Final answer:
The purse string suturing technique is used for aortic and atrial cannulation during cardiopulmonary bypass surgeries. It seals the cannulation site securely and allows for adjustment as needed.
Step-by-step explanation:
The suturing technique that is used for aortic and atrial cannulation for cardiopulmonary bypass is the purse string technique.
The purse string suture is commonly used during cardiac surgery to create a seal around the site where a cannula will be inserted. This technique involves placing sutures in a circular pattern around the cannulation site and then tightening them to form a 'purse string', which provides a secure point of entry for the cannula without causing excessive damage or bleeding from the vessel. The purse string suture must be placed precisely and be strong enough to support the cannula during the duration of the bypass procedure. This method also allows for the suture to be loosened and tightened as necessary, making it a versatile and practical choice for such critical procedures.