Free CRNI Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation: Dopamine is a vesicant and vasoactive medication that can cause severe tissue necrosis if extravasation occurs. Continuous infusions of vasopressors or inotropes must be administered through a central venous access device whose tip resides in a large central vein, allowing rapid dilution. Peripheral or midline catheters are contraindicated for continuous vesicanttherapy. Subcutaneous administration is not appropriate for dopamine. Correct device selection based on the pharmacological properties of the infusate is a critical competency tested under both Access Devices and Infusion Therapies (Cardiovascular section).

Comprehensive and Detailed Explanation: According to CRNI® Principles of Practice and Infusion Therapy Standards of Practice, site selection must account for underlying neurovascular structures. The ventral (volar) surface of the wrist contains the radial nerve and associated tendons in close proximity to superficial veins; puncture in this area increases the risk of nerve injury, paresthesia, or complex regional pain syndrome. Preferred sites are generally the dorsal hand or forearm veins that are straight, soft, and away from joints and nerves. The antecubital fossa is avoided for routine short peripheral catheters because of joint motion, risk of arterial puncture, and difficulty maintaining patency. In older adults, fragile skin and loss of subcutaneous tissue require careful assessment, but the dorsum of the hand is not exclusively preferred. The medial forearm near the ulnar nerve is also a higher-risk area. Proper body positioning of the extremity during insertion further reduces mechanical trauma. This knowledge aligns with anatomy-and-physiology content weighted in the Principles of Practice domain and supports safe practice to prevent local complications.

Comprehensive and Detailed Explanation: Rapid infusion of vancomycin can cause vancomycin-infusion reaction (formerly “red-man syndrome”) characterized by flushing, pruritus, and hypotension due to histamine release. Extending the infusion to at least 60 minutes (or longer for higher doses) significantly reduces this risk. Intravenous push administration is contraindicated. Vancomycin is incompatible with heparin, and routine filtration is not required for this medication. Anti-infective therapy administration principles are tested under Infusion Therapies.

Comprehensive and Detailed Explanation: Mild erythema and serous drainage without systemic signs or purulence may represent local irritation rather than infection. The site should be thoroughly cleaned, a new sterile dressing applied, and the patient monitored for progression. Premature catheter removal is not indicated; empiric antibiotics without evidence of infection contribute to resistance. Accurate assessment and staged response to potential local complications are essential skills within the Access Devices domain.

Comprehensive and Detailed Explanation: Subtherapeutic aPTT indicates inadequate anticoagulation and elevated risk of thrombosis. The nurse follows the established nomogram or provider orders to adjust the infusion rate and communicates the result. Stopping therapy, giving unauthorized boluses, or changing agents exceeds nursing scope. Monitoring and managing anticoagulant infusions are essential within Infusion Therapies.