scholarly journals Embolism to the main limb arteries in patients with atrial fibrillation

2022 ◽  
Vol 20 (4) ◽  
pp. 14-20
Author(s):  
M. V. Mel’nikov ◽  
A. V. Sotnikov ◽  
D. S. Kozhevnikov ◽  
M. V. Solov’yeva ◽  
S. A . Boldueva
Keyword(s):  
Atrial Fibrillation ◽  
Limb Ischemia ◽  
Limb Amputation ◽  
Acute Ischemia ◽  
Acute Limb Ischemia ◽  
Surgical Department ◽  
The Past ◽  
Group 3 ◽  
Group 1

Introduction. Acute limb ischemia due to embolism in patients with atrial fibrillation remains poorly studied. Objective – to study the clinical significance and role of atrial fibrillation (AF) in the development of embolism to the bifurcation of the aorta and the main arteries of the limbs. Materials and methods. Treatment results of 1816 patients with acute ischemia of the extremities due to embolism treated at a specialized vascular surgical department for the past 30 years were analyzed. 1611 (88.7 %) of them had AF. The distribution into studied groups was according to the period time factor. Group 1 (n = 744) consisted of patients admitted in the period from 1991 to 2000; in group 2 (n = 568) – admitted in the period from 2001 to 2010, in group 3 (n = 299) – from 2011 to 2020. Methods included clinical examination, electrocardiography, Doppler-ultrasound, echocardiography. Results. The role of rheumatic heart disease as a cause of AF has decreased over the past decades by almost 10 times (from 19.5 % in group 1 to 2.0 % in group 3). Currently, the main background diseases for the development of AF are arterial hypertension and various forms of coronary artery disease. Embolism in patients with AF may develop in the arteries of all vascular areas of the systemic circulation, but in the practice of a vascular surgeon more often in the main arteries of minor caliber – the brachial (24.5 %) and popliteal (13.0 %). Multiple embolisms to various vascular areas were found in 2.8 % of patients. Urgent surgical revascularization of the limb by open embolectomy was performed in 1481 (91.9 %) patients that allowed 1348 (83.7 %) to be discharged with limb-sparing. Conclusion. In patients with acute limb ischemia of embologenic ethiology, comorbid AF has 88.7 % of them. Urgent embolectomy allows 83.7 % of patients to be discharged without limb amputation. Hospital mortality in the period 1991–2000 was 15.6 %, the last decade has been reduced to 7.4 %.

scholarly journals CHARACTERISTICS OF PURULONECROTIC LESIONS IN COVID-19 PATIENTS

2021 ◽  
pp. 19-26
Author(s):  
A.N. Belyaev ◽  
I.S. Pol'kina
Keyword(s):  
Social Life ◽  
Inflammatory Diseases ◽  
Lower Extremities ◽  
Limb Ischemia ◽  
Lower Limbs ◽  
Limb Amputation ◽  
Acute Limb Ischemia ◽  
Arterial Embolism ◽  
Group 2 ◽  
Group 1

