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Test your basic knowledge |
NCLEX Cardiac
Start Test
Study First
Subjects
:
nclex
,
health-sciences
,
nursing
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What are signs and symptoms of an MI?
An inflammation of the pericardium. It may result in MI.
Feeling of fullness in head - tightness around shirt collar - or rings/jewelry that suddenly seem tight - swelling in face - hands - arms - and swollen/cyanotic lips - dyspnea - coughing - hoarseness - chest pain - hemotysis - visable collateral ches
Awake and alert: IV lidocaine bolus and drip Unconscious - hypotensive - or S&S of angina/CHF: Direct current cardioversion and IV Lidocaine bolus and drip.
Crushing chest pain that lasts 30 mins or longer and may radiate to the neck - shoulders - or jaw - diaphoresis - nausea - and SOB.
2. What are the S&S associated with right sided heart failure?
Hematuria (tea or coca cola colored) - nosebleeds - gingival bleeding (no medicated mouth wash - flossing - or lemon glycerin swabs) - and bruising (assess for abuse w/o caregiver).
Cardiac tamponade (fluid in pericardial space) and thickening/scarring of the pericardial sac (constrictive pericarditis and possible RHF).
A central line placed that measures the right atrial pressure. Normal= 4-10 cm of H20.
Fatigue - JVD - Increased peripheral venous pressure - ascites - anorexia/complaints of GI distress - cyanosis - and dependent edema.
3. What are general guidelines to be followed by a patient who has an implanted cardioverter defibrillator (ICD)?
GI - neuro - and cardiac. S&S= yellow/green vision - N&V - bradycardia - and anorexia.
(1st) Assess LOC - (2nd) if unconscious= begin CPR - and (3rd) Notify physician.
No magnets (cell phone 6 inches away from) - DO Not DRINK CAFFEINATED BEVERAGES - DO Not ENGAGE In ROUGH ACTIVITIES (FOOTBAll OR WRESTLING) - and no tight clothing over site.
You need to maintain use of those devices continually except when the patient is ambulating - bathing - or during physical therapy or skin assessment.
4. What should a patient do if they feel chest pain or discomfort?
Stop What they are doing - sit down and rest - if prescribed nitroglycerin tablets place one under tongue - if it still remains take another tablet in 5 mins - and if still in pain take another after an additional 5 mins - if still pain after 3 table
Pallor - diaphoresis - tachypnea - severe tearing chest pain radiating to back - PULSES In ARMS Are STRONG BUT LEG PULSES Are WEAK - low SP02.
Chest pain or discomfort that occurs when your heart doesn't get enough blood and oxygen. Stable: the feeling comes and goes at expected times. Unstable: the pattern of your pain has changed (longer - hurts more - etc.)
If feel more than 3 shocks in a row or develop signs of infection at the site.
5. In What time period is the greatest risk of sudden death from an MI?
Second left intercostal space
One large emboli (smaller=better)
In fatty areas or over major muscles - large breasts - or bony prominences.
In the first 72 hours!!!!!
6. What is the treatment for a pt. with ventricular tachycardia?
Lung disease
Trendelenburg position for insertion. Pt holds breath to prevent air from entering sinus tract.
In the first 72 hours!!!!!
Awake and alert: IV lidocaine bolus and drip Unconscious - hypotensive - or S&S of angina/CHF: Direct current cardioversion and IV Lidocaine bolus and drip.
7. What is a assessment finding with DVT?
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8. What should you watch for with PICC lines that have been in place for 6 months?
Air answers (open junctions)
Clip hair if necessary - abrade the skin (use abrader pads or fine sandpaper and lightly rub skin using 2 or 3 brisk strokes - improves tracings) - dry skin if necessary - and attach the lead wires to the electrodes before you apply them to the patie
Steroid treatment or a pregnant woman who is retaining water.
Decreased tissue perfusion. Tx: clot busting treatment must start within 6 hours.
9. What drugs are most commonly used for angina?
Nitrates - Beta blockers - and Calcium channel blockers
D/C the med and call the doctor.
(1st) Assess the client for signs of decreased cardiac output and Notify the physician (2nd).
(1st) Assess the client for S&S of decreased cardiac output and Notify physician (2nd).
