The Double-Edged Sword Effect: Safety And Complication Prevention Of The Veress Needle

https://en.wikipedia.org/wiki/Veress_needle

The Veress needle is hailed as the "guardian" of laparoscopic surgery, yet it is inherently a double-edged sword. Statistics indicate that approximately 50% of major vascular injuries​ in laparoscopic surgery occur during the initial access phase, with Veress needle-related injuries accounting for a significant proportion. This reality compels the surgical community to constantly reflect: how can we maximize the benefits of its convenience while minimizing risk?

First, understanding the inherent limitations​ of the Veress needle is crucial. The spring-retraction mechanism relies on the sudden disappearance of tissue resistance. However, in certain pathological states (such as abdominal wall scarring, obesity, or distension), this change in resistance is atypical, leading to delayed stylet deployment or incomplete coverage of the sharp tip. Furthermore, the needle may inadvertently enter the pre-peritoneal space, causing subcutaneous emphysema or pneumomediastinum. Rare complications reported in the literature include gas embolism​ (incidence <0.01%), primarily resulting from direct vascular penetration by the needle tip.

In response to these risks, several safety strategies have proven effective. First is the "Z-track technique": advancing the needle obliquely through the subcutaneous tissue before entering the abdomen vertically. This creates a tissue flap over the tract, reducing gas leakage and bleeding. Second is the use of the "open-entry technique" (Hasson technique)​ as an alternative to closed access. This involves directly incising through all layers of the abdominal wall to the peritoneum, allowing trocar placement under direct vision. While more time-consuming, the open technique is demonstrably safer for high-risk patients.

Recently, evidence-based medicine has driven updates to clinical guidelines. The Society of American Gastrointestinal and Endoscopic Surgeons (SAGES)​ recommends:

• Closed Veress entry​ remains the first choice for non-obese patients with no history of abdominal surgery.
• Open entry or optical trocars​ are preferred for patients with multiple prior surgeries, obesity, or pregnancy.

The European Association for Endoscopic Surgery (EAES)​ emphasizes that regardless of the technique, pre-operative imaging assessment​ (CT or ultrasound) is vital for identifying aberrant anatomy.

Notably, the safety of the Veress needle is closely linked to operator experience. A study involving over 5,000 cases showed that the complication rate was 0.3%​ when performed by attending surgeons with >5 years of experience, but rose to 1.2%​ when performed independently by residents. Consequently, a standardized training system and supervision mechanism are indispensable. Many hospitals adopt a "stepwise learning model": practicing over 50 times in a simulator, followed by completing 20 supervised cases, before independent operation is permitted.

Looking ahead, intelligent technology​ may be the breakthrough for enhancing safety. Prototypes already exist that integrate pressure sensors and accelerometers. Using machine learning algorithms, these devices analyze penetration waveforms in real-time to automatically identify tissue layers (such as fascia and peritoneum) and trigger alerts upon detecting abnormal resistance. This "Smart Veress Needle"​ promises to minimize human error.

Conclusion

The safety of the Veress needle hinges on three elements: device quality, surgical technique, and patient selection. None can be omitted. Only by comprehensively acknowledging its potential risks and implementing targeted preventative measures can we truly harness the value of this classic instrument.