The COVID-19 pandemic has changed not only our social life, but also the course of many diseases, including purulent-inflammatory diseases of the lower extremities. The aim of the paper is to assess the influence of COVID-19 on purulonecrotic lesions of the lower extremities. Materials and Methods. We analyzed the results of treatment of 65 patients with purulonecrotic lesions of the lower extremities. All the patients were divided into 2 groups: Group 1 – 32 Non-COVID-19 patients, Group 2 – 33 COVID-19 patients. We studied laboratory blood parameters, hemostatic systems, performed lungs computed tomography (CT), and color-coded duplex scanning (CDS) of veins. Results. COVID-19 is more likely to affect patients aged 60–69 (51.5 %) and females (66.7 %). In Group 2 the level of leukocytes was higher than in Group 1 (11.2×109 and 13.9 109, respectively, p<0.05). Patients in both groups showed a tendency to hypercoagulability during anticoagulant therapy. In Group 2 patients, the percentage of transfemoral amputations was higher than in Group 1 patients (58 % and 18.8 % respectively). Arterial embolism of the lower limbs in Group 2 was observed in 6 % of patients. There were no deaths in Group 1, but in Group 2 mortality rate was 33.3 %. Conclusion. COVID-19 increases the number of arterial and venous thrombosis, often complicated by acute limb ischemia. Ischemic purulonecrotic processes complicated by COVID-19 are more severe, often lead to major limb amputation and are an important aggravating factor leading to death. Key words: COVID-19, purulonecrotic complications, coagulation, amputation. Пандемия COVID-19 не только внесла коррективы в социальную жизнь, но и изменила течение многих заболеваний, в т.ч. и гнойно-воспалительных поражений нижних конечностей. Цель. Оценить влияние коронавирусной инфекции на течение гнойно-некротических поражений нижних конечностей. Материалы и методы. Проведен анализ результатов лечения 65 больных с гнойно-некротическими поражениями нижних конечностей. Пациенты были разделены на 2 группы: 1-я группа – 32 больных без COVID-19, 2-я группа – 33 больных с COVID-19. Исследовались лабораторные показатели крови, системы гемостаза, проводились компьютерная томография легких, цветное дуплексное сканирование вен, анализировались результаты лечения. Результаты. COVID-19 чаще поражаются пациенты в возрасте 60–69 лет (51,5 %) и лица женского пола (66,7 %). У больных 2-й группы уровень лейкоцитов был выше, чем в 1-й группе (11,2×109/л и 13,9 ×109/л соответственно, р<0,05). На фоне антикоагулянтной терапии у больных обеих групп отмечалась тенденция к гиперкоагуляции. У больных 2-й группы ампутации на уровне бедра достигли 58 %, что более чем в 2 раза больше, чем у больных 1-й группы (18,8 %). Тромбоэмболии артерий конечностей во 2-й группе составили 6 %. Летальности в первой группе не было, во 2-й группе – 33,3 %. Выводы. Коронавирусная инфекция способствует возрастанию количества артериальных и венозных тромбозов, нередко осложняющихся острой ишемией конечностей. Ишемические гнойно-некротические процессы на фоне COVID-19 имеют более тяжелое течение, часто приводят к высокой ампутации конечности и являются важным отягощающим фактором, приводящим к летальному исходу. Ключевые слова: COVID-19, гнойно-некротические осложнения, коагуляция, ампутация.

scholarly journals Factors That Determine the Prothrombin Time in Patients With Atrial Fibrillation Receiving Rivaroxaban

2018 ◽  
Vol 24 (9_suppl) ◽  
pp. 188S-193S
Author(s):  
Jen-Hung Huang ◽  
Yung-Kuo Lin ◽  
Cheng-Chih Chung ◽  
Ming-Hsiung Hsieh ◽  
Wan-Chun Chiu ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Prothrombin Time ◽  
Factor Xa ◽  
International Normalized Ratio ◽  
Biochemical Properties ◽  
Study Patient ◽  
Group 3 ◽  
Multiple Variables ◽  
Group 2 ◽  
Group 1

Rivaroxaban, a direct factor Xa inhibitor, is widely used to reduce the chance of stroke in patients with atrial fibrillation (AF). It is not clear why the prothrombin time (PT) of the international normalized ratio (INR) fails to correlate with treatment using rivaroxaban in patients with AF. In this study, patient characteristics, the rivaroxaban dosage, AF type, drug history, biochemical properties, and hematological profiles were assessed in patients treated with rivaroxaban. In 69 patients with AF receiving rivaroxaban, 27 (39.1%) patients had a normal INR (≤1.1, group 1), 27 (39.1%) patients had a slightly prolonged INR (1.1∼1.5, group 2), and 15 (21.7%) patients had a significantly prolonged INR (>1.5, group 3). Group 1 patients had a higher incidence of a stroke history than did patients in group 2 ( P = .026) and group 3 ( P = .032). We scored patients with a persistent AF pattern (1 point), paroxysmal AF pattern (0 point), renal function (ie, the creatinine clearance rate in mL/min/1.73 m2 of >60 as 0 points, of 30∼60 as 1 point, and of <30 as 2 points), and no history of stroke (1 point), and we found that group 3 had a higher score than groups 2 or 1 (2.9 ± 0.8, 2.4 ± 0.7, and 2 ± 0.7, respectively; P < .05). There were similar incidences of bleeding, stroke, and unexpected hospitalizations among the 3 groups. The PT of the INR is determined by multiple variables in patients with AF receiving rivaroxaban. Rivaroxaban-treated patients with AF having different INR values may have similar clinical outcomes.

