1.Exercise Preferences and Barriers Among Patients With Heart Failure With Reduced Ejection Fraction or Myocardial Infarction
Mi Kyung LEE ; Chan Joo LEE ; Seon Young GOO ; Jin Young MOON ; Tae Ho LEE ; Seok-Min KANG ; Ick-Mo CHUNG ; Justin Y. JEON
Korean Circulation Journal 2024;54(12):825-835
		                        		
		                        			 Background and Objectives:
		                        			Although cardiac rehabilitation (CR) is highly recommended in patients with cardiovascular disease (CVD), participation in CR is low mainly due to access barriers. Home-based CR (HBCR) has been recommended to overcome access barriers.Exercise is a core component of CR and should be developed and implemented based on individual characteristics. We aimed to assess physical activity behaviors, exercise preferences, and exercise barriers to understand physical activity characteristics of CVD patients. 
		                        		
		                        			Methods:
		                        			Participants were patients between the ages 19 to 75 years with a history of heart failure with reduced ejection fraction (HFrEF) or myocardial infarction (MI). They completed a cross-sectional survey at a tertiary hospital's outpatient clinic from April to June 2021. Survey data included physical activity levels, patterns, preference, and barriers of exercise. 
		                        		
		                        			Results:
		                        			Participants (n=189; 143 males, 46 females, 62.1±12.0 years) were diagnosed as either HFrEF (n=160, 84.7%) or a history of MI (n=97, 51.3%). Only 26.5% of patients engaged in moderate to vigorous exercise for more than 150 minutes per week. Participants preferred exercising alone or with families. Walking (65.6%) and resistance exercises (35.4%) were favored, with outdoor (37%) and home-based (30.2%) settings preferred over fitness centers (10.6%) and hospitals (0.5%). Barriers to exercise included fatigue (34.4%), poor health perception (31.7%), and low fitness levels (30.7%). 
		                        		
		                        			Conclusions
		                        			The results of this study can be used to develop tailored HBCR programs that consider individual preferences and address specific barriers, facilitating adequate physical activity engagement. 
		                        		
		                        		
		                        		
		                        	
2.Can Astrocytes Store and Recall Memory? Yes, Indeed!
Mridula BHALLA ; C. Justin LEE
Experimental Neurobiology 2024;33(6):263-265
		                        		
		                        			
		                        			 Astrocytes have been known to support neuronal function, but until now, memory storage and recall has thought to be largely controlled by neurons. In this article, we shed light on recent research published by Williamson et al. that, for the first time, shows astrocytes to participate in memory formation and recall. 
		                        		
		                        		
		                        		
		                        	
3.Exercise Preferences and Barriers Among Patients With Heart Failure With Reduced Ejection Fraction or Myocardial Infarction
Mi Kyung LEE ; Chan Joo LEE ; Seon Young GOO ; Jin Young MOON ; Tae Ho LEE ; Seok-Min KANG ; Ick-Mo CHUNG ; Justin Y. JEON
Korean Circulation Journal 2024;54(12):825-835
		                        		
		                        			 Background and Objectives:
		                        			Although cardiac rehabilitation (CR) is highly recommended in patients with cardiovascular disease (CVD), participation in CR is low mainly due to access barriers. Home-based CR (HBCR) has been recommended to overcome access barriers.Exercise is a core component of CR and should be developed and implemented based on individual characteristics. We aimed to assess physical activity behaviors, exercise preferences, and exercise barriers to understand physical activity characteristics of CVD patients. 
		                        		
		                        			Methods:
		                        			Participants were patients between the ages 19 to 75 years with a history of heart failure with reduced ejection fraction (HFrEF) or myocardial infarction (MI). They completed a cross-sectional survey at a tertiary hospital's outpatient clinic from April to June 2021. Survey data included physical activity levels, patterns, preference, and barriers of exercise. 
		                        		
		                        			Results:
		                        			Participants (n=189; 143 males, 46 females, 62.1±12.0 years) were diagnosed as either HFrEF (n=160, 84.7%) or a history of MI (n=97, 51.3%). Only 26.5% of patients engaged in moderate to vigorous exercise for more than 150 minutes per week. Participants preferred exercising alone or with families. Walking (65.6%) and resistance exercises (35.4%) were favored, with outdoor (37%) and home-based (30.2%) settings preferred over fitness centers (10.6%) and hospitals (0.5%). Barriers to exercise included fatigue (34.4%), poor health perception (31.7%), and low fitness levels (30.7%). 
		                        		
		                        			Conclusions
		                        			The results of this study can be used to develop tailored HBCR programs that consider individual preferences and address specific barriers, facilitating adequate physical activity engagement. 
		                        		
