Temporal association of nitric oxide levels and airflow in asthma after whole lung allergen challenge

2003 ◽  
Vol 95 (1) ◽  
pp. 436-440 ◽  
Author(s):  
Sumita B. Khatri ◽  
Jeffrey Hammel ◽  
Mani S. Kavuru ◽  
Serpil C. Erzurum ◽  
Raed A. Dweik
Keyword(s):  
Nitric Oxide ◽  
Allergen Challenge ◽  
Temporal Association ◽  
Breath Hold ◽  
Peak Flows ◽  
Control Subjects ◽  
Asthma Exacerbations ◽  
Before And After ◽  
Healthy Control ◽  
And Control

Exhaled nitric oxide (NO) levels are high in asthmatic subjects and increase with exacerbations. We hypothesized that higher levels of NO observed during asthma exacerbations are due to increased synthesis of NO. Exhaled NO and peak flows were measured in 11 asthmatic and 9 healthy control subjects before and after experimental asthmatic response induced by whole lung allergen challenge. Baseline peak flows of asthmatics were significantly lower than controls and decreased significantly immediately after challenge ( P = 0.004). NO was measured by collecting exhaled breaths without breath hold (NO0) and after a 15-s breath hold (NO15). The rate of NO accumulation over time [parts/billion per second (ppb/s)] was calculated by ΔNO/Δ t = (NO15 - NO0)/15, where Δ denotes a change and t is time. The NO accumulation rates in asthmatic and control subjects were similar at baseline; however, NO accumulation at 24 h increased threefold from baseline in asthmatic compared with control subjects (asthmatic subjects, 0.6 ± 0.2 ppb/s; control subjects, 0.2 ± 0.1 ppb/s; P = 0.01). Our study suggests that increased NO during an asthma exacerbation is due to increased synthesis, perhaps by increased expression of NO synthases.

scholarly journals Microdialysis for chronic exertional compartment syndrome: a pilot study

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Heinz Lohrer ◽  
Jochen Klein ◽  
Tanja Nauck ◽  
Tobias Schönberg
Keyword(s):  
Pilot Study ◽  
Compartment Syndrome ◽  
Level Of Evidence ◽  
Chronic Exertional Compartment Syndrome ◽  
Control Subjects ◽  
Exertional Compartment Syndrome ◽  
Before And After ◽  
Healthy Control ◽  
Exercise Induced ◽  
And Control

Abstract Background Diagnosing chronic exertional compartment syndrome (CECS) is still a challenge. An increase in intramuscular pressure during and following exercise is accepted as the diagnostic standard. However, neither the methods used nor the interpretation of the obtained results are sufficiently standardized. Methods In the present pilot study, the metabolic state of CECS patients was investigated using microdialysis. We hypothesized that there was no difference in intramuscular concentrations of glucose, lactate, glutamate, and glycerol before and after exercise (H10) or between patients suffering from CECS and healthy control subjects (H20). This study was designed as an explorative case-control study (level of evidence III). Twelve patients suffering from CECS of the lower leg and six matched asymptomatic control subjects underwent microdialysis in the anterior (n = 7) or deep posterior compartment (n = 11) of the leg. Following ultrasound-guided insertion of the microdialysis catheters, 10-minute fractions of the dialysates were collected first during rest and then following fatigue- or pain-induced discontinuation of exercise. Dialysates were analysed for lactate, glucose, glutamate, and glycerol concentrations 6 × 10 min before and 6 × 10 min after exercise. Results Exercise-induced increases in lactate, glutamate, and glycerol concentrations were detected in both CECS patients and control subjects (all p < 0.001). No differences between CECS patients and control subjects were found by comparing the intramuscular glucose, lactate, glutamate, and glycerol concentrations at rest and following exercise (all p > 0.05). Conclusions We found exercise-induced increases in the lactate, glutamate, and glycerol levels in skeletal muscle. However, the metabolic changes did not differentiate CECS patients from healthy subjects. Trial registration The registration trial number is DRKS00021589 on DRKS. ‘Retrospectively registered’. Date of registration: April 4, 2020.

scholarly journals Microdialysis for Chronic Exertional Compartment Syndrome

2020 ◽  
Author(s):  
Heinz Lohrer ◽  
Jochen Klein ◽  
Tanja Nauck ◽  
Tobias Schönberg
Keyword(s):  
Compartment Syndrome ◽  
Level Of Evidence ◽  
Chronic Exertional Compartment Syndrome ◽  
Control Subjects ◽  
Exertional Compartment Syndrome ◽  
Before And After ◽  
Healthy Control ◽  
Exercise Induced ◽  
And Control ◽  
Control Study

