Denean Yerger - cdn.ymaws.com · undergoing a two-staged surgery: – Arterial Ilio-Renal Bypass...
Transcript of Denean Yerger - cdn.ymaws.com · undergoing a two-staged surgery: – Arterial Ilio-Renal Bypass...
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Denean Yerger
WVHCS/ University of Scranton School of Nurse Anesthesia
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Case Review/ Analysis Abdominal Aortic Aneurysm
Yerger 2
“AAA”
Incidence Mortality Rupture
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Objectives
• Analyze the preoperative evaluation of a patient undergoing a two-staged surgery: – Arterial Ilio-Renal Bypass – Endovascular Abdominal Aortic Aneurysm Repair
• Describe anesthetic implications of several
comorbidities: Glaucoma, Chronic Obstructive Pulmonary Disease, Alcoholic Cardiomyopathy, Chronic Renal Insufficiency.
• Describe the surgical and anesthetic considerations of both these surgeries.
Yerger 3
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2- Staged Surgery
Ilio-Renal bypass
4 days later
Endovascular AAA Repair
Yerger 4
Complexity Time Surgical Anesthesia Anatomy
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Indication for Surgery
• 7.7 x 8 cm AAA extending into the right common iliac artery
• Congenital anomaly
Yerger 5
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Yerger 6
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Yerger 7
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Yerger 8
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Yerger 9
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Question
• What is the difference between a “true” and “false” aneurysm?
Yerger 10
Vessel Layers Involved
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Yerger 11
True
False
True: bounded by the complete vessel wall False: (pseudoaneurysm) localized dissection (tear) in the inner wall of the artery (Richard E. Klabunde: http://www.cvphysiology.com/Blood%20Pressure/BP019.htm)
www.cvphysiology.com
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Yerger 12
Dissection: separation between the intima and media layer (1)
• A false lumen for blood flow is created
Intramural hematoma is considered a precursor to dissection and is medically treated the same (1)
Barash
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Yerger 13
Classification (anatomical)
Berry Fusiform
Saccular Dissecting
Berry F S D
Richard E. Klabunde www.cvphysiology.com
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Classification of Arterial Aneurysm by Cause
Congenital
Mechanical Inflammatory Infectious Degenerative Anastomosis
Ehlers-Danlos Syndrome
Post-stenotic
Takayasu Disease
Bacterial Nonspecific Post - arteriotomy
Marfan Syndrome
AV fistula associated
Behcet Disease
Fungal Sclerotic arteries
Trauma Kawasaki Disease
Spirochetal Dysplastic
Microvascular disorders
Yerger 14
(Table: Nagelhout & Plaus, 2010, p. 539)
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Physical Exam
Yerger 15
Screening by palpation followed by ultrasound decreases mortality --
• Especially in male smokers > 65 years old (2)
• Male to female ratio = 9:1 (3)
Size of the aneurysm is the MOST important determining factor for rupture! (3)
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Physical Exam
• Periumbilical or abdominal mass with expansile pulsations 3 cm or wider suggests AAA (2)
– Sensitivity to palpation increases as the size increases (2)
• > 4 cm usually palpable = Rupture 15 X’s more likely (2)
• > 5 cm rupture and mortality dramatically increases (3)
• > 5.5 cm surgical intervention recommended (5, p. 530)
Yerger 16
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Risk Factors
Yerger 17
Smoking is the strongest independent risk factor. (3) • 90% of people who develop AAA have
history of smoking (3) Hypertension is present in 60% of patients with aneurysmal lesions. (5)
