For patients with hematologic malignancies, phlebitis can not only lead to sepsis, affecting the diagnosis and treatment of the disease, but also prolong hospitalization, increase the economic burden on patients, and add pressure to caregivers. It even increases the difficulty of venipuncture and nursing workload for healthcare workers. Therefore, finding effective ways to prevent and treat phlebitis is crucial.
According to the "Nursing Treatment Practice Standards" (8th edition) issued by the Infusion Nurses Society in America [7]: Phlebitis is caused by various factors stimulating the vascular endothelium, resulting in inflammation of the vessel wall, local venous pain, redness, swelling, and, in severe cases, formation of inflammatory changes such as cord-like veins. The standard divides phlebitis into four levels: Grade 0, no symptoms; Grade 1, redness at the infusion site with or without pain; Grade 2, pain at the infusion site with redness or swelling; Grade 3, pain at the infusion site with redness or swelling, cord-like formation visible, and Grade 4, pain at the infusion site with redness or swelling, visible cord-like veins > 2.5 cm, and purulent discharge.
Research [8] has pointed out the mechanism of non-chemotherapeutic drug-induced phlebitis: (1) high drug concentration, rapid infusion rate, exceeding the vascular buffering capacity, or drug accumulation at vascular damage sites can stimulate the vascular endothelium and cause phlebitis. (2) The insoluble particles in drugs, mainly including drug crystals and non-drug particles, are related to the occurrence of phlebitis. Insoluble particles account for about 70% of the occurrence of phlebitis. Insoluble particles stimulate the vascular endothelium during the process of blood circulation, leading to changes in the normal state of the vessel wall and endothelial damage, which triggers platelet aggregation and adhesion, thereby inducing phlebitis.
Peripheral intravenous infusion of liposomal amphotericin B is highly irritating to blood vessels, with long infusion times, high concentrations, and a high likelihood of causing phlebitis. In this case, liposomal amphotericin B cholesterol sulfate complex was used. When preparing the drug, strict adherence to aseptic and on-demand requirements was maintained. According to the instructions, sterile water for injection was used to dissolve the drug, and 5% glucose injection volume recommended by the manufacturer was rapidly added to the bottle, which was gently shaken and rotated to ensure complete dissolution. During infusion, the drug was protected from light, and a separate light-resistant infusion pump was used to minimize particle contamination. Following the medication guidance [9] and physician's instructions, the infusion time for the first group of liposomal amphotericin B cholesterol sulfate complex exceeded 10 hours, and for the second group, it exceeded 8 hours, with a total infusion time of approximately 20 hours. Although 20 ml of 5% glucose injection was used to flush the catheter every 2 hours, and the indwelling needle was regularly replaced during this period, the long infusion time and duration of treatment reached 18 days. Additionally, the drug concentration of liposomal amphotericin B is positively correlated with the occurrence of phlebitis. Studies have shown that the incidence of phlebitis significantly decreases after reducing the drug concentration. In this case, according to the recommended dose of 3.0–4.0 mg/kg in the instructions, the dose of liposomal amphotericin B cholesterol sulfate complex for each group reached 100 mg. Although our department used a microinfusion pump for slow intravenous infusion and strictly controlled the infusion rate, the maximum drug concentration reached 12 mg/h. Therefore, the occurrence of phlebitis is not surprising. According to the phlebitis grading criteria, the phlebitis in this case was classified as Grade II. Recommended treatment methods in the "Nursing Treatment Practice Standards" include local cold compress with ice packs for 1–2 hours, which reduces local temperature, gradually contracts blood vessels, relieves bleeding, bruising, and swelling, and decreases metabolism and nerve conduction to achieve anti-inflammatory and analgesic effects. Another method is to moisten gauze pads with 50% magnesium sulfate solution. Magnesium sulfate is a hypertonic solution, and both Mg2+ and SO₄²⁻ are strong polar substances. Both can absorb water from tissues due to concentration differences, thereby reducing swelling, and so on. After the occurrence of this case, our department applied mupirocin ointment, lidocaine cream, and magnesium sulfate wet compress successively, with unsatisfactory results and even a trend towards worsening. Our department chose to use a specific electromagnetic wave therapy device for infrared therapy, and after 6 consecutive days of treatment, the patient's phlebitis was cured.
The specific electromagnetic wave therapy device is a three-in-one therapeutic instrument integrating magnetic therapy and infrared therapy. Through the irradiation of far-infrared wavelengths and magnetic therapy, the human body's metabolism can be promoted. The basis of infrared therapy lies in the thermal effect. Infrared radiation has strong penetration through human skin and subcutaneous tissue. Under infrared irradiation, tissues heat up, generating a thermal effect that promotes blood circulation and metabolism, increases cellular phagocytic function, eliminates swelling, and has anti-inflammatory and regenerative effects [10]. Additionally, far-infrared wavelengths are close to the vibration frequency of human cell molecules. After irradiation on the human body, some cell atoms and molecules resonate, generating heat through molecular friction, increasing local temperature, dilating local blood vessels, improving blood circulation, facilitating the removal of harmful substances and vascular deposits, thereby reducing local pain and swelling [5].
In summary, timely and effective intervention for phlebitis is crucial for patient recovery and health, as it can alleviate symptoms, prevent complications, improve treatment outcomes, promote wound healing, prevent recurrence, and ensure patient health and quality of life. The nursing team should closely monitor the patient's condition, understand the mechanism of phlebitis, identify and diagnose early phlebitis to ensure effective and rapid treatment.