scholarly journals Atrial Fibrillation is Associated with Femoropopliteal Totally Occlusive In-Stent Restenosis: A Single-Center, Retrospective, Observational Study

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Yohsuke Honda ◽  
Keisuke Hirano ◽  
Masahiro Yamawaki ◽  
Motoharu Araki ◽  
Norihiro Kobayashi ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Cox Regression ◽  
De Novo ◽  
Limb Ischemia ◽  
Hazard Ratio ◽  
Acute Limb Ischemia ◽  
Stent Occlusion ◽  
Stent Restenosis ◽  
Artery Disease ◽  
In Stent Restenosis

Introduction. The proportion of patients with comorbid atrial fibrillation (AF) and peripheral artery disease (PAD) has increased in this era. This study aimed to assess the relationship between AF and totally occlusive in-stent restenosis (ISR) in femoropopliteal (FP) lesions. Methods. In this study, 363 patients (461 stents) who underwent endovascular therapy with de novo stent implantation in our hospital between April 2007 and December 2016 were retrospectively evaluated. The patients were divided into two groups according to the AF status (AF group, 61 patients; sinus group, 302 patients). The primary endpoint was the incidence of totally occlusive ISR within 3 years. The secondary endpoint was the incidence of acute limb ischemia (ALI) due to FP stent occlusion. Results. Baseline characteristics were similar, except for higher age and a lower prevalence of dyslipidemia in the AF group. The incidence of a totally occlusive ISR was higher in the AF group than in the sinus group (29.5% vs. 14.6%, p = 0.004 ). A multiple Cox regression model suggested that presence of AF (hazard ratio, 2.10) and CTO lesion (hazard ratio, 1.97) which were the independent predictors of a totally occlusive ISR within 3 years. The incidence of ALI was significantly higher in the AF group than in the sinus group (3.9% vs. 0%, p = 0.0001 ). In the AF group, the introduction of an anticoagulant did not prevent the occurrence of totally occlusive ISR ( p = 0.71 ) for ALI ( p = 0.79 ). Conclusions. AF is independently associated with totally occlusive ISR of FP stents; however, anticoagulant use does not prevent stent occlusion.

scholarly journals How is juvenile rheumatic heart disease different: baseline results from a prospective north Indian registry

2020 ◽  
Vol 41 (Supplement_2) ◽  
Author(s):  
K Mahajan ◽  
D.R Prakash Chand Negi
Keyword(s):  
Heart Failure ◽  
Atrial Fibrillation ◽  
Pulmonary Hypertension ◽  
Heart Disease ◽  
Funding Source ◽  
Thromboembolic Events ◽  
Group 3 ◽  
Group 2 ◽  
Rheumatic Heart ◽  
Group 1

