Deep vein thrombosis (DVT) occurs when a blood thrombus forms in a deep vein, most commonly in the lower extremities such as the calf or thigh. During pregnancy and the puerperium, a woman's physiological state changes significantly to protect her from excessive bleeding during delivery. While this hypercoagulable state is a normal evolutionary safeguard, it dangerously predisposes women to abnormal clotting. DVT poses a serious threat to maternal health because the thrombus can detach and travel through the venous system into the pulmonary circulation. Midwives in Nigerian clinical practice must maintain a high index of suspicion, as normal pregnancy discomforts like mild pedal edema can easily mask the early signs of a developing clot.
Virchow's triad outlines the three broad categories of factors that contribute to thrombosis: hypercoagulability, venous stasis, and endothelial injury. Pregnant and postpartum women exhibit all three elements.
The clinical presentation of DVT can range from silent and asymptomatic to intensely painful. Midwives should assess for the classic unilateral signs:
When a midwife or physician suspects DVT, prompt objective testing is necessary to avoid unnecessary or harmful anticoagulant therapy. Clinical judgment alone is insufficient because symptoms mimic normal pregnancy swelling or muscle strains.
The cornerstone of DVT management is anticoagulation therapy to prevent the clot from growing and to reduce the risk of embolization. In pregnant women, low molecular weight heparin (LMWH) is the gold standard because it does not cross the placenta and carries a lower risk of fetal harm compared to oral anticoagulants.
Unfractionated heparin (UFH) may be used if delivery is imminent, as its effects can be rapidly reversed with protamine sulfate. Oral vitamin K antagonists like warfarin are strictly avoided during pregnancy due to teratogenic effects, particularly embryopathy and central nervous system abnormalities during the first trimester. Postpartum women safely transition to warfarin or direct oral anticoagulants if they are not breastfeeding, depending on facility protocols.
The most feared complication of untreated or inadequately managed DVT is pulmonary embolism (PE), which can lead to sudden cardiovascular collapse and maternal mortality. Midwives must remain vigilant for warning signs of PE, including acute dyspnea, pleuritic chest pain, tachypnea, tachycardia, and unexplained apprehension or cyanosis. Early ambulation after childbirth, graduated compression stockings, and prophylactic LMWH for high-risk surgical patients form the bedrock of prevention. Nurses must immediately report any respiratory symptoms in a patient with known or suspected DVT, as clinical deterioration can happen rapidly.
A comprehensive nursing care plan for a patient with DVT focuses on pain relief, monitoring for bleeding complications from anticoagulants, and promoting safe mobility. Midwives should educate the woman and her family on recognizing bleeding gums, unusual bruising, or hematuria while on anticoagulant therapy.
Patients should be instructed to avoid prolonged immobility, perform active ankle exercises during long periods of sitting, and wear prescribed compression stockings correctly. Midwives also provide reassurance and emotional support, as a diagnosis of DVT during the vulnerable postpartum period can cause significant anxiety and interfere with maternal-infant bonding.