|
|
||||||||
Ann Thorac Surg 1995;59:163-168
© 1995 The Society of Thoracic Surgeons
Division of Plastic and Reconstructive Surgery, University of Louisville, Louisville, Kentucky
Accepted for publication July 29, 1994.
| Abstract |
|---|
|
|
|---|
| Introduction |
|---|
|
|
|---|
There are two possible sources of collateral supply to the sternum after mobilization of the ITA. These are the posterior intercostal arteries, which anastomose with the intercostal branches of the ITA, and the thoracoacromial arteries, which anastomose (by their branches in the pectoralis major muscles and in the overlying soft tissue) with the perforating branches of the ITA. For the sternum to receive blood from these sources, blood vessel connections must exist that would let blood pass retrogradely along the intercostal or perforating branches of the ITA, then pass antegradely along its sternal branches.
The literature contains little information on the existence of such connections. Textbook accounts [9] of the relevant branches of the ITA describe them as being of three simple types: sternal, intercostal, or perforating. Each branch type is named and described as having only one destination. Connections between the three different branch types, or branches having a common trunk and serving more than one destination, are not described. Green [7], on the basis of direct surgical observation, has described ITA branches arising from the anterior aspect of the vessel that divide to supply both the sternum and the intercostal space. These branches, if ligated close enough to the ITA to preserve their point of division, would serve as conduits for collateral flow to the sternum.
In this article we describe a microdissection study on 10 fresh, injected cadaveric specimens to determine the existence, frequency, diameter, and location of connections between the anterior intercostal, perforating, and sternal branches of the ITA. Our study shows that such connections are abundant, that they take the form of shared branch origins, and that they lie directly in harm's way in the course of ITA bypass grafting.
| Material and Methods |
|---|
|
|
|---|
The specimen was placed in a bath of 2% potassium hydroxide at room temperature for 3 weeks; the bath was changed every 3 to 4 days. The specimen was then transferred to 50%, 70%, 100%, and again 100% glycerol, with 3-day intervals between transfers. This rendered the soft tissues almost transparent.
Using a Zeiss operating microscope (x4 to x25) and standard microsurgical instruments, a careful dissection was made of both internal thoracic arteries and all their branches, from the first to the sixth intercostal space. Each branch, and its branches, were followed to their destinations, and the destinations were recorded. A detailed vessel map was drawn for each specimen, and each completed dissection was photographed. Figure 1
indicates the appearance of a typical specimen upon completion of the dissection. Vessel diameters were measured at specific points, described below, by visual comparison with a set of steel rods ranging in diameter from 0.2 mm to 2.0 mm, in 0.2-mm increments. Distances between certain critical points, described below, were measured with calipers.
|
| Results |
|---|
|
|
|---|
|
|
|
|
After mobilization of the ITA, collateral blood flow could reach the sternum by way of an S/I ITA branch (Fig 4A
). For this to occur, the point of division of the S/I branch into its sternal and intercostal sub-branches must be protected from surgical damage. The length of the common trunk of the S/I branches ranged from 1 to 12 mm, with a mean of 4.1 mm. The distance was less than 5 mm in 67% of cases and less than 10 mm in 95% of cases.
|
The point of origin of the anterior sternal sub-branch is located more anteriorly within the thickness of the intercostal muscle and does not appear to be vulnerable to surgical damage.
Sternal/perforating branches could be damaged not only during ITA dissection, but also at wound closure by the passage of cerclage wires. The distance between the lateral edge of the sternum and the perforator component of an S/P branch ranged from 0 to 16 mm, with a mean of 5.4 mm. The distance was less than 5 mm in 44% of instances and less than 10 mm in 72% of instances.
PERSISTENT POSTERIOR INTERCOSTAL ARTERIES.
A small number of posterior intercostal arteries were found which passed all the way to the sternum without anastomosing with an ITA branch. In doing so, they passed close to the ITA and anterior to it. The proximity of a persistent posterior intercostal artery to the ITA makes it vulnerable. At the point where the vessels cross, the distance between the persistent posterior intercostal artery and the ITA ranged from 2 to 10 mm, with a mean of 4.5 mm. The distance was less than 5 mm in 59% of instances and less than 10 mm in 90% of instances.
Collective Observations Concerning Collateral Vessels and Their Distribution
The number of collateral vessels per hemisternum ranged from 3 to 12 with a mean of 5.8. The number of collateral vessels in each interspace ranged from 0 to 4 with a mean of 1.02. The number of collateral vessels varied as widely between the right and left sides of a specimen as it did between individual specimens.
The number of interspaces in each hemisternum in which there was no collateral vessel ranged from zero to four, with a mean of 1.9. In 5 of the 20 hemisternal specimens there were two adjacent interspaces that had no collateral vessel. In a further 2 specimens there were three adjacent interspaces with no collateral vessel.
