bioe 301 - owlnet.rice.edubioe301/kortum/class/students... · cabg effectiveness 2001: 516,000 cabg...
TRANSCRIPT
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BIOE 301
Lecture Fifteen
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OutlineThe burden of heart diseaseThe cardiovascular systemHow do heart attacks happen?How do we treat atherosclerosis?
Open heart surgeryAngioplasty Stents
What is heart failure?How do we treat heart failure?
Heart transplantLeft ventricular assist devicesArtificial heart
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Early Warning Signs of Heart Attack
Many heart attacks start slowly; symptoms may come and goChest discomfort
Most heart attacks involve discomfort in the center of the chestthat lasts for more than a few minutes, or goes away and comes back. The discomfort can feel like uncomfortable pressure, squeezing, fullness, or pain
Discomfort in other areas of the upper bodyCan include pain or discomfort in one or both arms, the back, neck, jaw, or stomach
Shortness of breath Often comes along with chest discomfort. But it also can occur before chest discomfort
Other symptomsMay include breaking out in a cold sweat, nausea, or light-headedness
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Heart Attacks
Diagnosis of Atherosclerosis
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Detection of Atherosclerosis
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Access to Cardiothoracic Surgerysurgery cost and availability of trained individuals and centers are significant issues for cardiothoracic surgery worldwide.It is estimated that >10,000 cardiothoracic surgeons in >6,000 centers globally perform more than 2M open heart operations per year.
1,222 open heart operations per 1 million population in North America18 per million in Africa
translates into 1 center per 120,000 people in the USA 33 million people in Africa
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Heart Attacks
Treatment of Atherosclerosis
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How Do We Treat Atherosclerosis?
CABG
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http://www.learnaboutbypass.com/images/illustrations/bodybypasses.gif
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CABG Procedure
Patient is prepped, general anesthesiaChest access is gained, through sternumGraft vessel is retrievedExpose heart through pericardiumDivert blood through heart lung machineStop heartInsert graftReturn circulation to heartClose incision
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http://www.ctsnet.org/sections/residents/lectureseries/grandrounds/article-8.html
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Heart-Lung Machine
The heart-lung machine:Consists of a chamber that receives the blood from the bodyBlood is pumped by machine through an oxygenatorOxygenator removes CO2 and adds oxygenPump then pumps this newly oxygenated blood back to the bodyConnected to patient by a series of tubes that the surgical team places
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Heart Lung Machine
http://www.brucemindich.com/images/bypass1.gif
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Heart Lung Machine
http://www.davidfary.com/hlm_s
mall.jpg
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Heart Lung Machine
http://engr.smu.edu/~cd/EE5340/lect31/sld011.gif
http://engr.smu.edu/~cd/EE5340/lect31/sld014.gif
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CABG Effectiveness2001: 516,000 CABG surgeries performed globallyProcedure takes 4-6 hours, 5-7 day hospital stayGrafts remain open & functioning for 10-15 yrsRisks:
Heart attack (5%) Stroke (5%) (risk greatest in those over 70 years old) Death (1-2%) Sternal wound infection (1-4%)“Post-pericardiotomy syndrome“ (30%)
Occurs few days to 6 months after surgerySymptoms are fever and chest pain
Some people report memory loss and loss of mental clarity or "fuzzy thinking" following CABG
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InnovationsOff-pump CABG:
http://www.surgery.usc.edu/divisions/ct/videos-mpeg-offpumpcoronaryarterybypassgrafting.html
Closed chest CABG:http://www.hsforum.com/stories/storyReader$1537
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How Do We Treat Atherosclerosis?
Angioplasty
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PTCA: Effectiveness
Cannot always successfully perform procedure
Diffuse diseaseTotal occlusionCalcified disease
RestenosisOccurs in 25-54% of patientsUsually occurs within 6 months
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How Do We Treat Atherosclerosis?
Stent
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Stentshttp://www2.cajun.net/~wpharo/stent.jpg
http://www.insel.ch/kardio/kardiorehab/bilder/stent.jpg
http://www.wbamc.amedd.army.mil/images/newsphotos/stent%20implantation.jpg
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Stents
http://www.priory.com/cmol/stent3.jpg
http://www.hybridmedicalanimation.com/media/mdtrnc_stent
.jpg
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Drug Eluting Stents
http://www.npr.org/features/feature.php?wfId=1452217
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Comparison of RX Methods
Hospital Stay:CABG – 4-7 daysAngioplasty – 1-2 daysStent – 1-2 days
Restenosis:CABG – 5-6%, usually after 5 yearsAngioplasty – 25-45%, usually within 6 monthsStent – 15-20%, usually within 6 months
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Comparison of RX MethodsCost
CABG $35,000Angioplasty $17,000Stent $19,000
Cost-effectivenessAdditive procedures:
Within 5 years, 20-40% of patients have second PTCA, 25% have CABG
Additive costs:0 years: per patient costs of PTCA 30-50% those of CABG1 year: 50-60%3 years: 60-80%>3 years: >80%
Moving Target Problem
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What Would You Do?
AngioplastyStentCABG
A 28% decrease in coronary artery bypass operations between 1997 and 2005, and a 121% increase in stent procedures over the same period.
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Copyright ©2010 SAGE Publication Ltd.Pezzella A. T.; Asian Cardiovasc Thorac Ann 2010;18:299-310
The challenges for cardiothoracic (CT) surgery in the USA and developed countries
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Copyright ©2010 SAGE Publication Ltd.Pezzella A. T.; Asian Cardiovasc Thorac Ann 2010;18:299-310
The challenges for cardiothoracic (CT) surgery in developing countries
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Cost-EffectivenessTherapy Patient Group $ per yr life
savedtPA Post MI high risk $3,600
tPA Acute MI, large infarct, treatment started >2
hours post
$24,200
Counseling Smoking cessation $1300-$3900CABG Two vessel disease,
severe angina$9,200-$42,500
http://www.sciencedirect.com/science?_ob=ArticleURL&_aset=B-WA-A-A-A-MsSAYZA-UUA AUYWDCBYZYAUYUBBVZZYBWAUBWEUBAU&_rdoc=1&_fmt=full&_udi=B6T1048NJXK25&_coverDate=5%2F22%2F2003&_cdi=4876&_orig=search&_st=13&_sort=d&view=c&_acct=C000004378&_version 1&_urlVersion=0&_userid=108429&md5=5f493caa5f65762c23c0d90eaea8b92d
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Prevention or Treatment?
http://www.nytimes.com/2004/03/21/health/21HEAR.html
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Progression of Heart Disease
High Blood PressureHigh Cholesterol Levels
Atherosclerosis
Ischemia
Heart Attack
Heart Failure