Hypertension with Left Ventricular Hypertrophy (LVH) and Associated Cardiac Changes: The patient's high blood pressure (170/90 mmHg), left bundle branch block (LBBB), and systolic murmur at the pulmonary valve can be associated with long-standing hypertension leading to LVH and subsequent cardiac remodeling. The LBBB can also contribute to the systolic murmur due to altered ventricular contraction dynamics.

Chronic Obstructive Pulmonary Disease (COPD): Bilateral basal crepitations suggest a pulmonary condition. Given the patient's age, COPD is a likely consideration, especially if the patient has a history of smoking or exposure to lung irritants.
Atherosclerotic Peripheral Artery Disease: Numbness in both lower limbs without significant power or sensation loss could indicate early stages of peripheral artery disease, which is common in elderly patients with hypertension and potential risk factors for atherosclerosis.
Diabetes Mellitus: Although not directly indicated, the presence of hypertension and potential for peripheral neuropathy (numbness in lower limbs) suggests that diabetes should be considered, especially if there are other risk factors or symptoms not mentioned.

Cardiac Amyloidosis: This condition can present with heart failure symptoms, arrhythmias (like sinus bradycardia), and murmurs. It's crucial to consider, especially in elderly patients with unexplained heart failure or conduction abnormalities.
Sleep Apnea: Given the patient's age, hypertension, and sinus bradycardia, sleep apnea is a condition that should not be missed, as it can have significant implications for cardiovascular health.
Subclavian Steal Syndrome: Although less common, this condition can cause numbness or weakness in the arms (though the patient presents with lower limb symptoms, it's a reminder to consider vascular steal syndromes in the differential for unexplained limb symptoms).

Fabry Disease: A genetic disorder that can lead to hypertension, cardiac abnormalities (including murmurs and conduction defects), and peripheral neuropathy. It's rare but should be considered in patients with a constellation of systemic symptoms.
Multifocal Atherosclerosis: While atherosclerosis is common, its multifocal presentation affecting different vascular beds simultaneously (e.g., coronary, peripheral, and cerebral) is less common and could explain a variety of the patient's symptoms if considered in the context of systemic atherosclerotic disease.