|
Sudden cardiac death (SCD), also called cardiac arrest, is used to
describe a situation in which the heart abruptly and without warning
stops working, so no blood can be pumped to the rest of the body. It is
responsible for half of all heart disease deaths.
Click here for basic facts on Sudden Cardiac Death
Sudden cardiac death occurs when the heart’s electrical system
malfunctions. It is not a heart attack (also known as a myocardial
infarcation). A heart attack is when a blockage in a blood vessel
interrupts the flow of oxygen-rich blood to the heart, causing heart
muscle to die. So if the heart can be compared to a house, SCD occurs
when there is an electrical problem and a heart attack – when the
problem is the plumbing.
The most common cause of cardiac arrest is a heart rhythm disorder or
arrhythmia called ventricular fibrillation (VF). The heart has a
built-in electrical system. In a healthy heart, a “pace- maker” triggers
the heartbeat, then electrical impulses run along pathways in the heart,
causing it to contract in a regular, rhythmic way. When a con- traction
happens, blood is pumped. But in ventricular fibrillation, the elec-
trical signals that control the pumping of the heart suddenly become
rapid and chaotic. As a result, the lower chambers of the heart, the
ventricles, begin to quiver (fibrillate) instead of contract, and they
can no longer pump blood from the heart to the rest of the body. If
blood cannot flow to the brain, it becomes starved of oxygen, and the
person loses consciousness in seconds. Unless an emergency shock is
delivered to the heart to restore its regular rhythm, using a machine
called a defibrillator, death can occur within minutes. It’s estimated
that more than 70% of ventricular fibrillation victims die before
reaching the hospital.
Who Is At Risk?
SCD often occurs in active, outwardly healthy people with no known heart
disease or other health problems. But the truth is that sudden cardiac
death is not a random event. Most victims do have heart diseases or
other health problems, although they may not know it.
There are numerous contributors to cardiac arrest, but two of the most
important ones are:
* A previous heart attack: 75% of the people who die of SCD show signs
of a previous heart attack.
* Coronary artery disease: 80% of SCD’s victims have signs of coronary
artery disease. This is a condition in which the arteries that supply
blood to the heart are narrowed or blocked.
There are also a number of symptoms and signs that may indicate that a
person is at increased risk for SCD. These include:
* An abnormal heart rate or rhythm (arrhythmia) of unknown cause
* An unusually rapid heart rate (tachycardia) that comes and goes, even
when the person is at rest
* Episodes of fainting (called syncope) of unknown cause
* A low ejection fraction (EF): The ejection fraction is a measurement
of how much blood is pumped by the ventricles with each heart beat. A
healthy heart pumps 55% or more of its blood with each beat. People at
highest risk for SCD have ejection fractions of less than 40%, combined
with ventricular tachycardia, an abnormally fast heart rate in the lower
chambers of the heart.
Are You At Risk?
Tests That Predict Risk
There are a number of tests that can be performed to determine if
someone is in a group that is at high risk for cardiac arrest. These
include:
Echocardiogram – a painless test in which sound waves are used to create
a moving picture of the heart. The test can measure the pumping ability
of the heart and identify other problems that may increase a person’s
risk for SCD.
Electrocardiogram – A painless test in which electrodes are attached to
the patient’s chest to record the electrical activity of the heart in
order to identify abnormal heart rhythms. Certain arrhythmias could
point to an increased risk of SCD.
Holter monitor – A Walkman-size recorder that patients attach to their
chest for one to two days, recording a longer sampling of their heart
rhythm. After the recorder is removed, the tape is analyzed for signs of
arrhythmia.
Event recorder – a pager-sized device that also records the electrical
activity of the heart over a longer period of time. Unlike a holter
monitor, it does not operate continuously. Instead, patients turn on the
device whenever they feel their heart beating too quickly or
chaotically.
Electrophysiology study (EPS) – This test is performed at a hospital or
clinic. A local anesthetic is used to numb areas in the groin or neck
and thin flexible wires called catheters are snaked up to the heart to
record its electrical signals. During the study, the electrophysiologist
studies the speed and flow of electrical signals through the heart,
identifies rhythm problems and pinpoints areas in the heart that may be
the sources of abnormal electrical signals that trigger arrhythmias. The
physician can also determine if a patient has had a prior heart attack
or evidence of prior heart damage without knowing it. All of this
information can help determine whether the patient is in a group at
higher risk for SCD.
