This study investigates safety and efficacy of the use of audiovisual consultations of emergency medical service (EMS) doctor by paramedics for low urgency events in areas covered with paramedic crews only from emergency medical service stations with distant access to hospital.

The study will be realized on Karlovy Vary EMS areas covered with paramedic crews only from emergency medical service stations with distant access to hospital. Each call on emergency line during 6 weeks study period will be assessed for eligibility. If deemed as low urgency, the event will be randomised into 3 groups. CONTROL group: routine operation of paramedic crew with optional consultation with a doctor over the phone. In the PHONE group and in the VIDEO group, there will be a mandatory consultation of a doctor over the phone or by audiovisual constultation, respectively. The primary outcome of the study is the percent of patients treated on site without the need of hospital transfer. The secondary safety outcome is to evaluate repeated ambulance trips within 48 hours after the patient had been treated at home. Moreover, a qualitative analysis of subjective perception of the event by the patients, paramedic and consulting doctor using the Likert scales will be performed by survey at the end or immediately after the event.

Each call on emergency line (in action radius of actual position of 11 of 19 Karlovy Vary EMS paramedic crews) will be assessed for eligibility by EMS call-taker in Karlovy Vary region.

Inclusion criteria are:

1. the call is evaluated as low urgency event (by criteria of Karlovy Vary EMS call-taker manual; the event is dedicated for paramedic crew only, without dispatchig doctor on site),
2. the case is determined for and will be served by one of 11 for study dedicated of total 19 paramedic crews in Karlovy Vary EMS,
3. dedicated doctor of Karlovy Vary EMS will be available for consultation during his shift.

Exclusion criteria are:

1. need for escalation of the care: paramedics' requirement for the doctor to arrive at the scene of intervention,
2. consulting doctor is not available for the study at the moment of randomisation,
3. consultation with other than trained and for study dedicated doctors,
4. patient - crew language barrier,
5. study refusal by the patient or legal representative, or refusal of audiovisual consultation,
6. technical, logistic or other (agressive patient, patient detained by police) problems evaluated by paramedic crew (not to conduct a study in PHONE and especially VIDEO group)