Scenario

You receive a call for a 65-year-old male complaining of left arm pain and swelling three days after being treated at the local hospital following a fall from height. Upon inquiry you determine that the patient had several venipunctures to obtain blood specimens, and two separate intravenous access sites. On examination you identify erythema, warmth, and induration along the medial forearm at a presume intravenous access site. His temperature is 38.4°C, heart rate is 102, and he appears uncomfortable when the affected area is palpated. As an experienced clinician you immediately suspect phlebitis and possibly extravasation. His clinical presentation raises the indices of suspicion for infection which may be progressing. The scenario highlights a critical reality of care – the need for aseptic technique during vascular access and the impact that deviations can have on outcomes.

Aseptic Techniques and Microbiology

Aseptic technique refers to the collection of practices and procedures designed to maintain sterility and prevent the introduction of microorganisms into sterile areas or body systems. In the context of vascular access, aseptic technique encompasses hand hygiene, skin antisepsis, equipment handling, and proper IV management protocols. Both in the field and in the hospital, this can be more difficult than it sounds. In the field there are scenarios that make assurance extraordinarily difficult despite best efforts.

Human skin is colonized by billions of microorganisms. The normal skin flora of the forearm and upper extremities includes commensals such as Corynebacterium, Propionibacterium, and non-pathogenic Staphylococcus species. However, pathogenic organisms—particularly Staphylococcus aureus (including methicillin-resistant strains) and Streptococcus pyogenes—also reside on the skin surface and in hair follicles.

Both in hospital and in the field there are related risks from other organisms such as Clostridioides difficile (C. diff) and Escherichia coli (E.coli) but while these are risks the do not usually colonize healthy skin. As a result, they rarely cause primary IV site infections unless fecal contamination occurs. This is cited purely due to the incidence of these presenting conditions and the challenge that some patients have in maintaining cleanliness.

When an IV catheter breaches the skin barrier, it creates a direct pathway for these microorganisms to enter the bloodstream. If the skin was not properly prepped the catheter becomes an ideal introducer for the bacteria. The catheter itself becomes a foreign body that can serve as a nidus for bacterial adhesion and biofilm formation. Unlike in the controlled environment of a hospital, prehospital providers often work in suboptimal conditions—traffic on the roadside, ambient dust, limited water availability for hand washing—all of which increase the risk of contamination. Although the risk remains higher in a prehospital environment, the risk in hospital remains significant.

Catheter-Related Complications

Catheter-related bloodstream infections (CRBSIs) and phlebitis can develop from contamination during insertion, via migration of bacteria from the skin along the catheter track, or through seeding from bacteremia elsewhere. Phlebitis—inflammation of the vein—can be mechanical (from catheter trauma), chemical (from infusate irritation), or infectious (from bacterial colonization). The patient in our scenario is experiencing what appears to be infectious phlebitis, but it could have begun as mechanical phlebitis that secondarily became infected. Although it is difficult at times to determine root cause, the treatment is not likely to vary regardless of origin.

Presentation of IV Phlebitis

Patients with phlebitis typically present with pain, erythema (redness), warmth, and induration (hardening) along the course of the vein distal to the IV insertion site. The erythema may extend several centimeters beyond the visible catheter insertion area. Patients often report tenderness that increases with palpation. When phlebitis progresses to bacteremia or sepsis, patients may present with fever, chills, malaise, and tachycardia. Laboratory findings—when available—typically show elevated white blood cell count and may include positive blood cultures if progression to septicemia has occurred.

Mechanical or chemical phlebitis can develop within 24-48 hours of line placement, though it may not be immediately apparent to the patient. Infectious phlebitis typically develops 48-72 hours post-insertion, as bacteria must proliferate and incite an inflammatory response. The progression from localized phlebitis to

Several factors increase the risk of phlebitis and infection in the prehospital setting: (1) difficulty accessing clean skin due to environmental contamination or patient diaphoresis, (2) necessity of emergent access that may sacrifice technique for speed, (3) inability to maintain the dressing and IV site integrity during patient transport, (4) lack of antimicrobial dressing materials in many EMS systems, and (5) absence of follow-up assessment in the prehospital phase to detect early signs.

PARAMEDIC ASSESSMENT FOR VASCULAR ACCESS COMPLICATIONS

Before inserting a catheter, assess the potential insertion site for signs of infection, dermatitis, or obvious contamination. Palpate the vein to determine patency and viability. Observe your environment and your own hygiene before touching sterile equipment or the patient's skin. During transport and care, periodically assess the IV site for signs of infiltration, extravasation, or early phlebitis. Note the condition of the dressing, the clarity of the tubing, and any patient complaints of localized pain.

