To evaluate the effect of implementing teaching protocol on nurse's knowledge and practice regarding infection control measures for patients undergoing Percutaneous Nephrolithotomy.

Percutaneous Nephrolithotomy (PCNL) is a surgery to remove kidney stones that are too large to pass on their own. Percutaneous" means that the procedure occurs through the skin. "Nephrolithotomy" means the removal of a calculus (kidney stone) from a kidney . Percutaneous Nephrolithotomy is typically recommended when kidney stones are larger than 0.8 inch (2 centimeters) in diameter. . Percutaneous Nephrolithotomy (PCNL) has altered dramatically the management of urolithiasis. In fact, these treatment modalities have nearly 99% success rates for treatment of upper urinary tract stones. . There were several complications related to Percutaneous Nephrolithotomy such as fever (23%) and bleeding necessitating transfusion (12%). Extravasation was seen in 7% of patients and transient ureteral obstruction in 6%. The complications limit surgical outcome of PCNL. Infection remains the most common complication arising from this procedure and some patients develop septicemia and septic shock, resulting in increased mortality and morbidity. So, the success of the Percutaneous Nephrolithotomy depends on the maintenance of infection control precautions. This is why investigator looked at this study. Knowledge of the nurse of percutaneous nephrolithotomy care was of crucial importance and had an impact on nurse's practice. The main goal of care was to prevent infection undergoing the percutaneous nephrolithotomy The nurses' role preventing infection for patient undergoing (PCNL) and mainly maintain the sterile field and after operation safety removing (PPE), washing instruments used during operation all of that resulting in positive surgical outcomes Infection control is an important concern for health care professionals specially nurses. Nurses have higher risk for both self-acquiring and transmitting infections to other patients infection control practices form the backbone of nurse's. Nurses has the distinctive opportunity to reduce hospital - acquired infections by utilizing the skills and knowledge about infection control measures, they can facilitate patient recovery while minimizing complications related to infections. Compliance with infection control and sterile technique principles will be prevent nosocomial infections in the operating room, and the patient's hospital stay being shorter and a reduced cost for the medical aids and hospitals . the investigators searched for this topic in many sites such as PubMed Central, Research Gate, and Science.gov.The current topic was not covered in the previous studies. Previous studies did not include specific point about this topic but include general point about PCNL and this strong rational for this study. This study will be carried out to evaluate the knowledge and practice about standard precautions and infection control measures and to explore education needs of nurses.

Generally, programs of healthcare education vary greatly in their contents and approaches .Various forms of visual aids are currently used in healthcare education including illustrations such as photographs and animations such as computer -generated clips and video clips.

Inclusion Criteria:

1- Nursing Staff providing nursing care services for patient undergoing PNL (pre-intra-post) operative care.

Exclusion Criteria:

1. Head nurses
2. Nurses refused to participate in the study

nurse working in urology department