Prevention
There are a number of things people can do to decrease the likelihood of
becoming a victim of sudden cardiac death. To begin with, living a
“heart healthy” life can help reduce the chances of dying of cardiac
arrest or other heart conditions. This includes exercising regularly,
eating healthful foods, maintaining a reasonable weight and avoiding
smoking. Treating and monitoring diseases and conditions that can
contribute to heart problems, including high blood pressure, high
cholesterol and diabetes, is also important.
Finally, for some patients, preventing sudden cardiac death means
controlling or stopping the abnormal heart rhythms that may trigger
ventricular fibrillation. Treating arrhythmias is done in three ways:
Medications – Medications, including ACE inhibitors, beta blockers,
calcium channel blockers and other antiarrhythmics, can control abnormal
heart rhythms or treat other conditions that may contribute to heart
disease or SCD. But taking medication alone has not proved to be very
effective in reducing cardiac arrest. These medications are sometimes
taken by patients who also have an ICD, in order to reduce how often it
fires.
Implantable cardioverter defibrillators (ICDs) – These devices have been
very successful in preventing sudden cardiac death in certain high-risk
patients. Like a pacemaker, ICDs are implanted under the skin. Wires
called leads run from the ICD to the heart, and the device monitors the
heart to detect any abnormal rhythms. If a dangerous arrhythmia is
detected, the ICD delivers an electrical shock to restore the heart’s
normal rhythm and prevent sudden cardiac death. The ICD can also act
like a pacemaker if the heart is beating too slowly.
Catheter Ablation – In this tech- nique, radiofrequency energy (heat),
cryotherapy (freezing), or other energy forms are used to destroy small
areas of heart muscle that give rise to the abnormal electrical signals
that cause rapid or irregular heart rhythms. The energy is delivered
through catheters that are snaked through the veins or arteries to the
heart. Catheter ablation is sometimes done in patients who have an ICD
to decrease the frequency of abnormal heart rhythms, and again, to
reduce how often the device fires.
Posted in Implantable cardioverter defibrillator, Why do I need an ICD?
| No Comments »
Monday, December 4th, 2006
Somes v. United Airlines, Inc.
In 1995, 39 year old Steven Somes died of a cardiac arrest on a United
Airlines flight from Boston to San Francisco. The claim against United
was based on the failure to have an automatic external defibrillator
(”AED”) on board Mr. Somes’ plane, which would have saved his life.
Several obstacles stood in the way of successful resolution: AEDs had
not been required by the federal government in 1995; no major U.S.
airline carried them in 1995; and the extensive regulation of airlines
by the federal government gave basis to a defense that federal law
preempted state law, such that no claim was available.
Paul, John, and Ronald Kidd and John Sikorski of Robinson Donovan made
extensive investigation into the medical aspects of cardiac arrest, the
technological history of AEDs, the U.S. passenger airline industry, and
use of AEDs by foreign airlines beginning in the early 1990s. On behalf
of Steven Somes’s widow Jamie, a wrongful death action was filed against
United in January 1998.
The memorandum of law against preemption was prepared by John and Paul.
Federal District Court Judge Morris Lasker largely adopted its reasoning
in his lengthy written opinion. Pre-trial discovery included extensive
motion practice and depositions in England and France. In the course of
obtaining complete records of the airline industry’s internal
deliberations on the subject of AEDs, Paul and John obtained substantial
sanctions against the principal lobby group of the U.S. domestic airline
industry, the Washington D.C.-based Airline Transport Association.
Somes’ lawyers were prepared to prove that United - like most other
major U.S. airlines - was well aware in 1995 of the inexpensive,
reliable, and proven life-saving capacity of AEDs, but refused to
install them on grounds of cost. United settled the case before trial,
the terms of which remain confidential.
According to a recent New York Times assessment, the Somes case was
instrumental in prompting the U.S. airline industry to carry AEDs on
passenger planes. The case has also been recognized as a milestone in
the cause of Public Access Defibrillation (”PAD”), countering the
wide-spread but misguided perception that supposed liabilities
associated with AEDs outweigh the benefits of installing them. Paul and
John, in collaboration with Robinson Donovan, continue to handle
wrongful death claims against airlines for failure to have an AED,
including suits filed in Chicago against Continental Airlines, which was
settled in the summer of 2002, and against Frontier Airlines, which
settled shortly before trial.
