Overview

Infectious Thrombophlebitis? Does this word seem too complex and maybe scare you a scare? Don’t worry - We got you covered. The word “ thrombo “ means clot, “ phleb”  means vein, a vessel carrying deoxygenated blood, “itis” means inflammation, a natural way the body will react to an infection, injury or an irritation causing redness, swelling, heat with/without pain. Thus, infectious thrombophlebitis means blood clot formation in a vein that becomes infected.

It's not usually serious and often gets better on its own after 1 or 2 weeks. Early diagnosis and prevention are vital, as they can prevent serious complications.¹

Causes of infectious thrombophlebitis

Infectious thrombophlebitis is a condition that can arise from a variety of causes and presents challenges to both patients and healthcare professionals. Numerous factors can influence its development:

1. Bacterial infections: They can spread directly from an injury, surgery, or the insertion of medical devices like catheters, or indirectly through blood from an infection in another part of the body. Common bacteria involved include Staphylococcus aureus, Streptococcus species, and Gram-negative bacteria such as Pseudomonas and Klebsiella
2. Viral causes: More common in immunocompromised populations, including those with diabetes, HIV, or cancer, viral infections like Herpes simplex virus, Cytomegalovirus, and Varicella Zoster virus can also lead to thrombophlebitis
3. Fungal infections: Fungi such as Candida species and Aspergillus are known to cause thrombophlebitis, particularly in immunocompromised individuals
4. Parasitic infections: Parasitic organisms can occasionally be a contributing factor, though this is less common

Risk factors for infectious thrombophlebitis 

Certain risk factors contribute to the development of infectious thrombophlebitis, such as: 

1. Trauma/ Burns
2. IV Drug users²
3. Post-surgical infections³
4. Prolonged hospitalisation
5. Catheter infections²
6. Immunosuppressed people ( HIV, cancer, on chemotherapy, diabetes )
7. Clotting disorders (thrombophilia)

Symptoms 

Inflammations generally induce 4 cardinal symptoms, such as: 

1. Redness over the affected vein
2. Swelling
3. Warmth
4. Pain

Other symptoms which can be related to thrombophlebitis include: 

• Itchiness
• Veins can occasionally look visibly engorged and red. Phlebitis can be more difficult to distinguish on brown and black skin
• In severe cases, one can expect pus and signs of sepsis, like low pressure, rapid breathing, and confusion

Diagnosis

Infectious thrombophlebitis can be diagnosed through a combination of physical examination and patient history, including symptoms and signs. Simple blood tests may be conducted to assess the infection, such as a complete blood count (CBC) and inflammatory markers like ESR and CRP.. More advanced imaging, such as Doppler ultrasound, can help identify the presence of a clot and estimate the extent of the condition. In cases where the clot is deep, CT or MRI scans may be used. Additionally, cultures are required  if a bacterial or fungal infection is suspected.^4,7

Complications

Any disease can be aggravated when medical attention is not sought on time. Some complications that can be related to infectious thrombophlebitis are:⁷ 

1. Sepsis - If the infection is left untreated, it can trigger sepsis, which can be life-threatening as the infection can spread into the bloodstream³
2. Embolism - sometimes the clot can travel to other parts of your body, which can lead to serious problems
3. Chronic venous insufficiency -The long-term consequence is commonly seen in elderly populations, involving an issue in your veins, thus generating a lack of blood flow to the heart. It pools in your leg, leading to chronic venous insufficiency, which induces ulcers or leg swelling
4. Lemierre syndrome - Also known as postanginal septicemia or necrobacillosis, is characterised by bacteremia, internal jugular vein thrombophlebitis, and metastatic septic emboli secondary to acute pharyngeal infections. Modern physicians have "forgotten" this disease⁸

Management 

The management of infectious thrombophlebitis involves a comprehensive approach consisting of:

•  Managing the infection
•  Dissolving the clot
•  Symptomatic management
•  Prevention of further complications

Let's delve a bit deeper into how we can achieve the above-mentioned approach.                                   

1. Managing infections involves targeting the underlying cause of the infection. For bacterial infections, antibiotics are prescribed; mild infections can be treated with oral antibiotics, while more severe cases may require intravenous antibiotics in a hospital setting. For fungal infections, antifungal medications are used. It is crucial to remove the source of infection, such as an infected IV line or catheter, to prevent further complications
2.  Dissolving the clot: blood thinners can be used (needed to start under a doctor’s advice)
3. Symptomatic treatment focuses on relieving discomfort and managing pain. Painkillers such as Paracetamol or Ibuprofen can help alleviate pain, while applying a warm compress can reduce swelling and discomfort

In rare cases, surgery may be considered if the infection spreads rapidly or involves a major vein. However, this is typically reserved for more severe situations.

4. Prevention of complications:
   • Always consult a doctor in case you are presenting with the above symptoms
   • Ensure that if you have been hospitalised for too long that IV lines, catheters are changed by staff when necessary
   • Avoid reusing needles
   • Clean any trauma sites immediately
   • Stay hydrated in order to keep your blood flowing well
   • Change bad lifestyle habits such as smoking
   • Stay active by engaging in regular exercise or stretching 

It’s crucial to get these symptoms checked in case it’s a more serious event, like deep vein thrombosis (a type of blood clot).

You can call 111 or get help from 111 online.

Summary

Infectious thrombophlebitis is the formation of a blood clot in a vein that becomes infected. It can arise from bacterial, viral, fungal, or parasitic infections. Often affects immunocompromised individuals. Common symptoms include redness, swelling, warmth, pain, and in severe cases, pus or signs of sepsis. Risk factors include trauma, IV drug use, post-surgery, and prolonged hospitalisation. Diagnosis involves physical exams, blood tests, and imaging. Treatment includes antibiotics or antifungals, blood thinners, and pain management. Preventive measures-such as adequate catheter care, hydration, and smoking cessation-can help reduce complications, including sepsis or embolism. Early diagnosis is key to effective management.

FAQ’s

Is infectious thrombophlebitis contagious?  

No, infectious thrombophlebitis is not contagious. It is caused by an infection within the body, not through direct transmission from person to person. However, the bacteria, fungi, or viruses causing the infection may be contagious under certain conditions (e.g., if it's a viral or bacterial infection, appropriate precautions should be followed).       

What's the outlook for this condition?

It is generally not harmful if treated early, but delaying can lead to serious complications that require immediate medical attention. 

Does infectious thrombophlebitis need surgery?

Surgery for infectious thrombophlebitis is only necessary in very severe cases. Most instances can be managed with medications and other treatments, so it's vital to seek early medical attention to avoid the need for surgical intervention.