What review of systems should be performed for an inpatient on warfarin who presents with dizziness?

Review of Systems for Inpatient Dizziness on Warfarin

For an inpatient on warfarin presenting with dizziness, immediately check the INR and perform a focused review of systems targeting bleeding complications, with particular attention to signs of intracranial hemorrhage, gastrointestinal bleeding, and orthostatic hypotension.

Immediate Laboratory Assessment

• Check INR immediately - this is the single most critical test, as supratherapeutic INR is the most significant factor in warfarin-related adverse events 1
• Target therapeutic range is INR 2.0-3.0 for most indications 2
• INR should be monitored at least weekly during initiation and monthly when stable 3, 4, 3

Critical Bleeding-Related Review of Systems

Neurological (Highest Priority - Intracranial Hemorrhage)

• Headache - new onset, severe, or different from baseline
• Altered mental status - confusion, drowsiness, or decreased level of consciousness
• Focal neurological deficits - weakness, numbness, speech changes, vision changes
• Seizures - new onset

Rationale: Warfarin-associated intracranial hemorrhage carries the highest morbidity and mortality risk and requires emergency reversal 5. Elderly patients (≥60 years) exhibit greater PT/INR response and increased hemorrhage risk 2.

Gastrointestinal

• Melena (black, tarry stools) or hematochezia (bright red blood per rectum)
• Hematemesis or coffee-ground emesis
• Abdominal pain
• Nausea (common warfarin side effect) 1

Genitourinary

• Hematuria - gross or microscopic
• Flank pain

Dermatologic/Mucosal

• Ecchymosis (bruising) - extent and location
• Petechiae
• Gingival bleeding or bleeding from oral mucosa
• Epistaxis

Cardiovascular (Orthostatic Component)

• Presyncope or syncope
• Palpitations - assess for atrial fibrillation rate control
• Chest pain
• Orthostatic vital signs - measure blood pressure and heart rate supine and standing

Medication-Related Assessment

• Recent warfarin dose changes - INR monitoring is essential during dose adjustments 6
• New medications - particularly antibiotics, NSAIDs, or other drugs that interact with warfarin 3
• Dietary changes - vitamin K intake
• Alcohol consumption
• Medication adherence

Additional Pertinent Systems

Vestibular/ENT (if bleeding excluded)

• Vertigo - room-spinning sensation
• Hearing changes or tinnitus
• Recent upper respiratory infection

Constitutional

• Fever - may indicate infection affecting INR
• Weight changes
• Fatigue or weakness

Physical Examination Priorities

1. Vital signs with orthostatics - blood pressure drop >20 mmHg systolic or >10 mmHg diastolic suggests volume depletion from bleeding
2. Neurological examination - mental status, cranial nerves, motor/sensory function, cerebellar testing
3. Skin examination - look for ecchymosis, petechiae, or other bleeding manifestations
4. Abdominal examination - tenderness, distension, masses
5. Rectal examination - assess for melena or gross blood

Common Pitfalls to Avoid

• Do not wait for INR results if intracranial hemorrhage is suspected - initiate reversal immediately based on clinical suspicion 5
• Do not dismiss dizziness as benign in warfarin patients - it may be the presenting symptom of serious bleeding 1
• Do not assume therapeutic INR excludes bleeding - bleeding can occur even with therapeutic anticoagulation 7
• Elderly patients require heightened vigilance - they exhibit greater anticoagulant response and increased bleeding risk 2

Risk Stratification

High-risk features requiring urgent intervention:

• INR >5
• Any neurological symptoms
• Evidence of active bleeding
• Hemodynamic instability
• Recent trauma or fall

Moderate-risk features:

• INR 3.0-5.0
• Significant orthostatic symptoms
• Multiple minor bleeding manifestations

This systematic approach prioritizes life-threatening bleeding complications while maintaining appropriate vigilance for other causes of dizziness in the anticoagulated patient.