What assessment and plan should be made for an 84‑year‑old woman with coronary artery disease (CAD) status post stent, hypertension (HTN), Barrett’s esophagus status post Nissen fundoplication, prior cervical cancer, chronic spinal stenosis pain, recent right humeral fracture, diverticulosis with previously treated colonic arteriovenous malformations (AVMs), presenting after multiple falls due to fatigue and back pain, now with acute on chronic microcytic anemia (severe anemia), mild rectal bleeding, constipation on imaging, and prior colonoscopy showing treated AVMs and hemorrhoids and prior esophagogastroduodenoscopy (EGD) showing Barrett’s esophagus?

Assessment and Plan for Acute on Chronic Microcytic Anemia with Suspected GI Blood Loss

Assessment

This 84-year-old woman has acute on chronic microcytic anemia (hemoglobin dropped from baseline 10-12 to nadir 6.1) most likely from lower GI bleeding secondary to previously documented colonic arteriovenous malformations (AVMs), with hemorrhoidal bleeding as a contributing factor. 1

Primary Differential Diagnosis

• Colonic AVMs (most likely): Patient has documented history of four AVMs in ascending colon and cecum treated with heater probe in prior colonoscopy; AVMs are a significant cause of chronic, intermittent lower GI bleeding in elderly patients and can rebleed after initial treatment 1
• Hemorrhoidal bleeding: Relative reports mild rectal bleeding attributed to hemorrhoids; internal hemorrhoids were documented on prior colonoscopy
• Diverticular bleeding: CT shows extensive diverticulosis, though no active diverticulitis
• Upper GI source (less likely): Barrett's esophagus without dysplasia on prior EGD; chronic gastritis (H. pylori negative); however, no melena or hematemesis reported

Risk Factors for Ongoing Bleeding

• Advanced age (82 years) with multiple comorbidities including CAD status post stent
• Antiplatelet therapy (likely on aspirin or other agents given CAD with stent)
• History of treated but multiple AVMs that carry risk of rebleeding 1
• Severe constipation on imaging may contribute to hemorrhoidal bleeding

Barrett's Esophagus Considerations

• Patient has Barrett's esophagus status post Nissen fundoplication without dysplasia on most recent EGD
• Endoscopic surveillance is mandatory even after fundoplication, as the risk of adenocarcinoma is not eliminated by surgical intervention 2
• For Barrett's without dysplasia, surveillance endoscopy should occur every 3-5 years for short segments (<3 cm) or every 2-3 years for long segments (≥3 cm) 3
• Patient should remain on daily proton pump inhibitor therapy 3

Plan

Immediate Management (Inpatient)

Hemodynamic Stabilization

• Transfuse packed red blood cells for hemoglobin <7 g/dL to maintain adequate oxygen delivery given CAD history 4
• Current hemoglobin 7.7 after 1 unit PRBC with appropriate response; continue close monitoring with CBC every 6-8 hours
• Maintain two large-bore IV access
• Type and crossmatch for additional units

Medication Review

• Review and hold antiplatelet agents (aspirin, clopidogrel) temporarily given active bleeding, balancing against CAD stent thrombosis risk; consult cardiology if stent placed within past 12 months 4
• Avoid NSAIDs completely
• Continue PPI therapy (should be on at least daily dosing for Barrett's esophagus) 3

Bowel Preparation

• Aggressive bowel regimen to clear constipation and optimize visualization for colonoscopy
• Polyethylene glycol-based preparation preferred once hemodynamically stable

Diagnostic Evaluation

Colonoscopy (Urgent, within 24-48 hours once stabilized)

• Colonoscopy is the definitive diagnostic and potentially therapeutic procedure for suspected lower GI bleeding from AVMs 1
• Target visualization and treatment of AVMs in ascending colon/cecum (previously documented locations)
• Assess hemorrhoids for active bleeding
• Evaluate diverticula for stigmata of recent hemorrhage
• Obtain biopsies only if mucosal lesions identified; avoid random biopsies in setting of active bleeding

Pre-Colonoscopy Cardiac Risk Stratification

• Patient experienced ventricular tachycardia during prior colonoscopy attempt
• Cardiology consultation mandatory before repeat procedure given CAD, recent arrhythmia, and anemia 4
• Consider telemetry monitoring during procedure
• Optimize beta-blocker therapy if not contraindicated

Alternative Imaging if Colonoscopy Contraindicated

• If patient deemed too high-risk for colonoscopy due to cardiac instability, consider contrast-enhanced CT during suspected active bleeding episode to localize vascular source 1
• CT angiography can visualize vascular dilatation and contrast extravasation, particularly useful in critically ill elderly patients 1
• Digital subtraction angiography reserved for cases where CT and endoscopy are non-diagnostic or contraindicated

Endoscopic Treatment Options

If AVMs Identified

• Heater probe coagulation (previously used successfully in this patient)
• Argon plasma coagulation as alternative
• Consider hemoclipping for actively bleeding lesions
• Multiple AVMs may require staged treatment sessions

If Hemorrhoids Identified as Source

• Rubber band ligation for internal hemorrhoids
• Infrared coagulation for smaller lesions

Outpatient Follow-Up Plan

Barrett's Esophagus Surveillance

• Schedule surveillance EGD based on segment length: every 3-5 years for short segment (<3 cm) or every 2-3 years for long segment (≥3 cm) 3
• Use high-definition white light endoscopy with Prague classification documentation 3
• Obtain 4-quadrant biopsies every 2 cm throughout Barrett's segment (Seattle protocol) 3
• Continue daily PPI therapy indefinitely 3
• Any dysplasia detected must be confirmed by second expert GI pathologist 3

Post-Nissen Fundoplication Monitoring

• Patient has Barrett's esophagus status post Nissen fundoplication
• Fundoplication does not eliminate cancer risk; continued surveillance is mandatory 2
• Monitor for fundoplication failure symptoms (recurrent heartburn, dysphagia, regurgitation)

Anemia Management

• Resume outpatient IV iron infusions once acute bleeding controlled
• Target hemoglobin >10 g/dL given CAD history
• Monitor CBC every 2-4 weeks initially, then monthly once stable

Colonoscopy Surveillance After AVM Treatment

• Repeat colonoscopy in 6-12 months to assess for AVM recurrence or new lesions 1
• AVMs can be multiple and recurrent; ongoing surveillance required

Common Pitfalls to Avoid

• Do not delay colonoscopy once patient is hemodynamically stable; AVMs require direct visualization and treatment 1
• Do not discontinue Barrett's surveillance after fundoplication; adenocarcinoma risk persists 2
• Do not obtain random biopsies during acute bleeding; focus on targeted biopsies of visible lesions only
• Do not restart antiplatelet therapy without cardiology input, especially if recent stent placement 4
• Do not attribute all bleeding to hemorrhoids in elderly patients with known AVMs; colonoscopy to cecum is mandatory 1

Prognosis and Patient Counseling

• AVMs are a chronic condition with risk of recurrent bleeding requiring repeat interventions 1
• Barrett's esophagus carries 0.5% annual risk of progression to adenocarcinoma; adherence to surveillance protocol is critical 4
• Given multiple comorbidities (CAD, chronic pain, recent fracture), goals of care discussion may be appropriate regarding invasive interventions