The vertical distribution of the three types of collateral vessel is shown in Table 3
. There were many fewer collateral vessels in the lower three interspaces than in the upper three.
|
With the first technique 51% of all S/I branches and 67% of all S/P branches would cease to function as collateral vessels because they would be ligated beyond their point of division.
In the second technique 95% of all S/I branches and 84% of all S/P branches would cease to function as collateral vessels. In addition, 59% of persistent posterior intercostal vessels would be destroyed.
A determination also was made of the number of intercostal spaces that would be left without any collateral vessel using each technique. In this regard the effect of operation would be more serious for the posterior than for the anterior aspect of the sternum. This is because, in the case of S/P branches, the sub-branch to the posterior aspect of the sternum is prone to damage whereas the sub-branch to the anterior aspect is not.
Before the imagined operation the mean number of intercostal spaces having no collateral vessel was 1.9 per hemisternum. With the first technique, this number would rise to 2.2 on the anterior aspect and 3.6 on the posterior aspect. With the second technique, the number of interspaces having no collateral vessel would rise to 4.6 on the anterior aspect and to 5.1 on the posterior aspect.
| Comment |
|---|
|
|
|---|
Of the three types of collateral vessels that we identified only one, the S/I ITA branch, was described by Green [7]; Green's description of S/I branches was made on the basis of operative findings. Our account of these branches corresponds with Green's except that we find that they do not occur as regularly as Green states.
Arnold [10], in a study based on anteroposterior, two-dimensional arteriography, failed to identify any of the three types of collateral vessels that are readily apparent upon dissection of the cleared tissue. This attests to the limitations of two-dimensional arteriography. The radiologic shadow of the ITA would obscure, in each collateral vessel type, an essential anatomic feature. For S/I and S/P branches the essential feature is the common trunk of origin. For persistent posterior intercostal vessels the essential feature is the vessel's separateness from the ITA.
We encountered wide variation between individuals in the number of collateral vessels that were present. An individual endowed with few collateral vessels would be at greater risk of serious devascularization than an individual with many. The collateral blood supply of the lower half of the sternum appears to be especially precarious. The lower three interspaces possessed only 30% of all the observed collateral vessels. The lower two possessed only 14%.
Our anatomic findings strongly reinforce the recommendation that all ITA branches should be ligated as close as possible to the main vessel trunk to minimize damage to the collateral blood supply of the sternum.
Collateral vessels to the sternum are prone to damage not only when the ITA is being mobilized, but also when the sternal wound is being closed. The use of cerclage wires to approximate the two halves of the sternum could readily occlude sternal/perforating collateral vessels. The distance between these vessels and the sternal edge varied in our series from 0 to 16 mm. The branch lay less than 5 mm from the sternal edge in 44% of instances. The only practical recommendation that our findings support in this regard is that cerclage wires should be placed as close as possible to the edge of the sternum. Our observations do not support any particular recommendation regarding the vertical placement of wires, either high, low, or centrally in the interspace. On average, we found collateral vessels to be distributed evenly among the upper, lower, and central thirds of each interspace.
Cerclage wires also may harm the sternal circulation in another way: by interrupting the vertically running vessels of the anterior and posterior periosteal plexus. The periosteal plexi probably play an important role in sustaining the viability of the sternum after operation, particularly in those segments where the adjoining interspaces have lost their collateral vessels. Although cerclage wires have mechanical advantages, it would seem preferable in terms of sternal blood supply for a sternal closure device to go into the sternum rather than around it.
| Acknowledgments |
|---|
|
|
|---|
| Footnotes |
|---|
|
|
|---|
Address reprint requests to Dr Acland, University of Louisville, 324 MDR Building, Louisville, KY 40292.
