What Does Microcirculation Refer To?
Microcirculation refers to the network of the body’s smallest blood scale, arterioles and venules—which is responsible for delivering oxygen and nutrients directly to tissues and cells.
While the larger vessels act as the main transport network for blood, the microcirculation represents the “last mile”, where the actual exchange of gases, nutrients and metabolic waste products takes place at cellular level.
Microcirculatory dysfunction is a common pathophysiological mechanism in a wide range of conditions, including diabetes mellitus, atherosclerosis, Raynaud’s syndrome, systemic lupus erythematosus, scleroderma and radiation-induced tissue disorders.
The consequence is consistently the same: cells receive less oxygen and fewer nutrients than they require, leading to impaired function, delayed healing or tissue injury.
Characteristics of Microcirculation
Microcirculation is highly sensitive to a range of harmful factors, including inflammation, hypoxia, oxidative stress, hyperglycemia and nicotine.
In pathological conditions, capillaries may develop thickening of the basement membrane, reduced elasticity and increased permeability. These changes significantly impair their ability to facilitate effective exchange between the blood and surrounding tissues.
An important characteristic of the microcirculation is its considerable plasticity. Unlike large blood vessels, in which advanced atherosclerotic changes are difficult to reverse, capillaries can remodel, regenerate and improve their function in response to appropriate biological stimuli.
This plasticity is why improving microcirculatory function represents an achievable therapeutic objective.
Scientific Research
Studies evaluating the effects of hyperbaric oxygen therapy on microcirculation have reported significant improvements in blood rheology, capillary elasticity and vascular permeability.
The reduction of oxidative stress, one of the principal causes of microvascular impairment, is among the most important mechanisms through which hyperbaric oxygen therapy may improve microcirculatory function.
In addition, the stimulation of neovascularisation associated with hyperbaric oxygen therapy involves not only the formation of new blood vessels, but also functional improvements in existing capillaries.
Studies using optical microscopy to examine tissue capillaries have demonstrated an increased density of functioning capillaries following a course of hyperbaric oxygen therapy.
The Role of Hyperbaric Oxygen Therapy
Improving microcirculation is one of the principal mechanisms through which hyperbaric oxygen therapy benefits a wide range of vascular conditions.
It is not a secondary effect. Rather, it is the link that explains how the overall improvement in oxygenation achieved within the chamber translates into clinical benefits at tissue level.
During each session, increased blood oxygen tension improves blood rheology, meaning the ease with which blood flows through the capillaries. This reduces the tendency towards thrombosis and improves oxygen delivery at cellular level.
Between sessions, the stimulation of antioxidant enzymes provides longer-term protection to the capillaries against oxidative stress.
Overall, the repeated cycle of hyperoxygenation and enhanced antioxidant defence produced by hyperbaric oxygen therapy acts as a form of biological maintenance for microcirculation, progressively improving its function over time.
The treatment course is individually tailored and typically consists of 20 to 40 sessions, planned in collaboration with the vascular specialist.