Abstract Background: Diagnosing chronic exertional compartment syndrome (CECS) is still a challenge. An increase in intramuscular pressure during and following exercise is accepted as the diagnostic standard. However, neither the methods used nor the interpretation of the obtained results are sufficiently standardized. Methods: In the present study, the metabolic state of CECS patients was investigated using microdialysis. We hypothesized that there was no difference in intramuscular concentrations of glucose, lactate, glutamate, and glycerol before and after exercise (H10) or between patients suffering from CECS and healthy control subjects (H20). This study was designed as an explorative case-control study (level of evidence III). Twelve patients suffering from CECS of the lower leg and six matched asymptomatic control subjects underwent microdialysis in the anterior (n = 7) or deep posterior compartment (n = 11) of the leg. Following ultrasound-guided insertion of the microdialysis catheters, ten-minute fractions of the dialysates were collected first during rest and then following fatigue- or pain-induced discontinuation of exercise. Dialysates were analysed for lactate, glucose, glutamate, and glycerol concentrations 6 × 10 min before and 6 × 10 min after exercise. Results: Exercise-induced increases in lactate, glutamate, and glycerol concentrations were detected in both CECS patients and control subjects (all p < 0.001). No differences between CECS patients and control subjeccts were found by comparing the intramuscular glucose, lactate, glutamate, and glycerol concentrations at rest and following exercise (all p > 0.05). Conclusions: We found exercise-induced increases in the lactate, glutamate, and glycerol levels in skeletal muscle. However, the metabolic changes did not differentiate CECS patients from healthy subjects. Trial registration: The registration trial number is DRKS00021589 on DRKS. 'Retrospectively registered'. Date of registration: April 4, 2020

scholarly journals Evidence for altered hepatic matrix degradation in genetic haemochromatosis

Gut ◽  
1998 ◽  
Vol 42 (5) ◽  
pp. 715-720 ◽  
Author(s):  
D K George ◽  
G A Ramm ◽  
L W Powell ◽  
L M Fletcher ◽  
N I Walker ◽  
...  
Keyword(s):  
Iron Concentration ◽  
Serum Levels ◽  
Tissue Inhibitor Of Metalloproteinase ◽  
Hepatic Iron ◽  
Matrix Degradation ◽  
Control Subjects ◽  
Before And After ◽  
Healthy Control ◽  
And Control ◽  
Hepatic Iron Concentration

Background—Altered matrix degradation contributes to fibrosis in some liver diseases but the role of matrix degradation in fibrogenesis associated with genetic haemochromatosis has not previously been addressed.Aims—To measure serum concentrations of tissue inhibitor of metalloproteinase 1 (TIMP-1) and matrix metalloproteinases (MMP), MMP-1, MMP-2, and MMP-3 in patients with haemochromatosis and control subjects.Patients—Forty patients with haemochromatosis and 19 healthy control subjects. Ten of the 40 patients were studied before and after venesection therapy.Methods—Serum levels of TIMP-1, MMP-1, MMP-2, and MMP-3 were measured by enzyme immunoassay and correlated to hepatic iron concentration and degree of histological fibrosis.Results—Serum TIMP-1 was increased in patients with haemochromatosis compared with controls (163 (30) versus 123 (28) ng/ml, p<0.0002). Mean serum TIMP-1 concentration of patients with haemochromatosis without fibrosis was significantly higher than in controls (153 (16) versus 123 (28) ng/ml, p=0.03). Serum TIMP-1 concentration correlated with both hepatic iron concentration and hepatic iron index (r=0.42, p<0.01; r=0.42, p<0.01). Serum MMP-2 concentrations correlated with increasing degree of fibrosis in patients with haemochromatosis (r=0.38, p=0.01). The mean MMP-1:TIMP-1, MMP-2:TIMP-1 and age/sex matched MMP-3:TIMP-1 ratios were significantly lower in patients with haemochromatosis than controls (0.11 (0.06) versus 0.2 (0.14), p=0.02; 3.32 (0.9) versus 3.91 (0.81), p=0.05; and 0.26 (0.12) versus 0.47 (0.27), p=0.007, respectively). Following venesection, MMP-2 and MMP-3 concentrations increased by 11% (p=0.03) and 19% (p=0.03), respectively.Conclusions—This study provides the first evidence of an alteration in matrix degradation in haemochromatosis that may be a contributing factor to hepatic fibrogenesis in this disease.