Posted in Automated external defibrillators | No Comments »
Automated external defibrillators
Monday, December 4th, 2006
Every Houston Independent School District campus will soon be equipped
with an automated external defibrillator. The device is used to shock a
heart and restore its normal beating rhythm.
The school board is expected to accept 300 donated defibrillators from
the Texas Arrhythmia Institute next week. The total value is about
$650,000. The campuses need to send their nurses and other key personnel
to training sessions beginning next month.
In the past few years, several student athletes have died suddenly of
cardiac arrest, according to Dr. Nadim Nasir Jr., a cardiologist and
senior researcher for the Houston-based Texas Arrhythmia Institute. The
device’s life-saving potential can be important not only for students,
but also for staff members and visitors.
Officials believe the donation will make HISD the largest American
school district to outfit all of its schools with defibrillators.
STRATFORD —I’ll Take Manhattan, a deli, celebrated its grand opening on
Friday at 955 Ferry Blvd. The owners were giving away samples from its
menu to raise money to buy defibrillators.The defibrillators are used to
restore cardiac function when people suffering from a heart attack. Each
device costs $2,500.
When a person has a sudden heart attack, these defibrillators can be the
difference between life and death, according to Stratford’s EMS Chief
Donna Best.
Don Czaplinski, co-owner of I’ll Take Manhattan, said the business would
donate a portion of its weekend sales to the effort.
Mayor James R. Miron is now trying to raise enough money to install the
defibrillators in all town buildings and schools, because there is no
such device in Town Hall and other municipal or school buildings.
Medtronic’s 13 percent drop biggest since ‘84
Fear that the market for implantable defibrillators might be shrinking,
makes the device stocks continue freefall.
Medtronic Inc.’s shares fell by $6.61 or 13 percent in New York Stock
Exchange composite trading. The decline was the biggest in 22 years.
Many companies such as Natick, Mass.-based Boston Scientific Corp.,
Little Canada-based St. Jude Medical suffered a great loss in stock
market.
According to Medtronic, U.S. sales of the devices declined 6 percent in
the quarter ended July 28. Surgeons are implanting fewer of the $30,000
defibrillators than last year.
Sales of implantable defibrillators have slowed from a 25 percent growth
rate in 2004 and 2005, partly because of the product recalls. Medtronic
and St. Jude. Boston Scientific and Guidant collectively have recalled
136,200 defibrillators since June 2005.
The slowdown in defibrillator sales suggests a larger problem and a
bigger market development challenge, according to Bruce Nudell, an
analyst with Sanford Bernstein & Co. in New York.
Provides sheriff’s department with fund for 3 defibrillators
Exelon Nuclear donated $4,000 to help Grundy County sheriff get three
additional defibrillators. Each device was approximately $1,300.
Automatic External Defibrillators send electric charge or shock to
restore normal heart rhythm, when the heartbeat is fatally fast due to
ventricular tachycardia or ventricular fibrillation.
Between 1999 and 2004, the sheriff’s department responded to ambulance
calls 332 times on the average, according to Grundy County Sheriff’s
Sergeant Jeff Cole. In 2001, on more than 70 percent occasions that the
department responded to, the sheriff’s deputy arrived first on the
scene.
The sheriff’s goal is to eventually own 18 AEDs to complete all squad
cars, 12 more than the department’s current six.
For now, they’ve equipped the cars they send out to the rural areas,
because often in those cases the sheriff’s department will beat the
ambulance service to the scene.
The sheriff’s office received the AEDs in June and they are already
available in the patrol unit.
U.S. Food and Drug Administration sent much less warning letters to drug
and medical device companies in 2005 from five years earlier, according
to New York Times.Seizures of mislabeled, defective, or dangerous
products fell 44 percent over the span. And enforcement actions over
medical devices fell 65 percent.
This was not because companies were in greater compliance with
government regulations, but because top FDA officials increasingly
overruled subordinates’ desire to enforce regulations, according to the
newspaper.
Dr. Sidney Wolfe, director of Public Citizen’s Health Research Group,
noted that the FDA receives some $380 million a year from drug companies
and device makers.
