JOURNAL ARTICLE
Relationship between venous and arterial carboxyhemoglobin levels in patients with suspected carbon monoxide poisoning.
Annals of Emergency Medicine 1995 April
STUDY OBJECTIVE: To test the hypothesis that venous carboxyhemoglobin (V-COHb) levels accurately predict arterial (A-COHb) levels.
DESIGN: Prospective comparison of A-COHb and V-COHb levels in patients with suspected carbon monoxide (CO) poisoning.
SETTING: Municipal hospital emergency department with contiguous multiplace hyperbaric chamber staffed 24 hours a day.
PARTICIPANTS: Unselected convenience sample of 61 adults with suspected CO toxicity.
INTERVENTION: Simultaneous sampling of arterial and venous blood.
RESULTS: Correlation between V-COHb and A-COHb showed an r value of .99 (95%CI, .99 to .99), and an r2 value of .98. Agreement between V-COHb and A-COHb levels was examined by use of a plot of arteriovenous differences against the mean of the two measurements. The mean arteriovenous difference was .15% COHb (95%CI, .13% to .45%), with 95% of the differences ranging from 2.4% COHb to -2.1% COHb.
CONCLUSION: Venous COHb levels predict arterial levels with a high degree of accuracy. Patients with suspected CO poisoning can be screened with the use of venous blood, without the need for arterial puncture.
DESIGN: Prospective comparison of A-COHb and V-COHb levels in patients with suspected carbon monoxide (CO) poisoning.
SETTING: Municipal hospital emergency department with contiguous multiplace hyperbaric chamber staffed 24 hours a day.
PARTICIPANTS: Unselected convenience sample of 61 adults with suspected CO toxicity.
INTERVENTION: Simultaneous sampling of arterial and venous blood.
RESULTS: Correlation between V-COHb and A-COHb showed an r value of .99 (95%CI, .99 to .99), and an r2 value of .98. Agreement between V-COHb and A-COHb levels was examined by use of a plot of arteriovenous differences against the mean of the two measurements. The mean arteriovenous difference was .15% COHb (95%CI, .13% to .45%), with 95% of the differences ranging from 2.4% COHb to -2.1% COHb.
CONCLUSION: Venous COHb levels predict arterial levels with a high degree of accuracy. Patients with suspected CO poisoning can be screened with the use of venous blood, without the need for arterial puncture.
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