The effects of preoperative hypothyroidism after coronary artery bypass grafting are not well known. Thus, a study was performed to evaluate whether or not preoperatively diagnosed hypothyroidism has any influence to the postoperative complications or recovery.
Consecutive cases of isolated coronary artery bypass grafting performed between 1991 and 2005 were placed into the systematic database. 28 patients (13 male and 15 female, mean age of 67 ± 8), who had preoperative diagnosis of hypothyroidism, were identified. Their postoperative mortality, morbidity, length of stay was compared with control patients without diagnosis of hypothyroidism (2281 male and 638 female, mean age of 65 ± 10).
None of preoperative comorbidities such as hypertension, diabetes, smoking history, peripheral vascular disease, renal failure, history of stroke, preoperative left ventricular function, or nature of surgery, such as emergent surgery, redo sternotomy, off-pump bypass, number of bypass, bypass time, differs significantly. Postoperative intubation time (13 ± 15 hours in hypothyroid group vs. 10 ± 15 hours in control group, p = 0.12), ICU stay (2.8 ± 1.5 day vs. 2.4 ± 2.2 days, p = 0.16), postoperative hospital stay (17 ± 11 days vs. 15 ± 9 days, p = 0.63) were similar between two groups. There were no death, one permanent pacemaker (3.6%) for complete AV block, one postoperative congestive heart failure (3.6%), and two pneumoniae (7.1%) in hypothyroid group, which did not significantly differ from control group.
Presence of preoperative hypothyroidism will not affect postoperative outcomes.
Routine preoperative investigation of hypothyroidism before coronary artery bypass graft may not be necessary.
Hitoshi Hirose, No Financial Disclosure Information; No Product/Research Disclosure Information