Immobility and Circulatory Health: Risks from DVT to Cardiac Deconditioning

Prolonged immobility (bed rest, casting, paralysis, long travel) triggers a cascade of circulatory deterioration:

Venous Stasis and Thrombosis

• Calf muscle pump inactivation → venous pooling → ↑ venous pressure, capillary leakage, edema.
• DVT risk: Virchow's triad—stasis, endothelial injury, hypercoagulability. PE risk if clot embolizes.
• Prophylaxis: early mobilization, compression stockings, intermittent pneumatic compression, anticoagulants (LMWH, DOACs) per risk stratification.

Orthostatic Intolerance

• Baroreceptor deconditioning → inadequate vasoconstriction on standing → orthostatic hypotension (↓BP >20/10 mmHg), syncope.
• Countermeasures: gradual mobilization, abdominal binders, midodrine, fludrocortisone.

Cardiac Deconditioning

• ↓ Cardiac mass, stroke volume, VO₂ max within days–weeks.
• ↑ Resting heart rate, ↓ exercise capacity.
• Refeeding syndrome risk if nutrition restarted aggressively after prolonged starvation/immobility.

Arterial and Microvascular Effects

• Endothelial dysfunction → reduced NO bioavailability → arterial stiffening.
• Impaired tissue perfusion → pressure injuries, delayed wound healing.
• Insulin resistance from muscle disuse.

Prevention

• Early mobilization (even passive ROM).
• Hydration, nutrition.
• Pharmacologic prophylaxis per guidelines (ACCP, NICE).
• Rehabilitation: progressive resistance, aerobic, functional training.

Every hour of mobility counts—prescribe movement like medication.