Abstract Introduction Juvenile rheumatic heart disease (RHD) refers to RHD in patients &lt;20 years of age. There are no contemporary data highlighting the differences between juvenile and older RHD patients. Purpose We aim to report the age related differences in the pattern, and consequencies of valvular dysfunction in patients of RHD. Methods The 2475 consecutive patients of RHD diagnosed using clinical and echocardiographic criteria were registered prospectively from 2011 till December 2019. Patients were divided into 3 groups according to their age: Group 1 (Juvenile RHD), Group 2 (21–50 years), and Group 2 (&gt;51 years).The data concerning the socio-demographic and clinical profile were recorded systematically, and the nature and severity of valvular dysfunction was assessed by echocardiography. The data were analyzed using the Epi-InfoTM Software. Results Out of 2475 RHD patients, Juvenile RHD comprised of 211 (8.5%) patients. Group 2 and 3 comprised of 1691 (68.3%) and 573 (23.2%) patients respectively. Overall, 1767 (71.4%) patients were females, however this female predilection was less pronounced in juvenile RHD (55.5% females vs 44.5% males) as compared to older groups. Past history of acute rheumatic fever was more commonly recorded in Juvenile RHD group (37.9% vs 18.8% in group 2 and 10% in group 3, p=0.0001). At the time of registration, the presence of advanced heart failure symptoms (dyspnea class III and IV) (11.4% group 1 vs 13.9% group 2 vs 20.6% group 3, p&lt;0.0001), right heart failure symptoms (0.9% group 1 vs 2.5% group 2 vs 7.3% group 3, p&lt;0.01), thromboembolic events (0% group 1 vs 4.1% group 2 vs 3.3% group 3, p&lt;0.01), atrial fibrillation (2.8% group 1 vs 24.5% group 2 vs 45.9% group 3, p&lt;0.0001), and pulmonary hypertension (27.1% group 1 vs 40.3% group 2 vs 51.9% group 3, p&lt;0.01), were all more commonly recorded in non-juvenile older RHD groups. Multivalvular involvement was also less common in juvenile RHD (34.6% vs 42.4% and 44.5%, p=0.04). Mitral regurgitation was the most common lesion in Juvenile RHD followed by aortic regurgitation (68.7% and 40.2% respectively). Stenotic lesions (both mitral and aortic) were present more commonly in older age groups. Conclusion RHD is predominantly a disease of females, however the predilection is less common in juvenile patients. Juvenile RHD predominantly affects the mitral valve and mainly leads to regurgitant lesions. As the age advances, the complications of RHD, mainly heart failure symptoms, thromboembolic events, pulmonary hypertension, and atrial fibrillation, become more common. Funding Acknowledgement Type of funding source: Public hospital(s). Main funding source(s): Self sponsored registry

Abstract 15948: Impact of Age on Safety of Radiofrequency Ablation in Patients With Atrial Fibrillation

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Janet W Elcano ◽  
Hui Nam Pak
Keyword(s):  
Atrial Fibrillation ◽  
Phrenic Nerve Palsy ◽  
Adjusted Risk ◽  
Ablation Time ◽  
Group 4 ◽  
Major Complications ◽  
Group 3 ◽  
Group 2 ◽  
The Impact ◽  
Group 1

Background: The incidence of atrial fibrillation (AF) is increasing in the elderly population, however, there is paucity of data on the safety outcomes of this patient subgroup thus we sought to investigate on the impact of age on the safety of catheter ablation for AF. Methods and Results: We included 1,293 (male 75%) patients enrolled in Yonsei AF Ablation Cohort database in Seoul, South Korea, from March 2009 to November 2013. We divided the patients into 4 groups according to age (Group 1, aged 17-49, N=295 ; Group 2 50-59, N=421; Group 3 60-69 N=408; and Group 4 ≥ 70, N=169) and evaluated the incidence of procedure related complications. No procedure-related death occurred in this study. There was a trend of increasing incidence of procedure related complications with age noted as follows: Group 1= 3.7%; Group 2= 4.0%; Group 3=6.6%; and Group 4 7.1%, (p= 0.15). There were 28 cases (2.2%) of major complications (Group 1=1.7%, Group 2=1.9%, Group 3=2%, Group 4 4.1%), tamponade being the most common. Major complications in group 4 include: tamponade 4 cases, phrenic nerve palsy 1 case, atrioesophaeal fistula 1 and 3rd degree AV block in 1 patient. Multivariate regression analysis shows ablation time (odds ratio (OR) 1.2 confidence interval (CI)1.0-1.017, p=0.017), procedure time (OR 1.008, CI 1.0-1.15, p=0.04), decreasing eGFR (OR 1.013, CI 1.002-1.026 p=0.018), coronary artery disease (CAD) (OR 1.847, CI 1.003-3.524, p0.04) and age (OR 1.028, CI 1.003-1.055, p=0.03) were associated with increased adjusted risk of total complications. Predictors of major complications include age (OR 1.044, CI 1.003-1.086, p0.02) and ablation time (OR 1.009, CI 0.999-1.000, p=0.033). Conclusion: Our data suggest that incidence of procedural complications in RFA of AF increase with age. Ablation time and age are independent predictors of a major complication.

