Table 1.1 Risk factors for painless acute MI [1]. Risk Factors % Without Chest Pain Prior heart failure 51 Prior stroke 47 Age Ͼ 75 years 45 Diabetes mellitus 38 Non-white 34 Women 39 1. QRS complex width Ͼ 0.12 s; 2. broad QS or rS pattern in the right precordial leads (leads V1, V2, and sometimes V3); KEY FACT | 7% of patients with acute MI or unstable angina had their pain partially or fully reproduced on chest wall palpation. KEY FACT | Sinus tachycardia was found in only 8-69% of patients (with PE). KEY FACT | The presence of pleurisy is neither sensitive nor specific for PE. In one study … pleuritic chest pain occurred in only 44% of patients with PE versus 30% of patients without PE.