10. What will the Transthoracic echocardiograph (TTE) show that will indicate cardiac tamponade?
Correct her and tell her that the (+) lead goes on the left and the (-) lead goes on the right side.
Varicose veins - elevate legs - weight reduction - brawny in color - ted hose - topical steroids - ulcers - and skin color changes.
An enlarged space indicates fluid accumulation in the pericardial sac.
(1st) Assess the client for S&S of decreased cardiac output and Notify physician (2nd).
11. If 2 liters of fluid is left in the pericardial sac (cardiac tamponade) and goes untreated what could it cause?
A life threatening emergency that involves a tear in the aorta's intimal layer allowing blood to flow through a false lumen creating a hematoma or false aneurysm.
Identify the highest point of pulsation and measure from this point to the sternal angle. A measurement of greater than 3 cm= an elevated venous pressure.
Right sided heart failure
BP is elevated or decreased depending on activity.
12. What disease can cause right sided heart failure?
Verapamil (calan) - diltiazem (cardizem) - nifedipine (procardia) - amlodipine (norvasc).
Lung disease
NO because it isn't sterile so keep out.
Don't interfere!
13. What does vasotec (Enalapril Maleate) do/SE?
Lowers BP and makes heart beat stronger. SE: flushed face.
Give furosemide (lasix) 40-60 mg IV - O2 administration - morphine sulfate 3-5 mg IV - have patient sit up with feet lowered (decreases venous return to the heart) - nitroglycerin given sublingual or IV - and rotating tourniquets (can reduce intratho
A nosebleed
An inflammation of the pericardium. It may result in MI.
14. What is the antidote for coumadin?
Diuretic & Digoxin (dig increases force of contraction and increases perfusion). Know working if client is peeing (kidney perfusion) and more alert!
Vitamin K (aqua myphiton)
Chronic arteriosclerotic disease.
Don a protective gown - gloves - and goggles - call Dr - hand pt. emesis basin and raise the HOB 45* (at this angle he can spit out blood and prevent N&V/aspiration - have another nurse firmly press on his nose just below bony part (apply pressure at
15. What should you tell a patient who developed a hematoma in the hospital and is being discharged?
To report to her healthcare provider if she feels a large bump in her groin - if she has groin pain unrelieved by acetaminophen - or if she develops numbness - tingling - etc. in the affected leg.
(1st) Assess LOC - (2nd) if unconscious= begin CPR - and (3rd) Notify physician.
(1ST) BEGIN CARDIOPULMONARY RESUSCITATION (The PT. Is DYING) And NotIFY PHYSICIAN (2ND).
The internal jugular veins (external are less reliable).
16. What should be taught upon discharge for someone going home on coumadin as a result of a PE?
It is a noninvasive test that takes 15 mins. Electrodes are applied to sites on your body. You must lie still - relax - and breathe normally and remain quiet. Talking or moving distorts the images
Poorly controlled hypertension
Need for follow up blood tests - Need to take oral warfarin for at least 3 months - and to reduce current risk encourage weight loss - smoking cessation - and regular exercise.
Awake and alert: IV lidocaine bolus and drip Unconscious - hypotensive - or S&S of angina/CHF: Direct current cardioversion and IV Lidocaine bolus and drip.
17. What should be checked in a patient on a beta blocker?
In the first 72 hours!!!!!
Pulse before and after giving.
Patient who are unable to tolerate exercise stress testing.
Limit the size of the infarction is the goal. Treatment= thrombolytic therapy (tPA) initiated within 6 hours of the first symptoms= standard treatment.
18. What will be the treatment for an acute episode of life threatening tamponade?
A clinician will perform echocardiogram guided pericardiocentesis with a needle or catheter to remove excess fluid in the pericardial sac.
(1ST) BEGIN CARDIOPULMONARY RESUSCITATION (The PT. Is DYING) And NotIFY PHYSICIAN (2ND).
It will take 5 mins and he/she should remain quiet for about 1 minute without talking or moving.
A monitor with four dual electrodes that are applied to the patients neck and thorax.
19. What are the nursing interventions for a patient with premature ventricular contractions?
Administer 100% O2 - left trendelenburg position - heparin administered - and oral warfarin started (give heparin and warfarin together for at least 5 days).
A NON INVASIVE doppler exam of the heart via the thorax to detect cardiac tamponade.
