COPD vs. CHF Exacerbation

Author: V. Dimov, M.D.
Reviewer: S. Randhawa, M.D.

An 84 yo CF with PMH of COPD, RA, CHF, HTN, CAD S/P CABG, Afib on Coumadin was admitted to the hospital 1 week ago with a COPD exacerbation which improved, and she was transferred to a transitional care facility for rehabilitation.

The resident on call is paged because the patient is severely SOB and tachypneic this afternoon.

What is the first step?
See and examine the patient right away.

Physical examination:
A thin lady who is visibly SOB, using accessory muscles.
Tachypneic at 34/min.
Tachycardic at 100 bpm, regular.
SpO2 85% on her baseline home O2 of 2L/min.
Chest: (B) decreased air entry and crackles.
Legs: no edema

What do you think is going on?
COPD exacerbation or CHF?

What would you do?
Give Lasix 20 or 40 mg IV x 1
Order EKG, cardiac enzymes x 2 q 8 hrs, first set now, BNPep, CXR and ABG.
Give some extra breathing treatments and transfer the patient to telemetry.
Also give ASA - this would provide the largest decrease in mortality if she has an AMI.

What happened?

Labs (click to enlarge)

ABG showed respiratory and metabolic alkalosis, and hypoxemia.
Is it PE?
Her INR is 2.09.
Cardiac enzymes x 1 negative

CXR showed bilateral pulmonary edema, more on the right side.

It looks like CHF but why is it more on the right side?
It depends on the position of the patient. If she lies more on her right side, the congestion may be more predominant on the dependent side.

Is it pneumonia?
Less likely.
WBC elevation may be due to the steroids given for COPD exacerbation.

BNP is higher 1300.

The patient is breathing much more easily after the Lasix, she diuresed 500 cc, and says that she feels at baseline.

Final diagnosis:
CHF exacerbation

Reason: noncompliance with diet, she was drinking a lot of fluids in the less controlled environment of the rehabilitation unit. Cardiac ischemia was ruled out.

What happened?
The patient's condition steadily improved and she was discharged home with follow-up with her PCP.

What did we learn from this case?
Always think about the common causes of SOB - CHF, COPD, AMI, PE. Take SOB complaint seriously and initiate the work-up and the presumptive treatment immediately.

Stay at bedside and reevaluate the result of the given treatment. This will help to avoid the dreaded "Code blue" announcement on the overhead system.

What are the most common causes of CHF admissions?
At least one identifiable precipitating factor was found in 61.3% in a study of 48,000 patients. In order of frequency, they were:

Pneumonia or respiratory processes at 15.3%.
Ischemia or acute coronary syndromes at 14.7%.
Arrhythmia at 13.5%.
Uncontrolled hypertension at 10.7%.
Nonadherence to medications at 8.9%.
Worsening renal function at 6.8%.
Nonadherence to diet at 5.2%.

Related reading:
Dyspneic. DB’s Medical Rants.
Chronic Obstructive Pulmonary Disease (COPD).
Desperate to Cry, Desperate Not To. NYTimes.
I'm So Busy. The Happy Hospitalist, 05/2008.

Published: 03/21/2004
Updated: 05/03/2008

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