Cardiology Commons^™

Pericardial Effusions And Cardiac Tamponade In Hospitalized Systemic Sclerosis Patients: Analysis Of The National Inpatient Sample, Bikash Basyal, Waqas Ullah, Chris T. Derk

Abington Jefferson Health Papers

Introduction

Clinically significant pericardial effusions and cardiac tamponade in systemic sclerosis (SSc) patients is uncommon and the factors that contribute to progression of pericardial involvement in SSc patients have not been well established.

Methods

A review of the national inpatient sample database was performed looking SSc related hospitalizations between 2002 and 2019. Data was collected on patients with pericardial effusions and cardiac tamponade and analyzed to identify and describe patient characteristics and comorbidities.

Results

Out of a total of 523,410 SSc hospitalizations, with an overall inpatient mortality rate of 4.7% (24,764 patients), pericardial effusion was identified in 3.1% of all …

Dipyridamole-Induced Stemi: Case Report And Review Of The Literature, Hussam Al Hennawi, Sunita Lakhani, Shayan Iqbal Khan, Sarin Atam, Usama Sadiq, Joseph Rigotti, Abhinav Nair

Abington Jefferson Health Papers

Dipyridamole nuclear myocardial perfusion imaging is a safe and useful modality to assess for myocardial ischemia. It is the modality of choice for cardiac risk stratification in patients unable to exercise. Intravenous dipyridamole causes coronary vasodilation and may yield heterogeneity of coronary blood flow in significant coronary artery disease. Ischemic electrocardiographic changes following pharmacologic stress testing are less likely compared to exercise stress tests. Ischemia more likely presents in the form of ST depression, with ST-elevation being exceedingly rare. We present a case of a 73-year-old patient who developed ST-elevation myocardial infarction following pharmacologic stress testing.

Effect Of Fibrinolytic Therapy On St-Elevation Myocardial Infarction Clinical Outcomes During The Covid-19 Pandemic: A Systematic Review And Meta-Analysis, Anwar Khedr, Hussam Al Hennawi, Muhammed Khuzzaim Khan, Mostafa Elbanna, Abbas B. Jama, Ekaterina Proskuriakova, Hisham Mushtaq, Mikael Mir, Sydney Boike, Ibtisam Rauf, Aalaa Eissa, Meritxell Urtecho, Thoyaja Koritala, Nitesh Jain, Lokesh Goyal, Salim Surani, Syed A Khan

Abington Jefferson Health Papers

BACKGROUND: ST-elevation myocardial infarction (STEMI) is the result of transmural ischemia of the myocardium and is associated with a high mortality rate. Primary percutaneous coronary intervention (PPCI) is the recommended first-line treatment strategy for patients with STEMI. The timely delivery of PPCI became extremely challenging for STEMI patients during the coronavirus disease 2019 (COVID-19) pandemic, leading to a projected steep rise in mortality. These delays were overcome by the shift from first-line therapy and the development of modern fibrinolytic-based reperfusion. It is unclear whether fibrinolytic-based reperfusion therapy is effective in improving STEMI endpoints.

AIM: To determine the incidence of fibrinolytic …

Reduced Heart Failure-Related Healthcare Costs With Furoscix Versus In-Hospital Intravenous Diuresis In Heart Failure Patients: The Freedom-Hf Study, Daniel Bensimhon, William S. Weintraub, William Frank Peacock, Tamas Alexy, Dalton Mclean, Donald C. Haas, Kathleen L. Deering, Stefanie J. Millar, Matthew M. Goodwin, John F. Mohr

Abington Jefferson Health Papers

Aim: Compare heart failure (HF) costs of Furoscix use at home compared with inpatient intravenous (IV) diuresis.

Patients & methods: Prospective, case control study of chronic HF patients presenting to emergency department (ED) with worsening congestion discharged to receive Furoscix 80 mg/10 ml 5-h subcutaneous infusion for ≤7 days. 30-day HF-related costs in Furoscix group derived from commercial claims database compared with matched historical patients hospitalized for <72 h.