| References |
|---|
|
|
|---|
This article has been cited by other articles:
![]() |
E. Gongora and T. M. Sundt III Myocardial Revascularization with Cardiopulmonary Bypass Card. Surg. Adult, January 1, 2008; 3(2008): 599 - 632. [Full Text] |
||||
![]() |
M. Boodhwani and F. D. Rubens Preserved Sternal Perfusion Following ITA Skeletonization: Implications for Bilateral ITA Grafting Ann. Thorac. Surg., November 1, 2007; 84(5): 1796 - 1797. [Full Text] [PDF] |
||||
![]() |
E. Pektok, M. Cikirikcioglu, C. Engin, G. Daglioz, Z. Ozcan, and H. Posacioglu Does harvesting of an internal thoracic artery with an ultrasonic scalpel have an effect on sternal perfusion? J. Thorac. Cardiovasc. Surg., August 1, 2007; 134(2): 442 - 447. [Abstract] [Full Text] [PDF] |
||||
![]() |
R. Petzina, L. Gustafsson, A. Mokhtari, R. Ingemansson, and M. Malmsjo Effect of vacuum-assisted closure on blood flow in the peristernal thoracic wall after internal mammary artery harvesting. Eur. J. Cardiothorac. Surg., July 1, 2006; 30(1): 85 - 89. [Abstract] [Full Text] [PDF] |
||||
![]() |
C. Mills and P. Bryson The role of hyperbaric oxygen therapy in the treatment of sternal wound infection. Eur. J. Cardiothorac. Surg., July 1, 2006; 30(1): 153 - 159. [Abstract] [Full Text] [PDF] |
||||
![]() |
D. Berdajs, G. Zund, M. I. Turina, and M. Genoni Blood Supply of the Sternum and Its Importance in Internal Thoracic Artery Harvesting Ann. Thorac. Surg., June 1, 2006; 81(6): 2155 - 2159. [Abstract] [Full Text] [PDF] |
||||
![]() |
S. Srivastava, S. Gadasalli, M. Agusala, R. Kolluru, J. Naidu, M. Shroff, R. Barrera, S. Quismundo, and V. Srivastava Use of Bilateral Internal Thoracic Arteries in CABG Through Lateral Thoracotomy With Robotic Assistance in 150 Patients Ann. Thorac. Surg., March 1, 2006; 81(3): 800 - 806. [Abstract] [Full Text] [PDF] |
||||
![]() |
Prostaglandin E2 EP4 receptor-selective agonist facilitates sternal healing after harvesting bilateral internal thoracic arteries in diabetic rats. J. Thorac. Cardiovasc. Surg., March 1, 2006; 131(3): 587 - 593. |
||||
![]() |
J. Zeitani, A. P. de Peppo, R. De Paulis, P. Nardi, A. Scafuri, S. Nardella, and L. Chiariello Benefit of Partial Right-Bilateral Internal Thoracic Artery Harvesting in Patients at Risk of Sternal Wound Complications Ann. Thorac. Surg., January 1, 2006; 81(1): 139 - 143. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. M. Calafiore, L. Weltert, M. D. Mauro, G. Actis-Dato, A. L. Iaco, P. Centofanti, M. L. Torre, and F. Patane Internal mammary artery MMCTS, November 29, 2005; 2005(1129): 1008. [Abstract] [Full Text] [PDF] |
||||
![]() |
G. Di Giammarco, M. Pano, M. Contini, P. Pelini, A. Di Francesco, M. Valente, and M. Di Mauro Left anterior small thoracotomy procedure MMCTS, August 9, 2005; 2005(0809): 778. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. A. Fokin, F. Robicsek, T. N. Masters, A. Fokin Jr, M. K. Reames, and J. E. Anderson Jr Sternal Nourishment in Various Conditions of Vascularization Ann. Thorac. Surg., April 1, 2005; 79(4): 1352 - 1357. [Abstract] [Full Text] [PDF] |
||||
![]() |
R. De Paulis, S. de Notaris, R. Scaffa, S. Nardella, J. Zeitani, C. Del Giudice, A. Penta De Peppo, F. Tomai, and L. Chiariello The effect of bilateral internal thoracic artery harvesting on superficial and deep sternal infection: The role of skeletonization J. Thorac. Cardiovasc. Surg., March 1, 2005; 129(3): 536 - 543. [Abstract] [Full Text] [PDF] |
||||
![]() |
O. M. Bical, W. Khoury, Y. Fromes, M. Fischer, M. Sousa Uva, G. Boccara, and P. H. Deleuze Routine Use of Bilateral Skeletonized Internal Thoracic Artery Grafts in Middle-Aged Diabetic Patients Ann. Thorac. Surg., December 1, 2004; 78(6): 2050 - 2053. [Abstract] [Full Text] [PDF] |
||||
![]() |
T. Athanasiou, M.-C. Crossman, G. Asimakopoulos, A. Cherian, A. Weerasinghe, B. Glenville, and R. Casula Should the internal thoracic artery be skeletonized? Ann. Thorac. Surg., June 1, 2004; 77(6): 2238 - 2246. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. Iwakura, Y. Tabata, T. Koyama, K. Doi, K. Nishimura, K. Kataoka, M. Fujita, and M. Komeda Gelatin sheet incorporating basic fibroblast growth factor enhances sternal healing after harvesting bilateral internal thoracic arteries J. Thorac. Cardiovasc. Surg., October 1, 2003; 126(4): 1113 - 1120. [Abstract] [Full Text] [PDF] |
