Summary
In view of the high case fatality rates of patients with chronic obstructive pulmonary
disease (COPD) who have pulmonary embolism (PE) we speculated that such patients might
benefit from vena cava filters. To test this hypothesis we assessed the database of
the Nationwide Inpatient Sample. From 1998–2009, 440,370 patients were hospitalised
with PE and COPD who were not in shock or ventilator-dependent and did not receive
thrombolytic therapy or pulmonary embolectomy. In-hospital all-cause case fatality
rate among those with filters was 5,890 of 68,800 (8.6%) (95% confidence interval
[CI] = 8.4–8.8) compared with 38,960 of 371,570 (10.5%) (95% CI = 10.4–10.6) (p<0.0001)
who did not receive filters. Case fatality rate was age-dependent. Only those who
were older than aged 50 years had a lower in-hospital all-cause case fatality rate
with filters. Among such patients, absolute risk reduction was 2.1% (95% CI = 1.9–2.3).
The greatest reduction of case fatality rate with vena cava filters was shown in patients
>aged 80 years, 11,720 of 81,600 (14.4%) compared with 1,570 of 17,220 (9.1%) (p<0.0001).
In conclusion, a somewhat lower in-hospital all-cause case fatality rate was shown
with vena filters in stable patients with PE >aged 50 years who also had COPD. The
benefit was greatest in elderly patients. The benefit in terms of a decreased case
fatality rate would seem to outweigh the risks of vena cava filters in such patients.
Keywords
Pulmonary embolism - venous thromboembolism - vena cava filters - chronic obstructive
pulmonary disease