A 73-year-old man with history of hypertension and osteoarthritis is evaluated for gradually increasing dyspnea over the preceding 6 weeks. He takes metoprolol for hypertension and naproxen for the arthritis. He has occasionally awakened in the night with mild dyspnea relieved by sitting up but has not noticed edema. Physical examination shows BP of 148/94, HR 96, and RR 16. O2 saturation is 92%. Neck veins show the jugular column 7 cm above the sternal angle. Lung examination reveals mild basilar crackles but no wheezing. Cardiac examination shows sustained apex impulse, S4 gallop, and no murmur. There is no peripheral edema. ECG shows stable left ventricular hypertrophy; no Q waves are seen. Chest x-ray shows increased interstitial markings and some cephalization of flow to the upper lobe vessels. The cardiac silhouette is boot-shaped, but there is no definite cardiomegaly. Echocardiogram shows left ventricular hypertrophy and LV ejection fraction of 55% (normal 50%-70%). What is the likely pathogenesis of this patient’s dyspnea?
A 73-year-old man with history of hypertension and osteoarthritis is evaluated for gradually increasing dyspnea over the preceding 6 weeks. He takes metoprolol for hypertension and naproxen for the arthritis. He has occasionally awakened in the night with mild dyspnea relieved by sitting up but has not noticed edema. Physical examination shows BP of 148/94, HR 96, and RR 16. O2 saturation is 92%. Neck veins show the jugular column 7 cm above the sternal angle. Lung examination reveals mild basilar crackles but no wheezing. Cardiac examination shows sustained apex impulse, S4 gallop, and no murmur. There is no peripheral edema. ECG shows stable left ventricular hypertrophy; no Q waves are seen. Chest x-ray shows increased interstitial markings and some cephalization of flow to the upper lobe vessels. The cardiac silhouette is boot-shaped, but there is no definite cardiomegaly. Echocardiogram shows left ventricular hypertrophy and LV ejection fraction of 55% (normal 50%-70%). What is the likely pathogenesis of this patient’s dyspnea?
💡 Explanation
## **Core Concept**
The patient's presentation suggests heart failure with preserved ejection fraction (HFpEF), characterized by symptoms of heart failure (dyspnea, orthopnea) in the setting of a normal or near-normal left ventricular ejection fraction (LVEF). HFpEF is often associated with diastolic dysfunction, where the heart's ability to relax and fill during diastole is impaired.
## **Why the Correct Answer is Right**
The patient's symptoms of gradually increasing dyspnea, orthopnea (mild dyspnea relieved by sitting up), and physical examination findings such as jugular venous distension (JVD), S4 gallop, and basilar crackles on lung examination are indicative of heart failure. The echocardiogram showing an LVEF of 55% supports the diagnosis of HFpEF. The pathogenesis of HFpEF involves diastolic dysfunction, likely due to left ventricular hypertrophy (LVH) seen in this patient, which is a consequence of long-standing hypertension. LVH leads to reduced compliance of the left ventricle, making it stiffer and less able to relax and fill properly during diastole.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might suggest systolic heart failure (which is incorrect given the normal LVEF), pulmonary embolism, or chronic obstructive pulmonary disease (COPD), none of which are directly supported by the provided clinical scenario and diagnostic findings.
- **Option B:** Similarly, without the content of Option B, it's assumed that any incorrect option would not align with the evidence supporting HFpEF and diastolic dysfunction.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl in this scenario is recognizing that patients with HFpEF often present with symptoms similar to those with heart failure with reduced ejection fraction (HFrEF) but have a preserved LVEF. The presence of LVH, hypertension, and the described echocardiogram findings supports the diagnosis of HFpEF. It's crucial to consider HFpEF in patients with heart failure symptoms and a normal LVEF, particularly in the context of risk factors such as hypertension and LVH.
## **Correct Answer Line**
**Correct Answer: .**
✓ Correct Answer: C. Impaired diastolic relaxation and filling
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