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Effect of Ambulance Availability on Emergency Response Time in Nigerian Public Hospitals

Abstract

Timely emergency response is a critical component of effective healthcare delivery because delays in transporting patients with acute and life-threatening conditions to appropriate healthcare facilities may increase the risk of complications, disability, and death. Ambulance services provide an essential link between patients requiring emergency care and healthcare facilities capable of providing appropriate treatment. Ambulance availability refers to the presence, operational readiness, accessibility, and adequacy of ambulances for responding to emergency calls and transporting patients when required. Emergency response time refers to the period between the receipt of an emergency request and the arrival of the ambulance at the location of the emergency, as well as the time required to transport the patient to an appropriate healthcare facility where applicable. In Nigerian public hospitals, inadequate numbers of ambulances, vehicle breakdowns, poor maintenance, fuel shortages, inadequate staffing, poor communication systems, and geographical barriers may limit the availability and operational readiness of emergency transportation services. These challenges may contribute to prolonged emergency response times and delay access to appropriate medical care. Conversely, adequate and operationally ready ambulance services may facilitate faster emergency transportation, improve coordination between emergency callers and healthcare facilities, and strengthen timely access to emergency care. Against this background, this study investigates the effect of ambulance availability on emergency response time in Nigerian public hospitals. The study is anchored on Donabedian's Structure-Process-Outcome Model, the Three Delays Model, and Systems Theory. Donabedian's Model identifies ambulance availability as an important structural component of emergency healthcare delivery that can influence service processes and patient outcomes. The Three Delays Model provides a framework for understanding delays in seeking care, reaching an appropriate healthcare facility, and receiving appropriate treatment, with ambulance availability directly relevant to the process of reaching emergency care. Systems Theory views emergency healthcare delivery as an interconnected system involving emergency communication, ambulance dispatch, transportation, healthcare facilities, healthcare personnel, and clinical services, where weaknesses in one component may affect overall response performance. Collectively, these theoretical perspectives provide a suitable framework for explaining how ambulance availability may influence emergency response time in Nigerian public hospitals. The study will adopt a quantitative cross-sectional research design. Primary data will be collected from selected Nigerian public hospitals using structured facility assessment checklists, ambulance-service questionnaires, emergency dispatch records, ambulance logs, and relevant hospital emergency records. A multistage sampling technique will be employed to select states, public hospitals, emergency units, ambulance services, emergency response personnel, and relevant emergency cases. Ambulance availability will be assessed using indicators such as number of ambulances assigned to the hospital, number of functional ambulances, operational readiness, availability of drivers and emergency medical personnel, frequency of ambulance breakdowns, maintenance status, fuel availability, availability of communication and tracking systems, ambulance operating hours, and proportion of emergency requests successfully served. Emergency response time will be measured objectively using records of emergency calls, dispatch times, ambulance departure times, arrival times at emergency locations, and arrival times at receiving hospitals where applicable. Additional information will be collected on emergency distance, road conditions, traffic conditions, time of emergency request, emergency type, and availability of alternative emergency transportation. Descriptive statistics will be used to summarize ambulance availability, emergency service characteristics, and response-time patterns. Inferential statistical techniques, including chi-square tests, correlation analysis, and multiple regression analysis, will be used to determine the effect of ambulance availability on emergency response time. Diagnostic tests will also be conducted to assess the reliability of research instruments, model assumptions, goodness of fit, multicollinearity, and robustness of the findings. The study is expected to find that greater ambulance availability has a significant negative effect on emergency response time, indicating that increased availability of functional and operationally ready ambulances is expected to reduce the time required to respond to emergencies. Public hospitals with a greater number of functional ambulances, adequate emergency personnel, reliable communication systems, and effective maintenance arrangements are expected to demonstrate shorter response times than hospitals experiencing ambulance shortages or frequent vehicle breakdowns. Operational readiness is expected to be particularly important because the mere presence of an ambulance may not guarantee timely emergency response if the vehicle is unavailable, poorly maintained, without fuel, or lacks appropriate personnel. Improved ambulance availability is also expected to reduce delays in accessing emergency medical care and strengthen the ability of public hospitals to respond to multiple emergencies occurring within the same period. Conversely, inadequate ambulance availability may result in delayed dispatch, reliance on private or informal transportation, prolonged patient transfer times, and increased risk of adverse emergency outcomes. However, ambulance availability alone may not fully determine emergency response time because geographical distance, road conditions, traffic congestion, emergency call systems, dispatch efficiency, staffing, and communication infrastructure may also affect response performance. The study is expected to contribute to the literature on ambulance services, emergency response, emergency medical transportation, public hospitals, healthcare access, health-system performance, emergency healthcare management, and public health in Nigeria by providing empirical evidence on the relationship between ambulance availability and emergency response efficiency. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, state ministries of health, hospital management boards, emergency medical service managers, public hospitals, emergency departments, ambulance service providers, healthcare professionals, development partners, and policymakers regarding strategies for strengthening emergency transportation systems. The study will also provide evidence-based recommendations for increasing the availability of functional ambulances, strengthening preventive maintenance, improving fuel and operational support, ensuring adequate ambulance staffing, strengthening emergency communication and dispatch systems, implementing ambulance tracking mechanisms, improving coordination between ambulance services and hospitals, and establishing effective monitoring systems for emergency response times in Nigerian public hospitals.

Keywords: Ambulance availability, emergency response time, Nigerian public hospitals, emergency medical services, ambulance services, emergency healthcare, emergency transportation, response time, healthcare access, public health, hospital emergency services, health-system performance.