Tag Archives: cause mapping

Root Cause

Pregnant Patient Dies After Wrong Organ is Removed

By ThinkReliability Staff

A series of errors resulted of the death of a young mother in Romford of the United Kingdom on November 11, 2011.  Details of the patient’s condition and care provided by a  local hospital during a bout of appendicitis were recently released.  We can look at the causes that led to her death – and the death of her unborn baby – in a Cause Map, or visual root cause analysis.

With a complex issue taking place over several days like this one, it can be helpful to develop a timeline to aid in understanding.  In October, 2011, the 5-months pregnant patient entered the hospital and was diagnosed with appendicitis.  Surgery to remove her appendix occurred on October 23rd.  On the 29th, the patient was discharged from the hospital.  The pathology results became available on October 31st. These tests indicated that it was not the appendix that had been removed, but an ovary.  However, the results were not read by any hospital staff at this time.

The patient returned to the hospital on November 7, still in pain.  On the 9th, she suffered a miscarriage, at which point the pathology tests were read.  The patient underwent surgery to remove septic fluid from the diseased appendix, which had not been removed.  Two days later, on the 11th, the patient underwent a second surgery to remove her appendix, and died during the operation.

Before beginning an analysis it’s important to determine which organizational goals were impacted as a result of any issue being analyzed.  In this case, the patient death and miscarriage are both impacts to the patient safety goal.  (Both the mom and baby can be considered patients.)  As a result of the issues related to the patient’s death, eight hospital staff are being investigated, an impact on the hospital’s employees.  The death of a patient related to the wrong procedure being performed – in this case, the wrong organ was removed during her appendectomy – is a “Never event”, which is an impact to the compliance goal.  The Hospital Trust has accepted liability for her death, an impact to the organization.  The wrong organ being removed is an impact to the patient services goal. Additional required surgeries are an impact to the labor goal.

To perform our root cause analysis, we begin with an impacted goal and ask “Why” questions.  In this case, the patient death was due to multiple organ failure.  The multiple organ failure occurred because the patient had sepsis, and the sepsis was not immediately recognized.  (Although it appears that nothing was done to deal with sepsis until two days after the patient returned to the hospital, details on what was done have not been released.)  The sepsis resulted from the patient having appendicitis, and the appendix not being removed for 19 days.  Why was the appendix not removed for 19 days?  Instead of removing the appendix during surgery, the patient’s ovary was removed.  The results of the pathology report (which would have identified that the organ sent was not an appendix) was not read when available.  It is also not clear what the process was for reading these reports at the hospital, and how that process is being fixed.  It is known that the pathologist did not do any special reporting of the adverse results.

Now we get to the question, why was the wrong organ removed in the first place?  The surgeons were attempting to remove the appendix, which was inflamed as the patient was suffering from appendicitis.  Because they were performing open surgery, rather than laparoscopic, and the uterus was in the way of the appendix (due to the pregnancy), the surgery was being performed by feel, rather than sight.  (As you can imagine, this makes the surgery more difficult.)  During the surgery by feel, the ovary was mistaken for the appendix.  The ovary was possibly inflamed, due to the pregnancy, but another important issue is that the surgery was performed with overall inadequate expertise – specifically by trainees with no senior medical staff present.  (Senior medical staff were not required to be present, but due to the admitted difficulty of this type of surgery, that may have been a good move.)

As with many medical mishaps, any number of staff members could have improved the patient’s outcome.  Specifically, though the pathologist was only tangentially involved in the patient’s case, had she or he called the patient’s team immediately upon noticing that what was labeled an appendix was actually an ovary, the patient’s (and baby’s) life would likely have been saved.  Patient safety depends on everyone.

To view the Outline and Cause Map, please click “Download PDF” above.

Root Cause

Promising New Cancer Drugs Use the Immune System

By Kim Smiley

A promising and potentially powerful new type of cancer treatment uses the immune system to fight tumors.   The drugs are still in early testing, but reports are that they shrunk tumors significantly in 15 to 50 percent of patients.  Patients with different types of cancer have also responded, which is an encouraging sign that the new treatment may have wide spread applications.

A Cause Map, or visual root cause analysis, can help illustrate how these new drugs work and explain why researchers and the companies developing them are so excited about them.  It may seem strange to use a root cause analysis technique on something positive, but it can be just as beneficial to understand why things are going well as it is investigate when problems crop up.  If you understand why a success occurred, the information may be used to reproduce it.   Building a “success” Cause Map is the same as any other Cause Map.  You start by identifying the impacted goals and then ask “why” questions.

