Chronic Venous Insufficiency (CVI): Symptoms, Causes and Management in the UK

Chronic Venous Insufficiency (CVI) is a long-term medical condition where the veins in the legs are unable to pump blood efficiently back to the heart. In a healthy circulatory system, tiny valves within the veins ensure that blood flows in one direction—upwards. When these valves become damaged or weakened, blood can pool in the lower legs, a process known as venous stasis.

In the UK, CVI is a common chronic condition, particularly among older adults, those with a history of Deep Vein Thrombosis (DVT), and individuals who spend long periods standing or sitting. Over time, the increased pressure (venous hypertension) causes fluid to leak into the surrounding tissues, leading to the characteristic swelling and skin changes associated with the condition.

The symptoms of CVI often develop gradually and may worsen throughout the day, especially if you have been on your feet. According to NICE (National Institute for Health and Care Excellence) guidelines, clinicians look for several key indicators:

• Oedema: Swelling in the lower legs and ankles, which often improves after a night’s sleep.
• Heavy or Aching Legs: A persistent dull ache or a feeling of heaviness, particularly after standing.
• Skin Changes: The skin may become discoloured (brownish or reddish), itchy, or thickened. This is often referred to as varicose eczema or stasis dermatitis.
• Varicose Veins: Visible, twisted, or bulging veins on the surface of the legs.
• Leg Cramps: Sudden tightening of the leg muscles, often occurring at night.

Understanding why CVI develops is crucial for effective management. The primary cause is high pressure within the leg veins, which damages the delicate valves. Several factors increase your likelihood of developing CVI in the UK:

• Age and Genetics: The risk increases as we get older, and a family history of varicose veins or CVI is a significant factor.
• Previous DVT: A past blood clot in the leg can permanently damage vein valves (post-thrombotic syndrome).
• Obesity: Carrying excess weight puts significantly more pressure on the veins in the lower body.
• Pregnancy: Hormonal changes and increased blood volume can strain the venous system.
• Occupational Factors: Jobs that require prolonged standing (e.g., retail or healthcare) or sitting (e.g., office work) hinder the 'calf muscle pump' that assists blood flow.

Management of CVI focuses on reducing venous pressure and preventing complications like ulcers. NHS guidance typically recommends a combination of lifestyle modifications and compression therapy.

Compression Therapy

Compression stockings are the cornerstone of CVI management. These specially designed socks apply pressure to the lower legs, helping the vein valves function better and encouraging blood flow towards the heart. It is essential to be measured correctly by a healthcare professional to ensure the right grade of compression is used.

Lifestyle Adjustments

• Leg Elevation: Elevating your legs above the level of your heart for 30 minutes, three to four times a day, can significantly reduce swelling.
• Regular Exercise: Activities like walking or swimming strengthen the calf muscles, which act as a pump for the veins.
• Weight Management: Reducing body weight can alleviate the pressure on your circulatory system.
• Skin Care: Keeping the skin on the legs moisturised prevents cracking and reduces the risk of infection (cellulitis).

If you are experiencing persistent leg swelling, skin discolouration, or discomfort, it is important to seek medical advice. CVI is a progressive condition, and early intervention can prevent it from worsening into more serious stages, such as venous leg ulcers.

You may choose to speak to a GP online for a convenient initial assessment. An online GP can review your symptoms, discuss your medical history, and provide guidance on lifestyle changes. They can also advise on whether you need a physical examination to check your peripheral pulses or if you require a referral to a vascular specialist for a Duplex ultrasound scan. If you need a sick note due to severe symptoms affecting your ability to work, an online GP service can also assist with this documentation.

Ignoring the early signs of venous insufficiency can lead to long-term complications that are much harder to treat. These include:

• Venous Leg Ulcers: These are chronic sores that form, usually near the ankle, due to poor circulation. They can be painful and take months to heal.
• Cellulitis: A bacterial skin infection that occurs more easily when the skin is stretched and damaged by fluid.
• Lipodermatosclerosis: A condition where the skin and the fat underneath become hardened and inflamed, often causing the lower leg to look like an 'inverted champagne bottle'.
• Deep Vein Thrombosis (DVT): While CVI itself is not DVT, the sluggish blood flow associated with it can increase the risk of clots forming.