(1st) Assess the client for signs of decreased cardiac output and Notify the physician (2nd).
Limit the size of the infarction is the goal. Treatment= thrombolytic therapy (tPA) initiated within 6 hours of the first symptoms= standard treatment.
20. Where is the apex/mitral valve landmark on the chest?
Fourth or fifth intercostal space at or medial to the midclavicular line.
Check for response - activate ERS - open airway head tilt chin lift - check breathing (5-10 sec) - give 2 breaths (1 sec) with visible chest rise - checks brachial pulse (5-10 sec) - locates CPR finger position - deliver 1st cycle of compressions (30
A fluid accumulation in the pericardial space that compromises cardiac function. It is considered a medical emergency and is a hemodynamic consequence of blood or excess fluid accumulation in the pericardial sac. Common causes are surgical or traumat
One at a time to assess the pulse amplitude and contour.
21. What is the treatment for myocardial infarction?
This noninvasive test takes 24 hours and causes no discomfort. Electrodes are applied to your body - you need to log your activities for a 24 hour period (walking - sleeping - urinating - physical symptoms - and medications). Don't tamper with the mo
(1st) Assess LOC - (2nd) if unconscious= begin CPR - and (3rd) Notify physician.
Don't interfere!
MONA=Magnesium sulfate - O2 - Nitroglycerin - Aspirin (mona has a heart so EKG also if select all that apply).
22. What causes secondary hypertension?
Stop What they are doing - sit down and rest - if prescribed nitroglycerin tablets place one under tongue - if it still remains take another tablet in 5 mins - and if still in pain take another after an additional 5 mins - if still pain after 3 table
Premature beats that are not preceded by a P- wave - QRS is wide and bizarre - and the T wave of the premature beat is generally large and in the opposite direction of the QRS.
Arterial pulse: 60-90 - Amplitude: 4+=strong and bounding - Edema: 0=none - Reflex 2+
Steroid treatment or a pregnant woman who is retaining water.
23. What are the treatments/ S&S of peripheral venous disease?
Correct her and tell her that the (+) lead goes on the left and the (-) lead goes on the right side.
Put on gloves - remove the previous application paper and use a tissue to remove all ointment from the site to prevent overdose - squeeze the prescribed ointment in a thin layer onto a clean ruled application paper - choose an unused site on the ches
You need to maintain use of those devices continually except when the patient is ambulating - bathing - or during physical therapy or skin assessment.
Varicose veins - elevate legs - weight reduction - brawny in color - ted hose - topical steroids - ulcers - and skin color changes.
24. What should you teach your patient about an abdominal ultrasonography?
Used to detect an abdominal aortic aneurysm. This noninvasive test takes 15 to 30 mins. They apply conductive gel to your abdomen and move a transducer over abdomen to scan blood vessels. Sound waves bouncing off anatomic structures are translated in
Check for response - activate ERS - open airway head tilt chin lift - check breathing (5-10 sec) - give 2 breaths (1 sec) with visible chest rise - checks brachial pulse (5-10 sec) - locates CPR finger position - deliver 1st cycle of compressions (30
It is calculated by checking the brachial BP and the ankle BP. The ankle systolic pressure is divided by the brachial systolic. The NA can perform. 0.97-1 is normal anything below indicates ischemia.
Low pitched sounds such as S3 and S4 and the murmur of mitral stenosis. BEL(low)L
25. What should the plan of care include for a diagnosis of activity intolerance r/t right sided HF?
A disease in which thrombi trap blood in the deep veins of the pelvis and legs.
Include rest periods prior to any activity.
Clip hair if necessary - abrade the skin (use abrader pads or fine sandpaper and lightly rub skin using 2 or 3 brisk strokes - improves tracings) - dry skin if necessary - and attach the lead wires to the electrodes before you apply them to the patie
Constipation or MAY CAUSE ANKLES TO SWELL (call healthcare provider).
26. What is the goal of treatment for an MI? Treatment?
You need to maintain use of those devices continually except when the patient is ambulating - bathing - or during physical therapy or skin assessment.
Limit the size of the infarction is the goal. Treatment= thrombolytic therapy (tPA) initiated within 6 hours of the first symptoms= standard treatment.