		                        		
		                        		
		                        	
4.Adverse Events in Total Artificial Heart for End-Stage Heart Failure:Insight From the Food and Drug Administration Manufacturer and User Facility Device Experience (MAUDE)
Min Choon TAN ; Yong Hao YEO ; Jia Wei THAM ; Jian Liang TAN ; Hee Kong FONG ; Bryan E-Xin TAN ; Kwan S LEE ; Justin Z LEE
International Journal of Heart Failure 2024;6(2):76-81
		                        		
		                        			 Background and Objectives:
		                        			Real-world clinical data, outside of clinical trials and expert centers, on adverse events related to the use of SyncCardia total artificial heart (TAH) remain limited. We aim to analyze adverse events related to the use of SynCardia TAH reported to the Food and Drug Administration (FDA)’s Manufacturers and User Defined Experience (MAUDE) database. 
		                        		
		                        			Methods:
		                        			We reviewed the FDA’s MAUDE database for any adverse events involving the use of SynCardia TAH from 1/01/2012 to 9/30/2020. All the events were independently reviewed by three physicians. 
		                        		
		                        			Results:
		                        			A total of 1,512 adverse events were identified in 453 “injury and death” reports in the MAUDE database. The most common adverse events reported were infection (20.2%) and device malfunction (20.1%). These were followed by bleeding events (16.5%), respiratory failure (10.1%), cerebrovascular accident (CVA)/other neurological dysfunction (8.7%), renal dysfunction (7.5%), hepatic dysfunction (2.2%), thromboembolic events (1.8%), pericardial effusion (1.8%), and hemolysis (1%). Death was reported in 49.4% of all the reported cases (n=224/453).The most common cause of death was multiorgan failure (n=73, 32.6%), followed by CVA/other non-specific neurological dysfunction (n=44, 19.7%), sepsis (n=24, 10.7%), withdrawal of support (n=20, 8.9%), device malfunction (n=11, 4.9%), bleeding (n=7, 3.1%), respiratory failure (n=7, 3.1%), gastrointestinal disorder (n=6, 2.7%), and cardiomyopathy (n=3, 1.3%). 
		                        		
		                        			Conclusions
		                        			Infection was the most common adverse event following the implantation of TAH. Most of the deaths reported were due to multiorgan failure. Early recognition and management of any possible adverse events after the TAH implantation are essential to improve the procedural outcome and patient survival. 
		                        		
		                        		
		                        		
		                        	
5.Can Astrocytes Store and Recall Memory? Yes, Indeed!
Mridula BHALLA ; C. Justin LEE
Experimental Neurobiology 2024;33(6):263-265
		                        		
		                        			
		                        			 Astrocytes have been known to support neuronal function, but until now, memory storage and recall has thought to be largely controlled by neurons. In this article, we shed light on recent research published by Williamson et al. that, for the first time, shows astrocytes to participate in memory formation and recall. 
		                        		
		                        		
		                        		
		                        	
6.Can Astrocytes Store and Recall Memory? Yes, Indeed!
Mridula BHALLA ; C. Justin LEE
Experimental Neurobiology 2024;33(6):263-265
		                        		
		                        			
		                        			 Astrocytes have been known to support neuronal function, but until now, memory storage and recall has thought to be largely controlled by neurons. In this article, we shed light on recent research published by Williamson et al. that, for the first time, shows astrocytes to participate in memory formation and recall. 
		                        		
		                        		
		                        		
		                        	
7.Exercise Preferences and Barriers Among Patients With Heart Failure With Reduced Ejection Fraction or Myocardial Infarction
Mi Kyung LEE ; Chan Joo LEE ; Seon Young GOO ; Jin Young MOON ; Tae Ho LEE ; Seok-Min KANG ; Ick-Mo CHUNG ; Justin Y. JEON
Korean Circulation Journal 2024;54(12):825-835
		                        		
		                        			 Background and Objectives:
		                        			Although cardiac rehabilitation (CR) is highly recommended in patients with cardiovascular disease (CVD), participation in CR is low mainly due to access barriers. Home-based CR (HBCR) has been recommended to overcome access barriers.Exercise is a core component of CR and should be developed and implemented based on individual characteristics. We aimed to assess physical activity behaviors, exercise preferences, and exercise barriers to understand physical activity characteristics of CVD patients. 
		                        		
		                        			Methods:
		                        			Participants were patients between the ages 19 to 75 years with a history of heart failure with reduced ejection fraction (HFrEF) or myocardial infarction (MI). They completed a cross-sectional survey at a tertiary hospital's outpatient clinic from April to June 2021. Survey data included physical activity levels, patterns, preference, and barriers of exercise. 
		                        		
		                        			Results:
		                        			Participants (n=189; 143 males, 46 females, 62.1±12.0 years) were diagnosed as either HFrEF (n=160, 84.7%) or a history of MI (n=97, 51.3%). Only 26.5% of patients engaged in moderate to vigorous exercise for more than 150 minutes per week. Participants preferred exercising alone or with families. Walking (65.6%) and resistance exercises (35.4%) were favored, with outdoor (37%) and home-based (30.2%) settings preferred over fitness centers (10.6%) and hospitals (0.5%). Barriers to exercise included fatigue (34.4%), poor health perception (31.7%), and low fitness levels (30.7%). 
		                        		
