Sudden Cardiac Arrest: Reliability Testing Essay

3277 words - 13 pages

Reliability Testing – by Alexander Wassell 11-30-13
Executive Summary
Sudden cardiac arrest is a health problem, claiming over 450,000 lives every year in the US. Sudden cardiac arrest is reversible, but only if treated within minutes with the aid of an electrical cardioverter shock via an automated external defibrillator (AED) or with an AED defibrillator. (Sudden Cardian Arrest, n.d.). Sudden Cardiac Arrest (SCA) is an electrical problem caused by electrical malfunction of the heart that results in no blood flow to the body and brain usually caused by an abnormal heart rhythm called ventricular fibrillation (VF).The most effective way to treat Sudden Cardiac Arrest (SCA) is through defibrillation. Medtronic has been able to provide defibrillation through the invention of cardiac defibrillators. Their product is the Medtronic Physio Control LIFEPAK 15 Defibrillator/Monitor, delivers an electrical shock to the heart in order to restore a normal heartbeat within 10 minutes in order to survive an SCA event. If defibrillation does not occur within the window of 10 minutes, the rate of survival drops to less than 5%. LIFEPAK defibrillator's estimated lifecycle is between 3 to 7 years, depending on a number of variables. This wide range prompted Medtronic’s Cardiac Rhythm Disease Management (CRDM) department to request from the engineering department a life data analysis for the product line (times-to-failure). The request, “What is your best, relatively quick, estimate of the reliability of the system over a period of time relevant to the system?”
The desire to obtain reliability results rapidly than when the data comes from products operating under normal conditions via modeling the periods of the product life is a complicated problem. After socialization with the engineering team, the best engineering judgment consensus was to select Accelerated Life Testing (ALT) as the method to quantify the life characteristics and make predictions about all of the units in the population of the LIFEPAK product. Other advantages were reduced test times, reduced time to market, lower product development costs and lower warranty costs. The engineering team conducted standard life data analysis to estimate the parameters for the Weibull life distribution that fit the data at each stress level. The team selected accelerated life test stresses to accelerate the failure modes under consideration and not introduce failure modes that would never occur under use conditions. Stress levels chosen were inside the design limits but outside the product specification limits.
The reliability of the system over a seven years period relevant to the lifecycle was determined to be 81.2%. Fitted to the Arrhenius Acceleration test model for the life of the product, it was determined from the table of percentiles in the probability plot that the confidence interval was large and not credible due to the low number of tests conducted. The Mean Time to Failure (MTTF) was determined to...

Find Another Essay On Sudden Cardiac Arrest: Reliability Testing

Pediatric Resuscitation Essay

3025 words - 12 pages involvement of the critical care team for severe or refractory cases, remain fundamental measures to minimize patient progression to pulmonary or cardiac arrest. Unfortunately, response times for formal in-hospital resuscitation teams frequently exceed 3 minutes;3-5 therefore the current poor performance6 of in-patient ward teams should be addressed as an important hospital quality assurance issue. Illustrating the importance of the initial

Cardiac Arrhythmia Essay

1421 words - 6 pages slowed or accelerated (Wilde, and Bezzina 1352–1358.) Some patients may experience the loss of consciousness, fainting spells, feel pain or discomfort in the chest, or sudden cardiac death (SCD), which is the loss of all heart function, also known as cardiac arrest, in more severe cases of cardiac arrhythmia (“Arrhythmias and Sudden Cardiac Death”.) For the more severe cases, symptoms are more likely to occur because of a structural heart

Cardiac Dysrhythmia

816 words - 4 pages defects - High blood pressure - Infections - Sleep Apnea - Overactive/Underactive thyroid gland ["Who Is at Risk for an Arrhythmia?" - NHLBI, NIH. N.p., 01 July 2011. Web. 12 Dec. 2013.] More serious symptoms of arrhythmia includes dizziness, fatigue, fainting, chest pain, shortness of breath and in severe cases, sudden cardiac arrest. Several treatment options exist for cardiac dysrhythmia. Always worth with your

This essay is step by step on how to do cpr the correct way this was writing for a description essay for a english class

706 words - 3 pages breaths and compression's. Here are a few facts about CPR since it was first founded in the 1960's. Sudden cardiac arrest is the leading cause of death in adults. Most arrests occur in persons with underlying heart disease. CPR doubles a person's chance of survival from sudden cardiac arrest. 75% of all cardiac arrests happen in people's homes. The typical victim of cardiac arrest is a man in his early 60's and a woman in her late 60's. Cardiac

Reasons to Learn CPR

752 words - 3 pages Have you ever thought about what you would do if a family member suddenly stopped breathing? Imagine that you grow up in a small town, the population is 700 people, and one morning you wake up and everyone in the town is dead. On any given day 670 people die of sudden cardiac arrest. Could it be a loved one, someone you care deeply for, or just a complete stranger? The chances are that someone in your family is going to die of sudden cardiac