Varicose veins - elevate legs - weight reduction - brawny in color - ted hose - topical steroids - ulcers - and skin color changes.
High pitched sounds like S1 and S2 (pericardial friction rubs - aortic/mitral regurgitation murmurs). DIAPH(high)ragm
27. What should you observe for in someone on bleeding precautions?
When a large air bubble blocks blood flow from the right ventricle into the pulmonary artery.
A drop in systolic BP greater than 12 mm Hg during inspiration indicating a compromise.
It is a sterile procedure so both nurse and patient should wear a mask - arrange sterile field - remove dressing - assess the catheter insertion site for infection - put on sterile gloves - clean the site moving outwardly in a circular motion - apply
Hematuria (tea or coca cola colored) - nosebleeds - gingival bleeding (no medicated mouth wash - flossing - or lemon glycerin swabs) - and bruising (assess for abuse w/o caregiver).
28. What should be immediately done for a patient experiencing digoxin toxicity?
Protamine Sulfate
Stop the medication - address the factors that may have precipitated the event. If life threatening Digibind ay be indicated.
Lower left sternal border
It usually occurs when your heart is working harder (ex: exercising - eating large meal - or feeling stress. Also very hot or cold weather).
29. What activity should a patient with pericarditis - who is undergoing treatment - be allowed?
It is noninvasive. You must not eat - smoke - or drink alcohol for 3 hours before the test. WEAR COMFORTABLE SHOES And LOOSE LIGHTWEIGHT SHORTS OR SLACKS - YOU MAY GET AN INJECTION of THAllIUM - after your blood pressure and ECG are monitored for 10-
When they occur >6 per minute or occurring 2 or more in a row (bigeminy or trigeminy=on way out).
Maintain BED REST
Fatigue - JVD - Increased peripheral venous pressure - ascites - anorexia/complaints of GI distress - cyanosis - and dependent edema.
30. What things should you do to assess cardiovascular status?
Rapid ventricular rate with no relationship to atrial activity and QRS complex is wide and bizarre.
Give furosemide (lasix) 40-60 mg IV - O2 administration - morphine sulfate 3-5 mg IV - have patient sit up with feet lowered (decreases venous return to the heart) - nitroglycerin given sublingual or IV - and rotating tourniquets (can reduce intratho
Inspect pulses on chest - inspect the internal jugular veins - palpate the apical pulse - palpate the carotid arteries - and auscultate the heart sounds.
Cannot
31. What should you do to treat pulmonary edema?
Direct current cardioversion and digoxin/propranolol (inderal).
Thromboanglitis obliterans/ Buerger's disease= inflammatory process of arterial wall - veins - and nerves where they become blocked. It is associated with smoking/tobacco use.
Give furosemide (lasix) 40-60 mg IV - O2 administration - morphine sulfate 3-5 mg IV - have patient sit up with feet lowered (decreases venous return to the heart) - nitroglycerin given sublingual or IV - and rotating tourniquets (can reduce intratho
Limit the size of the infarction is the goal. Treatment= thrombolytic therapy (tPA) initiated within 6 hours of the first symptoms= standard treatment.
32. Which jugular veins give a more accurate estimate of the jugular vein pressure and pressure in the right atrium?
Pulmonary edema
The internal jugular veins (external are less reliable).
Lower HOB - place patient supine - assess LOC - open airway - assess breathing - get ambu bag - put on gloves - connect tubing from O2 source - adjust flow to 10 to 15 liters. First RESCUER: PLACE APEX of MASK OVER BRIDGE of NOSE And BASE BETWEEN LOW
BIRTH CONTROL PILL (LEADING CAUSE of HTN In YOUNG WOMEN-45=STILL YOUNG) - BLACK Male (then white male - than black female - then white female) - obesity - smoking - stress - high Na diet - lack of exercise - age - sex - race - or noncompliance.
33. When should a patient call 911 after having an implantable cardioverter defibrillator (ICD) placed?
No radial artery punctures if negative
IV LIDOCAINE BOLUS (50-100 mg) followed by an IV lidocaine drip (suppresses ventricular activity).
Paroxysmal nocturnal dyspnea - elevated pulmonary capillary wedge pressure - BLOOD TINGED SPUTUM - cough - orthopnea - exertional dyspnea - cyanosis.
