Abdominal Aortic Aneurysm (AAA)
EM Note
5,454 views
Homepage: EMNote.org ■
🚩Membership: https://tinyurl.com/joinemnote
🚩ACLS Lecture: https://tinyurl.com/emnoteacls
Abdominal Aortic Aneurysm (AAA)
Case Presentation
Patient Profile:
68-year-old male
Severe left-sided loin-to-groin pain (1-hour duration)
No urinary or bowel symptoms
Comorbidities:
Hypertension, diabetes mellitus, chronic obstructive pulmonary disease (COPD)
Lifestyle Factors:
Smoker (20 cigarettes/day)
Alcohol consumption: 30–40 units/week
Examination Findings
Vital Signs:
Temperature: 35.9°C
Pulse: 115 beats per minute
Blood pressure: 89/48 mmHg
Respiratory rate: 24 breaths per minute
Oxygen saturation: 94% on room air
Abdominal Exam:
Distended abdomen
Diffusely tender
Pulsatile mass in the upper abdomen
Diagnosis
Definition of AAA:
Dilatation of the abdominal aorta greater than 50% of normal diameter (above 3 cm)
Classic Presentation Triad:
Abdominal pain
Pulsatile abdominal mass
Hypotension
Key Risk Factors:
Age above 65 years
Smoking
Hypertension, COPD, family history
Investigations
Point-of-Care Ultrasound:
Rapid, non-invasive
Confirms presence/absence of AAA
Limitations: Cannot reliably rule out leaks; obscured by obesity or bowel gas
Gold Standard: Contrast-Enhanced CT Scan:
Sensitivity: Nearly 100%
Provides detailed information about size, location, and complications
Permissive Hypotension
Definition:
Avoid aggressive fluid resuscitation
Goal:
Maintain lowest systolic blood pressure ensuring vital organ perfusion (~ 90 mmHg)
Rationale:
Higher blood pressure increases vessel wall tension and bleeding risk
Management
Immediate Actions:
Place patient in resuscitation room
Insert two 14G cannulae
Draw blood for:
Full blood count
Renal function tests
Coagulation profile
Cross-match at least 6 units of blood
Management
Activate Major Transfusion Protocol if:
Systolic BP less than 90 mmHg
Heart rate above 110 bpm
Prepare for Procedures:
Urinary catheterization
Arterial line placement
Central venous access
Fluid Resuscitation and Pain Control
Fluid Resuscitation:
Use packed red blood cells as first-line agent
Avoid excessive fluid administration to prevent worsening of leaks
Pain Control:
Administer intravenous morphine
Reduces wall tension and cardiac contraction
Surgical Referral and Intervention
Urgent Referral to Vascular Surgeon:
Ruptured AAA has 100% mortality if not repaired immediately
Treatment Options:
Open surgery: Direct repair
Endovascular aneurysm repair (EVAR): Minimally invasive stent insertion
Indications for Repair:
Male: AAA more than 5.5 cm
Female: AAA more than 5 cm
Rapid growth: more than 1 cm/year
Asymptomatic AAA Management
Monitoring Requirements:
Regular ultrasonography for asymptomatic AAAs measuring 2–5.5 cm
Outpatient follow-up with vascular surgery
Key Takeaways
Ruptured AAA:
Surgical emergency with 100% mortality if untreated
Risk Factors:
Age above 65 years, smoking, hypertension, COPD
Diagnostic Tools:
Point-of-care ultrasound
Contrast-enhanced CT scan
Management Goals:
Permissive hypotension (~ 90 mmHg systolic)
Urgent referral to vascular surgeon
6 Comments
Abdominal Aortic Aneurysm (AAA)
EM Note
5,454 views
Homepage: EMNote.org ■
🚩Membership: https://tinyurl.com/joinemnote
🚩ACLS Lecture: https://tinyurl.com/emnoteacls
Abdominal Aortic Aneurysm (AAA)
Case Presentation
Patient Profile:
68-year-old male
Severe left-sided loin-to-groin pain (1-hour duration)
No urinary or bowel symptoms
Comorbidities:
Hypertension, diabetes mellitus, chronic obstructive pulmonary disease (COPD)
Lifestyle Factors:
Smoker (20 cigarettes/day)
Alcohol consumption: 30–40 units/week
Examination Findings
Vital Signs:
Temperature: 35.9°C
Pulse: 115 beats per minute
Blood pressure: 89/48 mmHg
Respiratory rate: 24 breaths per minute
Oxygen saturation: 94% on room air
Abdominal Exam:
Distended abdomen
Diffusely tender
Pulsatile mass in the upper abdomen
Diagnosis
Definition of AAA:
Dilatation of the abdominal aorta greater than 50% of normal diameter (above 3 cm)
Classic Presentation Triad:
Abdominal pain
Pulsatile abdominal mass
Hypotension
Key Risk Factors:
Age above 65 years
Smoking
Hypertension, COPD, family history
Investigations
Point-of-Care Ultrasound:
Rapid, non-invasive
Confirms presence/absence of AAA
Limitations: Cannot reliably rule out leaks; obscured by obesity or bowel gas
Gold Standard: Contrast-Enhanced CT Scan:
Sensitivity: Nearly 100%
Provides detailed information about size, location, and complications
Permissive Hypotension
Definition:
Avoid aggressive fluid resuscitation
Goal:
Maintain lowest systolic blood pressure ensuring vital organ perfusion (~ 90 mmHg)
Rationale:
Higher blood pressure increases vessel wall tension and bleeding risk
Management
Immediate Actions:
Place patient in resuscitation room
Insert two 14G cannulae
Draw blood for:
Full blood count
Renal function tests
Coagulation profile
Cross-match at least 6 units of blood
Management
Activate Major Transfusion Protocol if:
Systolic BP less than 90 mmHg
Heart rate above 110 bpm
Prepare for Procedures:
Urinary catheterization
Arterial line placement
Central venous access
Fluid Resuscitation and Pain Control
Fluid Resuscitation:
Use packed red blood cells as first-line agent
Avoid excessive fluid administration to prevent worsening of leaks
Pain Control:
Administer intravenous morphine
Reduces wall tension and cardiac contraction
Surgical Referral and Intervention
Urgent Referral to Vascular Surgeon:
Ruptured AAA has 100% mortality if not repaired immediately
Treatment Options:
Open surgery: Direct repair
Endovascular aneurysm repair (EVAR): Minimally invasive stent insertion
Indications for Repair:
Male: AAA more than 5.5 cm
Female: AAA more than 5 cm
Rapid growth: more than 1 cm/year
Asymptomatic AAA Management
Monitoring Requirements:
Regular ultrasonography for asymptomatic AAAs measuring 2–5.5 cm
Outpatient follow-up with vascular surgery
Key Takeaways
Ruptured AAA:
Surgical emergency with 100% mortality if untreated
Risk Factors:
Age above 65 years, smoking, hypertension, COPD
Diagnostic Tools:
Point-of-care ultrasound
Contrast-enhanced CT scan
Management Goals:
Permissive hypotension (~ 90 mmHg systolic)
Urgent referral to vascular surgeon