain Scale questionnaire. Twenty patients with FM and 20 patients with RA answered the Fibromyalgia Impact Questionnaire and LANSS Pain Scale questions related to the following neuropathic sensory disturbance domains: dysesthetic, autonomic, evoked, paroxysmal, and thermal. RESULTS: Pain severity was similar in both groups according to visual analog scale values (5.3 +/- 3.0 for FM v 5.4 +/- 3.1 for RA). There were sharp differences between FM and RA groups in the percentage of affirmative responses to 4 of 5 sensory disturbance questions: dysesthetic (95 v 30), evoked (95 v 35), paroxysmal (90 v 15), and thermal (90 v 20); P <.0001 for each comparison. CONCLUSIONS: The high prevalence of associated sensory disturbances supports the notion that FM is a neuropathic pain syndrome. CLINICAL RELEVANCE: The LANSS Pain Scale items may become a useful, easily applied bedside test to differentiate FM pain from the nociceptive pain present in RA and in similar arthritic illnesses.

Adult↗

PubMed2002

Norepinephrine-evoked pain in fibromyalgia. A randomized pilot study [ISRCTN70707830].

BACKGROUND: Fibromyalgia syndrome displays sympathetically maintained pain features such as frequent post-traumatic onset and stimuli-independent pain accompanied by allodynia and paresthesias. Heart rate variability studies showed that fibromyalgia patients have changes consistent with ongoing sympathetic hyperactivity. Norepinephrine-evoked pain test is used to assess sympathetically maintained pain syndromes. Our objective was to define if fibromyalgia patients have norepinephrine-evoked pain. METHODS: Prospective double blind controlled study. PARTICIPANTS: Twenty FM patients, and two age/sex matched control groups; 20 rheumatoid arthritis patients and 20 healthy controls. Ten micrograms of norepinephrine diluted in 0.1 ml of saline solution were injected in a forearm. The contrasting substance, 0.1 ml of saline solution alone, was injected in the opposite forearm. Maximum local pain elicited during the 5 minutes post-injection was graded on a visual analog scale (VAS). Norepinephrine-evoked pain was diagnosed when norepinephrine injection induced greater pain than placebo injection. Intensity of norepinephrine-evoked pain was calculated as the difference between norepinephrine minus placebo-induced VAS scores. RESULTS: Norepinephrine-evoked pain was seen in 80 % of FM patients (95% confidence intervals 56.3 - 94.3%), in 30 % of rheumatoid arthritis patients and in 30 % of healthy controls (95% confidence intervals 11.9 - 54.3) (p < 0.05). Intensity of norepinephrine-evoked pain was greater in FM patients (mean +/- SD 2.5 +/- 2.5) when compared to rheumatoid arthritis patients (0.3 +/- 0.7), and healthy controls (0.3 +/- 0.8) p < 0.0001. CONCLUSIONS: Fibromyalgia patients have norepinephrine-evoked pain. This finding supports the hypothesis that fibromyalgia may be a sympathetically maintained pain syndrome.

Journal Article↗

PubMedDate not supplied

[Atherosclerosis and inflammation].

Atherosclerosis is a disease of the large arteries. There are several risk factors, mainly genetic and environmental, associated with atherosclerosis. Recently acquired knowledge has clearly shown that a prominent role is played by several inflammatory mechanisms in the pathogenesis of this disease. Several pro-inflammatory molecules such as LDL, macrophage colony stimulating factor, and adhesion molecules, deserve special mention because of their major role in the inflammatory response that takes place in atherosclerosis.

Arteriosclerosis↗

PubMedDate not supplied

Circadian variation of cyclosporine A in renal transplanted patients.

BACKGROUND: A problem with the clinical use of cyclosporine A is the wide patient-to-patient variability in blood levels. OBJECTIVE: To evaluate the circadian variation in patients with renal transplant on twice daily dosing in order to evaluate if patients could need a dosage adjustment in diurnal or nocturnal dose. MATERIAL AND METHODS: The circadian variation of oral cyclosporine pharmacokinetics at steady state was evaluated in 20 patients with renal transplant. Drug doses were administered daily at 8 am and at 8 pm and blood samples for cyclosporine levels measurement by radioimmunoassay were taken during the morning treatment and the evening treatment. RESULTS: Differences were found in the minimum steady state concentration between the morning and the evening administration, however no statistical differences were obtained in peak steady state concentration (Cmaxss), time to peak concentration (tmaxss), area under the curve at steady state (AUCss), mean residence time (MRT) and total clearance (Clt/F). CONCLUSIONS: Therapeutic drug monitoring of cyclosporine A is more important than the time administration.

Administration, Oral↗