REACTIONS OF DRUG-DEPENDENT ANTIBODIES WITH METABOLITES OF QUININE (Qn) AND QUINIDINE (Qd)

1987 ◽  
Author(s):  
D J Christie ◽  
H Diaz-Arauzo ◽  
J M Cook
Keyword(s):  
Ring Structure ◽  
Quinoline Ring ◽  
Drug Induced ◽  
Group 3 ◽  
Methyl Derivatives ◽  
Drug Dependent ◽  
Group 2 ◽  
Asymmetric Carbon ◽  
Group 1

In many cases of drug-induced immunologic thrombocytopenia (DITP), a metabolite, rather than the native drug, is suspected of provoking the destructive drug-dependent antibodies (DDAB) responsible for this severe hemorrhagic disorder. However, this has not previously been investigated for Qn- and Qd-DDAB. We report evidence that the native drugs, and not their metabolites, are the provocative agents in Qn and Qd DITP. Reactions of Qn- and Qd-DDAB with platelets were studied with the native drugs and four of their metabolites: the N-oxide and 10,11-diol derivatives (quinuclidine ring modifications), the des-methyl derivatives (aromatic quinoline ring modification), and 2'-quininone and 2'-quinidinone (2'-oxo derivatives) (also quinoline ring modifications on Qn and Qd, respectively). Five antibodies were studied:two Group 1 DDAB (specific for compounds with native configuration at asymmetric carbon positions), two Group 2 DDAB (similar to Group 1 DDAB but also known to require the methoxy group on the quinuclidine ring for full activity), and one Group 3 DDAB (reactive with the native drug, its stereoisomer, and several nonmetabolic analogs of both compounds) . Using a complement-dependent 51Cr-lysis assay, the reactions of all DDAB with platelets and the four metabolites were similar to 100-fold weaker when compared to reactions obtained with the native drug, with these exceptions:Group 2 DDAB failed to react with the desmethyl and 2'-oxo metabolites and the Group 3 DDAB failed to react with 2'-oxo Qd. This observation shows that the activity of certain DDAB is critically dependent on the native quinoline ring structure. Importantly, none of the DDAB reacted more strongly with any of the metabolites tested when compared with reactions in the presence of the native drug. These findings indicate that DDAB react with platelets preferentially in the presence of the unaltered Qn and Qd molecules and suggest that, while the role of metabolites cannot be entirely ruled out, the native structure of the drug molecule is sufficient to stimulate production of the antibodies responsible for DITP.

P5392Epicardium derived cells promote sympathetic ganglionic outgrowth towards myocardium in vitro

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
Y Ge ◽  
A M Smits ◽  
J C Van Munsteren ◽  
T Van Herwaarden ◽  
A M D Vegh ◽  
...  
Keyword(s):  
Neurite Outgrowth ◽  
Autonomic Innervation ◽  
Cardiac Damage ◽  
Group 4 ◽  
Group 3 ◽  
Cervical Ganglia ◽  
Group 2 ◽  
Group 1

Abstract Background The autonomic nerve system is essential to maintain homeostasis in the body. In the heart, autonomic innervation is important for adjusting the physiology to the continuously changing demands such as stress responses. After cardiac damage, excessive neurite outgrowth, referred to as autonomic hyperinnervation, can occur which is related to ventricular arrhythmias and sudden cardiac death. The cellular basis for this hyperinnervation is as yet unresolved. Here we hypothesize a role for epicardium derived cells (EPDCs) in stimulating sympathetic neurite outgrowth. Purpose To investigate the potential role of adult EPDCs in promoting sympathetic ganglionic outgrowth towards adult myocardium. Method Fetal murine superior cervical ganglia were dissected and co-cultured with activated adult mesenchymal epicardium-derived cells (EPDCs) or/and adult myocardium in a 3D collagen gel culture system. Four experiment groups were included: Group 1: Vehicle cultures (ganglia cultured without EPDC/myocardium) (n=48); Group 2: ganglia co-cultured with EPDCs (n=38); Group 3: ganglia co-cultured with myocardium (n=95); and group 4: ganglia co-cultured with both EPDCs and myocardium (n=96). The occurrence of neurite outgrowth was assessed in each group. The density of neurites that showed directional sprouting (i.e. sprouting towards myocardium) was assessed as well with a semi-automatic quantification method. Finally, sub-analyses were made by taking gender into account. Results Cervical ganglia cultured with EPDCs alone (group 2) showed increased neurite outgrowth compared to vehicle cultures (group 1), however the neurites did not show directional sprouting towards EPDCs. When co-cultured with myocardium (group 3), directional neurite outgrowth towards myocardium was observed. Compared to the ganglia-myocardium co-cultures, directional outgrowth was significantly increased in co-cultures combining myocardium and EPDCs (group 4), and the neurite density was also significantly augmented. Comparison between males and female ganglia demonstrated that more neurite outgrowth occurred in female-derived ganglia than in male-derived ganglia under the same co-culture conditions. Conclusion Activated adult EPDCs promote sympathetic ganglionic outgrowth in vitro. Sex differences exist in the response of ganglia to EPDCs, and female-derived ganglia appear more sensitive to EPDC-signalling. Results support a role of EPDCs in cardiac autonomic innervation and open avenues for exploring of their role in ventricular hyperinnervation after cardiac damage.