In this example, the safety goal was impacted because the new type of cancer treatment shows promise, and the economic goal was impacted because the stock for the companies developing the new cancer drugs rose.   The new cancer treatment being developed shows promise because patients are responding to it and it is completely different from anything being used today.  The new immunotherapy treatments use the body’s own defenses, the immune system, to fight cancer.

You may wonder why drugs are needed at all if the immune system has the ability to fight cancer.  The answer lies in a  cancer tumor’s ability to hide from the T cells, the part of the immune system that detects bacteria and other “invaders”.  Tumors produce a protein on their surface that prevents T cells from detecting them so the immune system never even knows they are there.  A very simplified explanation is that the new drugs block the protein that hides tumors and allow T cells to detect them.   Once detected, the immune system will attack the cancer.

If immunotherapy is successfully developed, it would give doctors more options in treating cancer, especially those that don’t respond to the conventional treatments.  So far the side effects have also been minimal, far less than what is generally seen with chemotherapy and radiation treatments.

Much more research is needed before this type of drug is widely available, but the findings so far are positive enough to increase stock prices and excite experts in the field.   I have my fingers crossed that the end result is everything researchers are dreaming it will be.

Root Cause

Lack of Care After Overdose Led to Patient Death

by ThinkReliability Staff


An inquest into the death of a patient in a Milton Keynes hospital was completed on May 17, 2013 by the local coroner.  The coroner found that the staff failed to take and report appropriate observations and render effective treatment.  Diagramming the cause-and-effect relationships identified in the inquest in a visual root cause analysis, or Cause Map, allows identification of lessons learned and possible solutions to reduce the risk of this type of incident happening again.

We begin with the impacts to the goals.  In this case, the patient safety goal is impacted due to the patient death.   It was suggested that nursing shortages may have been related to the issues that occurred.  If this is the case, the shortages would impact employees.  The inquest that resulted due to the patient death can be considered an impact to the compliance and organization goals.  Last but not least, the insufficient patient treatment is an impact to the patient services goal.

Beginning with these impacted goals, we can ask Why questions to determine the cause-and-effect relationships that resulted in the patient death.  In this case, the patient death was due to respiratory arrest caused by an obstructed airway.  The patient being placed on her back while unconscious (though sources differ on whether the patient was placed on her back or her side) due to a drug overdose.   The patient overdose was due to a self-administered overdose and not being administered the antidote for the drugs on which she had overdosed.

The patient was not given an antidote for the drugs on which she overdosed.  The family of the patient, who had a history of mental illness and frequented the hospital, believes that the staff believed she was faking her symptoms.

Through the patient’s eleven hours within the hospital’s Accident & Emergency (A&E) Department, only 2 formal observations were recorded.  One set of observations was recorded on a glove, which was later lost.  Abnormal results from these observations were not passed along from the healthcare aid who was responsible for the patient, likely due to nursing shortages.

Once all of the causes related to the incident have been recorded within the Cause Map, solutions can be brainstormed and recommended for implementation.  The coroner involved in the case has requested the Secretary of State for Health implement changes that would require seriously ill patients to be observed by nurses rather than healthcare assistants. The hospital has stated that they “have conducted an investigation to ensure lessons are learned” and “will be continuing to improve our service in regard to emergency patients”.  The hospital has commissioned training for their healthcare assistances to improve their skills.

To view the Outline and Cause Map, please click “Download PDF” above.

Root Cause

11 Patients Killed in Nursing Home Fire

by ThinkReliability Staff

A fire broke out in the early morning hours of November 18, 2011 at a residential aged care facility in Sydney, Australia.  At least 11 residents died as a direct result of the fire and nearly 100 were evacuated.    A nurse was been charged with 11 counts of murder as the fire is believed to be a result of arson. The nurse pleaded guilty to all 11 counts on May 27, 2013. (There have been other resident deaths but due to their age and health, it wasn’t clear if the deaths were a direct result of the fire.)

The cause of the fire initiation resulting in the deaths of residents, evacuation and severe damage to the nursing home facility is believed to have been arson.   The reasons for the arson are unclear and may never be fully understood.  However, there is still value in analyzing the event to determine if there are any other solutions that could reduce the risk of patient death in the future, at this facility or at others.

