Anesthesia and Cancer Flashcards
What does cancer result from?
- Accumulation of genetic mutations that causes dysregulation of cellular proliferation (alteration in DNA structure)
- inherited traits
- mutaiton of normal gene into an oncogene
- inactivation of tumor suppressor gene (p53)
- Fundamental cellular event in malignancy: alteration in DNA structure
- immune surveillance destroys many malignant cells
- HIV/immunosuppressant disrupt protective mechanism
- Most cancers produce solid tumors
What does TNM stand for?
tumor
nodes
metastatic disease
What carincogens are estimated to be responsible for 80% of cancers in the United States?
- Tobacco
- alcohol
- sunlight
Most common cancers?
- Prostate (men), breast (women)
- lung #2 in both male/female (leading cause of death)
- Colon Ca 2nd leading cause of death
What are some pathological changes in the hematologic system with cancer?
- Anemia
- bone marrow suppression
- GI ulceration and anemia due to invasion
- Neutropenia- decrease WBC
- Thrombocytopenia
- hypercoagulable state; risk of thromboembolic events
- Hypercalcemia
Pathological effects of cancer on neuromuscular system?
- myofascial pain and peripheral neuropathies
- spinal cord compression
- metastatic brain tumors, most often from lung and breast Ca
- presents usually as mental deterioration, focal neurologic deficits or seizures
Pathologic changes in pulmonary system during cancer?
- Pulmonary edema/CHF
- Recurrent pleural effusions
- pneumonitis
- Lung Ca specifically
- squamous cell (25-40%)–> hypercalcemia
- adenocarcinoma (30-50%)–> hypercoagulable/osteoarthritis
- large cell (10%)–> gynecomastia
-
small cell (15-24%)–> inappropriate ADH secretion/ectopic corticotropin secretion
- eaton-lambert
- myasthenice syndrome
What is pulmonary osteoarthropathy?
Pulmonary osteoarthropathy- condition that affects some lung Ca pt-clubbing, spoon shaped nails, inflammation/swelling/pain in hands, fingers, knees ankles
What are some other various pathological changes that can occur system wide?
- Anorexia/weight loss- hyperalimentation
- electrolyte abnormalities
- hypercalcemia d/t bone mets
- Na and K changes with N/V/D
- Adrenal insufficiency- tumor or suppression of adrenals with corticosteroid rx
- ectopic hormone production (specific small cell LC)
What are some pathological changes from cancer in cardiac system?
- Malignant involvemnt of pericardium (pericardial effusion)
- electric alternans or paroxysmal a fib
- pericarial tamponade
- most common with lung Ca
- Drug induced CMP
- impariment of LVF for as long as 3 years after d/c of therapy
- SVC Obstruction
What is SVC obstruction? What causes it?
Metastatic spread to mediastinum
- venous engorgment above the waist, dyspnea and airway obstruction
- increased ICP from increase in CVP
- Compression of great vessels may lead ot syncope
- hoarseness/dyspnea may indicate tracheal compression
Concerns with mediatsinal masses?
S/S of concerning mediatsinal mass?
- Always perserve spontaneous respiration
- never induce general anesthesia
- sometimes the only thing keeping the airway open is the patient spontaneously breathing
- if need general anesthesia- need bypass on standby
S/S of concerning mediastinal mass
- JVD
- irritable
- nausea
- hoarseness
Pathological changes in renal system with cancer
- decreased clearance
- drug induced nephrotoxicity/nephrotic syndrome
- ureteral obstruciton>> hydronephrosis
- hyperuricemia
Pathologic hepatic system effects from cancer?
- Damage to hepatocytes
- coagulopathies
- DIC common with hepatic metastasis - poor prognosis
Metabolic complications with cancer?
- Catabolic state- cancer burns through energy
- diarrhea
- poor nutritional status- chekc albumin
- volume depleted state
- hypotension
What are paraneoplastic syndromes?
- Affects 8% of pt with cancer
- some come in as emergency. 80% occur before dx of ca
- Fever/cachexia
- neuro abnormalities: limbic encephalitis, cerebellar degeneration, lambert-eaton myasthenia syndrome and myasthenia gravis
- endocrine adnormalities: SIADH, Hyper calcemia, cushing syndrome, hypoglycemia
- Renal abnormallities: nephritis, amyloidosis
- derm abnorm.
- rheumatologic abnormalities
- hema abnormlalites
What is Lambert Eaton syndrome?