DeMarco Anderson-Turner, the fifth grader, drowned when celebrating the
end of the school year with classmates at a pool party.There were adult
chaperones and three lifeguards at the party at Portage Central Middle
School. But no adults noticed that Demarco was at the bottom of the
pool.
When the child was pulled from the water, he was unconscious and had no
pulse. Rescuers tried to use a rescue breathing mask to resuscitate him,
but it didn’t work.
Poolside rescuers looked for a defibrillator, but there wasn’t one in
the pool area. Michigan law doesn’t require defibrillators around pools.
Emergency medical personnel arrived, but by then it was too late.
The American Red Cross has recommended that automated external
defibrillators be widely distributed in schools, workplaces, malls,
airports, and any place where people gather and where someone might
suffer a sudden cardiac arrest.
Starting next year, the state of Michigan will mandate that health clubs
and gyms have defibrillators and staff will be trained to use them.
According to University of Michigan Health System, any place where a
defibrillator is used at least once every seven years makes sense. And
lawmakers should go a step further and require defibrillators at public
pools.
After much research, the West Liberty School Board decided to install
defibrillators for the school district during a June 19 meeting.The
defibrillators will be donated by the Lions Club, local Girl Scouts and
the West Liberty Fire Department. Each defibrillator will cost around
$1,500.
The equipment can be used during school hours and during after-school
activities, such as sporting events, meetings or musical performances.
They will not only benefit students, faculty and staff of West Liberty,
but also benefit any parent, grandparent or visitor on the school
grounds.
The idea was presented to the board two years ago by Mercy Hospital
representative Kelly Garvin. The board wanted time to research the
equipment before making the purchase. Liability and issues regarding the
difficulty of using the equipment were also raised.
Each school building, elementary school, middle school, high school and
administrative building will have a defibrillator available.
The board will also decide where it makes the most sense to place the
defibrillators within the schools.
Heart attack - During strenuous training in May, the officer went into
cardiac arrestDefibrillator saved Lt. Michael Shults’ life, the official
of the Multnomah County Sheriff’s office.
On May 21, Shults was at the end of a challenging, two-week Oregon
Marine Board course for public safety officials at Camp Rilea. The
stress of the exercise and a blockage in an artery near his heart had
sent him into cardiac arrest.
Shults was lucky that day. A defibrillator was nearby, and several
paramedics were part of the class. He was shocked back to life and
returned to work last week.
Sudden cardiac arrest is like an electrical storm in the heart, and the
machine delivers a shock that’s like hitting control-alt-delete on a
computer, rebooting the heart, according to Shaun Lisenby, the district
manager of Philips Medical Systems, manufacturer of the Heart Start FRX
defibrillator.
Defibrillators have gotten smaller and smaller, they’ve also gotten
easier to use. Current models are made to stand up under rugged use.
Weighing about five pounds, the device has three buttons and a gentle
voice that can lead anyone through restarting a heart. “We’ve made it so
easy anyone can do it,” Lisenby said.
Gov. Jeb Bush has signed two new laws that will put heart defibrillators
in most of Florida’s 159 state parks. The laws increase chances that a
life-saving device will be within reach if park visitors and young
athletes suffer a cardiac arrest.
The new laws in Florida follow the death last year of Matthew Miulli, a
Tampa high school baseball player. Miulli died of cardiac arrest during
a preseason practice. He might have been saved if a defibrillator had
been nearby.
The resulting law, the Gordon & Miulli Act, is named for Miulli and a
South Florida teen who also died. It allows nonprofit groups like Little
League baseball and community football teams to apply for grant money
from the state and from county commissioners in each county.
More than 200,000 Americans die each year of cardiac arrest. But up to
50,000 deaths — one in four — could be prevented if a defibrillator was
immediately available, according to the American Red Cross.
Small portable defibrillators can shock a heart back into normal rhythm.
They have been put in offices, airplanes and public buildings across the
nation for years. Advocates now want to place them in as many places as
possible, because they boost survival rates by 50 percent if used
quickly.
Automated external defibrillators are dropping in price, however, many
local school officials, especially in small counties, say they can’t
afford the costs. But in the wake of Miulli’s death, the Florida High
School Athletic Association last year made it mandatory for every school
in the state to have defibrillators at all district, state and regional
sports events.
|