Final answer:
Patients with syncope and increased PR and QRS duration may have an underlying cardiac conduction issue that could lead to various forms of tachycardia or heart blocks. The interpretation of an ECG, which can reveal these abnormalities, is complex and necessary for accurate diagnosis.
Step-by-step explanation:
When a patient experiences syncope and exhibits an increased PR interval and QRS duration, this implies an abnormality in the electrical conduction system of the heart. Concerning the question about what would happen to the heart rate (pulse) when there is an increased frequency between the QRS complexes: Generally, this could indicate a faster heart rate or what is known as tachycardia. However, if the PR interval is prolonged, it could be indicative of a first-degree AV block, while modifications in the QRS duration and pattern may signal various types of heart blocks or arrhythmias such as ventricular tachycardia or atrial fibrillation.
Regarding ECG interpretation, enhanced P waves can suggest atrial enlargement, an enlarged Q wave may indicate a myocardial infarction (MI), and distorted or inverted Q waves often point to ventricular enlargement. Flattened T waves may be seen where there's insufficient oxygen delivery to the myocardium, and ST segment changes can indicate an acute MI or hypoxia. These changes can have significant clinical implications, including the reduction of the heart's efficiency in pumping blood through the body, potentially leading to symptoms such as syncope.