[Correlation between coronary artery bypass graft surgery and hearing threshold changes]

Sensorineural hearing loss [SNHL] is a probable complication of coronary artery bypass graft [CABG] Surgery, that may be due to embolism, perfusion failure and consumption of ototoxic drugs. Since the incidence of SNHL after CABG is different according to the various reports, the present study was designed to study hearing threshold change after CABG surgery. In this cross-sectional study, 65 patients candidated for CABG surgery were selected by convenient sampling. One week before and two weeks after the surgery, all patients were examined by E.N.T specialist, and underwent PTA and impedance test. Other information including history of previous diseases were collected too. Distribution and central indices were used for description of results and Wilcoxon test was used for comparison of pre- and post- operative hearing threshold. Comparison of Pre -and Post - operative audiometry results showed no significant change in hearing for all frequencies and in both ears. Hearing threshold difference in the right ear at 4000HZ and in the left ear at 2000HZ was meaningful [P=0.027, P=0.004 respectively]. Although hearing threshold differences at all frequencies and in both ears were greater in men rather than women, the meaningful difference was only for the frequency of 1000HZ in the right ear [P=0.03] and 4000HZ in the left ear [P=0.034]. Although, hearing loss can occur after nonotologic surgeries, the incidence is very low and this can be due to the improvement in surgical and anesthesia techniques. Meanwhile, hearing threshold change in some frequencies may be sex-dependent

Correlation between preoperative demographic and physiologic variables and extubation time after coronary artery bypass [CABG]

Heart disease is one of the most common disorders in the worldwide and Coronary Artery ByPass Graft [CABG] is importand surgical procedure in the patients. In this regard, one of the intervention is, extubation process in the patients. To recognize the related variables on duration of extubation and the expected time of quality nursing care, the aim of this study was to determine correlation of the variable and predicting extubation time to improve quality of nursing care. In other words, this study was conducted to determine any relationship between preoperative factors such as demographic and physiologic variables with extubation time after CABG. This study was a descriptive design; with census sampling method. The sample size was 150 patients who were undertaken CABG surgery. For data gathering, patients records were used and in some cases, when it was necessary to collect more information, the data were gathered from patients' discharge plan. The results showed that 72.6% of the subjects were males and the remaining were females. Mean and standard deviation of age were 56.6 [ +/- 9.93] years. Most of the subjects [76.7%] had stenosis in three vessels. With regard to the different study variables, the mean of extubation time was less than or equal 12 hours, in younger patients [<50 years] compared to the other age groups [P0.01]. Also Mann whitney U test showed that extubation time in balloon pump users were more than others [P<0.05] and the extubation time was longer than the other groups. Findings of this study, indicate that older age groups with using balloon pump need more attention in extubation, and early extubation can lead to early discharge and may decrease hospitalzation costs