SECRETION OF DIHYDROTESTOSTERONE BY HUMAN PROSTATE IN BENIGN PROSTATIC HYPERTROPHY

1974 ◽  
Vol 77 (2) ◽  
pp. 401-407 ◽  
Author(s):  
J. A. Mahoudeau ◽  
A. Delassalle ◽  
H. Bricaire
Keyword(s):  
Plasma Levels ◽  
Benign Prostatic Hypertrophy ◽  
Prostatic Hypertrophy ◽  
Human Prostate ◽  
Control Subjects ◽  
Peripheral Plasma ◽  
Significant Difference ◽  
Before And After ◽  
The Mean ◽  
And Control

ABSTRACT Plasma levels of testosterone (T) and 5α-dihydrotestosterone (DHT) were determined by radioimmunoassay in 29 patients with benign prostatic hypertrophy (BPH) and in 56 control men of various ages. No significant difference was found in T, DHT nor DHT/T ratio between BPH and control subjects of similar age. Plasma DHT was higher in the prostatic than in the peripheral veins in 8/9 patients with BPH during laparotomy, indicating a prostatic secretion of DHT. No difference in the mean T nor the mean DHT was found in peripheral plasma before and after adenomectomy.

scholarly journals Is Emotional Intelligence Impaired in Unaffected Siblings of Patients with Schizophrenia?

2017 ◽  
Vol 23 (7) ◽  
pp. 577-583 ◽  
Author(s):  
Beatrice Frajo-Apor ◽  
Georg Kemmler ◽  
Silvia Pardeller ◽  
Markus Huber ◽  
Christian Macina ◽  
...  
Keyword(s):  
Emotional Intelligence ◽  
Social Cognition ◽  
Social Cognitive ◽  
Mental Illnesses ◽  
Control Subjects ◽  
Brief Assessment ◽  
Performance Patterns ◽  
Healthy Control ◽  
Social Cognitive Deficits ◽  
And Control

AbstractObjectives:Social cognitive deficits have been discussed to be endophenotypes for schizophrenia and other serious mental illnesses. The current study aimed to assess emotional intelligence (EI) in unaffected siblings of schizophrenia patients to investigate its potential role as endophenotype for schizophrenia.Methods:EI was measured in 56 schizophrenia patients, 57 unaffected siblings, and 127 healthy control subjects by using the Mayer-Salovey-Caruso Emotional Intelligence Test (MSCEIT). In addition, non-social cognition was assessed with the Brief Assessment of Cognition in Schizophrenia (BACS). Linear mixed models with compound symmetric correlation structure were used for of the three groups with respect to EI and non-social cognition.Results:Schizophrenia patients showed significantly lower overall EI and performed significantly worse in three out of four MSCEIT branches compared to unaffected siblings and control subjects, whereas the two latter groups had comparable EI levels. Similar performance patterns (patients<unaffected siblings=control subjects) were found with respect to non-social cognition. Solely in the “Tower of London” test, siblings achieved significantly lower task scores compared to control subjects.Conclusions:Based on our results, EI as measured with the MSCEIT does not seem to represent a marker of risk for schizophrenia. Further investigations should concentrate on other EI measures to reassess this finding. (JINS, 2017,23, 577–583)

scholarly journals Serum levels of NG, NG-dimethyl-L-arginine, a potential endogenous nitric oxide inhibitor in dialysis patients.

1997 ◽  
Vol 8 (9) ◽  
pp. 1437-1442
Author(s):  
B Anderstam ◽  
K Katzarski ◽  
J Bergström
Keyword(s):  
Nitric Oxide ◽  
Blood Pressure ◽  
Serum Levels ◽  
Model Systems ◽  
Dialysis Dose ◽  
Control Subjects ◽  
Before And After ◽  
Endogenous Nitric Oxide ◽  
Experimental Model Systems ◽  
The One

