Transversus abdominis plane (TAP) block is an anesthesia method that provides somatic analgesia to the anterior and lateral abdominal walls. Thus, TAP block is widely implemented in perioperative management of colorectal cancer patients.

Researchers aimed to evaluate the analgesic effectiveness and duration of effect of dexmedetomidine added to bupivacaine in the TAP block applied in colorectal cancer surgeries.

Transversus abdominis plane (TAP) block is an anesthesia method that provides somatic analgesia to the anterior and lateral abdominal walls. With the increasing use of ultrasound guidance during peripheral nerve blocks, trunk blocks such as the transversus abdominis plane (TAP) block are widely used for analgesia after abdominal surgery.

The advantages of TAP block include being less invasive than epidural analgesia, lower incidence of hypotension, and shorter hospital stay. Due to these advantages, TAP block has become a widely preferred method.

Researchers aimed to evaluate the analgesic effectiveness and duration of effect of dexmedetomidine added to bupivacaine in the TAP block applied in colorectal cancer surgeries. The study will be conducted in a tertiary oncology hospital in Turkey and 84 colorectal cancer patients will be included.

Inclusion Criteria:

• colorectal cancer diagnosis
• undergoing colorectal cancer surgery

Exclusion Criteria:

• allergic reaction to local anesthetics
• bleeding anomalies
• infection in TAP block area

The investigators will evaluate colorectal cancer patients from Ankara Dr. Abdurrahman Yurtaslan Oncology Train and Research Hospital who will undergo colorectal cancer surgery.

The investigators will exclude patients who no longer want to participate at any part of the trial.

A total of 84 patients' data will be collected.