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Ann Thorac Surg 1997;64:1523-1524
© 1997 The Society of Thoracic Surgeons

Correspondence

Ninety-Degree Two-Stage Venous Cannula

Liberato Sávio S. Souza, MD

Department of Cardiovascular Surgery, Hospital São João de Deus, Rua do Cobre, 800, Cep: 35.500-221, Divinópolis, Mg, Brazil e-mail:liberato{at}divinopolis.uemg.br

To the Editor:

I carefully read Lawrence and Desai's article [1] on the use of a 45-degree two-stage venous cannula, the purpose of which is to confer good exposure with regard to the surgeon's position and maintain venous return under heart displacement conditions.

I would like to inform you that I developed a 90-degree two-stage venous cannula in 1987, and this cannula was patented at the Nacional Institute of Nacional Property. According to Bugge and associates' description [2], the difference between the two cannulas lies in the fact that Bugge and associates' cannula will be inserted in the inferior vena cava, whereas my cannula has been conceived to be inserted into the superior vena cava (Fig 1Go).



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  		Fig 1. . The cannula has been conceived to be inserted into the superior vena cava.

 
Nevertheless, the purposes of both cannulas are quite the same, according to the authors' information. A recent change in the referred cannula allows it to be used in aortic operations with retrograde cerebral perfusion.

References

  1. Lawrence DR, Desai JB. Forty-five–degree two-stage venous cannula: avantages over standard two-stage venous cannulation. Ann Thorac Surg 1997;63:253–4.[Abstract/Free Full Text]
  2. Bugge M, Lepore V, Dahlin A. The "90 degree bent" two-stage venous cannula. Eur J Cardiothorac Surg 1995;9:526–7.[Abstract/Free Full Text]



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