Genetics may also contribute to the predisposition for development. (5)
Obesity is not an independent risk factor but may mask signs and symptoms until complications arise. (5)
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Pathogenesis
Yerger 18
http://www.billdoll.com/dir/health/q/athero_treat.html
Atherosclerosis – thought to be the primary cause of AAA’s in more than 90% of patients. (5) • This theory has been challenged
Some speculate aneurysmal
development may be the result from proteolysis of elastin and collagen within the vessel wall. (5)
Inflammation and Immune responses (5)
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Pathogenesis
Yerger 19
Development and Progression related to:
Inflammation Degradation of elastin and collagen Thrombus formation Weakening of the arterial wall Distending forces (3, p. 301-310)
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Pathogenesis
As aneurysm grows → tension increases
Yerger 20
Tension = Pressure x Radius
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Medical History
Yerger 21
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Medical history • Arthritis • Gastroesophagel Reflux Disease (GERD) • Glaucoma • Severe Chronic Obstructive Pulmonary Disease
(COPD) • Alcoholic Cardiomyopathy • Hyperlipidemia • Hypertension • Congenital Anomaly • Chronic Renal Insufficiency (CRI)
Yerger 22
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Yerger 23
Glaucoma
Medical History 1.) Glaucoma 2.) COPD 3.) CMO 4.) CRI
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Glaucoma
Yerger 24
Primary open (simple) angle • Chronic • MOST common • Resistance to outflow
Closed angle • Acute • 1/10 as common • Obstruction to outflow
Intraocular pressure 10 – 21.7 mmHg
> 22 mmHg Abnormal
GOAL = minimize ↑ IOP
RISK = optic nerve ischemia • Blindness
Healthdoctrine.com/glaucoma
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Glaucoma – Key Points
• Maintain eye drops
• Avoid venous congestion and overhydration (1)
• Avoid hypotensive episodes (1)
– Prone to retinal vascular thrombosis Scopolamine – do not use in glaucoma (1)
– Greatest mydriatic effect
Yerger 25
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Yerger 26
COPD
Medical History 1.) Glaucoma 2.) COPD 3.) CMO 4.) CRI
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COPD
Yerger 27
Emphysema Bronchitis
Enlargement of air spaces Excessive mucus production Hypertrophy of mucus glands “Reid Index” (13)
The Encyclopedia of Science: Health & Disease uvahealth.com
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COPD – Features
Emphysema (type A) → Pink Puffer Bronchitis (type B) → Blue Bloater
↑ dyspnea over years ↑ dyspnea over years
Little/ no cough Frequent cough with sputum
Marked chest overexpansion Moderate or no ↑ chest volume
No cyanosis Cyanosis
Quiet breath sounds Rales, rhonchi
Normal JVP May have raised JVP
No peripheral edema May have peripheral edema
Slight depressed arterial PO₂ Very low PO₂
Arterial PCO₂ normal ↑ PCO₂
Yerger 28
(Table: West, 2008, p. 61) Cor Pulmonale = COMMON (13)
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COPD • Functional loss of pulmonary capillaries = (5)
Occurs gradually Right ventricle compensation occurs Longstanding COPD: Suspect pulmonary artery hypertension & chronic cor pulmonale – Especially if PaO₂ < 60 mmHg – HYPOXIA = most potent stimulus for pulmonary vasoconstriction
Yerger 29
Arterial hypoxemia
Pulmonary Vasoconstriction
Chronic Cor Pulmonale
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COPD
Preop
Postop Intraop
Yerger 30
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COPD
Yerger 31
Preop Is clinical status optimized? Quit smoking Screen for impending exacerbations Consider: ABX, bronchodilators, postpone Neuraxial anesthesia planned → Sensory anesthesia above T6 not recommended (5) Room Air SpO₂, ABG, Electrolytes PFT’s ? Invasive Monitoring ?