Mild Therapeutic Hypothermia

1836 words - 7 pages Introduction Mild Therapeutic Hypothermia to Improve the Neurologic Outcome After Cardiac Arrest written by Michael Holzer, MD (2002) conducted research to determine if mild systemic hypothermia after resuscitation from cardiac arrest resulting from ventricular fibrillation improves neurologic recovery. Cardiac arrest is known to lead to brain ischemia in a short amount of time; by cooling the body the hope is to preserve the brain on a

Primary Care Setting: Analyzing Palpitations

1104 words - 4 pages signify a problem moderate to grave ailment. Potential life threatening conditions, in which palpitations are an associated symptom include: arrhythmias (ventricular tachycardia or ventricular fibrillation) or atrial fibrillation (a-fib). Ventricular arrhythmias are life threatening which can lead to cardiac arrest and sudden death within minutes of onset. A-fib, if left untreated can lead to potential thrombus which can cause a pulmonary emboli

Sudden Death In Athletes

611 words - 2 pages diseases have had them since they were born (Falstti, Herman).Sudden death can also occur from problems other than cardiac causes. Athletes that get addicted to drugs put themselves at a higher risk for heart related problems. Alcohol, cocaine, steroids, amphetamine, and erythropoietin (EPO) are some causes of non-natural cardiac problems (Falstti, Herman).Doctors are trying to find a way to detect which athletes are at risk of sudden death. Physical

Long-term Effects of an Expanded Cardiac Rehabilitation Program after Myocardial Infarction or Coronary Artery Bypass Surgery

1668 words - 7 pages Introduction An acute coronary syndrome is defined as a “sudden onset of myocardial ischemia which results in myocardial death, that is, a myocardial infarction.” (Citation) A myocardial infarction occurs when the blood flow is reduced in a coronary artery, usually due to excessive plaque, which results in a complete occlusion of the artery. Cardiac rehabilitation is an important aspect of continuity of care after a patient who has recently

Therapeutic Induced Hypothermia

1208 words - 5 pages demonstrated favourable outcomes, with reduced mortality in post-arrest patients” (cite). The outcome of hypothermia is not based on one person doing something correct, it relies on multiple factors. The article explains that that many patients who experience sudden cardiac arrest are not candidates for therapeutic induced hypothermia; that providing the indicated therapy is extremely challenging; that positive outcomes post-cardiac arrest are often due

Sudden Cardiac Death - Engineering Solutions

831 words - 3 pages Sudden Cardiac Deaths - Engineering Solutions Abdallah El-Falou I. INTRODUCTION UDDEN Cardiac Arrest (SCA) is one of the greatest causes Sof death and can strike an individual at any time or place, whether or not they have a diagnosed heart condition. SCA occurs because of Ventricular Fibrillation (VF) [1], a type of Cardiovascular Disease (CVD). CVD is caused by disorders of the heart and blood vessels and mainly affects people of age greater

Similar Essays

Sudden Cardiac Death Essay

1703 words - 7 pages suffer sudden cardiac arrest. Although sudden cardiac deaths are believed to be uncommon, the frequency with which such deaths occur remains largely unknown. (Maron; Pelliccia; Aeppli p.1881) A cardiac arrest is when a person’s heart stops pumping. When a person’s heart stops pumping blood doesn’t flow around their body and oxygen doesn’t reach their brian like it normally should. If an athlete suffers a cardiac arrest and their heart stops

Therapeutic Hypothermia Post Cardiac Arrest Essay

984 words - 4 pages defined as an intentional reduction of a patient’s core temperature to 32°C–34°C following ventricular fibrillation sudden cardiac arrest with return of spontaneous circulation (ROSC), and who remains unconscious, for the purposes of preventive neurologic reperfusion injury (Polderman & Herold, 2009). Unconcious adult patient s with spontaneous circulation after out of hospital cardiac arrest should be cooled to 32°C-34°C for 12 to24 Hours when the

Hypothermia Therapy For Myocardial Infarction Essay

2639 words - 11 pages Myocardial infarction (MI) which leads to cardiac arrest cause a global cerebral ischemia that results in low survival rate and poor neurological outcomes in patients resuscitate in the emergency room. The definition of out-of –the- hospital cardiac arrest (OHCA) is the cessation of cardiac mechanical activity that happens outside of a hospital environment, and is mark by a lack of signs of circulation. Each year over 250,000 persons in the

Quantitative Research Article Review

1997 words - 8 pages been focused on the spousal experiences following an acute myocardial infarction or coronary artery bypass graft surgery (Dougherty & Thompson, 2009). The researchers in this article chose to study the physical and mental health effects of the intimate partners of persons after sudden cardiac arrest and receipt of an implantable cardioverter defibrillator (ICD). Intimate partners were defined as being the spouse, lover, or significant other