		                        			Conclusions
		                        			The results of this study can be used to develop tailored HBCR programs that consider individual preferences and address specific barriers, facilitating adequate physical activity engagement. 
		                        		
		                        		
		                        		
		                        	
8.Can Astrocytes Store and Recall Memory? Yes, Indeed!
Mridula BHALLA ; C. Justin LEE
Experimental Neurobiology 2024;33(6):263-265
		                        		
		                        			
		                        			 Astrocytes have been known to support neuronal function, but until now, memory storage and recall has thought to be largely controlled by neurons. In this article, we shed light on recent research published by Williamson et al. that, for the first time, shows astrocytes to participate in memory formation and recall. 
		                        		
		                        		
		                        		
		                        	
9.Exercise Preferences and Barriers Among Patients With Heart Failure With Reduced Ejection Fraction or Myocardial Infarction
Mi Kyung LEE ; Chan Joo LEE ; Seon Young GOO ; Jin Young MOON ; Tae Ho LEE ; Seok-Min KANG ; Ick-Mo CHUNG ; Justin Y. JEON
Korean Circulation Journal 2024;54(12):825-835
		                        		
		                        			 Background and Objectives:
		                        			Although cardiac rehabilitation (CR) is highly recommended in patients with cardiovascular disease (CVD), participation in CR is low mainly due to access barriers. Home-based CR (HBCR) has been recommended to overcome access barriers.Exercise is a core component of CR and should be developed and implemented based on individual characteristics. We aimed to assess physical activity behaviors, exercise preferences, and exercise barriers to understand physical activity characteristics of CVD patients. 
		                        		
		                        			Methods:
		                        			Participants were patients between the ages 19 to 75 years with a history of heart failure with reduced ejection fraction (HFrEF) or myocardial infarction (MI). They completed a cross-sectional survey at a tertiary hospital's outpatient clinic from April to June 2021. Survey data included physical activity levels, patterns, preference, and barriers of exercise. 
		                        		
		                        			Results:
		                        			Participants (n=189; 143 males, 46 females, 62.1±12.0 years) were diagnosed as either HFrEF (n=160, 84.7%) or a history of MI (n=97, 51.3%). Only 26.5% of patients engaged in moderate to vigorous exercise for more than 150 minutes per week. Participants preferred exercising alone or with families. Walking (65.6%) and resistance exercises (35.4%) were favored, with outdoor (37%) and home-based (30.2%) settings preferred over fitness centers (10.6%) and hospitals (0.5%). Barriers to exercise included fatigue (34.4%), poor health perception (31.7%), and low fitness levels (30.7%). 
		                        		
		                        			Conclusions
		                        			The results of this study can be used to develop tailored HBCR programs that consider individual preferences and address specific barriers, facilitating adequate physical activity engagement. 
		                        		
		                        		
		                        		
		                        	
10.NKCC1 in Neonatal Cochlear Support Cells Reloads Ions Necessary for Cochlear Spontaneous Activity
Kwon-Woo KANG ; Kushal SHARMA ; Shi-Hyun PARK ; Jae Kwang LEE ; Justin C. LEE ; Eunyoung YI
Experimental Neurobiology 2024;33(2):68-76
		                        		
		                        			
		                        			 In the auditory system, the spontaneous activity of cochlear inner hair cells (IHCs) is initiated by the release of ATP from inner supporting cells (ISCs). This ATP release sets off a cascade, activating purinergic autoreceptors, opening of Ca 2+ -activated Cl- channel TMEM16A, Cl- efflux and osmotic cell shrinkage. Then, the shrunken ISCs efficiently regain their original volume, suggesting the existence of mechanisms for refilling Cl- and K + , priming them for subsequent activity. This study explores the potential involvement of NKCCs (Na+ -K+ -Cl- cotransporters) and KCCs (K+ -Cl- cotransporters) in ISC spontaneous activity, considering their capability to transport both Cl- and K+ ions across the cell membrane. Employing a combination of immunohistochemistry, pharmacological interventions, and shRNA experiment, we unveiled the pivotal role of NKCC1 in cochlear spontaneous activity. Immunohistochemistry revealed robust NKCC1 expression in ISCs, persisting until the 2nd postnatal week. Intriguingly, we observed a developmental shift in NKCC1 expression from ISCs to synaptophysin-positive efferent terminals at postnatal day 18, hinting at its potential involvement in modulating synaptic transmission during the post-hearing period. Experiments using bumetanide, a well-known NKCC inhibitor, supported the functional significance of NKCC1 in ISC spontaneous activity. Bumetanide significantly reduced the frequency of spontaneous extracellular potentials (sEP) and spontaneous optical changes (sOCs) in ISCs. NKCC1-shRNA experiments conducted in cultured cochlear tissues further supported these findings, demonstrating a substantial decrease in event frequency and area. Taken together, we revealed the role of NKCC1 in shaping the ISC spontaneous activity that govern auditory pathway development. 
		                        		
		                        		
		                        		
		                        	
            
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