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COPD
Intraop
Yerger 32
Preoxygenation Bronchodilators Inhaled anesthetics may not reverse airflow obstruction, in contrast with asthmatic patients. Avoid Nitrous ABG monitoring Ventilate to Normalize pH
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COPD
Postop
Yerger 33
Extubation Concerns: Bronchospasm Deep extubation = risk of inadequate
ventilation & CO₂ retention Adequate Analgesia: Careful use of narcotics Epidural = reduction in systemic
narcotic requirements Tolerate respiratory regimen
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Yerger 34
Cardiomyopathy Ejection Fraction
Medical History 1.) Glaucoma 2.) COPD 3.) CMO 4.) CRI
(EF)
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Cardiomyopathy
• What exactly is an “Ejection Fraction” ? – Normal EF Range = 60-70%
• EF = (EDV-ESV)/ EDV (x 100)
• EF < 50% = moderate reduction • EF < 30% = poor function
Yerger 35
Stroke Volume
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Cardiomyopathy
Yerger 36
Hypertrophic
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Dilated Cardiomyopathy
Dilated
Nonischemic Ischemic
Yerger 37
Nonischemic: Chemo Agents, Drug Abuse, Alcohol, Peripartum
(12, p. 348)
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Alcoholic Cardiomyopathy
• Proposed Mechanisms: (10)
– Nutritional deficiencies – Secondary exposures – Other comorbidities
• Most evidence in literature = Direct toxic result
of ethanol or its metabolites (10)
• Prognosis: Abstinence (10)
Yerger 38
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Cardiomyopathy
• Presentation of CMO Patients: (12)
– History of CHF/CAD – Medications: furosemide, ACE inhibitors, digoxin,
beta blocker – Cardiomegaly on CXR – ICD/Biventricular pacer (EF < 30%) – Conduction defects on EKG
Yerger 39
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Cardiomyopathy • Profound hypotension caused by: (12)
– ↓ myocardial contractility – ↓ in HR – Vasodilation – Dehydration contributes
• High risk for ventricular arrhythmias • ACE inhibitors + diuretics = hypotension • Correct electrolytes • Optimize Hemoglobin: Major determinants of oxygen
carrying capacity are hemoglobin & cardiac output • Inotropes - (resistant to usual doses)
Yerger 40
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Yerger 41
http://www.cvphysiology.com/Cardiac%20Function/CF024.htm
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Yerger 42
Chronic Renal Insufficiency
(CRI)
Medical History 1.) Glaucoma 2.) COPD 3.) CMO 4.) CRI
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Chronic Kidney Disease
• End Stage Renal Disease (ESRD) – Fatal renal dysfunction without renal replacement therapy
(1)
• Chronic Renal Insufficiency (CRI) (1,5)
– Only 10-40% of nephrons functioning adequately – Radiocontrast exposure
• Decreased Renal Reserve – Loss of nephron function without symptoms
Yerger 43
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Glomerular Filtration Rate (GFR)
• Best measure of overall kidney function (11, p. 861)
• Varies with: age, sex,
body size
Yerger 44
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Glomerular Filtration Rate
Yerger 45
Young healthy adults = 120-130 (11)
45
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Chronic Kidney Disease
• Anesthesia: (1,p. 1356)
– Direct anesthetic effects usually not harmful – Indirect effects that worsen renal dysfunction
• Hypovolemia • Shock • Nephrotoxin exposure • Other renal vasoconstrictive states
• NO comparative studies demonstrating superior
renal protection or improved renal outcomes with general versus regional anesthesia. (1)
Yerger 46
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Chronic Kidney Disease
• Critical Goal in Renal Insufficiency =
Yerger 47
Sustain Blood Volume
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Preoperative Evaluation
Yerger 48
acpinternist.org
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Surgical history
• No major surgery • Cardiac catheterization = No significant
coronary artery disease
