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Blood Count May Count After Surgery

Red Blood Cell Count Before Surgery May Affect Postsurgery Risk After Age 65
WebMD Health News
Reviewed by Louise Chang, MD

June 12, 2007 -- Having a high or low red blood cell count before major surgery may affect postsurgery deaths in adults aged 65 and older.

That's according to a new study published in The Journal of the American Medical Association.

The study is based on the medical records of more than 310,000 U.S. veterans aged 65 and older.

Between 1997 and 2004, the veterans got major surgery that didn't involve their hearts. They had their red blood cell counts measured up to three months before their operations.

The researchers included Wen-Chih Wu, MD, of Brown University's medical school and Rhode Island's Providence Veterans Affairs Medical Center.

They found that veterans with abnormally high or low red blood cell counts before surgery were more likely to die or have a heart attack in the month after surgery.

The findings even applied to patients with mildly high or low red blood cell counts before surgery. Those with extremely high or low red blood cell counts were at greater risk.

Risk in Perspective

Before surgery, nearly 57% of the patients had normal red blood cell counts, almost 43% had low red blood cell counts (anemia), and less than 1% had high red blood cell counts (polycythemia).

The study shows that for every percentage point above or below the normal red blood cell count range before surgery, patients were 1.6% more likely to die in the 30 days after surgery.

But the study doesn't prove that abnormal red blood cell counts directly influenced patients' postsurgery deaths or heart attacks.

The researchers noticed that anemic patients tended to be older, to have do-not-resuscitate orders, and to have health problems including diabetes, heart disease, and kidney disease.

Patients with polycythemia were more likely to be smokers and to have conditions including chronic obstructive pulmonary disease (COPD), the researchers note.

Wu's team considered such factors in analyzing the data. Their findings held.

However, Wu's team notes that abnormal red blood cell counts may be a marker -- but not a cause -- of postsurgery risk.

Since the veterans were mainly white men, the findings may not apply to other groups of people aged 65 and older.

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