If you feel lightheaded - dizzy - or heart palpitations but feel no shock from the ICD.
34. What should you do when applying a femoral artery compression device?
A clinician will perform echocardiogram guided pericardiocentesis with a needle or catheter to remove excess fluid in the pericardial sac.
Demand: Works PRN (when HR goes below predetermined rate) or Fixed: beats constantly at predetermined rate so no matter what heart does still beats at same rate.
Assess and mark the location of the dorsalis pedis and posterior tibial pulses in affected leg - wash hands and put on sterile gloves - gown - and mask - position device - check circulation and make sure good pedal pulse is present - IMMEDIATELY REPO
Paroxysmal nocturnal dyspnea - elevated pulmonary capillary wedge pressure - BLOOD TINGED SPUTUM - cough - orthopnea - exertional dyspnea - cyanosis.
35. What is a chemical stress test (persantine stress test)?
A life threatening emergency that involves a tear in the aorta's intimal layer allowing blood to flow through a false lumen creating a hematoma or false aneurysm.
A central line placed that measures the right atrial pressure. Normal= 4-10 cm of H20.
It is a test that examines the hearts response to being stressed by a pharmacologic agent. Persantine and adenosine vasodilate the coronary arteries and cause blood to shunt away from partially occluded coronary vessels. Then dobutamine stresses the
Used to detect an abdominal aortic aneurysm. This noninvasive test takes 15 to 30 mins. They apply conductive gel to your abdomen and move a transducer over abdomen to scan blood vessels. Sound waves bouncing off anatomic structures are translated in
36. What is the purpose of compression devices?
(1st) Assess the client for S&S of decreased cardiac output and Notify physician (2nd).
Varicose veins - elevate legs - weight reduction - brawny in color - ted hose - topical steroids - ulcers - and skin color changes.
Include rest periods prior to any activity.
To reduce a patients risk of DVT and PE. They include graduated compression stockings - vena cava filters - and intermittent sequential external compression devices.
37. Where is the aortic valve landmark on the chest?
Maintain BED REST
Second right intercostal space
A complication from a venous access device or port. It is a blockage of the superior vena cava preventing superior blood flow from reaching the heart.
Steroid treatment or a pregnant woman who is retaining water.
38. What is the treatments for hypertension?
Ask patient to make a tight fist - using your index and middle fingers compress both the radial and ulnar arteries to obstruct blood flow to hand - ask pt to relax hand (hand and palm should appear blanched bc flow stopped) - release pressure on ulna
Decrease in weight - diuretics (watch K loss) - aldactone (k sparing but check renal fx) - inderal (do Not give to asthma patients or diabetic patients) - more exercise - no smoking - and decreased Na intake.
Identify the highest point of pulsation and measure from this point to the sternal angle. A measurement of greater than 3 cm= an elevated venous pressure.
International Normalized Ratio measures blood clotting time and compares it to normal values. 1.0=normal. Most people on anticoagulants are 2-3.
39. What should you teach your patient about a cardiac catheterization?
Varicose veins - elevate legs - weight reduction - brawny in color - ted hose - topical steroids - ulcers - and skin color changes.
The physician injects a local anesthetic into the site - inserts a catheter - and threads it through the artery into the left side of the heart or through a vein into the right side of the heart to your lungs. Next - a dye is injected which may cause
Ventricular rate is regular at a rate of 40-60 bpm and there is no relationship of P waves to QRS complexes.
Elevated legs - anticoagulation therapy (aggressive: generally IV heparin) - Be alert for signs of PE.
40. What is characteristic of premature ventricular contractions?
Paroxysmal nocturnal dyspnea - elevated pulmonary capillary wedge pressure - BLOOD TINGED SPUTUM - cough - orthopnea - exertional dyspnea - cyanosis.
CPR should be done. No defibrillation bc no rhythm to shock (heart already depolarized).
One large emboli (smaller=better)
Premature beats that are not preceded by a P- wave - QRS is wide and bizarre - and the T wave of the premature beat is generally large and in the opposite direction of the QRS.
41. What should you teach a patient regarding discharge after a DVT?
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42. What is the maintenance for venous access port that isn't being regularly used?