Results: Of 24 Furoscix patients, 1 (4.2%) was hospitalized in 30-day period. 66 control patients identified and were well-matched for age, sex, ejection fraction (EF), renal function and other comorbidities. Furoscix patients had …

Delayed Presentation Of Biopsy-Proven Eosinophilic Myocarditis Following Covid-19 Mrna Vaccine, Chaitra Janga, Tirth Patel, Hussam Al Hennawi, Sarin Atam, Shreeja Shah Shah, Ifrah Naeem, Rahat Memon, Donald C. Haas

Abington Jefferson Health Papers

Myopericarditis associated with COVID-19 mRNA vaccines has been recognized as an uncommon adverse reaction, especially among young, healthy adult males. Eosinophilic myocarditis is a rare form of inflammation reflecting a hypersensitivity reaction following an inciting event commonly caused by drugs including vaccines. Eosinophilic myocarditis, a subtype of myocarditis, is characterized by eosinophilic myocardial infiltrates. It is usually accompanied by systemic eosinophilia in the form of a drug reaction with eosinophilia and systemic symptoms (DRESS) syndrome and is rarely associated with myocyte fibrosis and/or necrosis. In this report, we present a case of biopsy-proven eosinophilic myocarditis in a 24-year-old male patient, …

Variance In Management Of Extracorporeal Membrane Oxygenation-Associated Fibrin Sheaths At A Single Institution, Alexandra Tedesco Md, Monica Majumdar Md, Jamel P. Ortoleva Md, Christine Nayar Md, Masashi Kawabori Md, Payam Salehi Md, Ali Irshad Md

Abington Jefferson Health Papers

Objective: Extracorporeal membrane oxygenation (ECMO) support for patients with cardiac or respiratory failure has been increasingly used by advanced critical care practitioners. The thromboembolic complications of ECMO have been extensively discussed and researched; however, research and discussion on the development, risks, and management of cannulae-associated fibrin sheaths are lacking.

Methods: Institutional review board approval was not required. We have presented three cases detailing the identifi- cation and individualized management of ECMO-associated fibrin sheaths at our institution. The three patients provided written informed consent for the report of their case details and imaging studies.

Results: Of our three patients with ECMO-associated …

Reducing The Risk Of Mortality In Chronic Obstructive Pulmonary Disease With Pharmacotherapy: A Narrative Review, Matthew Mintz, Igor Barjaktarevic, Donald A. Mahler, Barry Make, Neil Skolnik, Barbara Yawn, Bree Zeyzus-Johns, Nicola A. Hanania

Abington Jefferson Health Papers

In 2020, chronic obstructive pulmonary disease (COPD) was the fifth leading cause of death in the United States excluding COVID-19, and its mortality burden has been rising since the 1980s. Smoking cessation, long-term oxygen therapy, noninvasive ventilation, and lung volume reduction surgery have had a beneficial effect on mortality; however, until recently, the effects of pharmacologic therapies on all-cause mortality have been unclear. Inhaled pharmacologic treatments for patients with COPD include combinations of long-acting muscarinic receptor antagonists (LAMAs), long-acting-β2-agonists (LABAs), and inhaled corticosteroids (ICS). The recent IMPACT and ETHOS clinical trials reported mortality benefits with ICS/LAMA/LABA triple therapy compared with …

Ten Year Real World Experience With Ultrafiltration For The Management Of Acute Decompensated Heart Failure, Donald C. Haas, Maureen Hummel, Patricia Barrella, Waqas Ullah, Misung Yi, Robert Watson

Abington Jefferson Health Papers

Background: Randomized controlled trials (RCT) of ultrafiltration (UF) have demonstrated conflicting results regarding its efficacy and safety.

Objective: We reviewed 10 years of data for adjustable UF during heart failure hospitalizations in a real world cohort.

Methods: We performed a retrospective, single center analysis of 335 consecutive patients treated with adjustable rate UF using the CHF Solutions Aquadex Flex Flo System from 2009 to 2019.

Results: Compared to previous RCTs investigating UF, our cohort was older, with worse renal impairment and more antecedent HF hospitalizations in the year preceding therapy. Mean fluid removal with UF was 14.6 l. Mean weight …

The Undesirable Communication: A Case Of Cerebral Air Emboli In The Setting Of Atrio-Esophageal Fistula Following Atrial Fibrillation Catheter Ablation, Momin Islam, Hussam Al Hennawi, Anwar Khedr, Khaled Harmouch, Mohammad F. Mathbout

Abington Jefferson Health Papers

Atrial-esophageal fistula is an extremely rare condition but is often a deleterious complication following catheter ablation for atrial fibrillation. The associated iatrogenic communication acts as a conduit for air and bacterial translocation, which may lead to cerebral air embolism and polymicrobial sepsis, respectively. Coupled with a history of invasive procedures, the diagnosis is largely based on the accompanying neurological symptoms. In this report, we present the case of a 73-year-old female who presented with neurological deficits attributed to cerebral vascular emboli three weeks after catheter ablation for the treatment of chronic atrial fibrillation.

