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Zorluk: OrtaCardiovascular System

A 69-year-old man is evaluated in the observation unit due to two days of worsening breathlessness, orthopnea, and a persistent cough producing pink-tinged sputum. His medical history includes long-standing essential hypertension, a myocardial infarction five years ago, and a 45 pack-year smoking history. Current medications include aspirin, lisinopril, and atorvastatin.

Vital signs are temperature 37.1°C (98.8°F), blood pressure 162/94 mm Hg, pulse 108/min, and respirations 24/min. Pulse oximetry displays 88% on room air.

Physical examination reveals a patient in moderate respiratory distress using accessory muscles of respiration. Auscultation of the lungs demonstrates a prolonged expiratory phase with high-pitched wheezes in all lung fields, accompanied by fine bibasilar crackles. Cardiac auscultation identifies a laterally displaced point of maximal impulse and a low-frequency diastolic sound immediately following S2. There is 2+ pitting edema extending to the mid-calves bilaterally.

An arterial blood gas analysis on room air shows:
pH: 7.50
PaCO2: 28 mm Hg
PaO2: 58 mm Hg
HCO3-: 21 mEq/L

Which of the following interventions is the most appropriate initial treatment for this patient's underlying condition?

  1. Intravenous administration of a loop diureticCevap
  2. B
    Systemic administration of glucocorticoids
  3. C
    Empiric therapy with a broad-spectrum fluoroquinolone
  4. D
    Inhaled administration of a short-acting anticholinergic agent
  5. E
    Continuous infusion of isotonic sodium bicarbonate

Cevap

The most appropriate initial treatment is the intravenous administration of a loop diuretic to reduce preload and relieve pulmonary edema caused by acute decompensated heart failure.
The correct intervention is the intravenous administration of a loop diuretic. This patient's presentation of orthopnea, pink-tinged frothy sputum, bibasilar crackles, a laterally displaced point of maximal impulse (indicating cardiomegaly), and an S3 gallop (indicating rapid ventricular filling into a non-compliant or volume-overloaded ventricle) is highly specific for acute decompensated heart failure (ADHF) with pulmonary edema. Initial management of ADHF primarily involves reducing cardiac preload and optimizing volume status, which is rapidly achieved with intravenous loop diuretics (e.g., furosemide, bumetanide, torsemide).

Adım Adım Çözüm

1
Analyze the patient's history and physical examination findings.
The patient has orthopnea, pink-tinged sputum, an S3 gallop (low-frequency diastolic sound after S2), laterally displaced PMI, bibasilar crackles, and peripheral edema.
These findings are classic for left ventricular dysfunction leading to acute pulmonary edema and subsequent right-sided volume overload.
2
Differentiate the cause of wheezing and dyspnea using the arterial blood gas and cardiac exam.
Despite the smoking history and wheezing, the S3 gallop and respiratory alkalosis (pH 7.50, low PaCO2) point to acute decompensated heart failure ('cardiac asthma') rather than a COPD exacerbation, which would typically present with a respiratory acidosis.
Hypoxia from pulmonary edema triggers hyperventilation, lowering PaCO2 and increasing pH in the early stages of ADHF.
3
Select the appropriate initial pharmacologic intervention.
Intravenous loop diuretics are chosen as the first-line therapy.
Loop diuretics rapidly decrease fluid volume and cause venodilation, significantly reducing cardiac preload and resolving the hydrostatic pulmonary edema.

Anahtar Kavram

Acute decompensated heart failure often presents with wheezing ('cardiac asthma') that must be distinguished from COPD exacerbations using cardiac exam findings (S3 gallop, displaced PMI) and blood gas analysis (respiratory alkalosis vs acidosis) to ensure appropriate treatment with diuretics rather than bronchodilators/steroids.
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Cardiovascular System

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