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Ann Thorac Surg 2005;80:1563-1564
© 2005 The Society of Thoracic Surgeons

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Correspondence

Did the Global Myocardial Ischemia Produce an Influence On High-Frequency QRS Potentials?

Department of Cardiovascular Surgery, Yamato Tokushuukai Hospital, 4-4-12, Chuo, Yamato-shi, Kanagawa, 242-0021 Japan

(Email: y.terada{at}yth.or.jp).

To the Editor:

I was delighted to read the interesting article about high-frequency QRS potentials as a new marker of myocardial dysfunction after cardiac surgery [1]. I also thank you for citing my article in your comments [2].

There are several points to be discussed. First, the global myocardial ischemia may produce a great influence on the reduction of high-frequency QRS potential after surgery. It is easily expected that the longer the aortic cross-clamp time is the more frequently the postoperative myocardial dysfunction occurs. You might have possibly considered making a comparative study of the changes of the root-mean-square voltage (RMST) of the total QRS duration between patients with and without postoperative cardiac dysfunction in the same aortic cross-clamp time.

Second, I suggest that you consider revisiting the topic of patient selection. In your study, the types of cardiac surgery included coronary artery bypass grafting (CABG) and prosthetic valve replacement. Generally, coronary blood flow may increase after coronary revascularization. Is there any patient whose RMST values increased after bypass grafting? The mean aortic cross-clamp time of 119 minutes for group 4 in which patients showed the lowest values of RMST postoperatively was long and unusual for CABG. Disclosure of details concerning those patients may well be helpful.

Third, I am interested in high-frequency QRS potentials during and after localized myocardial ischemia. Do you have any statistical data concerning RMST in patients who underwent off-pump coronary artery bypass grafting?

	References

Top References

 

1. Matsushita S, Sakakibara Y, Imazuru T, et al. High-frequency QRS potentials as a marker of myocardial dysfunction after cardiac surgery Ann Thorac Surg 2004;77:1293-1297.[Abstract/Free Full Text]
2. Terada Y, Mitsui T, Matsushita S, et al. Influence of bypass grafting to the infarct artery on late potentials in coronary operations Ann Thorac Surg 1995;60:422-425.[Abstract/Free Full Text]

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				S. Matsushita and Y. Sakakibara Did the Global Myocardial Ischemia Produce an Influence On High-Frequency QRS Potentials: Reply Ann. Thorac. Surg., October 1, 2005; 80(4): 1564 - 1564. [Full Text] [PDF]

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Personal Folders Download to citation manager Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Terada, Y. Search for Related Content PubMed PubMed Citation Articles by Terada, Y. Related Collections Related Article