The Curious Case Of An Isolated Right Coronary Artery Aneurysm Complicated By Thrombosis And Distal Embolization, Hussam Al Hennawi, Mohammad F. Mathbout, Katrina Bidwell, Christopher D. Nielsen

Abington Jefferson Health Papers

No abstract provided.

Inari Large-Bore Mechanical Thrombectomy In Intermediate-High Risk Submassive Pe Patients: Case Series And Literature Review, Mohammad F. Mathbout, Hussam Al Hennawi, Anwar Khedr, Medical University Of South Carolina, Thomas M. Todoran

Abington Jefferson Health Papers

Pulmonary embolism (PE) is one of the most common causes of cardiovascular (CV) mortality worldwide. Owing to the associated morbidity and mortality with other treatment modalities, including systemic thrombolysis, a discernible change in the era of acute pulmonary embolism management has been reported. Catheter-directed thrombectomy using the FlowTriever system (Inari Medical; Irvine, CA, USA) was shown to reduce endpoints of interest in patients with acute intermediate-high risk PE and was associated with rapid hemodynamic improvement. In this report, we describe our experience with three cases of patients presenting with submassive PE, whereby immediate pulmonary artery pressure improvement was evident in …

Caregiver Health-Related Quality Of Life, Burden, And Patient Outcomes In Ambulatory Advanced Heart Failure: A Report From Revival., Nisha A. Gilotra, Salpy V. Pamboukian, Maria Mountis, Shawn W. Robinson, Michelle Kittleson, Keyur B. Shah, Rhondalyn C. Forde-Mclean, Donald C. Haas, Douglas A. Horstmanshof, Ulrich P. Jorde, Stuart D. Russell, Wendy C. Taddei-Peters, Neal Jeffries, Shokoufeh Khalatbari, Catherine A. Spino, Blair Richards, Matheos Yosef, Douglas L. Mann, Garrick C. Stewart, Keith D. Aaronson, Kathleen L. Grady

Abington Jefferson Health Papers

Background

Heart failure (HF) imposes significant burden on patients and caregivers. Longitudinal data on caregiver health‐related quality of life (HRQOL) and burden in ambulatory advanced HF are limited.

Methods and Results

Ambulatory patients with advanced HF (n=400) and their participating caregivers (n=95) enrolled in REVIVAL (Registry Evaluation of Vital Information for VADs [Ventricular Assist Devices] in Ambulatory Life) were followed up for 24 months, or until patient death, left ventricular assist device implantation, heart transplantation, or loss to follow‐up. Caregiver HRQOL (EuroQol Visual Analog Scale) and burden (Oberst Caregiving Burden Scale) did not change significantly from baseline to follow‐up. At …

Predictors Of Permanent Pacemaker Implantation In Patients Undergoing Transcatheter Aortic Valve Replacement - A Systematic Review And Meta-Analysis., Waqas Ullah, Salman Zahid, Syeda Ramsha Zaidi, Deepika Sarvepalli, Shujaul Haq, Sohaib Roomi, Maryam Mukhtar, Muhammad Atif Khan, Smitha Narayana Gowda, Nicholas Ruggiero, Alec Vishnevsky, David L. Fischman

Abington Jefferson Health Papers

Background As transcatheter aortic valve replacement (TAVR) technology expands to healthy and lower-risk populations, the burden and predictors of procedure-related complications including the need for permanent pacemaker (PPM) implantation needs to be identified.