Yerger 49
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Preop Eval
Medications Albuterol Beta – 2 agonist
Spiriva Anticholinergic (Bronchodilator)
Xalatan (latanoprost) Prostaglandin agonist
Lisinopril ACE Inhibitor
Coreg Beta & Alpha Blocker
Aspirin Cyclo-oxygenase Inhibitor
Prilosec Proton Pump Inhibitor
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Preop Eval
Labs H&H 16 / 48 (14-18 g/dL) (42%-52%)
BUN/Cr 24/ 1.6 (8-20 mg/dL) (0.2-1.5 mg/dL)
INR 0.95 1
Platelets 86,000 130,000 – 370,000 mm³
K 4.3 3.8 – 5.5 mEq/L
Na 140 135 – 145 mEq/L
Ca 9 4.5 – 5.5 mEq/L
Cl 104 100 – 108 mEq/L
Glucose 102 70-100 mg/dL
CO₂ 30 24 -29 mEq/L
GFR 45 ml/min/1.73m²
Yerger 51
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Preop Eval BMI (1, p. 372)
25-29.9 26 Overweight
30-34.9 Moderate obesity
35-39.9 Severe obesity
40 or greater Morbidly obese
Yerger 52
ASA Classification = 3 “Severe systemic disturbance that limits activity” (1, p. 395)
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Preop Eval
Baseline Vital Signs Fluid Calculations Fluid Requirments (ml)
72 108/77
18 89% room air
98.6
Maintenance • 125 ml/h Deficit • 1500 ml 3rd space losses • 700 ml/h
1st hour = 1500 2nd hour = 1200 3rd hour = 1200 4th hour = 800 TOTAL = 4700 + Blood loss & Urine Replacement
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Preop Eval
• Anticipated difficult airway from assessment? NO
• Bowel prep (NPO) • T & C 2 units PRBCs (available in room) • Right radial A-Line • PIV’s x 3 (16g, 18g, 20g)
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Preop
• Prior to Placement of Epidural: – 1000 mL Lactated Ringer’s Infused – Versed 2 mg, Oxygen
• Epidural placed in T9-10 interspace:
– Test dose Negative – 100 mcg fentanyl given via epidural
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Yerger 56
Ilio-Renal Bypass Graft
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Ilio-Renal Bypass Graft
Yerger 57
Arrival to OR Induction Intubation BP = 86/48 HR = 60 Additional liter crystalloid infused • Total = 2 L
SBP ↑ 105 Phenylephrine • 200 mcg Fentanyl • 50 mcg Propofol • 100mg Norcuron • 10 mg Hemodynamically Stable ABX
Grade I view of glottis 8.5 ETT @ 24 cm OG Esophageal temp probe Albuterol Pressure Control Ventilation (PCV) • PIP = 21
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Right - Lateral
Yerger 58
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Ilio-Renal Bypass Graft
Yerger 59
5 Hours
Maintenance Epidural Isoflurane PCV: TV 515-715 ml SpO₂ 98% FiO₂ 0.80 Norcuron Heparin 5000 units Phenylephrine Ephedrine • Maintain SBP > 100 mmHg Protamine 25 mg
Fentanyl 100 mcg Marcaine 0.25% • Total = 9 ml
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Ilio-Renal Bypass Graft
• Emergence
Extubate ??
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Emergence • COPD diagnosis = twice as likely to have postoperative
pulmonary complications (9)
• Risk factors that ↑ risk: (8,9)
– Preop sepsis – Emergency operations – > 60 years old – Smoking history – Comorbid diseases (ASA III or greater) – Chronic bronchitis – Obesity – Type of surgery (abdominal/ thoracic) – Prolonged surgery > 3-4 hours
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Ilio-Renal Bypass Graft
Emergence Extubation Hemodynamically Stable Reversal Neostigmine Robinul
Adequate signs of reversal Extubated without difficulty 10 L NRB Mask Transported to PACU
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Ilio-Renal Bypass Graft
PACU Intake/ Output HR = 89 NSR BP = 112/52 Normothermic SpO₂ = 99% NRB Changed to NC Awake, appropriate Strength strong Respirations regular & unlabored No pain
Crystalloid = 6400 ml Cell Saver = 225 ml Urine Output = 835 ml EBL = 1300 ml
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Postop Day 1
• Fluid Challenges Maintain SBP 100–120 mmHg HR = 80 NSR
• 95% on 3L NC – 18 bpm • Ileus
– Nauseous – Abdomen distended – NG placed
• Epidural intact
Yerger 64
Lab Value H&H 11.6 / 35 Platelets ↓ 61,000 Bun/ Cr 21 / 1.1
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Postop Day 4
