This 60-year-old man presented with sudden onset of dyspnea at rest for 1 day along with orthopnea and chest tightness. On examination, he had rhonchi and crepitations in both lungs with low oxygen saturation. Relevant tests showed hyperinflated lungs on CXR, LBBB on ECG, and hypoxemia and hypercapnia on ABG. The final diagnosis was acute left ventricular failure exacerbating chronic obstructive pulmonary disease.