P4766Edoxaban Treatment in routiNe clinical prActice for patients with atrial fibrillation (AF) in Europe (ETNA-AF-Europe): 1-year follow-up according to body mass index

2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
T Weiss ◽  
R De Caterina ◽  
P Kelly ◽  
P Monteiro ◽  
J C Deharo ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Body Weight ◽  
Oral Anticoagulants ◽  
Anticoagulation Therapy ◽  
Normal Weight ◽  
Routine Practice ◽  
Group 3 ◽  
Group 2 ◽  
Group 1

Abstract Background Non-vitamin K antagonist (VKA) oral anticoagulants (NOACs) have substantially improved anticoagulation therapy for prevention of stroke and systemic embolism in patients with atrial fibrillation (AF), and available routine care data have so far broadly confirmed the safety of different NOACs in routine practice. However, such data for edoxaban are scarce, especially in extremely low and high body weight (BW). These extreme BWs may affect the bioavailability, distribution, and half-life of NOACs and, consequently, outcomes of treatment. Methods We analysed outcomes in normal-weight (BMI 18.5–25) vs overweight (BMI 25–30) and obese (BMI >30) patients enrolled into the ETNA-AF-Europe observational study (NCT02944019) collecting information on patients treated with edoxaban in 825 sites in 10 European countries. This snapshot analysis set includes data of 7,672 patients (56.3% of all enrolled patients) which have completed their 1-year follow-up visit (mean follow-up: 343.5 days). Results Median patient age was 74 years for all patients, 76 years for patients with a BMI 18.5–25 (group 1), 75 years for patients with BMI 25–30 (group 2), and 72 for patients with a BMI >30 (group 3). CrCl was 64 mL/min for patients with a BMI 18.5–25, 68 mL/min for patients with BMI 25–30, and 72 mL/min for patients with a BMI >30. The CHA2DS2-VASc (mean 3.1±1.38) and HAS-BLED (mean 2.5±1.10) score did not differ significantly between groups. As expected, diabetes and hypertension were significantly less prevalent in leaner patients and - accordingly - inversely correlated to age. There was no correlation between body weight and life-threatening bleeding (group 1: 0.28%; group 2: 0.40%; group 3: 0.14%). Also, stroke rates (group 1: 0.74%; group 2: 0.81%; group 3: 0.76%) did not differ between groups. Conclusion BMI, within the range here assessed, does not affect 1-year outcomes in European AF patients treated with edoxaban. Acknowledgement/Funding Daiichi Sankyo Europe GmbH, Munich, Germany

scholarly journals Odour-Evoked Memory in Dogs: Do Odours Help to Retrieve Memories of Food Location?

Animals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1249
Author(s):  
Angelo Quaranta ◽  
Serenella d’Ingeo ◽  
Marcello Siniscalchi
Keyword(s):  
Learning Task ◽  
Spatial Task ◽  
Spatial Memories ◽  
Group 3 ◽  
Group 2 ◽  
Odor Group ◽  
With Memory ◽  
Specific Odor ◽  
Group 1