Nitric oxide (NO) is involved in blood pressure regulation, and its synthesis is inhibited by methylarginines. It has been hypothesized that one of these, asymmetrical dimethylarginine (ADMA), may contribute to dialysis-associated hypertension because it accumulates in the plasma of hemodialysis (HD) patients in a concentration high enough (4 mumol/L) to inhibit NO synthesis in experimental model systems. A precolumn HPLC technique was used to quantify methylarginines (ADMA and symmetrical dimethylarginine [SDMA]) in plasma from HD patients before and after dialysis, from continuous ambulatory peritoneal dialysis (CAPD) patients, and from healthy subjects. Plasma ADMA concentrations were 0.59 +/- 0.22 (SD) mumol/L in HD patients predialysis (n = 19) and 0.70 +/- 0.27 mumol/L in CAPD patients (n = 11), versus about half of the concentration in control subjects (0.36 +/- 0.08 mumol/L, n = 7). The concentrations of SDMA (not an inhibitor of NO formation) were approximately four to five times the ADMA concentrations in both HD and CAPD patients, in contrast to a ratio of 1:1 in the control subjects. Methylarginine concentrations were reduced by 23% and 40% postdialysis, as calculated from ADMA and SDMA values, respectively. No significant correlations were observed between ADMA concentrations, on the one had, and blood pressure, creatinine and dialysis dose (Kt/V urea), on the other hand. It is concluded that plasma levels of ADMA are considerably lower than those reported earlier in patients treated with HD and also below the levels that hitherto have been thought to have clinical relevance. The role of ADMA in inhibiting NO in dialysis-associated hypertension is questioned.

scholarly journals Inhibition of TNF-αReverses the Pathological Resorption Pit Profile of Osteoclasts from Patients with Acute Charcot Osteoarthropathy

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Nina L. Petrova ◽  
Peter K. Petrov ◽  
Michael E. Edmonds ◽  
Catherine M. Shanahan
Keyword(s):  
Osteoclast Formation ◽  
Diabetic Patients ◽  
Blood Monocytes ◽  
Control Subjects ◽  
Osteoclastic Resorption ◽  
Healthy Control ◽  
Macrophage Colony ◽  
And Control ◽  
Charcot Osteoarthropathy

We hypothesised that tumour necrosis factor-α(TNF-α) may enhance receptor activator of nuclear factor-κβligand- (RANKL-) mediated osteoclastogenesis in acute Charcot osteoarthropathy. Peripheral blood monocytes were isolated from 10 acute Charcot patients, 8 diabetic patients, and 9 healthy control subjects and culturedin vitroon plastic and bone discs. Osteoclast formation and resorption were assessed after treatment with (1) macrophage-colony stimulating factor (M-CSF) and RANKL and (2) M-CSF, RANKL, and neutralising antibody to TNF-α(anti-TNF-α). Resorption was measured on the surface of bone discs by image analysis and under the surface using surface profilometry. Although osteoclast formation was similar in M-CSF + RANKL-treated cultures between the groups (p>0.05), there was a significant increase in the area of resorption on the surface (p<0.01) and under the surface (p<0.01) in Charcot patients compared with diabetic patients and control subjects. The addition of anti-TNF-αresulted in a significant reduction in the area of resorption on the surface (p<0.05) and under the surface (p<0.05) only in Charcot patients as well as a normalisation of the aberrant erosion profile. We conclude that TNF-αmodulates RANKL-mediated osteoclastic resorptionin vitroin patients with acute Charcot osteoarthropathy.

Facial Expression and Sex Recognition in Schizophrenia and Depression

2005 ◽  
Vol 50 (9) ◽  
pp. 525-533 ◽  
Author(s):  
Benoit Bediou ◽  
Pierre Krolak-Salmon ◽  
Mohamed Saoud ◽  
Marie-Anne Henaff ◽  
Michael Burt ◽  
...  
Keyword(s):  
Facial Expression ◽  
Facial Expression Recognition ◽  
Recognition Task ◽  
Expression Recognition ◽  
Sex Recognition ◽  
Control Subjects ◽  
Healthy Control ◽  
And Control ◽  
Expression Processing ◽  
Selective Impairment

Background: Impaired facial expression recognition in schizophrenia patients contributes to abnormal social functioning and may predict functional outcome in these patients. Facial expression processing involves individual neural networks that have been shown to malfunction in schizophrenia. Whether these patients have a selective deficit in facial expression recognition or a more global impairment in face processing remains controversial. Objective: To investigate whether patients with schizophrenia exhibit a selective impairment in facial emotional expression recognition, compared with patients with major depression and healthy control subjects. Methods: We studied performance in facial expression recognition and facial sex recognition paradigms, using original morphed faces, in a population with schizophrenia ( n = 29) and compared their scores with those of depression patients ( n = 20) and control subjects ( n = 20). Results: Schizophrenia patients achieved lower scores than both other groups in the expression recognition task, particularly in fear and disgust recognition. Sex recognition was unimpaired. Conclusion: Facial expression recognition is impaired in schizophrenia, whereas sex recognition is preserved, which highly suggests an abnormal processing of changeable facial features in this disease. A dysfunction of the top-down retrograde modulation coming from limbic and paralimbic structures on visual areas is hypothesized.

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