We can perform a root cause analysis in the highly visual, intuitive form of Cause Mapping to understand the issues that led to the tragedy.  We begin the analysis with the “What, When and Where” of the event, captured in a problem outline.  Additionally, we capture the impacts to an organization’s goals.   In this case, the patient safety goal was impacted due to the deaths.  There was an impact to employees, as a nurse at the facility has pleaded guiltily to murder.  Patient services were impacted due to the evacuation of the nearly 100 residents at the facility. The severe damage to the site resulted in the construction of a new facility, which cost $25 million.  (The cost of the new facility cannot all be attributed to the fire, as the new facility is much larger and has been modernized.)  Last but not least, the labor goal was impacted due to the incredibly heroic rescue efforts by the staff, firefighters and other rescue personnel, who were honored for their efforts.

Capturing the  frequency of similar issues can help provide perspective on  the magnitude of nation and world-wide issues.  I was unable to find data on the prevalence of nursing home fires in Australia, but there are more than 2,000 nursing home structure fires in the United States every year.  There have been a number of fatal nursing home fires in Australia over the last several years, so this is obviously a concern for the nation.

Once we have determined the impacts to the goals, we can ask “Why” questions to determine the causes that resulted in those impacts.  In this case, the resident deaths were due to smoke inhalation and complications from smoke inhalation as the result of a fire that spread through the facility.  The fire initiation, as discussed above, is believed to be due to arson.  However, it is believed that staffing levels and lack of an automatic sprinkler system were related to the spread of the fire, speed of the evacuation and the number of deaths.

Studies after the event showed how critical sprinklers can be to slow the spread of a fire.  On January 1, 2013, the government of New South Wales passed a law requiring installation of automatic sprinkler systems in all residential aged care facilities prior to January 1, 2016.  It is hoped that the presence of an automated sprinkler would slow or prevent the spread of a fire, resulting in fewer resident deaths.

To view the root cause analysis investigation of the fatal fire, please click “Download PDF” above.

Root Cause

Concern About a Resurgence of Black Lung Disease

By Kim Smiley 

Did you know that black lung disease has killed 70,000 coal miners since 1970?  Despite regulations designed to protect them, modern coal miners still face very real danger from coal dust.  Changes to the mining industry seem to be exacerbating this long standing issue.

Black lung disease, as coal workers’ pneumoconiosis is colloquially known, is caused by inhalation of coal dust, but there is more to the issue that needs to be understood.  The problem of miners suffering from black lung disease can be analyzed by building a Cause Map, a visual root cause analysis.  Cause Maps lay out the different causes that contribute to an issue visually to illustrate the cause-and-effect relationships.   (To view a high level Cause Map of this issue, click on “Download PDF” above.)

Coal dust is dangerous because it accumulates in the lungs and can cause long-term lung damage and breathing difficulties.  It is irreversible and there is no proven effective treatment.  Death can occur in severe cases.  The only option to fight this disease is prevention.

Black lung disease has a long history and concern about it first came to head in the 1960s.  A strike by 40,000 West Virginia coal miners pushed passage of the Federal Coal Mine Health and Safety Act of 1969.  This legislation limited coal dust exposure to 2 milligrams per cubic meter of air, which was significantly less than most miners were being exposed to at that time.  At first it seemed that the limits were effective in dramatically limiting black lung disease, but some are now worried about a resurgence of the disease.

Some speculate that changes in the mining industry are putting miners at greater risk for black lung disease.  The more dust that miners inhale, the greater the health risk and miners are both working longer hours and using equipment that potentially creates more dust.   The average workweek grew 11 hours since the 1970s which means miners are potentially exposed to dust for hundreds of more hours each year.  Technological advances have resulted in mining technology that is more powerful and can cut through coal faster, which can result in more dust.  The amount of coal produced per hour of work has nearly tripled since the 1970s.  These changes make it more challenging to prevent inhalation of dangerous levels of coal dust.  Increase in demand as well as the rising price of coal has driven these changes because it’s profitable to mine coal as quickly as possible.  Miners are also willing to work in the evolving conditions because mining provides a better living than other jobs available.

One of the most alarming pieces of evidence that cases of black lung may be increasing came from autopsies of the 29 miners killed in the blast at the Upper Big Branch mine in 2010.  The medical examiner was able to test tissue from 24 of the victims’ lungs and he found that 71% of those tested had black lung disease, a truly distressing percentage.  Some of the miners were relatively young and had a limited amount of time on the job.