Methods and Results Digital databases were systematically searched to identify studies reporting the incidence of PPM implantation after TAVR. A random- and fixed-effects model was used to calculate unadjusted odds ratios (OR) for all predictors. A total of 78 studies, recruiting 31 261 patients were included in the final analysis. Overall, 6212 patients required a PPM, with a mean of 18.9% PPM per study and net rate …

Rv Lead Placement - A Forgotten Cause Of Right Heart Failure., Muhammad Arslan Cheema, Talal Almas, Waqas Ullah, Donald C. Haas

Abington Jefferson Health Papers

Introduction: Cardiac implantable electronic devices (CIEDs) have opened new doors, improving the quality, and increasing the duration of life by providing support of heart rate, atrioventricular and interventricular synchrony, thereby preventing sudden cardiac death. Nevertheless, these devices can pose some risks to the patients, including pacemaker-mediated cardiomyopathy and endocarditis.

Case presentation: We elucidate the case of a patient who had severe Tricuspid Regurgitation as a result of single chamber Implantable Cardioverter Defibrillator (ICD) placement which led to right heart failure (RHF). His chief complaints were generalized fatigability and difficulty climbing steps at home. He also had orthopnea but denies paroxysmal …

Partial Vena Cava Occlusion (Vco) To Counteract Refractory Heart Failure: A New Era In Interventional Heart Failure Strategy., Yasar Sattar, Monil Majmundar, Talal Almas, David Song, Waqas Ullah, Homam Moussa Pacha, Mohamed Zghouzi, Islam Y Elgendy, Fatir Murtaza, M Chadi Alraies

Abington Jefferson Health Papers

Background: Patients with acute decompensated heart failure are prone to recurrent exacerbation leading to poor quality of life when they do not respond to an optimal medical regimen. Due to the lack of linear positive inotropy response to increasing preload in heart failure patients, increasing preload is associated with poor outcomes. Partial occlusion of either IVC or SVC is a proposed novel treatment that can improve cardiac function or quality of life by altering preload/pressure in heart failure (HF) patients unresponsive to diuretics.

Methods: PubMed, Ovid (MEDLINE), and Cochrane database we searched using the MeSH terms including "Superior vena cava …

Effects Of Left Ventricular Assist Device On Pulmonary Functions And Pulmonary Hemodynamics: A Meta-Analysis, Waqas Ullah, Casey Meizinger, Zain Ali, Ankur Panchal, Rehan Saeed, Donald C. Haas, Eduardo Rame

Abington Jefferson Health Papers

BACKGROUND: Given current evidence, the effect of left ventricular assist device (LVAD) implantation on pulmonary function tests remains controversial.

AIM: To better understand the factors contributing to the changes seen on pulmonary function testing and the correlation with pulmonary hemodynamics after LVAD implantation.

METHODS: Electronic databases were queried to identify relevant articles. The summary effect size was estimated as a difference of overall means and standard deviation on a random-effects model.

RESULTS: A total of four studies comprising 219 patients were included. The overall mean forced expiratory volume in one second (FEV1), forced vital capacity (FVC) and diffusion lung capacity …

Safety And Efficacy Of Soluble Guanylate Cyclase Stimulators In Patients With Heart Failure: A Systematic Review And Meta-Analysis., Waqas Ullah, Maryam Mukhtar, Aws Al-Mukhtar, Rehan Saeed, Margot Boigon, Donald Haas, Eduardo. Rame

Abington Jefferson Health Papers

BACKGROUND: The utility of novel oral soluble guanylate cyclase (sGC) stimulators (vericiguat and riociguat), in patients with reduced or preserved ejection fraction heart failure (HFrEF/HFpEF) is currently unclear.

AIM: To determine the efficacy and safety of sGC stimulators in HF patients.

METHODS: Multiple databases were searched to identify relevant randomized controlled trials (RCTs). Data on the safety and efficacy of sGC stimulators were compared using relative risk ratio (RR) on a random effect model.

RESULTS: Six RCTs, comprising 5604 patients (2801 in sGC stimulator group and 2803 placebo group) were included. The primary endpoint (a composite of cardiovascular mortality and …

The Difficult Clinical Decision Of Thrombolytic Therapy For Submassive Pulmonary Embolism In A Community Hospital., Qian Zhang, Jonathan Vayalumkal, John Ricely, Daniel L. Gray, Ahmad Raza

Abington Jefferson Health Papers

Submassive or intermediate-risk pulmonary embolism (PE) occurs when an acute PE episode is associated with radiographic evidence of right heart strain without hemodynamic instability. Further risk stratification is important in determining whether systemic thrombolytic therapy should be administered when weighing the risks and benefits. It includes the risk of death from acute PE versus the risk of bleeding. This decision could be further complicated in institutions where there is a lack of complete therapeutic options, which increases the importance of the expertise of a pulmonologist or an intensivist to decide whether rescue reperfusion is needed. We describe the case of …

Survival Analysis Based On The Duration Of Cpr After In-Hospital Cardiac Arrest, Ahmad Raza, Nayab Nadeem, Ahmad Arslan, Zain Ali, Qian Zhang, Usama Sadiq, Rajesh Patel

Abington Jefferson Health Papers

No abstract provided.