File toe nails - if have new shoes only wear 2 hrs/day d/t neuropathy can't feel if problem. To decrease pain of claudication massage legs to increase circulation.
Used in an emergency (Vfib/defib) - used with Vfib or Vtach - NO CARDIAC OUTPUT - client is unconscious - EKG monitor - NO CONSENT NEEDED - begin with 200 Joules and up to 360.
GI - neuro - and cardiac. S&S= yellow/green vision - N&V - bradycardia - and anorexia.
Must be flushed 1x/month with heparin and between treatments.
43. What SE should you look for with calcium channel blocker use?
When a large air bubble blocks blood flow from the right ventricle into the pulmonary artery.
BIRTH CONTROL PILL (LEADING CAUSE of HTN In YOUNG WOMEN-45=STILL YOUNG) - BLACK Male (then white male - than black female - then white female) - obesity - smoking - stress - high Na diet - lack of exercise - age - sex - race - or noncompliance.
Constipation or MAY CAUSE ANKLES TO SWELL (call healthcare provider).
It is a sterile procedure so both nurse and patient should wear a mask - arrange sterile field - remove dressing - assess the catheter insertion site for infection - put on sterile gloves - clean the site moving outwardly in a circular motion - apply
44. What should you do immediately if you suspect someone of developing a hematoma?
Exercise and use graduated compression devices as directed - don't stand for long period of time - to avoid dislodging blood clots don't rub or massage your legs.
Having the patient supine is ideal but any position is acceptable so long as in same position for each monitoring session - locate clean and dry sensor sites on the neck (in line with earlobe) and thorax (midaxillary at xiphoid process) - connect lea
Using both gloved hands - apply firm pressure just above the skin puncture site and over the hematoma to compress the area. Wait at least 15 mins before removing pressure and reassessing the site. Then notify the health care provider.
Premature beats that are not preceded by a P- wave - QRS is wide and bizarre - and the T wave of the premature beat is generally large and in the opposite direction of the QRS.
45. What type of surgery is done for an aortic dissection?
Left sternal border
The damaged portion of the aorta is removed and is repaired with a synthetic graft.
Diuretic & Digoxin (dig increases force of contraction and increases perfusion). Know working if client is peeing (kidney perfusion) and more alert!
D/C the med and call the doctor.
46. Where is the pulmonic valve landmark on the chest?
Second left intercostal space
D/C the med and call the doctor.
NO TED HOSE - NO SHEETS/BLANKETS - NO COMPRESSION DEVICES - (TEACH NO OPEN TOES SHOES). Lambs wool is okay!
A disease in which thrombi trap blood in the deep veins of the pelvis and legs.
47. What is pericarditis?
Include rest periods prior to any activity.
An inflammation of the pericardium. It may result in MI.
Before
ST segment elevation (STEMI)
48. What should you do frequently for someone with a central line to help prevent pulmonary emboli?
Deep in the sternomastoid muscle - so look for pulsations in the soft tissue surrounding that area.
Feeling warm (fire) or tin can taste is expected and will pass.
Awake and alert: IV lidocaine bolus and drip Unconscious - hypotensive - or S&S of angina/CHF: Direct current cardioversion and IV Lidocaine bolus and drip.
Check all junctions frequently to make sure secure - especially before patient gets out of bed - and always use tubing with twist lock connections.
49. What condition can cause left sided heart failure?
Pericardial friction rub: A high pitched squeaking or grating sound during cardiac contraction. It is typically best heard when the patient sits - leans forward - and breaths out.
A central line placed that measures the right atrial pressure. Normal= 4-10 cm of H20.
It usually occurs when your heart is working harder (ex: exercising - eating large meal - or feeling stress. Also very hot or cold weather).
Vascular - artery disease causing fluid to back up into the lungs.
50. What should be done immediately if a pulmonary embolism is suspected?
Have the patient use the val salva maneuver when the line is being removed (bear down/hold breath) to prevent air from entering where the line was and causing a PE.
Clip the hair to allow good contact between the electrodes and the skin (DONT SHAVE).
Vascular - artery disease causing fluid to back up into the lungs.
Close the open catheter lumen with the clamp - and place the pt on their left side in trendelenburg to move the air embolus away from the pulmonic valve. If you hear a churning sound in his chest (a classic sign of air embolus) and the patient starts