There is no clear agreement on the best way to prevent black lung disease.  People are still trying to bound the problem and understand how significant the issue is.  But working to understand the problem is always the best first step to trying to solve it.

Root Cause

Health Risks to Young Athletes

By Kim Smiley

Deaths and serious injuries of young athletes make headlines every year.  So how do we ensure that participation in sports is as safe as possible?  The first step is to determine what is causing the deaths and understanding the factors involved.

The serious health risks to young athletes can be analyzed by building a Cause Map, an intuitive format for performing a root cause analysis.  A Cause Map visually lays out all the causes that contribute to an issue to show the cause-and-effect relationships to help illustrate the problem.  According to experts, some of the serious health threats to young athletes are sudden cardiac arrest, heat stroke and concussions.

The potential for concussions, especially in the more physical contact sports, has been getting a lot of attention in the media lately, but the most common cause of death of young athletes is sudden cardiac arrest.  Most cases of sudden cardiac arrest are caused by pre-existing heart conditions and the heart breaking part is that most of these are detectable and treatable.   Most of the heart conditions that cause sudden, unexpected death have few symptoms and can’t be found by a typical sports physical done in the US.  About two-thirds of the dangerous heart defects could be found by an electrocardiogram or EKG test, but these are not routinely done in the US.  The main factor preventing EKGs is the cost, which is not always covered by insurance.  Sudden cardiac arrest is also a risk that many people don’t know a lot about.

Concussions are also a risk for athletes of any age.  Concussions can have long term health consequences and occur when brain cells are damaged.  Concussions are mainly caused by impact to the head, but can also be caused by sudden jolts to the body that cause the brain to hit the inside of the skull.  Impacts during contact sports are a well-known cause of concussions, but typical sports activities like heading a soccer ball can also cause concussions.  Wearing the appropriate safety gear can help prevent concussions.  The rules of some sports also limit the more dangerous plays like helmet to helmet tackles in football.

Another significant risk to young athletes is heat stroke.  Heat stroke is usually preventable, but is still a significant risk and can cause death in extreme causes.  Heat stroke occurs when the internal temperature of the body rises above safe levels.  Young athletes are susceptible to heat stroke because many sports practice outside in hot weather. The typical modern, air conditioned life style increases the risk of heat stroke because athletes are generally less acclimated to the heat at the start of the season.  Athletes are most likely to suffer from heat stroke during the first few days of practice in hot temperatures. Gradually increasing workouts in warm temperatures to allow athletes to acclimate to the weather has been very effective at preventing heat stroke. For example, heat stroke rates dramatically decreased after the NCAA limited practice to three hours once a day for the first five days.

How quickly treatment is administered can also dramatically change the outcomes if an athlete is injured.  Quick action by trained personnel with the appropriate equipment can save lives.  According to a recent New Times Times article, only about 40 percent of high schools in the United States have a certified athletic trainer on staff and only about 70 percent have an automatic external defibrillator (AED).  AEDs are important because they can improve the chance for survival after sudden cardiac arrest by 60 percent or more.

So what is the best way to keep our young athletes safe?  This is a matter of lively debate.  Some people believe that the right answer is to require EKGs during pre-participation physicals, but the cost of performing EKGs on the 7.7 million high school athletes in the US is not trivial.  There is also the issue that EKGs, like most diagnostic tests, are not perfect and produce some false positives that would require more testing that raises costs.  Some believe the money could be better spent by hiring more trainers and buying more AEDs.  The answers aren’t simple, but the better we understand the problem the more informed the decisions will be.

Root Cause

Mom’s Saliva May Boost Infants’ Immune Systems

By Kim Smiley

A recent study found that “cleaning” a baby’s pacifier by sucking on it may actually have some lasting health benefits.  Researchers determined that babies given pacifiers exposed to their parents’ saliva developed fewer allergies.  It’s still not clear whether the benefits come from the actual oral cleaning of the pacifier or if this was just a marker of parents who had a more laid back approach to cleanliness, but scientists are finding increasing evidence that some exposure to more microbes early in life results in fewer allergies.

