Treatment of Left Pectoralis Major Muscle Strain with Intramuscular Hematoma

Initial Assessment and Treatment

Rest and activity modification is included in the conservative protocol for treating pectoralis major muscle strain with intramuscular hematoma, as recommended by Praxis Medical Insights 1
Ice application for acute hematoma management is part of the conservative treatment, as cited in Ca-A Cancer Journal for Clinicians 2
NSAIDs (ibuprofen or acetaminophen) are used for pain control if no contraindications exist, according to Praxis Medical Insights 1
Progressive strengthening once pain subsides is a component of the conservative management, as recommended by Praxis Medical Insights 1

Meticulous hemostasis is critical in the management of hematoma, as changes due to hematoma formation can be difficult to interpret on physical examination and complicate future imaging interpretation, as noted in Ca-A Cancer Journal for Clinicians 2
Avoid routine drain placement unless hematoma formation is a significant concern, and if used, limit to 24 hours, as suggested by Ca-A Cancer Journal for Clinicians 2
Large hematomas may require aspiration or surgical evacuation if causing significant pain or functional limitation, according to Ca-A Cancer Journal for Clinicians 2

The American College of Cardiology recommends immediate evaluation for compartment syndrome signs, such as severe pain disproportionate to examination, pain with passive stretch, paresthesias, pallor, diminished pulses, or weakness, in patients with intramuscular hematomas 3
The American College of Cardiology suggests evaluating for neurological compromise, such as femoral nerve palsy with iliopsoas hematomas, and hemodynamic instability, including tachycardia, hypotension, orthostatic changes, or hemoglobin drop ≥2 g/dL, in patients with intramuscular hematomas 3
The American College of Cardiology advises checking anticoagulation status, including PT/INR for warfarin or specific assays for DOACs, as anticoagulated patients have a significantly higher risk of expansion and complications 3

The American College of Cardiology recommends reversing anticoagulation if life-threatening bleeding or compartment syndrome develops in anticoagulated patients with intramuscular hematomas 3

A firm, “wooden” feel on palpation of the affected muscle is characteristic of deep intramuscular bleeding, even when a discrete mass is not initially palpable. 4
Patients commonly exhibit limited range of motion and muscle spasm in the involved region. 4
Absence of visible surface bruising does not exclude a deep muscle hematoma; clinicians should maintain suspicion when pain is disproportionate to external injury. 4

Mild hematoma – minimal pain, full range of motion preserved, and the individual can continue activity with only slight discomfort. 4
Moderate hematoma – noticeable pain with a 25‑50 % reduction in range of motion and difficulty performing normal activities. 4

Magnetic Resonance Imaging (MRI) without contrast is the most sensitive modality for detecting intramuscular hematomas and delineating the extent of muscle involvement. 5
Ultrasound can demonstrate enlargement and rounding of the affected muscle; Doppler ultrasound achieves 94 % sensitivity and 97 % specificity for identifying pseudoaneurysms, although it cannot differentiate infected from non‑infected hematomas. 6
Computed Tomography (CT) provides rapid diagnosis when MRI is unavailable or contraindicated; contrast‑enhanced CT helps distinguish vascularized tissue from potentially necrotic areas. 7

Individuals with inherited bleeding disorders (e.g., hemophilia) have a markedly increased risk of spontaneous intramuscular hemorrhage. [8][9]10
Evidence strength: The cited studies provide observational data; formal grading of evidence strength was not specified in the source material.