Está dando erro e não salva ao enviar pelo Postman

ReferenceError: atendimento is not defined at Atendimento.adiciona (C:\Users\Pedro\Desktop\aluranodesql\models\atendimentos.js:7:28) at C:\Users\Pedro\Desktop\aluranodesql\controllers\atendimentos.js:9:21 at Layer.handle [as handle_request] (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\layer.js:95:5) at next (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\route.js:137:13) at Route.dispatch (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\route.js:112:3) at Layer.handle [as handle_request] (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\layer.js:95:5) at C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\index.js:281:22 at Function.process_params (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\index.js:335:12) at next (C:\Users\Pedro\Desktop\aluranodesql\node_modules\express\lib\router\index.js:275:10) at C:\Users\Pedro\Desktop\aluranodesql\node_modules\body-parser\lib\read.js:130:5

O meu código :

const conexao = require('../infraestrutura/conexao')

class Atendimento{
    adiciona(Atendimento){
        const sql = 'INSERT INTO Atendimentos SET ?'

        conexao.query(sql, atendimento, (erro, resultados) =>{
            if(erro){
                console.log(erro)
            }
            else{
                console.log(resultados)
            }
        })
    }
}
module.exports = new Atendimento