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A Woman Was Poisoned By Carbon Monoxide In Her Home

Her Case Report Gives Her Age As 75

It Says The Poisoning Met No Severity Criteria At First

Memory Problems And Confusion Followed And She Was Hospitalized

Then She Improved And Was Able To Return Home

Her Condition Got Worse Again 3 Weeks After The Poisoning

She Was Confused And Had Trouble Walking And Was Not Speaking

Those Symptoms Got Her Admitted To An Emergency Department

She Also Had An Inflammatory Syndrome

The Main Hypothesis On Arrival Was Infectious Meningoencephalitis

So Doctors First Suspected An Infection Of The Brain

She Was Put On Acyclovir And Antibiotics

After A Short Stay In Intensive Care Her Condition Did Not Improve

Doctors Then Reassessed Her Case History And Imaging Studies

Post Interval Syndrome From The Poisoning Seemed Most Likely

The Authors Call Post Interval Syndrome Poorly Known To Clinicians

It Shows Up As Brain And Mental Disorders After Initial Improvement

She Showed No Neurological Improvement After 6 Months

The Same Report Calls The Outlook For This Syndrome Poor

It Adds That No Treatment Has Been Proven Effective To Date

Other Reports Explain Why Poisoning Is Easy To Miss

A Report On Hurricane Katrina Poisonings Gives One Reason

Its Editorial Note Calls The Common Symptoms Nonspecific

Headache And Dizziness And Weakness Are Among Its Examples

Nausea And Vomiting And Chest Pain And Confusion Are Others

The Note Adds That Many Poisoned People Mistake Their Symptoms For Flu

A Florida Hurricane Report Counted Symptoms In Hospital Treated Cases

Headache Was Reported Most Often At 80.0 Percent

Nausea At 51.5 Percent And Dizziness At 50.9 Percent Came Next

Vomiting Followed At 31.5 Percent

A Comment In A Separate Case Report Describes The Range Of Signs

It Says Signs And Symptoms Depend On The Exposure

They Range From A Nonspecific Viral Illness To Heart Rhythm Problems

At The Far End Are Coma And Death

The Comment Says The Classic Signs Rarely Occur

Those Are Cherry Red Lips And Bluish Skin And Bleeding In The Retina

Some Patients May Come In For Imaging Studies

They May Have Lost Consciousness For No Clear Reason

Others May Have Neurological Problems

In Those Cases Carbon Monoxide Is Not Suspected At First

The Same Comment Says Diagnosis Is By Measuring Carboxyhemoglobin

Carboxyhemoglobin Forms When Carbon Monoxide Binds To Hemoglobin

Yet The Comment Notes That Level Matches Symptom Severity Poorly

Another Case Report Makes A Similar Point

It Says The Level On Admission Does Not Always Match Clinical Findings

Nor Does It Always Match The Prognosis

A Randomized Study Measured Delayed Brain Problems After Poisoning

It Enrolled Patients With Mild To Moderate Poisoning

None Had Lost Consciousness Or Had An Unstable Heart

All Of Them Arrived For Care Within 6 Hours

A Patient Counted Only If New Symptoms Appeared After Oxygen Treatment

The Patient Also Had To Do Worse On At Least One Brain Function Test

Its Authors Concluded That These Problems Cannot Be Predicted

Neither Clinical History Nor Carbon Monoxide Level Could Predict Them

That Conclusion Comes From Mild To Moderate Cases Only

The Report On The Woman Ends With A Lesson For Doctors

Its Authors Say Post Interval Syndrome Should Be Considered

That Means Anyone With Neurological Disorders After A Symptom Free Gap