The ability of odors to spontaneously trigger specific memories has been widely demonstrated in humans. Although increasing evidence support the role of olfaction on dogs’ emotions and cognitive processes, very little research has been conducted on its relationship with memory in this species. The present study aimed at investigating the role of olfaction in the recall of detailed memories originally formed in the presence of a specific odor (i.e., vanilla). To test this, three groups of participants were trained with the same spatial learning task while a specific odor (i.e., vanilla) was dispersed in the testing room. Subjects were then divided in three experimental groups and after 24 h delay, they were presented with the same spatial task. The first group (Group 1) performed the task in the presence of a novel odor (i.e., control), whereas the second (Group 2) and the third group (Group 3) carried out the test in the presence of the vanilla odor and no odor (Group 3), respectively. After a brief delay, the test was presented again to the three groups of dogs: subjects of Group 1 were now tested in the presence of the vanilla odor, whereas the Group 2 was tested with the control odor. The Group 3 received no odor in both tests. A significant improvement of dogs’ performance was registered in the control-vanilla odors condition (Group 1), suggesting that the exposure to the odor presented at the encoding time would prompt the recall of spatial memories in dogs.

Mobilization of Stem Cells from the Bone Marrow Is Required for Neovascularization of Ischemic Limbs in Mice.

Blood ◽  
2005 ◽  
Vol 106 (11) ◽  
pp. 4233-4233
Author(s):  
Jeong-A Kim ◽  
Chang -Hoon Lee ◽  
Jin-A. Yoon ◽  
Woo-Sung Min ◽  
Chun-Choo Kim
Keyword(s):  
Stem Cells ◽  
Bone Marrow ◽  
Hind Limb ◽  
Limb Ischemia ◽  
Hind Limb Ischemia ◽  
Ischemic Limb ◽  
Group 3 ◽  
Group 2 ◽  
Surgically Induced ◽  
Group 1

Abstract We examined whether the injection of bone marrow mononuclear cells (BM-MNCs) or mesenchymal stem cells (MSCs) might augment angiogenesis and collateral vessel formation in a mouse model of hind limb ischemia. C57BL/6 BM-MNCs were isolated by centrifugation through a Histopaque density gradient and MSCs were obtained from C57BL/6 bone marrow and cultured in low-glucose DMEM media. Unilateral hind limb ischemia was surgically induced in C57BL/6 mice (control; n=4), and autologous BM-MNCs (Group 1; n=4, 1.8±0.2 x107/animal) or MSCs (Group 2; n=4, 1.0±0.14 x106/animal) or BM-MNCs and MSCs (Group 3; n=4, 2.3±0.1 x107 and 1.1±0.21 x106/animal) were transplanted into the ischemic tissue. Six weeks after transplantation, the group 1, group 2 and group 3 had a higher capillary/muscle ratio (0.82±0.12 vs 0.85±0.08 vs 0.97 ±0.03) than control (0.46±0.12, p&lt;0.05) (Fig. 1). This result suggested that direct local transplantation of autologous BM-MNCs or MSCs seems to be a useful strategy for therapeutic neovascularization in ischemic tissues. Next, we evaluated whether bone marrow derived stem cells were participated in the process of local injected stem cells forming new vessels. In general, mobilizing stem cells from bone marrow to local site, MMP-9 has been known as an important molecule. So we used the MMP-9 deficient KO mice and wild type, 129SvEv mice were used in the experiments. Autologous BM-MNCs and MSCs were transplanted into the ischemic limb in MMP-9 (−/−) (n=4) after unilateral hind limb ischemia was surgically induced and then the same experiments was done in MMP-9 (+/+) mice (n=4). The number of the injected BM-MNCs and MSCs was 2.2±0.05 x107 and 0.87±0.17 x106/animal in MMP-9 (−/−). And the number of the injected BM-MNCs and MSCs was 2.1±0.17 x107 and 0.98±0.09 x106/animal in MMP-9 (+/+). No difference was seen in the BM-MNCs and MSCs were injected or not (0.52±0.07 vs 0.49±0.03,) in MMP-9 (−/−). But, in the case that BM-MNCs and MSCs were injected, the higher capillary/muscle ratio was seen in MMP-9 (+/+) compared to control (0.86 ±0.09 vs 0.49±0.03, P&lt;0.05) (Fig 2). This data indicated that the mobilization of bone marrow derived stem cells would have an important role in the neovasculrization although the stem cells were injected directly into the muscle of ischemic limb. Figure Figure Figure Figure

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