- antibodies develop to voltage-gated calcium channel receptors
- commonly associated with SCLC
- Can cause NMB sensitivity and major potentiation
- not frequently dx, usually will be recognized when administered anesthesia
How is cancer treated?
Multimodal therapy is most common
- Surgery
- traditional chemo: various MOA
- Targeted chemo: monoclonal antibodies
- radiation therapy: MOA is damage to DNA
- Ablation therapy
- RFA: primary liver tumors and metastases, localized lung, kidney, adrenal gland, and bone tumors
- Cancer vaccines and immunomodulators
MOA Alkylating agents?
Form reactive molecules that cause DNA cross-linking problems such as abnormal base pairing and strand breaks that interfere with primarily with DNA but also RNA, protein synthesis and replication
MOA antimetabolites?
Structural analogs of folic acid, purines, or pyrimidines that block enzymes necessary for nucleic acid and protein synthesis
MOA antitumor antibiotics?
form complexes with DNA/RNA that inhibit their subsequent synthesis
MOA Microtubule assembly inhibitors?
vinca alkaloids and taxanes, both of which act on the mitotic process by interfering wiht microtubulea ssembly or diassembly
Adverse effects of Ca treatment?
- bone marrow suppression
- cv toxicity
- pulmonary toxicity
- central and peripheral nervous system damage
- renal toxicity
- hepatic toxicity
- gi/endocrine changes
- other: mucositis, ototoxicity, renal insuff.
Chemo drugs associsted with CV toxicity?
Class: anthracyclines- most commonly associated
Ex: Doxorubicin (adriamycin) & daunorubicin
- dose-related CMP
- Can be acute/chornic
- acut CMP 10% (benign and symptoms usually resolve with d/c
- dysrhythmia, QT prolongation
- acut CMP 10% (benign and symptoms usually resolve with d/c
- Chronic toxicity- LV dysfunction and CMP can occur in an early onset form taht usually appears within 1 yr of treatment and a late-onset form that can emerge much later
- Enhances myocardial depression with anesthetics (acute LV failure during GA, 1 mo after cessation)
PEARLS- BASELINE and periodic ECHO recommended
What are some cardiac affects with fluorouracil?
Associated with pericarditis, angina, coronary artery vasospasm, ichemia-related EKG changes, and conduction defects
What are some side effects of monoclonal antibodies?
high level HTN
Bevacizumab, trastuzumab, sorafenib (all exampled monoclonal antibodies)
Cardiac s/e of radiation to chest?
- Myocardial fibrosis
- pericarditis
- valvular fibrosis
- conduciton abnormalities
- accelerated development of CAD
- Cumulative exposure is a factor
- ALSO can see these effects if patient had radiation has child but is perfectly healthy now
What are some anesthesia implications for bleomycin?
Bleomycin has dose-related toxicity
- causes endothelial damage (looks like PNA)–> type I and type II alveolar necrosis–> pulmonary fibrosis- no Rx
- pulmonary HTN
- Increased A-a gradient
- induced hyperoxic pulmonary injury- free radical formation
- Recommend
- baseline and serial PFT and CXR
- ABG Sao2
- adjust o2 for sat >90%
- colloid v crystalloid (don’t want to overhydrate with cyrstalloid)
- corticosteroids
What are other drugs that can cause pulmonary toxicity?
- Cyclophosphamide
- busulfan
- methotrexate
- lomustine
- carmustine
- mitomycin
- vinca alkaloids
Concerns with methotrexate?
- Fulminant non-cardiogenic pulmonary edema
- progressive inflammation with infiltrates and effusions
- toxicity 8%
What are some pulmonary effects with radiation to chest?
- interstitial pneumonities and pulmonary fibrosis
- tracheal stenosis
- airway exam can be completely normal
- smallest tube possible
- if you can’t pass, maybe need to wake up
- Symptoms typically begin within first 2-3 months of treatment and usually regresses within 12 months
“Pearls” for pulmonary toxicity
- Preop o2 sat, CXR, PFT, ABG
- Intraop exposure to high concentraiton o2 may exacerbate preexisting bleomycin induced lung injury and contribute to postop vent failure
- periop coritcosteroid admin may be of benefit in treating bleomycin-induced pneumonitis
What are some renal effects from cisplatin?
- decreased GFR within 3-5 days
- renal insufficiency and hypomagnesemia are typical presenting signs
- ATN–> ARF–> HD