Acute Covid-19 Induced Fulminant Systemic Vascular Thrombosis: A Novel Entity., Zain Ali, Waqas Ullah, Rehan Saeed, Ammar Ashfaq, Bilal Lashari, Md

Abington Jefferson Health Papers

No abstract provided.

Percutaneous Intervention Or Bypass Graft For Left Main Coronary Artery Disease? A Systematic Review And Meta-Analysis, Waqas Ullah, Yasar Sattar, Irfan Ullah, Ammu Susheela, Maryam Mukhtar, M Chadi Alraies, Mamas A Mamas, D L Fischman

Abington Jefferson Health Papers

Background: The safety and efficacy of percutaneous coronary intervention (PCI) versus coronary artery bypass grafting (CABG) for stable left main coronary artery disease (LMCAD) remains controversial.

Methods: Digital databases were searched to compare the major adverse cardiovascular and cerebrovascular events (MACCE) and its components. A random effect model was used to compute an unadjusted odds ratio (OR).

Results: A total of 43 studies (37 observational and 6 RCTs) consisting of 29,187 patients (PCI 13,709 and CABG 15,478) were identified. The 30-day rate of MACCE (OR, 0.56; 95% CI, 0.42-0.76;

Conclusion: PCI might offer early safety advantages, while CABG provides greater …

As The Covid-19 Pandemic Drags On, Where Have All The Stemis Gone?, Waqas Ullah, Yasar Sattar, Rehan Saeed, Asrar Ahmad, Margot I. Boigon, Donald C. Haas, M. Chadi Alraies

Abington Jefferson Health Papers

In the midst of current pandemic individuals with all sorts of medical ailments are afraid to venture into health-care settings and risk contracting Coronavirus disease 2019 (COVID-19). Irrespective of the inherent thromboembolic risks associated with COVID-19, this puts patients at high risk of cardiac complications

Outcomes Of Open Mitral Valve Replacement Versus Transcatheter Mitral Valve Repair; Insight From The National Inpatient Sample Database., Waqas Ullah, Yasar Sattar, Maryam Mukhtar, Hafez M. Abdullah, Vincent M. Figueredo, Donald C. Haas, David L. Fischman, M. Chadi Alraies

Abington Jefferson Health Papers

Background: Transcatheter mitral valve repair and replacement (TMVR) is a minimally invasive alternative to conventional open-heart mitral valve replacement (OMVR). The present study aims to compare the burden, demographics, cost, and complications of TMVR and OMVR.

Methods: The United States National Inpatient Sample (US-NIS) for the year 2017 was queried to identify all cases of TMVR and OMVR. Categorical and continuous data were analyzed using Pearson chi-square and independent t-test analysis, respectively. An adjusted odds ratio (aOR) based on the ordinal logistic regression (OLR) model was calculated to determine the association between outcome variables.

Results: Of 19,580 patients, 18,460 …

A Rare Case Report And Literature Review Of Anabolic-Androgenic Steroids (Aas)-Induced Acute Myocardial Infarction, Qian Zhang, Khine S. Shan, Ahmad Raza, Neelima Manda, Travis Nace

Abington Jefferson Health Papers

Anabolic-androgenic steroids (AAS) are synthetic drugs manufactured to mimic the male sex hormone testosterone [1]. They are usually prescribed for medical conditions including but not limited to impotence in males, endometriosis, hypogonadism, and aplastic anemia [2]. It has also been used historically by athletes and bodybuilders to enhance performance as it can stimulate protein synthesis leading to an increase in muscle size and strength [3]. However, the use of AAS has become a serious global public health dilemma as it has been used widely by the general population to improve physical strength and appearance [1]. In …

A Rare Case Of Coronary Artery Thrombosis In A Patient With Recently Diagnosed Giant Cell Arteritis: Is Anticardiolipin Antibody Involved?, Khine S. Shan, Qian Zhang, Sharmila Bisaria, Anubha Tewary

