Mastering the "Basic" Skills of Peripheral IV Access

In the emergency department, few procedures are as common as peripheral intravenous (IV) cannulation. It’s often seen as a “basic” task, handed off to the most junior member of the team. But this is a fundamental skill and “subtleties in technique are important. Mastering peripheral IV access is the art of turning a challenging, painful experience for the patient into a quick, successful procedure. It’s a core competency for emergency physicians, especially when resuscitation is on the line. This article digs into the key pearls from the literature to elevate your technique from novice to expert.

The ‘Why’ & ‘Why Not’: Indications and Critical Contraindications

While we all know IVs are for fluids, meds and blood products, there is also a critical point for resuscitation.

The CPR Pearl : In a cardiac arrest, don’t delay care by trying for central access. While medications do reach the central circulation faster via a central line, no change in outcome has been demonstrated. Peripheral IV cannulation is the procedure of choice during CPR because it is faster, easier and safer.

Equally important is knowing the “no-go zones.” Do not place an IV in an extremity with:

Significant edema, burns, sclerosis, phlebitis or thrombosis.
An overlying area of cellulitis (risk of bacteremia).
An ipsilateral (same side) radical mastectomy or an AV fistula/shunt.

The ‘Where’: Anatomy, Site Selection, and Resus Options

Choosing your site is the first step to success. Start distally (e.g., the hand) and move proximally, saving the “big guns” for when you need them.

Hand (Dorsal Venous Arch): Excellent for 20-22g catheters. They are easy to see and stabilize but can be uncomfortable for the patient and prone to infiltration. Fig: B
Forearm (Cephalic & Basilic Veins): These are your workhorses. The cephalic (“intern’s vein”) is a classic. The basilic vein, coursing along the ulnar side, is “often ignored” but is an excellent, large, and easily accessible option. Fig: A
Antecubital Fossa (AC): The “easy win” for large-bore access (16-18g). This is the standard site for IV contrast-enhanced CT studies (like a CTPA). The obvious downside is the restriction of the patient’s mobility.
External Jugular (EJ) Vein: A vital resus skill. Place the patient in Trendelenburg and rotate their head to the opposite side. Be aware: the text notes that valves, typically 4cm above the clavicle, can impede function.
Lower Extremities: A last resort in adults, especially in patients with vascular disease or diabetes. These sites have a much higher risk of phlebitis, infection, and thrombosis. Fig: C

The ‘How’: Pro-Tips for Elevating Your Technique

This is where the subtleties make all the difference.

Pro-Tip 1: Anesthesia is Not Optional

Local anesthesia “significantly decreases pain” and “should be considered part of routine care.” A small subcutaneous wheal of lidocaine (instilled slowly with a 27g needle) is a mark of a compassionate and professional provider. For peds, EMLA cream is an option, but its 60-minute onset time is a major disadvantage in the ED.

Pro-Tip 2: The ‘Difficult Access’ Toolkit

When veins are non-visible and non-palpable, try these adjuncts:

Heat Packs: Apply for 10-20 minutes to increase venous engorgement.
Nitroglycerin Ointment: Applying a small amount of 2% nitroglycerin ointment for 2 minutes has been shown to increase vein diameter two- to six-fold and improve first-attempt success. (It is, of course, contraindicated in hypotensive patients).

Pro-Tip 3: The Ultrasound Paradox

Ultrasound is a game-changer for difficult access, but it’s not a silver bullet. There is a key “paradox”:

It works: US guidance significantly increases success rates in patients with perceived difficult access.
It can fail: In patients with perceived easy access, one trial noted landmarks-alone was more successful.
The Warning: US-guided peripheral IVs have a high premature failure rate. This is likely due to cannulating deeper veins at a steeper angle. A line that “tissues” an hour later was not a true success.

Pro-Tip 4: The 1-2mm “Locker” Step

This is the single most important mechanical skill. The text outlines it perfectly:

Puncture the skin and enter the vein.
Once you see the initial “flash” of blood in the chamber, STOP.
Lower your angle (almost flat to the skin) and advance the entire unit (needle and cannula) several millimeters more. This is the “locker” step—it ensures the plastic cannula itself, not just the sharp needle tip, is fully inside the vein’s lumen.
Now, hold the needle static and advance only the catheter over the needle into the vein.

Failing to do Step 3 is the most common reason for “blowing” a vein that you had a flash for.

step by step for peripheral IV insertion

The ‘Aftercare’: Maintenance & Blood Draws

Saline vs. Heparin: Myth Busted: Stop asking for heparin flushes. Saline flushes are as effective as heparin in maintaining patency and preventing phlebitis, but without the cost or risks of hemorrhage or heparin-induced thrombocytopenia (HIT).
Drawing Blood from an IV: You can get accurate labs from a new IV, saving the patient a second needle stick. The correct technique is:
1. Turn off any infusions for at least 2 minutes.
2. Attach a 10ml syringe and waste at least 5 mL of blood.
3. Attach your blood collection device or a new syringe to draw your samples.

The ‘Oh No’: Complications and How to Manage Them

Even with perfect technique, complications happen. Here’s the rapid-fire management.

Phlebitis: The vein becomes a palpable, warm, red cord.
- Management: Remove the catheter immediately. Apply warm compresses.
Infiltration/Extravasation: The fluid “tissues,” causing a painful, swollen, and cool site.
- Management: Stop the infusion. Remove the cannula. Elevate the limb.
- Critical Pearl: If the extravasated drug is a vasopressor (like adrenaline/epinephrine or noradrenaline) or a chemotherapeutic agent, this is a medical emergency. The antidote for vasopressor extravasation is local injection of phentolamine.
Nerve Injury: The patient reports sharp, “electric” pain, numbness, or paresthesia during insertion.
- Management: STOP. IMMEDIATELY. Remove the needle. Do not “fish” or probe. Document the event thoroughly.
Thrombosis: The line is clotted and won’t flush.
- Management: Do NOT flush forcefully, as this can dislodge a clot and cause a pulmonary embolism (PE). Attempt to aspirate. If no blood returns, remove the line and replace it.
Air Embolism (Rare): A large amount of air is infused, leading to sudden chest pain, dyspnea, and vascular collapse.
- Management: Immediately place the patient in the left lateral decubitus Trendelenburg position. This traps the air in the apex of the right ventricle, preventing it from entering the pulmonary circulation. Give 100% oxygen.