she said that she felt like her heart was "beating out of her chest." /a rapid heart rate/her heart rate was 160 beats per minute (bpm)./ her heart rate got as high as 178 bpm; headache; dizziness; tiredness; This is a spontaneous report from a non-contactable consumer or other non hcp (parent). A 16-years-old female patient received bnt162b2 (Pfizer-BioNTech COVID-19 Vaccine, solution for injection), dose 1 via an unspecified route of administration on 05Aug2021 (age at vaccination: 16-years-old) (Batch/Lot number was not reported) as DOSE 1, SINGLE for covid-19 immunization. The patient medical and concomitant medications were not reported. Reporter (parent) stated her daughter received the first dose of Comirnaty on 05Aug2021, and one week after receiving her first dose of Comirnaty, complained of a bad headache, dizziness, and tiredness, on 12Aug2021 she came down for breakfast and she said that she felt like her heart was "beating out of her chest." Reporter stated she contacted the doctor but did not get a return call, stated on 13Aug2021 her daughter again complained of a rapid heart rate, stated she checked her daughter's heart rate with a pulse oximeter and it showed her heart rate was 160 beats per minute (bpm). Reporter also states she called EMS who then came to the house, her daughter's heart rate was 145 bpm upon EMS arrival. EMS transported her daughter to the hospital. On EMS arrival her heart rate was "normal." Blood work and EKG were also "normal." Reporter stated that her daughter was released from the hospital with instructions for a Holter Monitor. Caller stated she also reached out to her daughter's pediatrician who recommended some other follow up tests. Reporter also stated she was concerned because now her daughter was back in the Emergency Room because her heart rate got as high as 178 bpm, and she had gotten no definitive information regarding Holter Monitor results or diagnosis, stated she had called the pediatrician to ask if her daughter should receive the second dose of Comirnaty, but had not yet head back from her. Reporter was asking if her daughter can safely get the second dose of Comirnaty since it is scheduled for tomorrow, 02Sep2021. The reporter was informed that: As noted in the Fact Sheet for Recipients, you should not get the Pfizer-BioNTech COVID-19 Vaccine if you had a severe allergic reaction after a previous dose of the vaccine or if you had a severe allergic reaction to any ingredient of the vaccine. The decision to receive the second dose for any other reason cannot be made by Pfizer. We refer you to speak to your healthcare provider about the risks of the vaccine compared to the risks of potentially not being fully protected against COVID-19 infection. Your healthcare provider knows your health situation and has access to information that can better help inform this decision and also as per the CDC, the second dose of Pfizer-BioNTech vaccine should be administered as close to the recommended interval as possible, but not earlier than recommended (21 days). But if it is not possible to give the second dose at 3-weeks and a delay cannot be avoided, it may be given up to 6 weeks (42 days) after the first dose. The patient underwent lab tests and procedures which included blood work and EKG: normal, Heart rate with a pulse oximeter: 160 bpm, 145 bpm, normal and 178 bpm on an unspecified date in 2021. The event heart rate increased resulted in emergency room visit. The outcome of the events was unknown.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.