Abington Jefferson Health Papers

Giant cell arteritis (GCA) is an immune-mediated systemic inflammation of large-sized arteries that predominantly affects elderly women. It may be considered as one of the risk factors for acute coronary syndrome (ACS). Moreover, patients with GCA may have increased anticardiolipin antibodies (aCL). However, its relationship with antiphospholipid syndrome (APS) is not clear. We present a case of a unique presentation of GCA with a connection to both ACS and APS. A 76-year-old woman who initially presented to the hospital with a chief complaint of intermittent unilateral headache, blurry vision along with transient aphasia was found to have a biopsy confirmed …

Role Of Echocardiography In Diagnostic Evaluation Of Patients Admitted To Observation Unit., Muhammad Arslan Cheema, Hafez Mohammad Ammar Abdullah, Waqas Ullah, Yasar Sattar, Shujaul Haq, Khadija Cheema, Asrar Ahmad, Zain Ali, Asoka Balaratna

Abington Jefferson Health Papers

BACKGROUND: Syncope is a transient loss of consciousness due to transient decrease in cerebral perfusion. Syncope accounts for a 3-6% of all emergency department visits. Etiology of syncope can be neural, cardiogenic, or vascular. Previous studies have evaluated the types and management of syncope. Echocardiography is a commonly used test in the evaluation of causes of syncope. Whether the benefit compared to financial burden of this diagnostic study is in all subsets of syncope cases remains unclear.

AIM: To evaluate the impact of echocardiography in the diagnostic evaluation of syncope and to evaluate the subset of patients that would benefit …

Left Ventricular Pseudoaneurysm: An Overview Of Diagnosis And Management., Faisal Inayat, Ali Raza Ghani, Iqra Riaz, Nouman Safdar Ali, Usman Sarwar, Raphael Bonita, Hafeez Ul Hassan Virk

Abington Jefferson Health Papers

Left ventricular pseudoaneurysm is a rare but life-threatening disorder that is frequently reported secondary to myocardial infarction or cardiac surgery. In this article, we chronicle the case of a patient with no prior risk factors who presented with a 2-week history of nonexertional atypical left chest pain. Apical 2-chamber transthoracic echocardiography revealed an unexpected outpouching of basal inferoseptal wall of the left ventricle, which had a narrow neck and relatively wide apex. The patient was diagnosed with left ventricular pseudoaneurysm and medical therapy was initiated. He refused to undergo the surgical intervention and subsequently, he was discharged from the hospital …

Spontaneous Coronary Artery Dissection: A Case Series Of 9 Patients With Literature Review., Ali Raza Ghani, Md, Faisal Inayat, Nouman Safdar Ali, Reema Anjum, Michael Viray, Arsalan Talib Hashmi, Iqra Riaz, Bruce D. Klugherz, Hafeez Ul Hassan Virk

Abington Jefferson Health Papers

Spontaneous coronary artery dissection is an increasingly recognized nonatherosclerotic cause of acute coronary syndrome. Reports regarding the prognosis and natural history of this disease are limited. In addition to the diagnostic difficulty, this condition poses a significant therapeutic challenge due to the lack of specific management guidelines. We present here a case series of 9 patients with spontaneous coronary artery dissection. Additionally, this article reviews the incidence, clinical characteristics, risk factors, diagnostic modalities, therapeutic approaches, and patterns of recurrence in patients with spontaneous coronary artery dissection.

Deciphering A Case Of Pulmonary Hypertension In A Young Female: Partial Anomalous Pulmonary Venous Drainage The Culprit, Hiten R. Patel, Suchit Bhutani, Fayez Shamoon, Hartaj Virk

Abington Jefferson Health Papers

Partial anomalous pulmonary venous drainage (PAPVD) is a rare congenital cardiac defect and is associated with sinus venosus atrial septal defect. While most cases are asymptomatic, a patient can present with pulmonary hypertension (PHTN) and it can be difficult to diagnose. Here, we discuss the case of a young female with PHTN who was found to have two right-sided PAPVD. Through this case, authors try to emphasize the importance of meticulous and thorough investigation when evaluating PHTN, which allows for correct diagnosis and a timely intervention before PHTN becomes irreversible.