A Cause Map, a visual format for performing a root cause analysis, can be used to illustrate this issue.  A Cause Map intuitively shows the causes that contributed to an issue as well as the cause-and-effect relationships between them.  In this example, researchers found that infants whose parents cleaned their pacifiers by sucking on them, rather than by boiling or rinsing with tap water, had lower rates of eczema, fewer signs of asthma and smaller amounts of a type of white blood cell that rises in response to allergies.  The key seems to be that saliva contains traces of the parents’ gut microflora.  The infant’s immune system is stimulated by this exposure to their parents’ microflora and this seems to help prevent allergies, which are caused by the immune system responding to harmless inhaled or ingested proteins.  The study also found that children who are delivered vaginally develop fewer allergies than those who are born via cesarean, which limits exposure to bacteria during birth.

These findings are important because the percentage of the population in industrialized nations suffering from allergies has risen rapidly in the 20th century.  Currently, about a third of the children in affluent countries are affected by allergies.  Studies, such as this one, are being done to try and determine what is causing the increase in allergies but the causes are not definitively known yet.  Circumstantial evidence seems to point to lack of exposure to microbes in early childhood as a risk factor.  This study was relatively small and more research on a larger scale will need to be done, but it is beginning to seem that children who get a little dirty and put a few questionable things in their mouths actually benefit from the exposure.

So if you had a mom who cleaned stuff (and you…) with her spit, you have one more reason to thank her this Mother’s Day.  Or if you were that type of mom you have one less reason to feel guilty.

Check out our previous blog – Amish have few allergies

Root Cause

Study Finds that Fukushima Fallout is Affecting Babies in US

By Kim Smiley

A recent study found that babies born on the West Coast of the United States shortly after the Fukushima nuclear reactor meltdown have a higher rate of congenital hypothyroidism than those born a year earlier.  Thyroid issues have long been known to be associated with exposure to radiation and this finding feeds worries about the long term and long distance impact of the reactor disaster.

This issue can be analyzed by building a Cause Map, a visual root cause analysis, which intuitively lays out all the causes that contributed to an issue.  A Cause Map is built by asking “why” questions and adding the answers to the Cause Map to show the cause-and-effect relationships.

Why has the rate of congenital hypothyroidism increased?  This happened because the infants had radioactive iodine in their thyroids and radioactive iodine may affect the functioning of the thyroid if ingested.  If the thyroid doesn’t function properly, it can’t make the necessary hormones for healthy development and both growth and development can be stunted. The impacts of radioactive iodine are predominantly seen in the thyroid because ingested iodine concentrates in the thyroid where it is used to produce hormones.  The body can’t distinguish between stable and radioactive isotopes of iodine and it will store whatever iodine is available so ingested radioactive iodine can be kept within the body long enough to cause damage.

In the cases of fetuses, the mother passes iodine to her baby.  If pregnant woman ingests radioactive iodine, some of it will likely end up in the thyroid of her baby who needs the iodine to develop properly.  In this example, pregnant women on the West Coast were exposed to significantly higher than normal levels of iodione-131 following the Fukushima meltdown. Iodione-131 is a fission product that is created in a nuclear reactor when atoms are split.  When the reactor containment failed, radioactive isotopes of iodine were released into the environment along with other fission products.  Winds carried some of the radiation across the Pacific Ocean. Iodine-131 concentrations in precipitation in the United States were up to 211 times above normal in the days following the accident.  Some of this radioactive iodine found its way into the food supply and was ingested by people, some of them pregnant women causing the increase in cases of congenital hypothyroidism.

The good news is that congenital hypothyroidism with can be treated if found early.  The bad news is that there may be more health issues from the Fukushima meltdown in places outside of Japan discovered in the future.  The reality is that more than two years after the event we still don’t know what all the impacts of the radiation will be, both in Japan which has obviously suffered the most and in other countries.

 

 

Root Cause

Successful Emergency Response to Boston Bombing

By ThinkReliability Staff

The successful activation of emergency plans allowed 8 hospitals in the Boston area to treat 144 trauma patients injured in the bombings that occurred April 15, 2013 near the finish line of the Boston Marathon.  Even with that heavy burden, these hospitals ensured the continued safety of patients and staff during a very unsure time, as well as assisting the police and Federal Bureau of Investigation (FBI) with the ongoing investigation.

While details on the bombings themselves are still being determined and disseminated, it’s apparent that emergency planning and preparedness processes within the area Boston hospitals were successful in allowing an ‘unprecedented’ response.  We can view the response to the bombings by the area hospitals in what we like to call a root cause “success” analysis.  After all, lessons can be learned not only from what didn’t go well, but also what did.  Hospitals around the country can learn from the response by the Boston area hospitals to this trauma.