Endovascular Abdominal Aortic Aneurysm Repair (EVAR)
Yerger 65
http://www.uchospitals.edu/specialties/vascular-surgery/aaa-repair.html#P26_3350
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Open Versus EVAR
Yerger 66
Open Repair Endovascular
Incision • Transperitoneal • Retroperitoneal ♦ Aorta Crossclamped • Hemodynamic Instability
Incision • Cut down femoral arteries Guide Wire: Iliac Artery Fluoroscopy
Pictures: http://www.uchospitals.edu/specialties/vascular-surgery/aaa-repair.html#P26_3350
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EVAR
Advantages: (6,7)
• Improved hemodynamic stability
Embolic issues Blood loss Stress response Renal dysfunction Postop pain Incidence of spinal cord ischemia (1)
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EVAR
• Patient Eligibility: (1)
– Shape of aneurysm – Feasibility of femoral or iliac arteries – Compensate for vascular exclusion of the aortic
branches that will not be supplied once the stent graft is in place
• Hypogastric • Inferior mesenteric • Artery of Adamkiewicz
Yerger 68
Postop ?? • Lactic acidosis • Diffuse abdominal/pelvic pain
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EVAR – Case Card (4)
• General/ Epidural/ Spinal/ Local with sedation • Supine Time: 1-3 hours Aortogram • 14-16 g IV x 2 A-line Kefzol • PRBC’s available EBL: Minimal • Pain: 3-4 Mortality: 2-3% • Induction: Standard • Emergence: Extubation desirable • ICU: x 1 day • Prior to catheter manipulation: Heparin 50-100 units/kg • Stent deployment: ↓ MAP 50-60 mmHg
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EVAR
• Goals for Intraoperative Management:
– Hemodynamic Stability – Analgesia – Anxiolysis
– Preparation for rapid conversion to open
technique
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EVAR • Intraop Concerns:
– Regional: Sympathectomy = Anticipate ↓ BP
– Cardiac Ischemia
– Cerebrovascular Disease: BP 10-15% baseline
– Hemorrhage: Persistent drops in BP or Hct out of
proportion to EBL
– Protamine
Yerger 71
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EVAR
• Potential postoperative complications: (1, p. 545)
– Graft & Deployment (Endoleaks) – Radiologic implications
• Contrast injection – Renal Insufficiency
– Systemic • Cardiac Morbidity • Pulmonary Insufficiency • Renal Insufficiency
Yerger 72
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Endoleak
Yerger 73
• 4 Types (1, p. 546)
• Type I • Type II: Branch leak • Type III • Type IV
Implantathttp://www.ajronline.org/content/192/4/W178/F2.expansion.html
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Endoleak
Yerger 74
http://www.uptodate.com/contents/image?imageKey=CARD%2F3263&topicKey=SURG%2F8185
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Medical History
• Arthritis • GERD • Glaucoma • COPD • Cardiomyopathy • Hyperlipidemia • Hypertension • Chronic Renal Insufficiency
Yerger 75
Ilio-Renal Bypass Surgery Large incision Ileus Respiratory insufficiency Epidural catheter
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EVAR – Preop POD #1 POD #4 (preop)
H&H 11.6 / 35 10.9 / 31.9
Na 140 139
K 3.9 4.2
BUN/ Cr 21 / 1.1 18 / 0.9
Platelet 61,000 81,000
Yerger 76
Assessment Epidural → Fentanyl 5mcg/mL + Ropivacaine 0.1% (6 mL/ hour) NG
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EVAR
Arrival to OR Induction Intubation BP = 138/70 (A-line) HR = 86 SpO₂ = 93% on 4L NC
Fentanyl • 50 mcg Propofol • 100 mg Zemuron • 50 mg Hemodynamically Stable ABX Epidural
8.0 ETT @ 23 cm NG Esophageal temp probe Pressure Control Ventilation (PCV) • PIP = 26
Yerger 77
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EVAR
Yerger 78
3 hours, 40 minutes
Maintenance Epidural Desflurane PCV: TV 550 SpO₂ 98-100% FiO₂ 0.50 Zemuron Heparin 10,000 units Phenylephrine gtt • Maintain SBP 110-120 HR 60-90 bpm Protamine 50 mg
Same Infusion
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EVAR
Intake/ Output Crystalloid = 1900 ml Cell Saver = 225 ml Urine Output = 1125 ml EBL = 550 ml
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EVAR
• Emergence
Extubate ??
