Phase II As part of their standard of care, all stroke patients at CSMC undergo a swallowing screen by the nursing staff at bedside. If a patient fails the bedside screen, a referral is made to the physician for a clinical swallowing evaluation by a swallowing therapist. If the patient fails the clinical swallowing evaluation, the referral is made to the physician for an instrumental swallowing evaluation which is often the videofluoroscopy swallowing study. At bedside, the electronic stethoscope will be used to monitor the patients' pharyngeal acoustic signals while they undergo swallowing evaluations monitored by members of the research team.