When Massachusetts General asked hospital staff from Israel, who unfortunately see this kind of trauma on a far more regular basis, to give emergency response training they likely did not suspect their hospital to be the site of a horrific mass trauma like that experienced in Boston.  The hospital’s experience with war-style trauma was certainly extremely helpful in dealing with the aftermath of this kind of trauma, rarely seen outside of war zones.  As Dr. Ron Walls, the chairman of the Department of Emergency Medicine at Brigham and Women’s Hospital stated, “For many, many people in emergency medicine who are practicing domestically and not in the military, these are once-in-a-lifetime events.”

For once-in-a-lifetime events, facilities have to hope that the training and education they’ve provided to their staff, and the processes that they’ve developed for dealing with emergencies, can stand up to the tragedy.  In this case, these Boston hospitals (once they have time to take a breath, which may not be for a while), should give themselves a pat on the back for their amazing handling of a tragic event.  Hospitals elsewhere should take note and ensure that their emergency procedures will allow the same sort of successful response.

A pat on the back should also go out to the staff in the medical tent at the finish line, whose quick actions and extensive equipment allowed on-scene stabilization and quick transfer of the severely injured to the area hospitals.  Lastly, the many spectators who kept their cool and assisted on scene should also be commended.

To view the Outline and Cause Map, please click “Download PDF” above.  Or click here to learn more about the emergency procedures at Massachusetts General.

Root Cause

Lead Poisoning Still An Issue for US Children

by Kim Smiley

Lead poisoning has once again hit the news with scary headlines such as “Blood Lead Levels High In 535,000 Kids In The USA” and “Despite Big Progress, Many Kids Have High Lead Levels in Blood“.   But what do these articles actually mean in context?  What does “many kids” refer to and how alarmed should we be?

A tool like a Cause Map, a visual method for performing a root cause analysis, can be useful to analyze issues like this one.   The first step in the Cause Mapping process is to define the problem and that alone can help clarify an issue.   Part of defining the problem is to determine which overall organizational goals are being impacted by the problem.   In this example, it becomes clear that there are really two different, but related goals that need to be considered.  The most basic goal is the safety goal.  The safety goal is being impacted because children are still being negatively impacted by exposure to lead in the United States, despite decades of work to dramatically reduce lead in the environment.  The second issue is that 2.6% of children in the US have blood lead levels (BLLs)  higher than the levels set by the Center for Disease and Control (CDC), an impact to the regulatory goal.

It’s clear why exposure to lead remains a concern. Ingestion of lead is dangerous, especially to small children. High levels of lead in the body can have severe and immediate consequences such as coma, convulsions and even death.  Lower levels of lead have been shown to cause lower IQs, behavior issues, hearing problems and a number of problems in organs in the body.  Problems with lead exposure are well known and the use of lead has been dramatically reduced.  Use of lead in household paints, one of the most common sources of ingested lead, was banned in 1978.  However, paint is still one of the primary sources of lead contamination because many children live in houses built before 1978.  Paint chips containing lead can still be an issue, especially if an older house has loose paint or is undergoing a renovation.  Use of lead in gasoline, a common source of soil contamination, was phased out by the end of the 1980s.

The second issue of concern is that 2.6% of children have blood lead levels above the limit set by the CDC.  What does this mean?  If this problem is hitting headlines, are things getting worse?  One important piece of data is that the CDC lowered the limit for young children in 2012 to 5 µg/dL from 10 µg/dL.  Why was the limit lowered?  The limit was lowered because no amount of lead has been determined to be safe for young children and less lead is always better.  The new limit of 5 µg/dL was based on lead levels in the 2.5% of children with the highest levels.  It was a way to target the children most at risk and it marked a shift towards a more prevention-based approach.

Is it okay that 2.6% of children still have blood lead levels above the target?  Of course not.  Is there still work to do in preventing lead exposure?  Many people believe there is.  But the alarming headlines may not tell the whole story.  Here are some other facts that help put the issue of lead exposure in historical context: an estimated 88% of children aged 1 to 5 had blood lead levels at or above 10 mcg/dL from 1976 to 1980; from 1991-1994 it was 4.4% , from 1999-2002 it was 1.6% and it dropped to 0.8% in 2007-2010.    Lead exposure is a still an issue, but it’s an issue that has been drastically improved.

To view a Cause Map of this issue, click on “Download PDF” above.  For more information, click here to visit the CDC’s information page about lead.