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EVAR
Emergence Extubation Hemodynamically Stable Reversal Neostigmine Robinul
Adequate signs of reversal Extubated to 10 L NRB Mask • Immediate ↓ SpO₂ • Poor Inspiratory Effort/ Weak PPV from Mask = ↑ SpO₂ Transported to PACU on NRB 100%
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EVAR
PACU Vital Signs Airway HR = 108 BP = 131/62 Normothermic SpO₂ = low 90’s SpO₂ ↓ Weak/ Poor Inspiratory Effort
SpO₂ ↓ Weak Inspiratory Effort Lethargic Bipap applied • Result = ↑ SpO₂ 95% Reintubated Transferred to ICU
Yerger 82
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POD #1 LAB Value
WBC 6.8
H&H 10.3 / 30.6
Platelets 74,000
Na/ K 138 / 4.4
Bun/Cr 20 / 1
Yerger 83
Pt extubated early → Did well on nasal cannula Epidural DC’d → Pain management = IV PCA NG removed OOB, eating
Transferred to floor
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Summary
Yerger 84
Anesthesia
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References References marked with an asterisk indicate studies included in the reference book. 1. Barash, P.G., Cullen, B.F., Stoelting, R.K., Cahalan, M.K., & Stock, M.C. (Eds.). (2009). Clinical anesthesia (6th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
2. Bickley, L.S., & Szilagyi, P.G. (2009). Lynn S. Bickley Bates’ Guide to physical examination and history taking (10th ed.). Philadelphia, PA: Wolters Kluwer Health/ Lippincott Williams & Wilkins.
3. Elisha, S. (Ed.). (2011). Case studies in nurse anesthesia. Sudbury, MA: Jones and Bartlett.
4. Jaffe, R.A., & Samuels, S.I. (Eds.). (2009). Anesthesiologists manual of surgical procedures (4th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
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References 5. Nagelhout, J.J., & Plaus, K.L. (2010). Nurse anesthesia (4th ed.). St. Louis, Missouri: Saunders Elsevier. *6. Boyle, J.R., et al., (2000). Endovascular AAA repair attenuates the inflammatory and renal responses associated with conventional surgery. Journal of Endovascular Therapy, 7, 359-371. *7. Carpenter, J.P., et al., (2002). Durability of benefits of endovascualar versus conventional abdominal aortic aneurysm repair. Journal of Vascular Surgery, 35, 222-228. *8. Johnson, R.G., et al., (2007). Multivariable predictors of postoperative respiratory failure after general and vascular surgery: results from the patient safety in surgery study. Journal of the American College of Surgeons, 204, 1188-1198. *9. Smetana, G.W., et al., (2006). Preoperative pulmonary evaluation: identifying and reducing risks for pulmonary complications. Cleveland Clinic Journal of Medicine, 73, 36-41. Yerger 86
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References 10. Popjes, E.D. (2011, June 20). Alcoholic cardiomyopathy. Medscape Reference: Drugs, Diseases & Procedures. Retrieved from http://emedicine.medscape.com/article/152379-overview
11. Porth, C.M. & Matfin, G. (2009). Pathophysiology concepts of altered health states (8th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
12. Thiagarajah, P.H., Thiagarajah, S., & Frost, E.A. (2009). Anesthetic considerations in patients with cardiomyopathies: A review. Middle East Journal of Anesthesiology, 20, 347-354.
13. West, J.B. (2008). Pulmonary pathophysiology: The essentials (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins, A Wolters Kluwer business.
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Thank you
Yerger 88