If you are using the pin hole technique there is minimal bleeding and issue of high blood pressure would not have any adverse consequence in most cases. It would be advisable to control the blood pressure before you do implant surgery wherein you have to cut the flap and insert implant. The most common adverse effect could be excessive and rapid bleeding. You ought to take care of not losing too much blood. If the haemoglobin level of your patient is below normal; you will have to be more careful. In the event things seem to be going out of your control it is best to start I.V. drip and keep the volume of blood maintained. You may need oxygen if breathing is an issue. Usually the things come under control once the bleeding stops. You may use the normal techniques specially of pressure at the site of bleeding to control bleeding. You may call a maxillofacial surgeon or any senior surgeon to help you if need arises. Constantly monitoring the vital parameters of blood pressure, pulse, oxygenation is important.
Always use aspirating needle and aspirate before giving local anesthesia to prevent the drug going into the blood vessel directly. Use non adrenaline anesthetic solution. Keep handy all the necessary medicines and equipment/s before starting the procedure of surgery to help you deal with the situation without any stress. In most cases the surgeries are uneventful and you may not require outside help.