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Reliability of Cardiac Tests?
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MandyCake posted:
Hi.

I have had a chest xray that showed my heart was enlarged, followed by a normal xray.

I have had stress tests/echo's which I am told are normal, albiet "difficult study, assume normal.

My EKG's all come back abnormal stating anterior ischema and anterior infarction, can not rule out, age undetermined.

My Cardiologist states my heart is 100% perfect. So my question is, with all of these abnormal results, how reliable are these tests, really?
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cardiostarusa1 responded:
Hi:

"So my question is, with all of these abnormal results, how reliable are these tests, really?"

Good question.

Unfortunately, no diagnostic test/imaging modality is 100% perfect, as they all have their inherent strengths and weaknesses.

EXAMPLES:

CHEST X-RAY

There is a medical term known as the cardiothoracic ratio (CTR), which is a measurement on a chest X-ray (CXR) of the width of the heart divided by the width of the chest.

Typically, a CTR greater than 50% is suggestive of an enlarged or dilated heart. Noteworthy though, in some cases, a heart may/can be greater than 50% of the cardiothoracic ratio and still be considered a normal heart.


ELECTROCARDIOGRAM (ECG/EKG)


HeartSite

It is important to remember that EKGs are not 100% accurate. Normal recordings can be obtained in patients with significant heart disease , or some "abnormalities" may exist in the presence of a normal heart.


http://www.heartsite.com/html/ekg.html


ECHOCARDIOGRAM

Echocardiography is prone to a certain margin of error due to the nature of soundwaves, and noteworthy, sometimes, the results can be misread or misinterpreted as well as the results can be technically difficult or limited (image quality suffers), inconclusive or wrong due to an individual's body habitus (build, construction), anatomical abnormalites, obesity, operator technique or error as well as faulty equipment or not being adjusted/working correctly.

STRESS TEST

While the treadmill-only stress test has some accuracy limitations, adding nuclear imaging, gated-SPECT (synced to an electrocardiogram/ECG), with technetium-based radioisotopes Cardiolite or Myoview, improves the diagnostic accuracy substantially by aiding in differentiating attenuation artifacts, if/when that occurs.

An artifact is a false image (as reported from breast attenuation, diaphragmatic attenuation, and other sources of artifacts), which causes a false-positive (F-P) result'finding, indicating a problem when there actually isn't one.

"My cardiologist states my heart is 100% perfect"

Well, if for any reason you are skeptical of this, do feel free to seek a second professional medical opinion, of course, bringing ALL your test results with you.

Best of luck down the road of life.

Take care,

CardioStar*

WebMD member (since 8/99)

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Learn about the HEART

WebMD

The Heart: (Human Anatomy) Pictures, Definition, Location in the Body and Heart Problems

http://www.webmd.com/heart/picture-of-the-heart


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Quote!

"Be a questioning patient. TALK to your DOCTOR and ASK QUESTIONS. Studies show that patients who ask the most questions, and are most assertive, get the best results. Be vigilant and speak up!"

- Charles Inlander, People's Medical Society

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It's your future......be there.

. .

WebMD/WebMD forums does not provide medical, diagnosis or treatment.
 
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MandyCake replied to cardiostarusa1's response:
Thank You for responding.
 
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cardiostarusa1 replied to MandyCake's response:
You're welcome.

Take good care,

CardioStar*

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It's your future......be there.


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