AFib & Pathophysiology
A patient with AFib has an irregular ventricular rhythm. What is the primary electrical abnormality responsible for this rhythm?
Chaotic/disorganized electrical activity in the atria resulting in irregular conduction through the AV node.
A patient with AFib has a pulse of 142/min. What additional assessment finding would be most concerning?
A. Mild fatigue
B. BP 82/46 mmHg
C. Anxiety
D. Occasional palpitations
B. BP 82/46 mmHg
What is the primary purpose of giving a beta blocker to a patient with AFib?
To slow the ventricular rate through AV-node suppression/rate control.
What is the most serious long-term complication AFib can contribute to that anticoagulation is intended to help prevent?
Ischemic stroke.
A patient with AFib has HR 110/min, BP 126/74, SpOâ‚‚ 97%, and is alert. What is the nurse's priority?
Continue assessment and monitoring while implementing the prescribed treatment plan.
Why can a patient with AFib develop decreased cardiac output even when the ventricular rate is not extremely fast?
The atria are not contracting effectively, so the patient loses the normal contribution of atrial contraction to ventricular filling, which can reduce cardiac output.
The nurse assesses an AFib patient and finds HR 148/min, BP 86/50, RR 28, and new confusion. What should the nurse recognize?
The patient may be hemodynamically unstable with decreased tissue perfusion and requires immediate intervention/escalation.
A patient receiving an anticoagulant for AFib asks, "Is this medication going to fix my abnormal heart rhythm?" How should the nurse respond?
Anticoagulation is primarily used to reduce the risk of thromboembolism/stroke; it does not directly restore normal sinus rhythm.
Put these events in the correct order:
A. Embolus travels to the brain
B. Blood pools in the atria
C. Thrombus forms
D. Atrial contraction becomes ineffective
D → B → C → A
A patient with AFib has HR 160/min and reports dizziness. BP is 88/52. What should the nurse recognize?
The patient may be experiencing decreased cardiac output/hemodynamic instability.
A patient has persistent AFib and asks why they are at risk for a blood clot. What is the best explanation?
Ineffective atrial contraction can cause blood to pool in the atria, promoting thrombus formation that can potentially embolize.
A patient with AFib reports dizziness when standing. Which additional finding would be most important for the nurse to assess?
Blood pressure, particularly for hypotension/orthostatic changes, along with heart rate and rhythm and signs of decreased perfusion.
A patient taking an anticoagulant has new bruising and reports black, tarry stools. What is the nurse's priority concern?
Possible significant bleeding, particularly gastrointestinal bleeding.
A patient with AFib suddenly develops facial drooping and right-sided weakness. What should the nurse do?
Treat this as a possible acute stroke and activate the appropriate emergency/stroke response immediately.
A patient with AFib suddenly becomes short of breath with crackles throughout both lungs. What complication should the nurse suspect?
Acute heart failure/pulmonary edema related to compromised cardiac function.
Which patient is at greatest risk for decreased cardiac output related to new-onset AFib?
A. HR 82/min, BP 132/76, asymptomatic
B. HR 110/min, BP 128/74, mild fatigue
C. HR 156/min, BP 84/48, cool extremities
D. HR 96/min, BP 118/70, occasional palpitations
C. The tachycardia combined with hypotension and cool extremities indicates impaired perfusion.
Which assessment finding would be the highest priority to report?
A. HR 104/min and irregular
B. Fatigue after walking to the bathroom
C. New unilateral weakness and slurred speech
D. Patient reports occasional palpitations
C. These are possible signs of an acute stroke.
A patient with AFib is being considered for electrical cardioversion. Why is assessment of anticoagulation/stroke risk particularly important?
Restoring sinus rhythm can affect thromboembolic risk, and a clot that has formed in the atria could potentially embolize.
A patient taking apixaban asks which finding should be reported immediately. Which is the best answer?
A. Mild fatigue
B. Occasional palpitations
C. Black, tarry stool
D. Heart rate of 88/min
C. Black, tarry stool, which can indicate GI bleeding.
A patient with AFib is receiving treatment when the nurse notices new confusion and a BP of 76/40. What should the nurse do first?
Immediately assess and escalate the patient's unstable condition; the hypotension and altered mental status indicate impaired perfusion.
A patient with chronic AFib suddenly develops hypotension, dyspnea, and altered mental status. Explain why the ventricular rate and rhythm may be contributing to the patient's deterioration.
A rapid/irregular ventricular rate can reduce ventricular filling time and cardiac output, leading to decreased tissue perfusion and hemodynamic instability.
The nurse is caring for four patients with AFib. Which patient should the nurse assess first?
A. Patient with HR 108/min who reports mild fatigue
B. Patient with HR 96/min who is waiting for discharge teaching
C. Patient with HR 140/min and BP 78/42 who is confused
D. Patient with HR 102/min who needs assistance ordering lunch
C. Hypotension and altered mental status indicate possible hemodynamic instability.
A patient with AFib is prescribed an anticoagulant but says, "I stopped taking it because I haven't had any symptoms." What is the nurse's best response?
Explain that AFib can be asymptomatic while the risk of thromboembolism remains, and the patient should not stop anticoagulation without discussing it with the healthcare provider.
A patient says, "My heart rhythm feels normal today, so why do I still need my anticoagulant?" What is the most important concept for the nurse to explain?
The absence of symptoms does not necessarily eliminate the risk of thromboembolism. AFib can be intermittent or asymptomatic, and stroke-prevention decisions are based on the patient's overall risk, not simply how they feel that day.
A patient with AFib has HR 154/min, BP 78/44, chest pressure, dyspnea, and altered mental status.
The nurse has several possible actions:
3. Assess hemodynamic stability and immediately escalate care.