Identifying Red Flags

Clinical Sign/Risk

Clinical Significance

Erythema extending >1cm from insertion site

Suggests inflammation; may indicate early infection

Palpable cord along vein

Indicates thrombophlebitis; requires removal and reassessment

Patient fever with IV site tenderness

Suggests possible CRBSI; should prompt hospital notification

Purulent drainage or pus at insertion site

Definite sign of infection; line should be removed immediately

Aseptic Technique

Hand Hygiene

(Hand hygiene is the cornerstone of aseptic technique. Before placing any IV line, wash your hands with soap and water if available, paying particular attention to the fingernails, between fingers, and wrists. Friction and soap are crucial for removing transient flora. Alcohol-based hand sanitizer (with at least 60% alcohol) is acceptable when soap and water are unavailable, though it is not as effective on visibly soiled hands.

In the prehospital setting, consider using hand hygiene stations, antiseptic hand wipes, or small bottles of hand sanitizer in your equipment. Many progressive EMS systems now include alcohol-based sanitizer in jump bags, response vehicles, and rescue squad (ambulance).

Skin Preparation

Proper skin antisepsis reduces the bacterial load on the insertion site, thereby decreasing the likelihood of line-related infection. Two primary agents are used in prehospital care:

Chlorhexidine (0.5-4%): The preferred agent in many hospital settings and increasingly in EMS. It has rapid onset (within 30 seconds) and persistent activity. Chlorhexidine gluconate provides superior antiseptic properties compared to povidone-iodine and is less likely to cause allergic reactions.

Povidone-Iodine (10%): Effective but slower to act (requires 1-2 minutes). Must be allowed to dry. Contraindicated in patients with iodine or shellfish allergy.

Application technique: Apply the antiseptic in a circular motion, starting at the intended puncture site and moving outward in widening concentric circles to create a sterile zone of at least 2-3 inches in diameter. Allow the agent to dry completely before puncturing the skin (this is critical—inserting through wet antiseptic reduces its effectiveness).

Preparing Equipment

Before touching a sterile IV catheter or needle, ensure your work environment is as clean as possible. In the field, this means placing equipment on a clean surface (patient's arm, clean towel, or equipment pad) rather than on the ground or contaminated surfaces. Use sterile packages and inspect for tears or punctures before opening. Do not use equipment if the sterile packaging is compromised.

Catheter Insertion

Once the package is opened, handle the catheter using only the hub or the insertion device, never the needle or the external surface of the catheter itself. Minimize the time the needle is exposed to the environment. Use smooth, controlled insertion technique to reduce tissue trauma. Insert at the appropriate angle (typically 10-15 degrees for upper extremity veins) to prevent through-and-through puncture.

Dressing and Securing

After successful catheter placement, secure the catheter with sterile tape or adhesive dressing. Antimicrobial dressings (such as chlorhexidine-impregnated pads) should be used if available in your system, as evidence supports their efficacy in reducing CRBSI rates. Cover the insertion site with a transparent dressing that allows visualization of the site but prevents gross contamination. Use a Tegaderm or similar securing device if available.

Label the dressing with the date and time of insertion and your initials (or provider name per protocol). This provides clear tracking and helps hospital staff identify old lines requiring assessment. In many systems, lines older than 72 hours are automatically reassessed or replaced..

Infection Rates in Prehospital Intravenous Access

Catheter-Related Bloodstream Infection (CRBSI) Epidemiology

In hospital settings, CRBSI rates are typically reported as 3-5 per 1,000 catheter-days for central lines and lower for peripheral lines. Prehospital CRBSI rates are less well documented, but studies suggest that without rigorous aseptic technique, rates in the field may rival or exceed hospital rates due to suboptimal conditions.

A landmark study by Maiello et al. (2009) examining prehospital IV complication rates found that mechanical phlebitis occurred in approximately 2-3% of prehospital IV starts, with infectious complications developing in a subset of these patients. The study emphasized that provider adherence to aseptic technique was the strongest modifiable risk factor.

Chlorhexidine vs. Povidone-Iodine in EMS

Comparative effectiveness studies have shown chlorhexidine to be superior to povidone-iodine in reducing CRBSI rates. A meta-analysis by Chaiyakunapruk et al. (2002) demonstrated a 49% relative risk reduction in CRBSI when chlorhexidine was used for central line care. While most prehospital studies have not directly compared these agents in the field setting, the principle of using the more effective antimicrobial is sound. In reality most EMS systems utilize the supplies obtained from the hospital during restock. Assuring consistent use both in and out of hospital may be assistive in reducing infection risk.

Phlebitis remains one of the most common complications of peripheral IV therapy in both hospital and prehospital settings. Studies from EMS systems that implemented formal aseptic technique training and quality assurance programs reported reductions in phlebitis rates from approximately 5-7% down to 1-2%, representing a 50-70% decrease.

References