Sorensen E R, Manna D, McCourt K
Department of Nursing, Jersey Shore Medical Center, Neptune.
Heart Lung. 1994 Nov-Dec;23(6):487-92.
To replicate a previous study that described the incidence and characteristics of patients after coronary artery bypass graft surgery who required the use of epicardial pacing wires and to explore the reasons for epicardial pacing wire use in this patient population.
Ex post facto descriptive correlational.
Cardiothoracic intensive care and step down units of a 500-bed medical center.
Convenience sample of 196 patients after coronary artery bypass graft surgery, 165 who did not use the epicardial pacing wires and 31 who used the epicardial pacing wires to augment cardiac output, diagnose dysrhythmias, suppress dysrhythmias, or treat heart block. Patients receiving other surgical techniques in combination with coronary artery bypass graft surgery were not included.
Recording of demographic and clinical data for all of the sample population, with additional data collected when the epicardial pacing wires were used.
Independent t test and chi-square analysis were used to determine significance between the means and frequencies in the variables of the patients who used the epicardial pacing wires and those who did not. The significance level was set at 0.05.
There were no statistically significant differences between the groups in terms of age or previous or recent myocardial infarction, which was opposite of the replicated study's findings. A statistically significant difference (p < 0.001) was found between the groups for the use of inotropic support, which was also opposite of the findings of that study. The group requiring epicardial pacing wire utilization demonstrated a greater need for diuretics in the preoperative phase than those who did not (p < 0.01), as well as a higher use of digitalis therapy before surgery (p < 0.01). Additionally, those who were paced experienced a greater cardiac output (p = 0.013) and cardiac index (p = 0.018) after pacing was initiated.
The variation in findings between this study and the one replicated may be the result of variations in the patient populations, treatment practices, or preoperative condition. Replication of this study at a future date may reveal variables not identified here.
重复之前一项描述冠状动脉搭桥手术后需要使用心外膜起搏导线的患者的发病率及特征的研究，并探究该患者群体使用心外膜起搏导线的原因。
事后描述性相关性研究。
一家拥有500张床位的医疗中心的心胸重症监护病房及逐步降级病房。
冠状动脉搭桥手术后196例患者的便利样本，其中165例未使用心外膜起搏导线，31例使用心外膜起搏导线以增加心输出量、诊断心律失常、抑制心律失常或治疗心脏传导阻滞。接受冠状动脉搭桥手术联合其他手术技术的患者未纳入。
记录所有样本人群的人口统计学和临床数据，在使用心外膜起搏导线时收集额外数据。
采用独立t检验和卡方分析来确定使用心外膜起搏导线的患者与未使用心外膜起搏导线的患者在变量均值和频率之间的差异是否具有统计学意义。显著性水平设定为0.05。
两组在年龄、既往或近期心肌梗死方面无统计学显著差异，这与重复研究的结果相反。两组在使用正性肌力支持方面存在统计学显著差异（p < 0.001），这也与该研究的结果相反。需要使用心外膜起搏导线的组在术前阶段比未使用的组对利尿剂的需求更大（p < 0.01），术前使用洋地黄治疗的比例也更高（p < 0.01）。此外，起搏患者在开始起搏后心输出量（p = 0.013）和心脏指数（p = 0.018）更高。
本研究与重复研究结果的差异可能是患者群体、治疗方法或术前状况不同所致。未来重复本研究可能会揭示此处未识别的变量。