||||
![]() |
K.-B. Kim, K. R. Cho, W.-I. Chang, C. Lim, B. M. Ham, and Y. L. Kim Bilateral skeletonized internal thoracic artery graftings in off-pump coronary artery bypass: early result of Y versus in situ grafts Ann. Thorac. Surg., October 1, 2002; 74(4): S1371 - 1376. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. Iwakura, Y. Tabata, N. Tamura, K. Doi, K. Nishimura, T. Nakamura, Y. Shimizu, M. Fujita, and M. Komeda Gelatin Sheet Incorporating Basic Fibroblast Growth Factor Enhances Healing of Devascularized Sternum in Diabetic Rats Circulation, September 18, 2001; 104 (2009): I-325 - I-329. [Abstract] [Full Text] [PDF] |
||||
![]() |
T. Higami, T. Yamashita, H. Nohara, K. Iwahashi, T. Shida, and K. Ogawa Early results of coronary grafting using ultrasonically skeletonized internal thoracic arteries Ann. Thorac. Surg., April 1, 2001; 71(4): 1224 - 1228. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. M. Calafiore, M. Contini, G. Vitolla, M. Di Mauro, V. Mazzei, G. Teodori, and G. Di Giammarco Bilateral internal thoracic artery grafting: Long-term clinical and angiographic results of in situ versus Y grafts J. Thorac. Cardiovasc. Surg., November 1, 2000; 120(5): 990 - 998. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. Iwakura, Y. Tabata, K. Nishimura, T. Nakamura, Y. Shimizu, M. Fujita, and M. Komeda Basic fibroblast growth factor may improve devascularized sternal healing Ann. Thorac. Surg., September 1, 2000; 70(3): 824 - 828. [Abstract] [Full Text] [PDF] |
||||
![]() |
P. C. Ng, A. N. Chua, M. S. Swanson, T. C. Koutlas, W. R. Chitwood Jr, and J. R. Elbeery Anterior thoracotomy wound complications in minimally invasive direct coronary artery bypass Ann. Thorac. Surg., May 1, 2000; 69(5): 1338 - 1340. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. M. Calafiore, G. Vitolla, A. L. Iaco, C. Fino, G. Di Giammarco, F. Marchesani, G. Teodori, G. D'Addario, and V. Mazzei Bilateral internal mammary artery grafting: midterm results of pedicled versus skeletonized conduits Ann. Thorac. Surg., June 1, 1999; 67(6): 1637 - 1642. [Abstract] [Full Text] [PDF] |
||||
![]() |
O. Wendler, D. Tscholl, Q. Huang, and H.-J. Schafers Free flow capacity of skeletonized versus pedicled internal thoracic artery grafts in coronary artery bypass grafts Eur. J. Cardiothorac. Surg., March 1, 1999; 15(3): 247 - 250. [Abstract] [Full Text] [PDF] |
||||
![]() |
M. Sousa Uva, E. Braunberger, M. Fisher, Y. Fromes, P. H. Deleuze, J. A. Celestin, and O. M. Bical Does bilateral internal thoracic artery grafting increase surgical risk in diabetic patients? Ann. Thorac. Surg., December 1, 1998; 66(6): 2051 - 2055. [Abstract] [Full Text] [PDF] |
||||
![]() |
S. Pagni, E. J. Salloum, G. R. Tobin, D. J. VanHimbergen, and P. A. Spence Serious wound infections after minimally invasive coronary bypass procedures Ann. Thorac. Surg., July 1, 1998; 66(1): 92 - 94. [Abstract] [Full Text] [PDF] |
||||
![]() |
A. El Gamel, N. A. Yonan, R. Hassan, M. T. Jones, C. S. Campbell, A. K. Deiraniya, and R. A. M. Lawson Treatment of Mediastinitis: Early Modified Robicsek Closure and Pectoralis Major Advancement Flaps Ann. Thorac. Surg., January 1, 1998; 65(1): 41 - 46. [Abstract] [Full Text] [PDF] |
||||
![]() |
J. A. Henriquez-Pino, W. J. Gomes, J. C. Prates, and E. Buffolo Surgical Anatomy of the Internal Thoracic Artery Ann. Thorac. Surg., October 1, 1997; 64(4): 1041 - 1045. [Abstract] [Full Text] |
||||
![]() |
I. A. Nicholson and H. S. Paterson Modified T Graft for Triple-Vessel Disease Ann. Thorac. Surg., August 1, 1997; 64(2): 451 - 453. [Abstract] [Full Text] |
||||
![]() |
S. C. Hendrickson, K. E. Koger, C. J. Morea, R. L. Aponte, P. K. Smith, and L. S. Levin Sternal Plating for the Treatment of Sternal Nonunion Ann. Thorac. Surg., August 1, 1996; 62(2): 512 - 518. [Abstract] [Full Text] |
||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| ANN THORAC SURG | ASIAN CARDIOVASC THORAC ANN | EUR J CARDIOTHORAC SURG |
| J THORAC CARDIOVASC SURG | ICVTS | ALL CTSNet JOURNALS |